Grain-size and compositional variability of Yarlung Tsangpo sand (Xigaze transect, south Tibet): Implications for sediment mixing by fluvial and aeolian processes

doi:10.1016/j.jop.2023.01.002

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Abstract

Studying the grain-size dependent compositional variability in modern river sediments provides a key to decipher the information stored in the sedimentary archive and reconstruct the evolution of the Earth's surface in the past. Bedload sand along the Xigaze cross section of the Yarlung Tsangpo (upper Brahmaputra River) ranges in mean grain size from 0.72 Φ to 3.21 Φ, is moderately to poorly sorted and slightly platykurtic to moderately leptokurtic with sub-angular to sub-spherical grains. Litho-feldspatho-quartzose to feldspatho-litho-quartzose sand (Q 43%-65%; F 13%-44%; L 11%-28%) contains 3.4% to 14.4% heavy minerals including amphibole (64%-89%), epidote (4%-11%), chloritoid (0-10%), and clinopyroxene (2%-6%). The marked textural and compositional variability observed across the Xigaze transect of the Yarlung Tsangpo mainstem is controlled by both fluvial and aeolian processes, including repeated reworking by westerly and glacial winds, as well as by local contributions from northern and southern tributaries draining the Lhasa Block and the Himalayan Belt, respectively. The modern sedimentary case here will shed new light on interpreting paleogeography and provenance.

Key words： Modern fluvial sediments Sand petrography Heavy minerals Fluvial/aeolian interactions End-member grain-size modeling Lhasa Block Himalayan Belt

Received: 05 September 2022

Corresponding Authors: ^*State Key Laboratory of Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu Province, China. E-mail address: huxm@nju.edu.cn (X.-M. Hu).

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