B, Sr, O and H isotopic compositions of formation waters from the Bachu Bulge in the Tarim Basin

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	B, Sr, O and H isotopic compositions of formation waters from the Bachu Bulge in the Tarim Basin
	Cai Chunfang ; Peng Licai ; Mei Bowen ; Xiao Yingkai
	2006-08-01
发表期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
卷号	80 期号:4 页码:550-556
关键词	Delta B-11 Formation Water Water-rock Interaction Tarim Basin
摘要	In order to elucidate the origin and migration of basinal brines in the Bachu Bulge, Tarim Basin, we have carried out analyses on chemical composition, and boron, hydrogen and oxygen isotopes of formation waters together with the XRD of clay minerals from the Paleozoic strata. The waters show Ca, B, Li and Sr enrichment and SO4 depletion in the Carboniferous and Ordovician and K enrichment in part of the Ordovician relative to seawater. The relationship between delta D and delta O-18 shows that all the data of the waters decline towards the Global Meteoric Water Line with the intersection of them close to the present-day local meteoric water, suggesting that modern meteoric water has mixed with evaporated seawater. The Sr-87/Sr-86 ratios range from 0.7090 to 0.7011, significantly higher than those of the contemporary seawater. The delta B-11 values range from +19.7 to +32.3 parts per thousand, showing a decrease with the depth and B concentrations. The results suggest that isotopically distinct B and Sr were derived from external sources. However, since the percentages of illite are shown to increase with depth among clay minerals in the study area, i.e., illite is due to precipitation rather than leaching during deeper burial, it is unlikely for illite to have contributed a significant amount of B to the waters. Thus, B with low delta B-11 values is interpreted to have been added mainly from thermal degradation of kerogen or the basalts in the Cambrian and Lower Ordovician.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5780
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Tsing Hua Univ, Dept Engn Mech, Beijing 100084, Peoples R China 3.Yangtze Univ, Hubei 434023, Peoples R China 4.Chinese Acad Sci, Qinghai Inst Salt Lake, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Cai Chunfang,Peng Licai,Mei Bowen,et al. B, Sr, O and H isotopic compositions of formation waters from the Bachu Bulge in the Tarim Basin[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2006,80(4):550-556.
APA	Cai Chunfang,Peng Licai,Mei Bowen,&Xiao Yingkai.(2006).B, Sr, O and H isotopic compositions of formation waters from the Bachu Bulge in the Tarim Basin.ACTA GEOLOGICA SINICA-ENGLISH EDITION,80(4),550-556.
MLA	Cai Chunfang,et al."B, Sr, O and H isotopic compositions of formation waters from the Bachu Bulge in the Tarim Basin".ACTA GEOLOGICA SINICA-ENGLISH EDITION 80.4(2006):550-556.