A comparison of magnetic character and alteration in three granite drill cores from eastern Canada

1988 ◽  
Vol 25 (8) ◽  
pp. 1141-1150 ◽  
Author(s):  
K. L. Harding ◽  
W. A. Morris ◽  
S. J. Balch ◽  
P. Lapointe ◽  
A. G. Latham
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
The South ◽  
Eastern Canada ◽  
General Observation ◽  
South Mountain Batholith ◽  
Magnetite Content ◽  
Bulk Magnetic Susceptibility ◽  
Primary Oxidation ◽  
Drill Cores

Bulk magnetic susceptibility (BMS) measurements have been made on granite drill cores from the St. George batholith (New Brunswick), the South Mountain batholith (Nova Scotia), and the Wedgeport pluton (Nova Scotia). The primary magnetite concentrations of the two Nova Scotia cores are statistically indistinguishable, thus lending support to the hypothesis that the Wedgeport pluton, despite being 50 Ma younger, is a satellite of the South Mountain batholith.The St. George core has a primary magnetite concentration over 30 times greater than the Nova Scotia cores, but low-temperature alteration (attributable to subsurface weathering) has greatly reduced its magnetite content. The two Nova Scotia S-type granites are shown to fall into the ilmenite-series category, whereas the St. George granite, which is either S- or A-type, is transitional between the magnetite and ilmenite series.The general observation of intergranular hematite and reduced BMS in the outcrops of some granites is suggested to have important consequences for primary oxidation studies and aeromagnetic interpretation.

Syn-Acadian emplacement model for the South Mountain batholith, Meguma Terrane, Nova Scotia: Magnetic fabric and structural analyses

1997 ◽  
Vol 109 (10) ◽  
pp. 1279-1293 ◽  
Author(s):  
Keith Benn ◽  
Richard J. Horne ◽  
Daniel J. Kontak ◽  
Geoffrey S. Pignotta ◽  
Neil G. Evans
Keyword(s):  
Nova Scotia ◽  
Magnetic Fabric ◽  
The South ◽  
South Mountain Batholith ◽  
Meguma Terrane

Oxygen isotope evidence for the genesis of Upper Paleozoic granitoids from southwestern Nova Scotia

1980 ◽  
Vol 17 (1) ◽  
pp. 132-141 ◽  
Author(s):  
F. J. Longstaffe ◽  
T. E. Smith ◽  
K. Muehlenbachs
Keyword(s):  
Nova Scotia ◽  
Oxygen Isotope ◽  
Large Scale ◽  
The South ◽  
Metasedimentary Rocks ◽  
South Mountain Batholith ◽  
Oxygen Isotope Ratios ◽  
Upper Paleozoic ◽  
Isotope Evidence ◽  
Alteration Processes

The oxygen isotope ratios for 127 rocks and coexisting minerals from Paleozoic granitoids and clastic metasedimentary rocks of southwestern Nova Scotia have been measured. The whole-rock δ18O values for samples of the South Mountain batholith range from 10.1–12.0‰.But discrete granitoid plutons, located to the south of the South Mountain batholith, have lower δ18O values (7.8–10.4‰). Coexisting minerals from the Nova Scotia granitoids are near isotopic equilibrium, indicating that the whole-rock δ18O values primarily reflect the δ18O of the magma, rather than secondary alteration processes. The Meguma Group clastic metasedimentary rocks that host the Nova Scotia granitoids range in δ18O from 10.1–12.9‰. These clastic metasedimentary rocks show no systematic geographic variation in δ18O. The greenschist facies Meguma Group rocks that host the South Mountain batholith have similar δ18O values to the amphibolite facies equivalents located about the southern discrete plutons. Large scale isotopic exchange between the Meguma Group and the South Mountain batholith, or the southern plutons, is not evident.The relatively high δ18O values of the peraluminous South Mountain batholith (10.1–12.0‰) indicate that it formed by anatexis of 18O-rich clastic metasedimentary rocks. The southern plutons were also derived by partial melting of clastic metasedimentary rocks, but their lower δ18O values reflect exchange of the source material with a low 18O reservoir (mafic magmas?) prior to, or during anatexis.The sheared Brenton pluton is much lower in δ18O (5.0‰) than any of the other rocks, probably because of exchange with low 18O fluids during shearing.

Occurrence and significance of Silurian K-bentonite beds at Arisaig, Nova Scotia, eastern Canada

1997 ◽  
Vol 34 (12) ◽  
pp. 1630-1643 ◽  
Author(s):  
Stig M. Bergström ◽  
Warren D. Huff ◽  
Dennis R. Kolata ◽  
Michael J. Melchin
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Geochemical Data ◽  
Northern Coast ◽  
Calc Alkaline ◽  
The South ◽  
Eastern Canada ◽  
Critical Information ◽  
Plate Margin ◽  
Alkaline Magmas

The most extensive succession of K-bentonite beds known in the Silurian of North America occurs at Arisaig on the northern coast of Nova Scotia. At least 40 ash beds are present in the Llandoverian Ross Brook Formation and at least four in the early Ludlovian McAdam Brook Formation. Most of the beds are thin (< 5 cm), but one bed (the Smith Brook K-bentonite bed) in the late Llandoverian crenulata Zone and another (the McAdam Brook K-bentonite bed) in the early Ludlovian nilssoni Zone each reach a thickness of 20 cm. New graptolite collections provide critical information on the biostratigraphic position of the K-bentonite beds in the Ross Brook Formation. Geochemical data show that the Arisaig ash beds represent calc-alkaline magmas from plate margin, subduction-related volcanic vents. Differences in K-bentonite stratigraphic distribution, combined with paleogeographic considerations, suggest that the volcanoes were located much farther to the south in the Iapetus than the source volcanoes of the British–Baltoscandian Llandoverian K-bentonites.

Magmatic andalusite from the South Mountain batholith, Nova Scotia

1976 ◽  
Vol 56 (3) ◽  
pp. 279-287 ◽  
Author(s):  
D. B. Clarke ◽  
C. B. McKenzie ◽  
G. K. Muecke ◽  
S. W. Richardson
Keyword(s):  
Nova Scotia ◽  
The South ◽  
South Mountain Batholith

IMPLICATIONS OF ZIRCON PETROCHRONOLOGY OF THE SOUTH MOUNTAIN BATHOLITH (NOVA SCOTIA) FOR SN-W METALLOGENY

2020 ◽  
Author(s):  
Luke Bickerton ◽  
◽  
Daniel J. Kontak ◽  
Iain M. Samson ◽  
J. Brendan Murphy ◽  
...  
Keyword(s):  
Nova Scotia ◽  
The South ◽  
South Mountain Batholith

The Food of Salmon Fry in Eastern Canada

1936 ◽  
Vol 2 (5) ◽  
pp. 499-506 ◽  
Author(s):  
H. C. White
Keyword(s):  
Nova Scotia ◽  
New Brunswick ◽  
Late Summer ◽  
Considerable Proportion ◽  
Eastern Canada ◽  
Chironomid Larvae ◽  
Growing Period ◽  
Cumberland County ◽  
Major Food ◽  
Salmon Fry

Stomach analyses were made of young salmon in their first summer, as obtained from West and East Apple rivers, and Reeds and Eatonville creeks, all in Cumberland county, Nova Scotia, and from Digdeguash river in New Brunswick. Chironomid larvae formed the chief food of the newly emerged fry, while ephemerid nymphs constituted the major food taken during the mid-summer growing period. Trichoptera tended to become important toward autumn, but at times formed a considerable proportion of the food even in July and August. Plecoptera, simuliids and tipulids also occurred, and terrestrial forms such as Hymenoptera, Homoptera and Diptera were taken in appreciable quantities in late summer and autumn.

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