scholarly journals The role of fluids in the late-stage evolution of the South Mountain Batholith, Nova Scotia: further geochemical and oxygen isotopic studies

10.4138/1718 ◽  
1991 ◽  
Vol 27 (1) ◽  
Author(s):  
Daniel J. Kontak ◽  
Robert Kerrich ◽  
David F. Strong
Keyword(s):  
Nova Scotia ◽  
Late Stage ◽  
The South ◽  
South Mountain Batholith ◽  
Isotopic Studies ◽  
Oxygen Isotopic

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.

Strontium isotope geology of the South Mountain batholith, Nova Scotia

1980 ◽  
Vol 44 (8) ◽  
pp. 1045-1058 ◽  
Author(s):  
D.B. Clarke ◽  
A.N. Halliday
Keyword(s):  
Nova Scotia ◽  
Strontium Isotope ◽  
The South ◽  
South Mountain Batholith

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

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.

TRACING GARNET ORIGINS IN GRANITOID ROCKS BY OXYGEN ISOTOPE ANALYSIS: EXAMPLES FROM THE SOUTH MOUNTAIN BATHOLITH, NOVA SCOTIA

2011 ◽  
Vol 49 (2) ◽  
pp. 417-439 ◽  
Author(s):  
J. S. Lackey ◽  
S. Erdmann ◽  
J. S. Hark ◽  
R. M. Nowak ◽  
K. E. Murray ◽  
...  
Keyword(s):  
Nova Scotia ◽  
Oxygen Isotope ◽  
Isotope Analysis ◽  
The South ◽  
South Mountain Batholith ◽  
Granitoid Rocks

Chemical variation in Al2O3–CaO–Na2O–K2O space: controls on the peraluminosity of the South Mountain Batholith

2004 ◽  
Vol 41 (7) ◽  
pp. 785-798 ◽  
Author(s):  
D Barrie Clarke ◽  
Michael A MacDonald ◽  
Saskia Erdmann
Keyword(s):  
Nova Scotia ◽  
Chemical Evolution ◽  
Wall Rock ◽  
Aqueous Fluid ◽  
Isotopic Ratios ◽  
Chemical Variation ◽  
The South ◽  
South Mountain Batholith ◽  
Upper Limit ◽  
Granitic Batholith

The South Mountain Batholith (SMB) of southwestern Nova Scotia is a large, highly differentiated, peraluminous, granitic batholith in which the average A/CNK (mol Al2O3/mol(CaO + Na2O + K2O)) increases from 1.16 to 1.23 with chemical evolution. We use vector analysis of variations solely in Al2O3–(CaO + Na2O + K2O) space to assess the fractionation, assimilation, fluid, and source controls on the peraluminosity of the SMB. With increasing chemical evolution, Al2O3 decreases, CaO decreases sharply, Na2O is approximately constant, and K2O increases in the early and middle stages but decreases in the most evolved stage. Initial 87Sr/86Sr and 143Nd/144Nd isotopic ratios for granites and average Meguma Supergroup country rocks suggest an upper limit of ~33% of wall-rock contamination for the most evolved rocks, if the most primitive rocks are uncontaminated. The trend of chemical evolution of the SMB through Al2O3–(CaO + Na2O + K2O) space is the resultant of all input vectors (processes). In the early stages, those processes are fractional crystallization of plagioclase ± K-feldspar ± cordierite ± biotite and contamination by country rocks. In the later stages, those processes are fractionation of plagioclase ± K-feldspar ± andalusite ± muscovite, further contamination by country rocks, and selective partitioning of Ca–Na–K into aqueous fluid phases. Clear geochemical evidence for variation in the source composition is lacking.

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