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Immiscibility and continuous felsic melt-fluid evolution within the Rio Blanco porphyry system, Chile; evidence from inclusions in magmatic quartz

Paul Davidson and Vadim S. Kamenetsky
Immiscibility and continuous felsic melt-fluid evolution within the Rio Blanco porphyry system, Chile; evidence from inclusions in magmatic quartz
Economic Geology and the Bulletin of the Society of Economic Geologists (December 2001) 96 (8): 1921-1929

Abstract

The 5.2-3.9 m.y. late porphyries at Rio Blanco are spatially associated with hydrothermal tourmaline-cemented breccias and a significant Cu-Mo deposit. Magmatic inclusions in quartz are represented by rhyolitic glass (type 1), crystallized volatile-rich felsic melt (type 2), H (sub 2) O-and salt-rich fluids, and microphenocrysts. The coexistence of types 1 and 2 material within the same growth plane, and within a single inclusion, suggests that crystallizing rhyolite magma separated into two silicate melts (volatile-poor and volatile-rich). The volatile-rich silicate melt had a prolonged evolution, extending below the solidus of the volatile-poor silicate melt, with a progressive reduction of the silicate/volatile ratio, and ultimately to highly saline fluids. The latter may have been the source of hydrothermal fluids with the potential to transport metals.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 96
Serial Issue: 8
Title: Immiscibility and continuous felsic melt-fluid evolution within the Rio Blanco porphyry system, Chile; evidence from inclusions in magmatic quartz
Affiliation: University of Tasmania, Center for Ore Deposit Research, Hobart, Tasmania, Australia
Pages: 1921-1929
Published: 200112
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 30
Accession Number: 2002-014803
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
S56°00'00" - S17°45'00", W76°00'00" - W67°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200206
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