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Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation,Qiangtang Basin:Evidence from Geochemistry Records 预览

Sedimentary Conditions of Evaporites in the Late Jurassic Xiali Formation,Qiangtang Basin:Evidence from Geochemistry Records
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摘要 Qiangtang 盆(QB ) ,在中央西藏的高原定位了,是侏罗记水兵盆,最重要的未来的盐资源之一在中国系上带子。在最近的十年, gypsiferous 床的许多露头在盆在侏罗记海洋的阶层被发现了。有反常地高的钠的盐弹簧(Na <sup>+</sup>) 内容在最后年里在盆在迟了的侏罗记 Xiali 形成(Fm ) 被识别了。迄今为止,然而,没有钾碱或岩盐存款在 QB 被识别了。石膏露头和盐弹簧是在岩盐和钾碱存款的调查的很重要的符号。因此, Xiali Fm。是潜在地珍贵的层在盆为岩盐和钾碱存款的可能的存在评估。然而,很少研究在单位探索了 evaporites 的形成条件。这里,我们从与在 Xiali Fm 的 evaporites 的形成条件的学习有关的 Yanshiping 节的现在的详细 geochemical 记录。QB。气候基于显然增加的阴离子集中代理那么 <sub>4</sub><sup>2</sup> 和 Cl <sup></sup> 和 Ca <sup>2+</sup>-SO<sub>4</sub><sup>2</sup><sup></sup> 的重要关联系数(R = 0.985 ) 并且 Na <sup>+</sup>-Cl<sup></sup>(R = 0.8974 ) 揭示 Xiali Fm 的上面的成员。(上面的 Xiali Fm ) 在干旱气候下面形成了并且演变为硫酸盐阶段或早氯化物阶段。起源基于显然增加的 K <sup>+</sup> 和 Na <sup>+</sup> 离子集中和 Na <sup>+</sup>-Cl<sup></sup> 的重要关联系数代理(R = 0.8974 ) 建议上面的 Xiali Fm。为岩盐存款的可能的形成的展示最佳的起源条件。在上面的 Xiali Fm 的回归和关上半的潮汐的扁平的环境。为钾碱和岩盐存款的形成是有利的。低 Mg <sup>2+</sup>/Ca <sup>2+</sup> 价值(吝啬的价值 = 1.82 ) 并且重要 Na <sup>+</sup>-Cl<sup></sup> 关联系数(R = 0.8974 ) 也建议上面的 Xiali Fm。很可能是层包含潜在的岩盐存款。另外,在在中亚的 QB 和毗连的原子量 Darya 盆之间的 tectonism,起源,古气候,产盐的阶层和沉积环境的宏观的关联表明二盆分享了在迟了的侏罗记期间为 evaporites 的形成是有利的类似 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 SO4(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
作者 SONG Chunhui ZENG Yongyao YAN Maodu FANG Xiaomin FENG Ying PAN Jiaqiu LIU Xifang MENG Qingquan HU Chunhua ZHONG Sirui Chunhui SONG[1]; Yongyao ZENG[1,3]; Maodu YAN[2]; Xiaomin FANG[2]; Ying FENG[1]; Jiaqiu PAN[1]; Xifang LIU[4]; Qingquan MENG[1]; Chunhua HU[1]; Sirui ZHONG[1]
出处 《地质学报:英文版》 SCIE CAS CSCD 2017年第1期156-174,共19页 Acta Geologica Sinica
基金 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)
关键词 地球化学记录 晚侏罗世 蒸发岩 夏利 沉积条件 岩盐矿床 海相盆地 负离子浓度 Evaporites geochemistry Late Jurassic Xiali Formation Qiangtang Basin
作者简介 Corresponding author. SONG Chunhui: Male, born in 1959. Doctor Song Chunhui is currently a geology professor at the School of Earth Sciences in Lanzhou University. His current research interest focuses on the synthetic study of the uplift of the Tibetan Plateau and the driving mechanisms of the aridification of inland Asia.E-mail: songchh@lzu.edu.cn
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