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题名: Strontium and boron isotopic constraint on the marine origin of theKhammuane potash deposits in southeastern Laos
作者: Tan HongBing ;  马海洲 ;  Li BinKai ;  张西营 ;  Xiao YingKai
刊名: CHINESE SCIENCE BULLETIN
出版日期: 2010
卷号: 55, 期号:27-28, 页码:3181-3188
英文摘要: 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 (E(1) tg). 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 31.01aEuro degrees, which differs significantly from continental evaporates (-6.83aEuro degrees aEuro"a'5.79aEuro degrees) but is very close to that of salts precipitated from evapo-concentrated seawater (10aEuro degrees aEuro"36aEuro degrees). The (87)Sr/(86)Sr 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 Brx10(3)/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. 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 (E(1) tg). 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 31.01aEuro degrees, which differs significantly from continental evaporates (-6.83aEuro degrees aEuro"a'5.79aEuro degrees) but is very close to that of salts precipitated from evapo-concentrated seawater (10aEuro degrees aEuro"36aEuro degrees). The (87)Sr/(86)Sr 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 Brx10(3)/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.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.isl.ac.cn/handle/363002/1904
Appears in Collections:青海盐湖研究所知识仓储(2014年之前)_期刊论文

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Recommended Citation:
Tan HongBing,Ma HaiZhou,Li BinKai,et al. Strontium and boron isotopic constraint on the marine origin of theKhammuane potash deposits in southeastern Laos[J]. CHINESE SCIENCE BULLETIN,2010,55(27-28):3181-3188.
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