Undergraduate Research

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1988 Queen Charlotte Basin Experiment: Seismic refraction and gravity models of line 3
(University of New Brunswick, 1994) Long, Denise Thérèse; Spence, George
The Queen Charlotte Basin is situated off Canada's west coast. It lies between the mainland, a large plate-boundary transform fault, a triple-junction and a subduction zone. In 1988, a large seismic refraction and wide-angle reflection survey was carried out in order to study the basin's structure and evolution. Line 3 of that survey is the focus of this thesis. The velocity model of line 3 was obtained using refraction data from three land-based receivers. The initial sediment thickness and velocity was determined by the reflection section of line 3 and Harlequin Well data. Results show that the upper crust velocities increase from 5.5 km/s to 6.3 km/s at 8 km. Velocities increase in the mid crust from 6.5km/s to 6.7 km/s at 18 km depth. In the lower crust, a velocity of 6.8-6.9 km/s was found with Moho depths ranging from 26-28 km. These velocities correspond well with the results found in the southern sound, and the depth of the Moho is similar to that found in the Hecate Strait. The present Moho depth of line 3 shows that the northern Queen Charlotte Sound is only 80% of the original crustal thickness, strongly indicating an extensional history in the area. The gravity model defined a transition from oceanic to continental crust over a horizontal distance of 75 km (+/- I 0 km) corresponding with a Moho dip of 14 degrees.
A case history of the discovery and geophysical and geochemical signatures of the Burnt Pond sulphide prospect Noel Paul's Brook Area Central Newfoundland NTS 12 A/9
(University of New Brunswick, 1986) Dimmell, Peter M.
The Burnt Pond prospect is one of six known sulphide deposits in the Victoria Lake Group of the Central Mobile Belt of Newfoundland, the others being the Tally Pond (Boundary) deposit, the Tulks Hill and Tulks East deposits, the Victoria Mine and the Jacks Pond deposit. The Burnt Pond prospect was discovered in 1974 by Noranda Exploration Company, Limited during follow - up of a stream sediment geochemical anomaly in a small brook flowing into the southeast side of Burnt Pond. The subeconomic sulphide mineralization consists of disseminated and fracture filling pyrite, sphalerite, galena and chalcopyrite hosted by the upper part of a pyroclastic felsic volcanic unit, and thin banded massive sulphides near the contact between the overlying sedimentary sequence and the felsic volcanics. This mineralization is thought to be associated with hydrothermal activity during the waning stages of island arc volcanism. Pervasive quartz-chlorite – talc alteration and sericitization accompanies the mineralization. The deposit has no discrete geophysical expression. The contact with the sedimentary units which overlie it is marked by a narrow graphitic shale unit which can be mapped geophysically by airborne and ground electromagnetic methods. Copper, lead, zinc and silver in soils show a strong anomalous zone over the mineralized area. The discovery of this deposit and the recognition of the thick volcanic sequence hosting it led to further work along strike in the Tally Pond area, 15 km to the southwest, which culminated in the discovery of the Tally Pond (Boundary) deposit in 1981.
A magnetic susceptibility investigation of the Manicouagan impact structure
(University of New Brunswick, 2018) Hopkins, Randy G.; Spray, John; Butler, Karl
The study of terrestrial impact craters provides significant insight as to how hypervelocity asteroid collisions have affected the Earth and other planetary bodies over geologic time. There is still much to learn about the redistribution of material and readjustment of the Earth's crust following an impact event. This study was performed to gain insight of the distribution of magnetic mineral phases within the melt sheet rock as well as study the melt sheet-basement rock interface at the Manicouagan impact structure in northern Quebec. The magnetic susceptibility of two drill cores with a combined length of over 3 km was logged using a KT-10 magnetic susceptibility meter. Magnetic mineral phases within the impact melt sheet were analyzed using Raman Spectrometry. The magnetic susceptibility was found to vary from as high as 577x10-3 SI in basement rocks to as low as 0.01x10-3 SI in the melt sheet. Magnetite was found to be the dominant iron oxide mineral phase within all sections of the melt sheet, except in the upper 190 m of MAN-0608, in which no magnetite was found, and hematite was the dominant iron oxide phase. Offset patterns in the magnetic susceptibility logs of the MAN-0501 and MAN-0608 drill cores of the impact melt sheet suggest that MAN-0501 may have been up-faulted 160 m after the solidification of the impact melt sheet.
A microstructural study of Penrhyn Slate, of North Wales
(University of New Brunswick, 1983) Davidson, James L.
Optical microscopy of three orthogonal ultrathin petrographic sections, 5 to 10 μm, in conjunction with scanning electron microscopy (SEM ) were used in a microstructural analysis of the Penrhyn slates of North Wales. The cleavage domains of these slates are found to be more penetrative than the lenticular domains. Aspect ratios of quartz measured in the X-Z and Y-Z sections are found to be 2.5 and 1.8 respectively. A possible quartz c-axis fabric is observed. Assuming the fabric is not an artifact of measuring it represents extension in the Y direction which is characteristic of doubly plunging folds. Micas of the chlorite mica stacks which have formed kink band boundaries between the portion in the stack and the portion in the cleavage will recrystallize forming two discrete micas. Chlorite has grown in extension sites produced in the splitting of micas in the chlorite-mica stacks. Serrated kink band boundaries are developed in the chlorite of some chlorite stacks. Fluid-enhanced intergranular diffusional mechanisms are most likely responsible for the intimate intergrowths of quartz and mica. Quartz mica intergrowths, mica beards, are developed in a direction grossly parallel to the X axis of the finite strain ellipsoid. The aspect ratios of quartz and the symmetry of the mica beards indicate the orthorhombic symmetry of the finite strain ellipsoid.
A petrographic study of samples from cassiterite bearing localities in Central New Brunswick, Fontao, Spain and Echassieres, France
(University of New Brunswick, 1984) Susak, N.
The cassiterite deposits of Central New Brunswick, Fontao Spain, and Echassieres France have been studied petrographically. Comparison of these deposits with those in Cornwall, South West England and Thailand indicated that the Sulpetro, Rocky Brook Main, some parts of Dungarvon, Falls Brook, Todd Mountain, and Burnthill deposits are similar to the Cornwall type deposits. Tin Hill, some parts of Dungarvon, and Fontao deposits are similar to the Thailand deposits. Temperature information, based on cassiterite crystal habit, indicated a range from 600°C to 450°C for the depositional temperature of the cassiterite. Depth of emplacement and lithostatic pressures, based on Strong's (1981) classification of tin deposits, indicated a range from 12,000 to 2,000 meters and from 3.5 to 0.5 kilobars respectively. The activities of K20 and Na20, based on the stability relations in the K20-Na20-A1203-Si02 -H20-HCl system, are highest in the potassium feldspar rich veins of Salpetro and Rocky Brook Main. They were lowest for the muscovite rich samples from Fontao, Tin Hill greisen, and Cleveland greisen. Because a geological report on the Central New Brunswick area indicated the possibility of a common magmatic source for the granite stocks (Irrinki, 1981), a unifying model was devised to explain the genesis of the cassiterite deposits of Central New Brunswick. The origin of each cassiterite deposit and its relation to the other cassiterite deposits in the area, could be explained using this model. From the model, it is suggested that the Cornwall type complex hydrothermal lode deposits like Sulpetro were produced by fractional crystallization of a late stage granite stock. Smaller deposits like at Rocky Brook Main, may be associated with earlier less trace element rich granite stocks
A study of anisotropic granodiorite from the 1982 Miramichi earthquake epicentre
(University of New Brunswick, 1985) O'Neill, David A.
Granodiorite samples taken from the epicentre of the 1982 Miramichi earthquake sequence reveal a parallel network of Mode I (tensile) fractures. These fractures have a marked effect on the mechanical properties of the material as determined by laboratory testing. The action of stress cycling produces a pronounced decrease in strength of the material as permanent strain is accumulated by dilatant behavior. The micro-fractures are believed to have formed in response to a stress regime whose maximum principal stress orientation is approximately horizontal, east-west trending and whose minimum principal stress is vertical.
A study of benthonic foraminifera as environmental indicators with particular reference to species of the Northumberland Strait and Buctouche Estuary, New Brunswick
(University of New Brunswick, 1976) McNally, Marian A.; Van De Poll, H.; R. Pickerill
Species of benthonic Foraminifera from the Buctouche Estuary, New Brunswick, and the Northumberland Strait in this study show facies and environmental relationships. Samples of the estuarine subfacies have particular foraminiferal composition reflected in species diversity and relative abundance. Foraminiferal assemblages analysed from the Northumberland Strait core show an environmental change from nearshore to open marine. This change is compatible with the effects of the present Holocene marine transgression.
A study of deformed alkali feldspars from a Precambrian shear zone
(University of New Brunswick, 1984) Poirier, Glenn G.
The specimens used in this study were quartzofelspathic gneisses collected from an upper amphibolite facies shear zone in the Ontario Gneiss Segment of the Grenville Province and were studied using optical, X-ray and EDS/SEM techniques. Results of these studies have shown that the majority of the deformation was due to ductile deformation which produced a significant amount of plastic strain in the feldspar porphyroclasts. Observations of these deformed porphyroclasts suggest that plagioclase and microcline have been dynamically recrystallized by rotation and progressive misorientation of subgrains within the host crystals. Increased deformation was found to decrease the amount of microcline present in the specimens. Other parameters such as Al-Si ordering and composition (as determined by XRD and EDS) were found to remain fairly constant with increasing deformation.
A study of sulfides and related minerals from the O' Toole ore horizon, Fortaleza De Minas, Brazil
(University of New Brunswick, 1991) Banks, Peter G.; Spray, John
The O'Toole nickel sulfide orebody is a komatiite-associated deposit located in the Archean Morro do Ferro Greenstone sequence of the Furnas granitoid-greenstone terrain in the Minas Gerais region of Brazil . The ore zone occurs at the base of the upper ultramafic cycle, of which there are four. The ore appears to have accumulated in an embayment, possibly formed by magma-induced thermal erosion, in footwall iron-formation sediments. Four ore types are defined: banded, breccia , matrix and disseminated . The ore mineral assemblage is pyrrhotite –pentlanditechalcopyrite with minor cobaltite-gersdorffite. Oxides include ferro chromite, magnetite and minor ilmenite. Higher concentrations of chromium and cobalt occur in the upper part of the ore zone, while nickel concentrations increase toward the base. The ore has undergone extensive deformation and metamorphism to the amphibolite facies. The postulated peak metamorphic temperature was 525°C with f0 2 at 10-24 (using the solution model of Spencer and Lindsley, 1981). The ore textures are mainly tectonometamorphic, showing syn - as well as post-deformation mineral growth.
Alteration and related mineralization in the Qalluviartuuq greenstone belt, northeastern Superior Province, Quebec.
(University of New Brunswick, 1995) Still, Alastair Charles
The <2 km wide and about 70 km long Qalluviartuuq greenstone belt consists of mafic and felsic metavolcanic schists, metasediments, and a lens of gabbroic anorthosite <1 km wide and ~3-5 km long. Peak metamorphic grade for the section of the belt studied is low pressure epidote amphibolite facies with retrograde metamorphism in the upper greenschist facies. The mafic metavolcanics classify as basalts to alkaline basalts and contain hornblende - epidote - plagioclase (An33 - An40) ± biotite ± sphene ± magnetite. Quartzofeldspathic metasediments consist of quartz - biotite - plagioclase ±garnet± magnetite ± pyrite± chalcopyrite. The gabbroic anorthosite consists of plagioclase (An60 - An70) ± hornblende± clinopyroxene ± orthopyroxene ± biotite. Plutonic rocks flanking the belt are primarily biotite ± muscovite foliated metagranodiorite which trend NNW and dip steeply to near vertical. Zones of extensive alteration within the mafic metavolcanics and the anorthositic lens contain plagioclase - anthophyllite - cordierite ± biotite ± sericite ± chlorite ±quartz. Within the mafic metavolcanics these altered zones are characterized by enrichments in Fe20 3T and MgO with depletions in K20, Cao, Na20, and Si02. Altered zones of the anorthositic lens are characterized by enrichments in Fe20 3T, MgO, and Na20. These zones are associated with areas of localized ductile deformation characterized by layering of mafic minerals, mylonitization, and kink folding. They are likely brittle-initiated zones of ductile deformation which have undergone recrystallization-accommodated dislocation creep. Sulfide mineralization is associated with ductilely deformed and altered sections of the anorthositic lens and consists of pyrite - chalcopyrite - pyrrhotite ± sphalerite ±magnetite. Mineralization within mafic metavolcanics is characteristic of a Cu-Zn type volcanogenic massive sulfide (VMS) deposit and contains pyrite-pyrrhotite - chalcopyrite ± sphalerite ± magnetite± galena. Mineralized zones have elevated Cu, Zn, and Ag values with localized enrichments in Au and Co.
Alteration and related mineralization in the Qalluviartuuq greenstone belt, Northeastern Superior Province, Quebec
(University of New Brunswick, 1995) Still, Alastair Charles; Spray, John; Percival, John
The <2 km wide and about 70 km long Qalluviartuuq greenstone belt consists of mafic and felsic metavolcanic schists, metasediments, and a lens of gabbroic anorthosite <1 km wide and ~3-5 km long. Peak metamorphic grade for the section of the belt studied is low pressure epidote amphibolite facies with retrograde metamorphism in the upper greenschist facies. The mafic metavolcanics classify as basalts to alkaline basalts and contain hornblende - epidote - plagioclase (An33 - An40) ± biotite ± sphene ± magnetite. Quartzofeldspathic metasediments consist of quartz - biotite - plagioclase ±garnet± magnetite ± pyrite± chalcopyrite. The gabbroic anorthosite consists of plagioclase (An60 - An70) ± hornblende± clinopyroxene ± orthopyroxene ± biotite. Plutonic rocks flanking the belt are primarily biotite ± muscovite foliated metagranodiorite which trend NNW and dip steeply to near vertical. Zones of extensive alteration within the mafic metavolcanics and the anorthositic lens contain plagioclase - anthophyllite - cordierite ± biotite ± sericite ± chlorite ±quartz. Within the mafic metavolcanics these altered zones are characterized by enrichments in Fe20 3T and MgO with depletions in K20, Cao, Na20, and Si02. Altered zones of the anorthositic lens are characterized by enrichments in Fe20 3T, MgO, and Na20. These zones are associated with areas of localized ductile deformation characterized by layering of mafic minerals, mylonitization, and kink folding. They are likely brittle-initiated zones of ductile deformation which have undergone recrystallization-accommodated dislocation creep. Sulfide mineralization is associated with ductilely deformed and altered sections of the anorthositic lens and consists of pyrite - chalcopyrite - pyrrhotite ± sphalerite ±magnetite. Mineralization within mafic metavolcanics is characteristic of a Cu-Zn type volcanogenic massive sulfide (VMS) deposit and contains pyrite-pyrrhotite - chalcopyrite ± sphalerite ± magnetite± galena. Mineralized zones have elevated Cu, Zn, and Ag values with localized enrichments in Au and Co.
Analysis of J.D. Irving Limited plantations at Black Brook in northwestern New Brunswick
(University of New Brunswick, 1972) Corey, Donald J.
This thesis discusses the present reforestation program being carried out in the Black Brook district. of northwestern New Brunswick by J.D. Irving Limited. Planting of cut-over areas was initiated in 1951 and presently more than 25 million trees have been planted on about 25 thousand acres; black, red, and white spruce were the major species planted. Estimated costs of plantation establishment include $60 / acre for planting $17/acre- for site preparation and $7/acre for herbicide application. Average survival rat.es of 87%, five years following planting have been obtained, as well as an average growth in height of 14 inches during the seventh growing season following planting. Company predictions call for a yield of 6.0 cords per acre at the end of a short 35 year rotation. However, yields of from 30-40 cords per acre would appear to be more reasonable under present harvesting methods.
Analysis of magnetic and seismic data from the quiet magnetic zone of the northwest Atlantic
(University of New Brunswick, 1974) Ally, Liaquat A.; Burke, K.
The results of a geophysical survey within a portion of the "quiet magnetic zone" of the Northwest Atlantic indicate that the area is magnetically lineated; magnetic highs alternate with magnetic lows, but the anomalies are of small amplitude. A low intensity of total magnetisation is necessary to explain these small amplitudes. The conclusion reached in this thesis is that the "quiet magnetic zone" was formed at low paleomagnetic latitudes and that the remanent magnetisation component has a much reduced influence on the magnetic values measured in the present day direction of the geomagnetic field .
Analytical electron microscopy of shock veins from the Catherwood L6 chondrite
(University of New Brunswick, 1996) Hendry, Karen; Spray, John
The commonly accepted theory for the formation of shock veins is that they are caused by shock pressure due to a shock wave passing through the body. More recently, people have begun to think that frictional heat contributes to the formation of these veins. Evidence supporting this theory includes the shearing and displacement of grains along the veins. The sheared grains are those composed of metal and troilite as they have a lower melting temperature. The Catherwood L6 chondrite was analyzed on the JSM 6400 digital scanning electron microscope and the petrographic microscope. Over 20 examples of shearing and displacement of grains were recognized which ranged from 6 μm-0.55 mm in length. This displacement of grains indicates there has been movement along the veins which would, in turn, produce heat. This frictional movement, coupled with shock pressure, is most likely the cause of the formation of shock veins.
Application of the Al-in-hornblende geobarometer and the hornblende-plagioclase geothermometer to the St. George Batholith, in SW New Brunswick
(University of New Brunswick, 1997) Godbout, Jason
The Al-in-hornblende geobarometer and amphibole-plagioclase geothermometer have been applied to selected samples from plutons in the Saint George Batholith, located in the southwestern corner of New Brunswick. These plutons are the Magaguadavic Pluton, the Evansdale Pluton and the Bocabec Bay Pluton, all of which met the proposed criteria for application of both the geobarometer and the geothermometer. The geothermometer and geobarometer are based upon the following Al dependent exchanges in hornblende: ANa IV Al A-1 IVSi-1 (temperature dependent edenite exchange vector) VI Al IV Al VlMg-1 IVSi-1 (pressure dependent tschermaks exchange vector). The following results were obtained for average pressures (±0.6 kbar) and temperatures (±75 °C): Magaguadavic Pluton, 1.0-2.1 kbar and 645 - 676°C; Evansdale Pluton, 0.9 kbar and 648°C; Bocabec Bay Pluton, 2.3 - 2.9 kbar and 700 - 746°C. Since both temperature and pressure are calculated based on the Al content of hornblende, it is necessary to come to grips with the factor that control the composition of hornblende. A determination of the exchange vectors controlling the Al content in hornblende should be done. Doing so on the samples from this study reveals that temperatures from 5 samples in this study may be acceptable, to the best of the geothermometer's accuracy. The stoichiometries of these samples suggest that the temperature dependent edenite exchange was dominant in their crystallization history, and therefore, the amphibole-plagioclase geothermometer is applicable. The other results are not very different from previous estimates (not using the methods presented in this study), but the lack of cation exchange correlation and evidence which suggests subsolidus alteration of the Al content of hornblende are factors that raise uncertainty in the results of this study. In order to successfully apply the Al-in-hornblende geobarometer to the plutons in this study, subsolidus changes in the Al-content of hornblende need to be investigated and the calibration of the geobarometer should be extended to low pressures (0 - 2.5 kbar) This should also include improvement in the precision of the barometer, something which may not be possible with the present thermodynamic data base on hornblende.
Borings not boring: Trypanites lcbnofacies from the Bay of Fundy, Nova Scotia
(University of New Brunswick, 2003) Boulter, Luke S.; Gingras, Murray; Pickerill, Ron
Cobequid Bay represents the easternmost arm of the Bay of Fundy and suffers the most extreme tidal range in the Fundy system (up to 17m). Consequently, the intertidal zone is wide and unusually high (tidal) energy deposits are commonly exposed. A remarkable bored surface (Trypanites Ichnofacies) is present on the north margin of Cobequid Bay (Thomas' Cove) near Economy, Nova Scotia. The surface is the result of tidal ravinement and the subsequent colonization by boring and encrusting organisms. The borings are exclusively the work of the boring bivalves Petricola pholadiformis Lamarck and Zirfaea pilsbryi Lowe. Encrusting organisms include barnacles, mussels, kelp, algae, bryozoans, foraminifers, rare sponges and anemones. There are also several squatters present, such as amphipods, gastropods, various worms, and two other species of bivalve. Although the distribution of borings is patchy, the population density is highest in or near pools of standing water and at the bottom of rock-floored tidal channels. The largest continuously bored zone is 300m by 80m. Smaller patches are also common.Boring density locally exceeds 1250 borings per square meter, which suggests that Petricola and Zirfaea can be agents of extreme bioerosion in the area. Finally, animal relationships, discerned colonization patterns, and simple taphonomy show that the largest surface represents approximately 40 years of colonization; at least 15cm of erosion into the bedrock has occurred over this time span,and standing or flowing water is necessary for the activities of the animals. All of the above show that archetypal Trypanites surfaces probably represent dynamic biomes that have a discernible temporal significance and can be linked to sedimentary processes and, to a lesser degree, bathymetry.
Bromine, chlorine, potassium and sodium content of the Sussex Potash deposit, Kings County, New Brunswick
(University of New Brunswick, 1975) Boudreau, Bernard P.; Van De Poll, H.
Twenty-six samples of core from two drill holes from the Sussex Potash occurrence, Kings County, New Brunswick, were analysed for bromine, chlorine, potassium and sodium. The overall low bromine content of these samples indicates that the potash minerals are of secondary origin and probably formed by solution and recrystallization by aqueous fluids. The upward increase of bromine concentration within individual zones suggests that the solutions responsible for this alteration moved upward through the deposit.
Chemostratigraphy of neoproterozoic carbonate units in the Northern Selwyn Basin, Yukon
(University of New Brunswick, 2015) Padget, Colin; Keighley, Dave; Moynihan, David
The correlation of Selwyn basin stratigraphy with platformal sequences of the upper Windermere Supergroup has been a topic of study for many decades. The strata of the Windermere Supergroup are thought to represent a Neoproterozoic transition to passive margin sedimentation from an active rift system. The oldest strata of the Selwyn basin, the Hyland Group, are the initial product of this pericratonic passive margin sedimentation. Recent mapping at the eastern extent of the Dawson fault zone at the northern boundary of the Selwyn basin indicates equivalence of the Algae and Narchilla formations (Hyland Group – Selwyn basin) with the Risky and Ingta formations (‘upper group’ – Windermere Supergroup). To further substantiate this equivalence two Hyland Group carbonate markers in the Selwyn basin have been compared with well-studied strata of the Windermere Supergroup from north of the Dawson fault. Specifically, through detailed comparison of sedimentological, chemostratigraphic, and petrographic characteristics, this study aims to correlate the upper carbonate marker (Algae Formation) and the lower carbonate marker (part of the Yusezyu Formation) with the Risky Formation and Gametrail Formation of the Windermere Supergroup, respectively. The Gametrail Formation displays a distinct isotopic signature suggestive of the ~580 Ma Shuram/Wonoka anomaly and thus confirming these stratigraphic relationships across the Dawson fault would begin to suggest the deposition of the Hyland Group stratigraphy along with final rifting of the NW Laurentian margin occurred during the late Ediacaran.
Constraints on the metamorphic evolution of the Fraser Range, Western Australia
(University of New Brunswick, 1989) Bovaird, Christine A.
A speculated collision between the Archaean Yilgarn Block and the Proterozoic Fraser Range is thought to have resulted in the formation of the Proterozoic Fraser Range Mobile Belt of Western Australia. Attempts at determining constraints on the metamorphic evolution of the mobil belt comprise geothermometric, geobarometric and compositional determinations combined with detailed petrographic analysis. A geological history for the Fraser Range Mobile Belt is proposed based upon the correlation of each of the above analytical methods. Proterozoic granulite facies rocks derived from remixed Archaean rocks were formed during the Proterozoic collision of the Yilgarn Block and the Fraser Range. Subsequent uplift and erosion resulted in a retrogression event as evidenced by relict granulite facies assemblages located at surface on the eastern flank of the Mobile Belt. Following a trend east to west across the Mobile Belt, lower grade mineral assemblages are noted with a corresponding decrease in pressure and temperature estimates. These estimates reflect post granulite facies crystallization of lower grade mineral phases as a result of retrogression.
Contact mapping and modelling using magnetics, Heath Steele Mine Area northern New Brunswick
(University of New Brunswick, 1992) McDonald, Sean
1992 In this project, total field, gradient and magnetic susceptibility measurements were found to be useful tools in delineating contacts between magnetic and non-magnetic bodies in areas of little or no exposure, just to the north of the Heath Steele Mine site in northern New Brunswick. The most striking magnetic anomaly was found to be associated with a gabbro intrusion. This body has a large magnetic susceptibility in comparison to its surrounding rocks. This property makes the intrusion easily visible on magnetic profiles and contoured gradient maps. The gabbro is displaced sinistrally by two NW-SE trending faults. Modelling of an anomalous zone in the gabbro required a vertically sided body, with a higher magnetization than indicated by determinations from in-situ magnetic susceptibility measurements, suggesting remnant magnetization may be of significance in the area.

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