气候变化领域集成服务门户(CCPortal): Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation, Qiangtang Basin: Evidence from Geochemistry Records

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DOI	10.1111/1755-6724.13069
	Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation, Qiangtang Basin: Evidence from Geochemistry Records
	Song, Chunhui; Zeng, Yongyao; Yan, Maodu; Fang, Xiaomin; Feng, Ying; Pan, Jiaqiu; Liu, Xifang; Meng, Qingquan; Hu, Chunhua; Zhong, Sirui
通讯作者	Song, CH (通讯作者)
发表日期	2017
ISSN	1000-9515
EISSN	1755-6724
起始页码	156
结束页码	174
卷号	91 期号:1
英文摘要	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.
关键词	QINGHAI-TIBET PLATEAU STRONTIUM-ISOTOPE STRATIGRAPHY SOURCE-ROCK KITCHENS MARINE SOURCE ROCKS DINOFLAGELLATE CYSTS SEAWATER CHEMISTRY SECULAR VARIATION BELEMNITE ROSTRA FLUID INCLUSIONS OXYGEN-ISOTOPE
英文关键词	Evaporites; geochemistry; Late Jurassic; Xiali Formation; Qiangtang Basin
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000395768100011
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259046
推荐引用方式 GB/T 7714	Song, Chunhui,Zeng, Yongyao,Yan, Maodu,et al. Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation, Qiangtang Basin: Evidence from Geochemistry Records[J]. 中国科学院青藏高原研究所,2017,91(1).
APA	Song, Chunhui.,Zeng, Yongyao.,Yan, Maodu.,Fang, Xiaomin.,Feng, Ying.,...&Zhong, Sirui.(2017).Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation, Qiangtang Basin: Evidence from Geochemistry Records.ACTA GEOLOGICA SINICA-ENGLISH EDITION,91(1).
MLA	Song, Chunhui,et al."Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation, Qiangtang Basin: Evidence from Geochemistry Records".ACTA GEOLOGICA SINICA-ENGLISH EDITION 91.1(2017).