scholarly journals Origin and Deformational and Metamorphic History of Gold-Bearing Quartz Veins on the eastern Shore of Nova Scotia

1990 ◽  
Author(s):  
P F Williams ◽  
C Hy
Keyword(s):  
Nova Scotia ◽  
Eastern Shore ◽  
Quartz Veins ◽  
Metamorphic History ◽  
History Of ◽  
Gold Bearing

A late-glacial – Holocene palaeoecological record from Pye Lake on the eastern shore of Nova Scotia, CanadaGeological Survey of Canada Contribution 20080395.

2009 ◽  
Vol 46 (9) ◽  
pp. 637-650 ◽  
Author(s):  
Robert J. Mott ◽  
Ian R. Walker ◽  
Samantha L. Palmer ◽  
Martin Lavoie
Keyword(s):  
Nova Scotia ◽  
Younger Dryas ◽  
Late Glacial ◽  
Forest Composition ◽  
Eastern Shore ◽  
The North ◽  
Tundra Vegetation ◽  
History Of ◽  
Climatic History ◽  
Recent Sediments

Pollen and chironomid analyses and radiocarbon dating at Pye Lake on the eastern shore of Nova Scotia are used to outline the vegetation and climatic history of the area. The coast was deglaciated prior to ∼12 200 14C BP (14 300 cal BP), and herbaceous tundra vegetation invaded the area. Midge-inferred maximum summer surface-water temperatures in the lake ranged between 9 and 11 °C. Subsequent gradual warming to ∼18 °C by 10 800 14C BP (12 725 cal BP) favoured the migration of a variety of herbaceous and shrub taxa into the region. Rapid cooling to ∼10 °C saw vegetation revert to herbaceous tundra communities. This interval, related to the Younger Dryas cold interval of the North Atlantic and Europe, lasted until ∼10 000 14C BP (11 630 cal BP). The climate then warmed again to conditions similar to those that prevailed immediately before onset of Younger Dryas cooling. Further warming saw successive tree species migrate into the area until, by the mid-Holocene, the forests contained most of the taxa prevalent today. Since ∼3500 years ago, cooling of the climate has favoured conifer species over broad-leaved taxa. Agriculture and logging practices in the last 150 years have altered the forest composition, but pollen analysis of the most recent sediments cannot resolve these changes adequately.

Mechanics of formation of gold-bearing quartz veins, Nova Scotia, Canada—Comment

1989 ◽  
Vol 166 (4) ◽  
pp. 351-352 ◽  
Author(s):  
J.R. Henderson ◽  
T.O. Wright ◽  
M.N. Henderson
Keyword(s):  
Nova Scotia ◽  
Quartz Veins ◽  
Gold Bearing

Metamorphic history of the Hemlo gold deposit from Al2SiO5 mineral assemblages, with implications for the timing of mineralization

1999 ◽  
Vol 36 (1) ◽  
pp. 33-46 ◽  
Author(s):  
Wayne G Powell ◽  
David RM Pattison ◽  
Paul Johnston
Keyword(s):  
Gold Deposit ◽  
Quartz Veins ◽  
Metamorphic History ◽  
Fluid Infiltration ◽  
Mineral Assemblages ◽  
Metamorphic Assemblage ◽  
The Matrix ◽  
History Of ◽  
T Path ◽  
Late Growth

Textural relations between Al2SiO5 phases, and deformation fabrics, provide constraints on the metamorphic history of the Hemlo gold deposit. Kyanite in the deposit is most common within and on the margins of boudinaged quartz ± realgar veins, and less commonly as rotated porphyroblasts within the matrix of schistose rocks. Kyanite predates the main (D2) schistosity. Sillimanite postdates kyanite, occurring irregularly as discrete knots and foliae that run parallel to, but sometimes cut across, the principal (D2) foliation, indicating that sillimanite postdates the D2 foliation. We regard kyanite to be part of the peak metamorphic assemblage, with sillimanite representing a partial later overprint most likely related to fluid infiltration. Rare andalusite occurs in two associations: as late-stage, clean, idioblastic crystals; and as large, fractured grains, locally overprinted by sillimanite, in boudinaged quartz-realgar veins. We suggest two possible origins for this second form of andalusite, one involving generally late growth, the second involving early growth prior to the development of peak metamorphic kyanite. Although not unambiguous, we prefer the second scenario. P-T conditions from petrogenetic grid constraints, and new geothermobarometric estimates, indicate 6-7 GPa, 600-650°C for the peak kyanite grade metamorphism (ca. 2677 Ma?), and 4-5 GPa, 600°C for the later sillimanite overprint (ca. 2672 Ma?). We see these two events as part of an evolving P-T path in a single metamorphic event. In our early andalusite scenario, the andalusite may have formed from pyrophyllite breakdown at 2-4 GPa, 450°C, possibly associated with emplacement of the regional suite of granodiorite plutons (ca. 2686 Ma). Late andalusite formed sporadically on the retrograde path. The occurrence of deformed andalusite and aligned kyanite in and on the margins of boudinaged auriferous realgar-stibnite-quartz veins provides evidence in support of a premetamorphic mineralization event.

scholarly journals HISTORY OF DISCOVERY AND STUDY OF «ZOLOTAYA GORA» DEPOSIT OF PRIAMUR GOLD-BEARING PROVINCE (AMUR REGION, RUSSIA)

2021 ◽  
pp. 87-95
Author(s):  
ANTON VLADIMIROVICH MELNIKOV ◽  
◽  
VITALY ALEKSEEVICH STEPANOV ◽  
Keyword(s):  
Amur Region ◽  
Isotopic Age ◽  
Ore Deposit ◽  
Quartz Veins ◽  
Ore Bodies ◽  
History Of ◽  
Gold Ore Deposit ◽  
Gold Sulfide ◽  
Sr Method ◽  
Gold Bearing

Information about the history of discovery, development and study of the gold ore deposit «Zolotaya Gora» in Priamur gold-bearing province is present. The deposit is represented by six gold-sulfide-quartz veins located in the zone of crumpling and diaphthoresis along the gneisses and crystalline schists of the Archean. Ore bodies intersect with diorite porphirites of the Mesosoic age. The deposit had the richest gold-sulfide-quartz ores in the Amur region with an average gold grade of about 120-140 g/t. The isotopic age of mineralization, determined by Rb-Sr method, is 155±7 million years.

Tectono-metamorphic history of the ophiolitic Lento unit (northern Corsica): evidences for the complexity of accretion-exhumation processes in a fossil subduction system

2007 ◽  
Vol 20 (1-2) ◽  
pp. 99-118 ◽  
Author(s):  
Nicola Levi ◽  
Alessandro Malasoma ◽  
Michele Marroni ◽  
Luca Pandolfi ◽  
Matteo Paperini
Keyword(s):  
Metamorphic History ◽  
History Of ◽  
Subduction System

Eighteenth-Century Sierra Leone English

1999 ◽  
Vol 20 (1) ◽  
pp. 1-34 ◽  
Author(s):  
Michael Montgomery
Keyword(s):  
Eighteenth Century ◽  
African American ◽  
Nova Scotia ◽  
African Americans ◽  
Sierra Leone ◽  
American English ◽  
African American English ◽  
History Of ◽  
Nova Scotian

This essay examines the language of an expatriate community as found in letters and petitions written by African Americans who migrated to Sierra Leone by way of Nova Scotia in 1792. These documents provide some of the earliest first-hand evidence of African American English and contribute to debates about the history of that variety. The paper compares selected grammatical features in that variety to modern-day African Nova Scotian English for insights to the history of African American English and develops a case for the principled use of manuscript documents for reconstructing earlier stages of colloquial English.

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