In situ stable isotopic constraints on dolomitizing fluids for the hydrothermally-originated saddle dolomites at Keping, Tarim BasinReport as inadecuate




In situ stable isotopic constraints on dolomitizing fluids for the hydrothermally-originated saddle dolomites at Keping, Tarim Basin - Download this document for free, or read online. Document in PDF available to download.

Chinese Science Bulletin

, Volume 58, Issue 23, pp 2877–2882

First Online: 12 April 2013Received: 09 January 2013Accepted: 26 February 2013DOI: 10.1007-s11434-013-5801-7

Cite this article as: Dong, S., Chen, D., Qing, H. et al. Chin. Sci. Bull. 2013 58: 2877. doi:10.1007-s11434-013-5801-7

Abstract

Detailed characterization of diagenetic fluid behaviour and evolution is commonly hindered by shortage of appropriate and economic methods to carry out in situ analysis in the tiny diagenetic mineral crystals. Using micromill sampling method, this study presents in situ stable isotopic data for the growth zones of saddle dolomite crystals in the hydrothermally-altered dolostones of Upper Cambrian Furongian at Keping, Tarim Basin, NW China. These data show minor and large variations in δC −0.7‰ to −1.5‰ VPDB and δO −8.3‰ to −13.8‰ VPDB, respectively, from the cores to outer rims of the dolomite crystals and suggest that saddle dolomites precipitated from dolomitizing fluids with similar carbon sources but oscillatory temperatures during different formation stages. This scenario is confirmed by microthermometry of fluid inclusions within the growth zones of dolomite crystals. This study indicates that in situ isotope analysis could provide more detailed information related to the source and pathway of dolomitizing fluids, facilitating better characterization of dolomitizing fluids and processes.

KeywordsTarim Basin Upper Cambrian saddle dolomite micromill sampling in situ stable isotope analysis fluid inclusion microthermometry petrography This article is published with open access at Springerlink.com

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Author: ShaoFeng Dong - DaiZhao Chen - HaiRuo Qing - MaoSheng Jiang - XiQiang Zhou

Source: https://link.springer.com/



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