AN Fu-yuan
School of Geographical Science, Key Laboratory of Physical Geography and Environmental Processes of Qinghai Province, Qinghai Normal University, Xining 810008, China;Academy of Plateau Science and Sustainability Peoples Government of Qinghai Province & Beijing Normal University, Xining 810008, ChinaZHANG Xi-ying
Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaCHENG Xia-li
School of Geographical Science, Key Laboratory of Physical Geography and Environmental Processes of Qinghai Province, Qinghai Normal University, Xining 810008, ChinaMA Zhen-ying
Laboratory of Detection, Qinghai Nuclear Industry Geological Bureau, Institute of Nuclear Geology, Qinghai Nuclear Industry Geological Bureau, Xining 810008, ChinaGENG Jun
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaLI Jiang-yao
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, ChinaP611;P619.21+1
Located in the middle part of the east Kunlun Mountains, the Golmud River catchment is covered with a large area of granite, especially the potassium-rich granite in local areas. In order to understand the evolution of distal Qarhan Salt Lake, it is important to study the distribution of these granites, the variation of the K, B, and Li elements, and their temporal and spatial migration. In this study, the authors collected samples from granites and their weathered detrital materials along Kunlun River section, Xidatan River section, and Xiaogangou section of Golumd River catchment. Based on major and trace element analysis, rock slice identification, chemical weathering index, and optical stimulated luminescence dating (OSL), the authors investigated the salt-forming elements in the granites and their weathered products. The results are as follows:① In the Xidatan and Kunlun River catchment, gray-white, medium-fine grained late Variscan granulites are predominant, with intermediate level potassium content; In the Xiaogangou River section, there are mainly gray-white and flesh red late Yanshanian porphyritic adamellites, which are potassium-rich granites, and thus these areas are advantageous metallogenic targets of potassium; ② K content gradually decreases and B, Li element content gradually increases with the increasing weathering degree in the granite. The Xiaogangou River section has high K, B content, but the Kunlun River section shows high Li content; ③ The chemical weathering indexes, such as WPI, LOI, are well coupled with the element content variations of different weathering degree samples, indicating that these two chemical weathering indexes are sensitive to the variation of weathering degree; ④ The alluvial sediments section of Xiaogangou River catchment has OSL ages from 95.9±10.5 ka in the bottom layer to 17.7±1.0 ka in the upper layer, and the WPI index, K, B and Li content variation curves in the sections indicate that the salt-forming elements migrations in the granites in the Golmud River catchment seem to have been related to the chemical weathered degree change associated with the glacial-interglacial cycles since late Pleistocene, and these elements have provided abundant saline minerals for the Qarhan Salt Lake.
安福元,张西营,程夏丽,马振营,耿鋆,李姜瑶,2021,格尔木河流域富钾花岗岩中成盐元素风化迁移的时空演变[J].岩石矿物学杂志,40(1):14~26. AN Fu-yuan, ZHANG Xi-ying, CHENG Xia-li, MA Zhen-ying, GENG Jun, LI Jiang-yao,2021,The spatial-temporal variation of weathering and migration of salt-forming elements in potassium-rich granites of the Golmud River catchment[J]. Acta Petrologica et Mineralogica,40(1):14~26.
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