内特拉瓦蒂河悬浮沉积物和泥质沉积物之间的地球化学分裂:半岛片麻岩和德干玄武岩沉积物成分相似性的启示及其对印度洋产地追踪的影响

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-07-11 DOI:10.1029/2024GC011642
G. P. Gurumurthy
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引用次数: 0

摘要

对热带山地河流沉积物的主要、痕量和稀土元素地球化学进行了研究,以了解化学元素在半岛片麻岩地形中风化和迁移过程中的行为。研究结果与德干玄武岩河流沉积物和阿拉伯海东部沉积物进行了比较,旨在强调与印度大陆边缘沉积物来源确定相关的挑战。内特拉瓦蒂河悬浮颗粒物质(SPM)和泥质沉积物(63 μm)的地球化学特征表明,沉积物来源于相对单一的岩性,其特征是由碳酸盐岩(低铝 TTGs)组成的中间岩。根据沉积物地球化学特征判别的源岩构造起源表明,沉积物起源于海洋岛弧。沉积物在源区经历了强烈的化学风化作用。元素组成及其元素间的关系表明,矿物相的不同化学风化分馏出 SPM 中的岩浆岩成分及其次生矿物产物,以及泥质沉积物中以长岩成分及其次生矿物产物为主的混合源。强烈的化学风化作用导致悬浮沉积物和泥质沉积物之间出现明显的地球化学分裂。从印度半岛到大洋的黑云母沉积物的迁移,以及与德干玄武岩沉积物的地球化学相似性,使得使用传统的元素地球化学方法沿印度大陆边缘追踪半岛片麻岩沉积物来源具有挑战性。本研究的推论对确定印度大陆边缘沉积物的来源具有重要意义。
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Geochemical Split Among the Suspended and Mud Sediments in the Nethravati River: Insights to Compositional Similarity of Peninsular Gneiss and the Deccan Basalt Derived Sediments, and Its Implications on Tracing the Provenance in the Indian Ocean

Major, trace, and rare earth element (REE) geochemistry of sediments from a tropical mountain river is investigated to understand the behavior of chemical elements during weathering and transportation in a Peninsular Gneissic terrain. The results from this study are compared with the Deccan Basalt-derived River sediments and the eastern Arabian Sea sediments with an intent to highlight the challenges associated with the provenance determination of sediments along the continental margin of India. The geochemistry of suspended particulate matter (SPM) and mud sediments (<63 μm) of the Nethravati River indicate that sediments are derived from a relatively homogenous lithology, characterized by intermediate rocks of tonalitic (low-Al TTGs) composition. The tectonic origin of the source rocks discriminated using sediment geochemistry suggests an ocean island arc origin. The sediments experience intense chemical weathering in the source region. The elemental composition and their inter-element relationships suggest differential chemical weathering of mineral phases fractionate mafic components and their secondary mineral products in SPM, and mixed sources dominated by felsic components and their secondary mineral products in mud sediments. Intense chemical weathering induces significant geochemical splits among the suspended and mud sediments. The transport of mafic-biased sediments from Peninsular India to Oceans, and the geochemical similarity with Deccan Basalt-derived sediments makes it challenging to track the Peninsular Gneiss-derived sediment provenance along the continental margin of India using conventional elemental geochemistry. The inferences from this study have important implications for determining the sediment provenance along the continental margin of India.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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