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Petrology of low-temperature, ultrahigh-pressure marbles and interlayered coesite eclogites near Sanqingge, Sulu terrane, eastern China

Published online by Cambridge University Press:  05 July 2018

Yong-Feng Zhu ,
H.-J. Massonne  and
Men-Fan Zhu
Yong-Feng Zhu*
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School ofEarth and Space Sciences, Peking University, Beijing 100871, China
H.-J. Massonne
Affiliation:
Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstr. 18, D-70174 Stuttgart, Germany
Men-Fan Zhu
Affiliation:
The Key Laboratory of Orogenic Belts and Crustal Evolution, School ofEarth and Space Sciences, Peking University, Beijing 100871, China
*
* E-mail: yfzhu@pku.edu.cn
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Abstract

Marbles and interlayered coesite-bearing eclogites near the village ofSanqingge in the Sulu ultrahighpressure (UHP) terrane ofeastern China were studied to estimate their P-T evolution. Using garnet, omphacite and phengite as geothermobarometers, the coesite eclogites are calculated to have experienced P-T conditions of3.4 –3.7 GPa and ~600ºC (stage I), followed by decompression and a slight temperature decrease to 2.7–3.2 GPa and 520–560ºC respectively (stage II) and later to 2.6–2.8 GPa and ~500ºC (stage III). No water influx affected the eclogites until reaching amphibolite facies conditions of 0.5–1.3 Gpa and 595–685ºC (stage IV). As we interpret the occasional appearance ofcalcite with magnesite relics in the core as a reaction ofUHP dolomite and magnesite with Ca-rich fluids at stage IV to form CaCO3, the calculated pressure for stage I could be the maximum pressure experienced by these rocks. Thus, the crustal material ofthe Sanqingge quarry, originally sedimentary carbonates (now marbles) and interstratified basic tuffs (now eclogites), has been buried to a depth of ≥ 120 km at ~600ºC. This burial occurred in a subduction setting along a very low geotherm of 5–6ºC/km. The exhumation possibly occurred in the environment ofa subduction channel.

Keywords

coesiteeclogitemarblemagnesiteSulu UHP terrane.
Type
Research Article
Information
Mineralogical Magazine , Volume 73 , Issue 2 , April 2009 , pp. 307 - 332
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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