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Small grains and big implications; accessory Ti- and Zr-minerals as petrogenetic indicators in HP and UHP marbles

Peter Tropper
Small grains and big implications; accessory Ti- and Zr-minerals as petrogenetic indicators in HP and UHP marbles
American Mineralogist (July 2014) 99 (7): 1197-1198

Abstract

The paper by Proyer et al. (2014; this issue) demonstrates that Ti- and Zr-bearing accessory minerals (rutile, titanite, zircon) record through their reaction textures part of the metamorphic history of a UHP marble. Calculation of relevant petrogenetic grids has the power to constrain the retrograde P-T path based on phase stability fields and the geothermobarometric evaluation of H (sub 2) O-independent mineral reactions involving these Ti- and Zr-bearing minerals. They calculated simple petrogenetic grids in the system TiO (sub 2) -ZrO (sub 2) -CaO-MgO-Al (sub 2) O (sub 2) -SiO (sub 2) -CO (sub 2) -H (sub 2) O (TZCMASCH) for calcite-dolomite marbles with forsterite/antigorite in excess and including those Ti- and Zr-bearing minerals for which thermodynamic data are known (rutile, titanite, geikielite, zircon, baddeleyite) and delineated their stability fields as well as the succession of their stability regions. This approach allowed the authors to infer the shape of the retrograde P-T path. Thus the combination of very careful petrography, calculated simple petrogenetic grids and the application of geothermometry involving these Ti- and Zr-bearing accessory minerals becomes an indispensible tool when reconstructing a metamorphic rock"s evolution.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 99
Serial Issue: 7
Title: Small grains and big implications; accessory Ti- and Zr-minerals as petrogenetic indicators in HP and UHP marbles
Author(s): Tropper, Peter
Affiliation: University of Innsbruck, Institute of Mineralogy and Petrography, Innsbruck, Austria
Pages: 1197-1198
Published: 201407
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 14
Accession Number: 2014-058154
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
N41°10'00" - N42°10'00", E23°30'00" - E25°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201431
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