Strontium and boron isotopic constraint on the marine origin of the Khammuane potash deposits in southeastern Laos

查看全文 作　　者：TAN [1,2]HongBing;MA [3]HaiZhou;LI [3]BinKai;ZHANG [3]XiYing;XIAO [3]YingKai

机构地区：[1]School of Earth Science and Engineering, Hohai University, Nanjing 210098, China;[2]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanfing 210098, China;[3]Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China

出　　处：《Chinese Science Bulletin》索引2010年第55卷第27期,共8页

基　　金：supported by the National Natural Science Foundation of China(40603007 and 40903024) 摘　　要：Since 2006,we have conducted a geological exploration of the Khammuane area in southeastern Laos.Several thick sequences of potash deposits containing sylvite and carnallite were discovered from drilling Paleocene strata of the Thangon Formation(E1tg).To constrain the origin of the brine that formed thick sequences of salt mineral deposits,we measured the strontium and boron isotope composition of some salt minerals in the potash deposit.Boron isotope composition of halite-and potash-associated minerals in the Khammuane potash deposit varied from 19.91%to 31.01‰,which differs significantly from continental evaporates(-6.83‰--5.79‰)but is very close to that of salts precipitated from evapo-concentrated seawater(10‰-36‰).The 87Sr/86Sr ratios(0.707542 to 0.709461)of salts were also close to the values of Paleocene seawater(0.70772 to 0.707830).The content of Br-(0.01%-0.25%)and Br×103/Cl ratios(0.10-0.52)of halite were>10 times higher than that of common continental salts.These characteristics indicate clearly that the Laos potash deposits were deposited from seawater.The small variation in boron and strontium isotopes in all salt sedimentary sequences(gypsum-halite-potash-halite)also suggests that the recharge source should be stable and the effects of other continental water mixing are negligible.Large-scale potash deposits are commonly precipitated from seawater.Hence,the results of recent regional drilling work and geochemical research suggest extensive potash resources could occur in the Thangon Formation of southeastern Laos. 关键词：同位素组成东南部地区钾盐矿床锶同位素老挝硼沉积序列成因

相关文献

参考文献（40）
引证文献（44）
耦合文献（108）

参考文献(40)

引证文献(44)

耦合文献(108)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Strontium and boron isotopic constraint on the marine origin of the Khammuane potash deposits in southeastern Laos

参考文献(40)

引证文献(44)

耦合文献(108)

用户提示