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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
Source PublicationACTA GEOLOGICA SINICA-ENGLISH EDITION
Volume80Issue:4Pages:550-556
SubtypeArticle
AbstractIn 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.
KeywordDelta B-11 Formation Water Water-rock Interaction Tarim Basin
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordCOAST SEDIMENTARY BASIN ; OIL-FIELD BRINES ; BORON ISOTOPE ; DELTA-D ; GEOCHEMISTRY ; ORIGIN ; OXYGEN ; MIGRATION ; STRONTIUM ; CHEMISTRY
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000240249700011
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5780
Collection青海盐湖研究所知识仓储
Affiliation1.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
Recommended Citation
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.
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