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Open thermal convection dolomitization: an example from East Yunnan (China)

Published online by Cambridge University Press:  05 June 2020

Jing-Qi Zhang Open the ORCID record for Jing-Qi Zhang [Opens in a new window] ,
Zhen-Kui Jin ,
Xiao-Er Zhu ,
Yang Li ,
Qi-Heng Guo  and
Shu-Ting Shi
Jing-Qi Zhang
Affiliation:
College of Geosciences, China University of Petroleum, Beijing102249, China
Zhen-Kui Jin*
Affiliation:
College of Geosciences, China University of Petroleum, Beijing102249, China
Xiao-Er Zhu
Affiliation:
College of Geosciences, China University of Petroleum, Beijing102249, China
Yang Li
Affiliation:
College of Geosciences, China University of Petroleum, Beijing102249, China
Qi-Heng Guo
Affiliation:
College of Geosciences, China University of Petroleum, Beijing102249, China
Shu-Ting Shi
Affiliation:
College of Geosciences, China University of Petroleum, Beijing102249, China
*
Author for correspondence: Zhen-kui Jin, Email: jinzhenkui@188.com
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Abstract

Dolostones are widely developed in the middle Permian rocks of East Yunnan, China, mainly in the shoal-facies Maokou Formation. The previously reported dolostone formation mechanisms cannot explain the distribution and geochemical characteristics of these dolostones, in particular their strontium, magnesium and oxygen isotope signatures. To help predict the distribution of dolostone reservoirs and reduce the exploration risk and cost, this study proposes a new model of dolomitization: open thermal convection dolomitization. In this new dolomitization model, Mg2+ in dolomitizing fluids originates mostly from seawater, with a minor component coming from deep hydrothermal fluids. Elevated heat flux (in this case due to the nearby Emei mantle plume) causes spatial temperature variations in the fluid along the circulation flow pathways, resulting in fast and pervasive dolomitization of limestone. The proposed model not only explains the characteristics and distribution of dolostones in the study area but also serves as a reference for predicting the distribution of dolostones in other areas subjected to thermal convection.

Keywords

dolostonedolomitizationthermal convectionEmei mantle plumemiddle PermianEast Yunnan
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 2 , February 2021 , pp. 330 - 348
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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