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The geology of the Broken Hill-type Pinnacles Pb-Zn-Ag deposit, western New South Wales, Australia

Joanna M. Parr
The geology of the Broken Hill-type Pinnacles Pb-Zn-Ag deposit, western New South Wales, Australia
Economic Geology and the Bulletin of the Society of Economic Geologists (July 1994) 89 (4): 778-790

Abstract

The Pb-Zn-Ag Pinnacles deposit lies in the Proterozoic rocks of the Willyama Supergroup of western New South Wales and consists of a series of stacked strata-bound sulfide lenses, hosted in a mixed suite of pelites, psammopelites, and inferred meta-exhalites. Sulfur isotope data for the orebodies have delta (super 34) S values close to zero, but show some variation between sulfide lenses. Meta-exhalites include garnetites, quartz-gahnite rocks, and quartz-garnet rocks in immediate association with the mineralized rocks and the quartz-magnetite rocks as country rocks nearby. The deposit has been subject to granulite facies prograde metamorphism and kyanite-grade retrograde metamorphism, and is associated with four phases of folding (D (sub 1-4) ) and crosscutting retrograde shear zones (D (sub 5) ).The Pinnacles and Broken Hill deposits have many features in common, e.g., associated rock types and geochemical trends (including isotopic composition and REE concentrations). However, there are also several important differences including lithological associations, Fe/Mn ratios, inferredf (sub O (sub 2) ) during sulfide precipitation, and size. These similarities and differences have direct bearing on genetic models for the formation of Broken Hill-type deposits. The geologic setting of the Pinnacles deposit is discussed in terms of temporal and/or spatial facies changes. The implications of these findings and observations are significant for the exploration of Broken Hill-type deposits.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 89
Serial Issue: 4
Title: The geology of the Broken Hill-type Pinnacles Pb-Zn-Ag deposit, western New South Wales, Australia
Author(s): Parr, Joanna M.
Affiliation: University of Newcastle, Department of Geology, Newcastle, N.S.W., Australia
Pages: 778-790
Published: 199407
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 57
Accession Number: 1994-052032
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
S37°30'00" - S28°15'00", E141°00'00" - E153°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists
Update Code: 199424
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