| Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation, Qiangtang Basin: Evidence from Geochemistry Records |
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| 作者姓名： | SONG Chunhui ZENG Yongyao YAN Maodu FANG Xiaomin FENG Ying PAN Jiaqiu LIU Xifang MENG Qingquan HU Chunhu ZHONG Sirui |
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| 作者单位： | 1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China,1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China；3 Lanzhou Resources & Environment Voc-Tech College, Lanzhou 730000, China,2 CAS Center for Excellence in Tibetan Plateau Earth Sciences & Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese of Academy of Sciences, Beijing 100101, China,2 CAS Center for Excellence in Tibetan Plateau Earth Sciences & Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese of Academy of Sciences, Beijing 100101, China,1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China,1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China,4 Institute of Mineral Resources, Chinese Academy of Geological Sciences & Key Laboratory of Saline Lake Resources and Environment, Ministry of Land and Resources, Beijing 100037, China,1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China,1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China,1 School of Earth Sciences & Key Laboratory of Western China’s Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China |
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| 基金项目： | This study was supported by the National Basic Research Program of China (Grant Nos. 2011CB403003 and 2013CB956403), “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDB03020402), the National Natural Science Foundation of China (Grant No. 41272128), the College Research Program of Gansu Province (Grant No. 2016A-123). Xiaohui Fang, Gang Niu, Sa Zhang, Song Wu, Jing Bao and Jiwei Yang are thanked for laboratory assistance and fieldwork assistance. |
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| 摘 要： | The Qiangtang Basin (QB), located in the central Tibetan Plateau, is a Jurassic marine basin and one of the most important prospective salt resource belts in China. In recent decades, many outcrops of gypsiferous?bed have been found in the Jurassic marine strata in the basin. Salt springs with abnormally high sodium (Na+) contents had been identified in the Late Jurassic Xiali Formation (Fm.) in the basin in the last years. However, to date, no potash or halite deposits have been identified in the QB. Gypsum outcrops and salt springs are very important?signs in the investigation of halite and potash deposits. Therefore, the Xiali Fm. is?a potentially valuable layer to evaluate for the possible presence of halite and potash deposits in the basin. However,?few studies?have explored the formation?conditions of evaporites in the unit. Here, we present detailed geochemical records from the Yanshiping section related to the study of the formation?conditions of evaporites in the Xiali Fm. of the QB. Climate proxies based on the obviously increased anion concentrations of SO42? and Cl? and the significant correlation?coefficients of Ca2+-SO42? (R = 0.985) and Na+-Cl? (R = 0.8974) reveal that the upper member of the Xiali Fm. (the upper Xiali Fm.) formed under an arid climate and evolved into the sulfate phase or early chloride phase. Provenance proxies based on the obviously increased K+ and Na+ ion concentrations and the significant correlation?coefficient of Na+-Cl? (R = 0.8974) suggest that the upper Xiali Fm. featured optimal provenance conditions for the possible formation of halite deposits. The regression and the semi-closed tidal?flat environment in the upper Xiali Fm. were favorable for the formation of potash and halite deposits. The low Mg2+ /Ca2+ values (mean value = 1.82) and significant Na+-Cl? correlation?coefficient (R = 0.8974) also suggest that the upper Xiali Fm. is the layer most likely to contain potential halite deposits. In addition, the macroscopic correlations of tectonism, provenance, paleoclimate, saliferous strata and sedimentary?environment between the QB and the adjoining Amu Darya Basin in Central Asia reveal that the two basins shared similar geologic settings that were favorable for the formation of evaporites during the Late Jurassic. Therefore, the upper Xiali Fm. is a valuable layer to explore for halite deposit and may be potentially valuable in the future exploration for potash deposits in the QB.
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| 关 键 词： | Evaporites geochemistry Late Jurassic Xiali Formation Qiangtang Basin |
| 修稿时间： | 2003/5/16 0:00:00 |
Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation,Qiangtang Basin: Evidence from Geochemistry Records |
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| Authors: | SONG Chunhui ZENG Yongyao YAN Maodu FANG Xiaomin FENG Ying PAN Jiaqiu LIU Xifang MENG Qingquan HU Chunhua and ZHONG Sirui |
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| Institution: | 1. School of Earth Sciences & Key Laboratory of Western China's Mineral Resources of Gansu Province, Lanzhou University, China;2. Lanzhou Resources & Environment Voc‐Tech College, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences & Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese of Academy of Sciences, China;4. Institute of Mineral Resources, Chinese Academy of Geological Sciences & Key Laboratory of Saline Lake Resources and Environment, Ministry of Land and Resources, China |
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| Abstract: | The Qiangtang Basin(QB), located in the central Tibetan Plateau, is a Jurassic marine basin and one of the most important prospective salt resource belts in China. In recent decades, many outcrops of gypsiferous bed have been found in the Jurassic marine strata in the basin. Salt springs with abnormally high sodium(Na~+) contents had been identified in the Late Jurassic Xiali Formation(Fm.) in the basin in the last years. However, to date, no potash or halite deposits have been identified in the QB. Gypsum outcrops and salt springs are very important signs in the investigation of halite and potash deposits. Therefore, the Xiali Fm. is a potentially valuable layer to evaluate for the possible presence of halite and potash deposits in the basin. However, few studies have explored the formation conditions of evaporites in the unit. Here, we present detailed geochemical records from the Yanshiping section related to the study of the formation conditions of evaporites in the Xiali Fm. of the QB. Climate proxies based on the obviously increased anion concentrations of SO_4(2-) and Cl~- and the significant correlation coefficients of Ca2+-SO42-(R = 0.985) and Na~+-Cl~-(R = 0.8974) reveal that the upper member of the Xiali Fm.(the upper Xiali Fm.) formed under an arid climate and evolved into the sulfate phase or early chloride phase. Provenance proxies based on the obviously increased K~+ and Na~+ ion concentrations and the significant correlation coefficient of Na~+-Cl~-(R = 0.8974) suggest that the upper Xiali Fm. featured optimal provenance conditions for the possible formation of halite deposits. The regression and the semi-closed tidal flat environment in the upper Xiali Fm. were favorable for the formation of potash and halite deposits. The low Mg~(2+) /Ca~(2+) values(mean value = 1.82) and significant Na~+-Cl~- correlation coefficient(R = 0.8974) also suggest that the upper Xiali Fm. is the layer most likely to contain potential halite deposits. In addition, the macroscopic correlations of tectonism, provenance, paleoclimate, saliferous strata and sedimentary environment between the QB and the adjoining Amu Darya Basin in Central Asia reveal that the two basins shared similar geologic settings that were favorable for the formation of evaporites during the Late Jurassic. Therefore, the upper Xiali Fm. is a valuable layer to explore for halite deposit and may be potentially valuable in the future exploration for potash deposits in the QB. |
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| Keywords: | Evaporites geochemistry Late Jurassic Xiali Formation Qiangtang Basin |
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