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Strontium and boron isotopic constraint on the marine origin of theKhammuane potash deposits in southeastern Laos
Tan HongBing; Ma HaiZhou; Li BinKai; Zhang XiYing; Xiao YingKai
2010
发表期刊CHINESE SCIENCE BULLETIN
ISSN1001-6538
卷号55期号:27-28页码:3181-3188
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
文献类型期刊论文
条目标识符http://ir.isl.ac.cn/handle/363002/1904
专题青海盐湖研究所知识仓储
推荐引用方式
GB/T 7714
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.
APA Tan HongBing,Ma HaiZhou,Li BinKai,Zhang XiYing,&Xiao YingKai.(2010).Strontium and boron isotopic constraint on the marine origin of theKhammuane potash deposits in southeastern Laos.CHINESE SCIENCE BULLETIN,55(27-28),3181-3188.
MLA Tan HongBing,et al."Strontium and boron isotopic constraint on the marine origin of theKhammuane potash deposits in southeastern Laos".CHINESE SCIENCE BULLETIN 55.27-28(2010):3181-3188.
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