Regional hydrothermal alteration and 18O-depletion of the ca. 620 Ma Huntington Mountain pluton and related rocks, Cape Breton Island, Canada

被引：1

作者：

Petts, Duane C. ^{[1
]}

Longstaffe, Frederick J. ^{[1
]}

Potter, Joanna ^{[1
]}

Barr, Sandra M. ^{[2
]}

White, Chris E. ^{[3
]}

机构：

[1] Univ Western Ontario, London, ON N6A 5B7, Canada

[2] Acadia Univ, Dept Earth & Environm Sci, Wolfville, NS B4P 2R6, Canada

[3] Nova Scotia Dept Nat Resources, Halifax, NS B3J 2T9, Canada

来源：

ATLANTIC GEOLOGY | 2012年 / 48卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

NEOPROTEROZOIC IGNEOUS ROCKS; OXYGEN-ISOTOPE; HYDROGEN ISOTOPE; NOVA-SCOTIA; FRACTIONATION; MINERALS; TERRANE; EVOLUTION; DISEQUILIBRIUM; GEOCHEMISTRY;

D O I：

10.4138/atlgeol.2012.003

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The ca. 620 Ma Huntington Mountain pluton and East Bay Hills Group, which comprise part of the Avalonian Mira terrane, Cape Breton Island, Nova Scotia, Canada, are characterized by pervasive propylitic alteration (chlorite, epidote, sericite, and Fe-Ti oxides) and low delta O-18 values (-3.8 to +6.2%). This alteration is a product of interaction with hydrothermal fluids of meteoric and/or meteoric-seawater mixed origin at similar to 300 degrees C over a range of water/rock (w/r) ratios. Locally, the propylitic alteration was further overprinted by quartz-calcite- sericite alteration. Such samples have generally higher delta O-18(WR) values (up to +9.5%), reflecting interaction with evolved meteoric water at lower temperatures (similar to 200 degrees C) and very low w/r ratios. The hydrothermal fluids responsible for widespread propylitic alteration of the Huntington Mountain-East Bay Hills complex (and regions beyond) likely entered the crust during initial rifting of the Mira terrane from Gondwana at ca. 575-550 Ma.

引用

页码：54 / 69

页数：16