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the characteristics of the hydrothermal exhalative dolostone of lucaogou formation in santanghu basin and its geology setting indication

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 131-页

作者： LI Zhexuan LIU Yiqun JIAO Xin LI Hong Department of geology Northwest University710069

The NW-SE trending santanghu basin is located in Xinjiang,NW China,between Tianshan Mountains and Altai *** tectonic evolution history of north Xinjiang has long been debated,especially the question when did that area began its intraplate rift evolution *** abstract discusses the features and possible origin of the hydrothermal exhalative dolostone of lucaogou formation in santanghu basin,aiming to provide relevant information about this *** target dolostone are characterized by extreme thin lamina of 0.3cm–1 cm ***,ankerite,potassium feldspar and analcite are dominant *** dolomite is poor crystallized and is in anhedral or subhedral *** is generally porphyritic,few is in irregular *** has to be noted that the porphyritic ankerite commonly develop zonal textures characterized by rings with various Fe O *** feldspar and analcite（lucaogou formation and they perform intermittent or scattered distribution in rock *** work done by our study team showsδ13C PDB values are 4.8‰;1.4‰,6.93‰on ***δ18 O PDB values are between-5‰;21.1‰,-10.94‰on *** calculated byδ13C andδ18 O is between 128.35 and 136.81,134.42 on *** content of dolostones in study area reaches to164×10-6;37×10-6（379.1×10-6 on average）,most dolostone in target area are between 0.70457;.706194, average at *** either accompanying residual tuff or residual leucite is found via electron probe,this indicates the analcite may derive form analcime ***,fragments of carbonatite rocks proves mantle-derived magmatism *** rapid variation ofδ18 O indicates multiple interactions of hydrothermal fluids with lake water during lucaogou sedimentary period.87Sr/86Sr values a

关键词： the characteristics of the hydrothermal exhalative dolostone of lucaogou formation in santanghu basin and its geology setting indication

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