塔尔印度大沙漠大范围沙质表层沉积物的地球化学和放射性 Sr-Nd 同位素特征:对产地研究的启示

IF 3.5 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Geophysical Research: Earth Surface Pub Date : 2024-07-30 DOI:10.1029/2023JF007625
Rohan Bhattacharyya, Satinder Pal Singh, Abul Qasim, Azad Kashyap Chandrashekhar
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引用次数: 0

摘要

了解大沙漠的形成/演变对区域乃至全球沙尘循环的影响仍然是一项挑战。本研究介绍了从印度西北部广布的超干旱塔尔沙漠采集的 51 个地表沉积物样本的地球化学和钍钕同位素组成。研究的主要目的是确定沉积物的来源,以便更好地了解印度大沙漠的形成/演变机制以及喜马拉雅山的下风向沙尘贡献。成分不成熟的沙质塔尔沉积物(CIA ∼50 ± 4,WIP ∼49 ± 12,EuN/Eu* ∼0.80 ± 0.13)是来自喜马拉雅造山运动的再循环材料,后经石英添加和重矿物贫化/分选过程而改变。大部分塔尔沉积物中的 87Sr/86Sr (0.7259 ± 0.0012) 和 εNd (-12.5 ± 2.7) 与早先公布的印度西北部风化砂沉积物成分不同。从暴露在不同岩性(第四纪冲积层与第三纪和中生代沉积层)上的不同沙丘类型中采集的塔尔沉积物子类别在地球化学和同位素方面没有区别,这表明它们具有同源来源和/或沉积物再加工。本研究收集的塔尔河沉积物主要来自印度河,上风向的加加尔-哈克拉古河道也为其提供了大量沉积物。印度河沉积物很可能是在远古至近代的低海平面时期以及脱冰期之后从陆架地区暴露出来的风蚀沉积物。考虑到新的和已公布的数据集,沉积在喜马拉雅山正面冰川中的尘埃的 Sr-Nd 同位素预算表明,来自喜马拉雅山附近的上风印度-甘地平原的大气矿物尘埃与来自遥远的天然沙漠的尘埃相当。
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Geochemical and Radiogenic Sr-Nd Isotope Characterization of Widespread Sandy Surface Sediments in the Great Indian Desert, Thar: Implications for Provenance Studies

Understanding large desert formation/evolution contributing to regional-to-global dust cycles remains a challenge. This study presents the geochemical and Sr-Nd isotope compositions of 51 surface sediment samples collected from the widespread hyper-arid Thar Desert in northwestern India. The major objective is to determine sediment provenance for a better understanding of the formation/evolution mechanism of this Great Indian Desert as well as downwind dust contributions toward the Himalayas. The compositionally immature sandy Thar sediments (CIA ∼50 ± 4, WIP ∼49 ± 12, and EuN/Eu* ∼0.80 ± 0.13) are recycled materials derived from the Himalayan orogen and later modified by quartz addition and heavy mineral depletion/sorting processes. The 87Sr/86Sr (0.7259 ± 0.0012 and εNd (−12.5 ± 2.7) in the bulk of these Thar sediments are different from the earlier published compositions of the eolian sand deposits in northwestern India. The subcategories of Thar materials collected from different dune types exposed over different lithologies (Quaternary alluvium vs. Tertiary and Mesozoic sedimentary formations) are geochemically and isotopically indistinguishable, which indicates their cogenetic sources and/or sediment reworking. Thar sediments collected in this study have a predominant Indus origin along with significant contributions from the upwind Ghaggar-Hakra paleochannels. The Indus sediments are most likely wind-eroded from the shelf region exposed during the low sea stand of LGM and afterward deglaciation. Considering the new and published data sets, the Sr-Nd isotope budget of dust deposited in the Himalayan frontal glaciers indicates that atmospheric mineral dust contribution from the upwind Indo-Gangetic Plain proximal to the Himalayas is at par with dust parcels from distant natural deserts.

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来源期刊
Journal of Geophysical Research: Earth Surface
Journal of Geophysical Research: Earth Surface Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
6.30
自引率
10.30%
发文量
162
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