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Analysis of the Ordovician Carbonate Hydrothermal Process in Tadong Area, Xinjiang, China/Analisis del proceso hidrotermal del carbonato ordovicico en el area de Tadong, Xinjiang, China

Hydrothermal activity played an important part in the formation of the Ordovician dolostone reservoirs in Tadong area (eastern Tarim Basin). By applying the technologies of thin rock section microscopic identification, cathodoluminescence analysis, carbon and oxygen isotope analysis, trace element,...

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Published in:Earth sciences research journal 2019-06, Vol.23 (2), p.127
Main Authors: Tan, Wancang, Meng, Yuanlin, Feng, Zihui, Meng, Qi'an, Li, Qiang, Wang, Xiandong, Li, Guorong, Li, Yaguang
Format: Article
Language:English
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Summary:Hydrothermal activity played an important part in the formation of the Ordovician dolostone reservoirs in Tadong area (eastern Tarim Basin). By applying the technologies of thin rock section microscopic identification, cathodoluminescence analysis, carbon and oxygen isotope analysis, trace element, rare earth element analysis, among others, the mineralogical characteristics and geochemical characteristics of the hydrothermal process are studied. It can seen that the Ordovician hydrothermal process has represented by dolomite in various forms in the aspect of petrology and mineralogy. It is mainly composed of medium-megacryst crystalline dirty dolomite and powder-megacryst crystalline cleaner dolomite. The geochemical characteristics are the hydrothermal origin, medium-megacryst crystalline dirty dolomite with lower [delta]18O value, high Mn-Fe content, and positive Eu anomaly. The powder-megacryst crystalline has cleaner dolomite, with higher [delta]18O value, the Mn content low, and the negative Eu anomaly. Provide a reference for the Ordovician carbonate in Tadong area oil and gas exploration in the study. Keywords: Tarim basin; Tadong area; carbonate; hydrothermal process; hydrothermal dolomite. La actividad hidrotermal desempeno un papel importante en la formacion de los depositos de roca dolomitica durante el periodo del Ordovicico en el area de Tadong (cuenca oriental de Tarim). Al aplicar las tecnologias de identificacion microscopica con pruebas de laminas delgadas, analisis de catodoluminiscencia, analisis de isotopos de carbono y oxigeno, analisis de elementos traza, analisis de elementos de tierras raras, entre otros, se estudian las caracteristicas mineralogicas y las caracteristicas geoquimicas del proceso hidrotermico. Se puede ver que el proceso hidrotermal del Ordovicico representa diversas formas en el aspecto de petrologia y mineralogia de la dolomita. Este se compone principalmente de megacristales medios de dolomita cristalina sucia y megacristales de polvo de dolomita limpiadora cristalina. Las caracteristicas geoquimicas son de origen hidrotermal; los megacristales medios de dolomita cristalizada sucia tienen un valor inferior a [delta]18O; el contenido de Mn-Fe es alto mientras que la anomalia Eu es positiva. El cristalino de megacristales en polvo tiene una dolomita mas limpia, con un valor mayor a [delta]18O, un bajo contenido de Mn y una anomalia de Eu negativa. Este estudio proporciona una referencia para el carbonato ordovicico
ISSN:1794-6190
DOI:10.15446/esrj.v23n2.80525