Regional Infiltration of Meteoric Water into the Mira Terrane: a Stable Isotope Study of the Avalonian Huntington Mountain Pluton and Related Rocks, Cape Breton Island, Canada

The Avalonian Mira terrane of Cape Breton Island, Nova Scotia, Canada is composed mainly of late Proterozoic volcanic-plutonic-sedimentary rocks that formed in an evolved magmatic arc along the margin of Gondwana. The purpose of this study is to determine the source(s) and timing of the 18O-depletio...

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Bibliographic Details
Main Author: Petts, Duane C.
Format: Text
Language:unknown
Published: Scholarship@Western 2008
Subjects:
Avalon Zone
Carbon-isotope
Hydrogen-isotope
Hydrothermal
Meteoric Water
Mira Terrane
Northern Appalachian Orogen
Oxygen-isotope
Plutonic
Volcanic
Canada
Breton Island
Huntington
Mira
East Bay
Online Access:https://ir.lib.uwo.ca/digitizedtheses/4753
https://ir.lib.uwo.ca/context/digitizedtheses/article/8555/viewcontent/2023_11_20_Infiltration_of_Meteoric_Water_Into_the_Mira_Terrane_OCR.pdf
Description
Summary:The Avalonian Mira terrane of Cape Breton Island, Nova Scotia, Canada is composed mainly of late Proterozoic volcanic-plutonic-sedimentary rocks that formed in an evolved magmatic arc along the margin of Gondwana. The purpose of this study is to determine the source(s) and timing of the 18O-depletion that has affected the 620 Ma Huntington Mountain pluton and East Bay Hills volcanic suite of the Mira terrane. Plutonic and volcanic rock samples have oxygen-, hydrogen- and carbon-isotope values of-6.3 to +14.3‰, -93 to -56‰, and -7.4 to +0.1‰, respectively. These values likely signal the interaction of meteoric-dominated hydrothermal fluids with the Himtington Mountain pluton and East Bay Hills volcanic suite. The occurrence of widespread, pervasive propylitic alteration and the absence of a localized pattern of oxygen-isotope anomalies suggest that the 18O-depletion arose during initial rifting of the Mira terrane from Gondwana, ca. 575-560 Ma.

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