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Origin of Halite in the Lanping–Simao Basin,Southeastern Tibetan Plateau,China:Evidence from sr and cl isotopes

Acta Geologica Sinica(English Edition) 2022年第6期96卷 2028-2039页

作者： DU Shaorong ZHENG Mianping LÜYuanyuan ZHANG Yongsheng ZHANG Xuefei MIAO Zhongying LI Mingming MLR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral ResourcesChinese Academy of Geological Sciences(CAGS)Beijing 100037China College of Geoscience and Surveying Engineering China University of Mining and Technology(Beijing)Beijing 100083China

The Lanping−Simao Basin is located on the southeastern Tibetan Plateau,China,and contains massive evaporites.The origin of evaporites in the basin has been hotly debated because of the strong transformation by tectonic movement.Forty halite samples from borehole MK-3 in the Mengyejing area of the basin were collected and analyzed using XRD,cl-sr isotopes and chemical compositions to trace the origin of the evaporites in the basin.The Br×10^(3)/cl ratios of the halite samples are between 0 and 0.55,most of which are synchronized with the law of seawater evaporation and at the stage of halite precipitation from seawater,indicating that the evaporites are mainly of marine origin.The^(87)sr/^(86)sr ratios range from 0.707489 to 0.711279;after correction,the^(87)sr/^(86)sr 145 Ma ratios range from 0.704721 to 0.707611,equivalent with the 87sr/86sr ratios of seawater at 145 Ma,indicating a marine origin.The decay of 87Rb in the evaporite during deposition,change of the depositional environment and the unsealed environment at a later period resulted in the present^(87)sr/^(86)sr ratios of some samples being high.The δ^(37)cl value compositions range from−0.38‰to 0.83‰,which is consistent with the δ^(37)cl value composition of the world marine halite(−0.6‰to 0.4‰),further confirming that seawater is the main origin.In addition,the high δ^(37)cl value of some samples at the boundary of the upper and lower evaporite layers might be related to the influence of δ^(37)cl-rich brine and the incomplete dissolution of the halite.

关键词： evaporites halite potash cl-sr isotopes Lanping-Simao Basin

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