Layered Granitic Rocks at Chebucto Head, Halifax County, Nova Scotia

1975 ◽  
Vol 12 (3) ◽  
pp. 456-463 ◽  
Author(s):  
T. E. Smith
Keyword(s):  
Grain Size ◽  
Nova Scotia ◽  
Granitic Rocks ◽  
Textural Characteristics ◽  
Rock Types ◽  
Flow Sorting

Structural, mineralogical and textural characteristics of some layered granitic rocks are described. The layers result from the segregation of minerals into bands and lenses of contrasting color and grain size. They were formed near the roof of the pluton prior to final crystallization by flow sorting during episodic shearing generated during intrusion. Comparison of the mineralogy and textures of the layered rocks with those of the main rock types of the pluton shows that the differentiation of the pluton as a whole took place after the formation of the layers by interaction of felsic components concentrated in residual liquids with earlier formed crystals.

PRELIMINARY AGE STUDY AND INITIAL Sr87/Sr86 OF NOVA SCOTIA GRANITIC ROCKS BY THE Rb-Sr WHOLE-ROCK METHOD

1964 ◽  
Vol 75 (3) ◽  
pp. 253 ◽  
Author(s):  
H. W. FAIRBAIRN ◽  
P. M. HURLEY ◽  
W. H. PINSON
Keyword(s):  
Nova Scotia ◽  
Granitic Rocks

La viabilité des bétons du Québec: le rôle des granulats

1986 ◽  
Vol 13 (1) ◽  
pp. 12-24 ◽  
Author(s):  
Jean Bérard ◽  
Richard Roux
Keyword(s):  
Key Words ◽  
Silica Gel ◽  
Cement Paste ◽  
Chemical Reactions ◽  
Mechanical Deformation ◽  
Granitic Rocks ◽  
Concrete Aggregate ◽  
Coarse Aggregates ◽  
Rock Types ◽  
Petrographic Study

The petrographic study of numerous concrete structures in Quebec has revealed the extent of postconstruction chemical reactions. Those reactions between the aggregates, which form 70% of the volume of the concrete, and the cement paste result in early deterioration and undesirable mechanical deformation of the structures. From this study, it appears that the coarse aggregates can react in three different ways: (a) by peripheral reaction, which is the case for massive granitic rocks, (b) by bulk swelling, as illustrated by the Potsdam orthoquartzite, and (c) by formation of silica gel veinules within the aggregate, as shown by some Trenton limestone. Considering these three mechanisms, it is easy to understand why certain aggregates react rapidly, that is within a few months, whereas others show signs of distress only after scores of years. Using the three rock types cited above, we have also tried to evaluate existing concrete standards and their capability to detect the most important pathologies encountered in concrete. Key words: concrete, aggregate, alkalis, disintegration, expansion, testing, durability.

Geochemistry of the tonalitic and granitic rocks of the Nova Scotia southern plutons

1977 ◽  
Vol 41 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Carlos A.R de Albuquerque
Keyword(s):  
Nova Scotia ◽  
Granitic Rocks

The oxygen isotope composition of the surface crystalline rocks of the Canadian Shield

1978 ◽  
Vol 15 (11) ◽  
pp. 1773-1782 ◽  
Author(s):  
Yuch-Ning Shieh ◽  
Henry P. Schwarcz
Keyword(s):  
Isotope Composition ◽  
Crystalline Rocks ◽  
Canadian Shield ◽  
Granitic Rocks ◽  
Baffin Island ◽  
Grenville Province ◽  
Metasedimentary Rocks ◽  
Rock Types ◽  
Northern District ◽  
Basic Rocks

The average 18O/16O ratios of the major rock types of the surface crystalline rocks in different parts of the Canadian Precambrian Shield have been determined, using 47 composite samples prepared from 2221 individual rock specimens. The sampling areas include Baffin Island, northern and southwestern Quebec, Battle Harbour – Cartwright, northern District of Keewatin, Fort Enterprise, Snowbird Lake, Kasmere Lake, and Saskatchewan, covering approximately 1 400 000 km2. The granitic rocks from the Superior, Slave, and Churchill Provinces vary only slightly from region to region (δ18O = 6.9–8.4‰) and are significantly lower in 18O than similar rock types from the younger Grenville Province (δ = 9.2–10.0‰). The sedimentary and metasedimentary rocks have δ18O = 9.0–11.7‰ and hence are considerably lower than their Phanerozoic equivalents, possibly reflecting the presence of a high percentage of little-altered igneous rock detritus in the original sediments. The basic rocks in most regions fall within a δ18O range of 6.8–7.6‰, except in northern and southwestern Quebec where the δ-values are abnormally high (8.5–8.9‰). The overall average 18O/16O ratio of the surface crystalline rocks of the Canadian Shield is estimated to be 8.0‰, which represents an enrichment with respect to probable mantle derived starting materials by about 2‰.

Determination of the characteristics of crystalline rocks by field experiments: a review

1986 ◽  
Vol 319 (1545) ◽  
pp. 139-156 ◽  
Keyword(s):  
Radioactive Waste ◽  
Field Experiments ◽  
The United States ◽  
Crystalline Rocks ◽  
Granitic Rocks ◽  
Rock Types ◽  
Basement Rocks ◽  
Deep Boreholes ◽  
High Level ◽  
Underground Research Laboratory

Crystalline rocks, particularly granitic rocks and basalts, are one of the principal rock types under consideration as a potential host rock for a high-level radioactive waste repository. Permeability in such rocks is related to discontinuities of various scales, and the quantification and prediction of groundwater flow within both the fractures and the intact rock between the fractures is the major goal of field experiments. The Canadian Underground Research Laboratory is unique in that the hydrogeological conditions within a large volume of rock surrounding the experimental shaft are being monitored before, during and after excavation and the results compared with model predictions. In Switzerland twelve deep boreholes are being drilled to over 1000 m to investigate crystalline basement rocks beneath a cover of sediments. The Stripa Mine in Sweden has hosted a major experimental programme including heater tests to stimulate the thermal effect of radioactive waste and hydrogeological tests at various scales down to individual fractures. The United States of America, the United Kingdom, France and Finland have also embarked on major experimental programmes. Continuing research is needed, with an emphasis on field experiments and research in underground rooms, to provide the data on which detailed risk assessments can be based.

Tin-bearing potential of some Devonian granitic rocks in S.W. Nova Scotia

1976 ◽  
Vol 11 (2) ◽  
Author(s):  
T.E. Smith ◽  
A. Turek
Keyword(s):  
Nova Scotia ◽  
Granitic Rocks

Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia

1972 ◽  
Vol 9 (9) ◽  
pp. 1074-1086 ◽  
Author(s):  
Randall F. Cormier
Keyword(s):  
Nova Scotia ◽  
Mean Value ◽  
Granitic Rocks ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Granitic Intrusion ◽  
Radiometric Ages ◽  
Northern Highlands

Rubidium–strontium whole-rock and mineral ages of granitic rocks from fourteen localities on Cape Breton Island have been measured. The ages cluster about a mean value of about 560 m.y. and indicate that most of the granitic rocks on the island have primary ages that are close to the Cambrian–Precambrian (Hadrynian) boundary. Some of the granitic rocks, particularly in the northern highlands, may have considerably younger, Siluro–Devonian (Acadian?), primary ages. Evidence is presented suggesting that simple biotite ages are not always reliable for the measurement of primary ages of granitic rocks. It. is suggested that, the granitic rocks having primary ages close to the Cambrian-Precambrian boundary be referred to a hitherto generally unrecognized episode of granitic intrusion, the Bretonian.

The Geochemistry of the Granitic Rocks of Halifax County, Nova Scotia

1974 ◽  
Vol 11 (5) ◽  
pp. 650-657 ◽  
Author(s):  
T. E. Smith
Keyword(s):  
Nova Scotia ◽  
Trace Element ◽  
Major Element ◽  
Biotite Granite ◽  
Granitic Rocks ◽  
Trace Element Chemistry ◽  
Quartz Monzonite ◽  
Lower Palaeozoic ◽  
Element Variation

Studies of part of a large batholith in southwest Nova Scotia show that granitic rocks of two different ages penetrate the Lower Palaeozoic metasediments of the Meguma Group. They are distinguished by their field relationships, mineralogy, and petrology from an older series, varying from biotite granodiorite through quartz monzonite to muscovite biotite granite, which is penetrated by younger large dikes, up to 1.5 km wide, of alaskite. Rb–Sr whole rock isochron ages show that the older series was emplaced approximately 415 m.y. ago and that the younger alaskite dikes were emplaced about 350 m.y. ago. Major and trace element chemistry shows that the older series of granitic rocks were formed by differentiation of a calc-alkali magma in situ. The younger dikes are all highly silicic, show limited major element variation, and have been affected by hydrothermal metasomatism.

Radiometric Ages of Granitic Rocks, Cape Breton Island, Nova Scotia: Discussion

1973 ◽  
Vol 10 (1) ◽  
pp. 112-112
Author(s):  
Randall F. Cormier
Keyword(s):  
Nova Scotia ◽  
Granitic Rocks ◽  
Cape Breton Island ◽  
Cape Breton ◽  
Radiometric Ages

scholarly journals Evaluating the Origin of Garnet, Cordierite, and Biotite in Granitic Rocks: a Case Study from the South Mountain Batholith, Nova Scotia

2009 ◽  
Vol 50 (8) ◽  
pp. 1477-1503 ◽  
Author(s):  
S. Erdmann ◽  
R. A. Jamieson ◽  
M. A. MacDonald
Keyword(s):  
Nova Scotia ◽  
Granitic Rocks ◽  
The South ◽  
South Mountain Batholith
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