雅鲁藏布江流域现代河流沉积物碎屑组分、重矿物及地化组分数据集（2001-2019）

本数据集的样品主要采集自2013-2019年，以及零星的2001-2013年的河流沉积物样品，数据集共包含40个干流样品和107个支流样品的采样地点信息，62个河流沉积物样品的碎屑组分数据，145个河流沉积物样品的重矿物数据，以及55个河流沉积物样品的地球化学数据。碎屑组分统计方法为Gazzi-Dickinson方法，选取的组分粒径为63-2000μm；重矿物则是利用重液（2.90 g/cm3）和液氮冷却法从32-500μm的沉积物中提取而来，并利用光学性质及拉曼光谱辅助鉴定统计各重矿物组分，地球化学测试分析对象为<2000μm的砂质沉积物。碎屑组分和重矿物组分数据分别在意大利米兰-比可卡大学和南京大学的实验室完成，地球化学数据由中国地质科学院地球物理地球化学勘察研究所完成，结果真实可靠。本数据集系统反应了雅鲁藏布江流域不同支流、不同构造单元（特提斯喜马拉雅地体、雅鲁藏布江缝合带、拉萨地块等）的沉积物组分，据此可明确藏南地区雅鲁藏布江流域内不同岩性/河流产出的沉积物组分分布特征，为深时的物源分析对比提供参照；同时结合正演混合模型计算，可知雅鲁藏布江流域的砂质沉积物主要来自北侧的拉萨地块，其贡献量了流域内~80%的砂质沉积物，是南侧特提斯喜马拉雅地体贡献量的5倍，而雅鲁藏布江缝合带仅提供了不到5%的砂质沉积物。

The samples comprising this dataset were primarily collected between 2013 and 2019, with sporadic fluvial sediment samples acquired from 2001 to 2013. The dataset contains sampling location information for 40 main stem samples and 107 tributary samples, clastic component data for 62 fluvial sediment samples, heavy mineral data for 145 fluvial sediment samples, and geochemical data for 55 fluvial sediment samples.

Clastic components were counted using the Gazzi-Dickinson method, with selected particle size fractions ranging from 63 to 2000 μm. Heavy minerals were extracted from sediments with particle sizes of 32–500 μm using a heavy liquid (2.90 g/cm³) and liquid nitrogen cooling method, and each heavy mineral component was identified and quantified with the assistance of optical properties and Raman spectroscopy. Geochemical tests were conducted on sandy sediments with particle sizes <2000 μm.

The clastic component and heavy mineral component analyses were performed in the laboratories of the University of Milano-Bicocca (Italy) and Nanjing University, respectively, while the geochemical data were generated by the Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences. All analytical results are reliable and authentic.

This dataset systematically documents sediment components from different tributaries and tectonic units (e.g., Tethyan Himalaya Terrane, Yarlung Zangbo Suture Zone, Lhasa Terrane) within the Yarlung Zangbo River Basin. It enables clarification of the distribution characteristics of sediment components derived from different lithologies or rivers in the Yarlung Zangbo River Basin of southern Tibet, providing a reference for provenance analysis and correlation in deep time. Additionally, combined with forward mixing model calculations, it is determined that sandy sediments in the Yarlung Zangbo River Basin are mainly sourced from the northern Lhasa Terrane, which contributes approximately 80% of the basin's sandy sediments—five times the contribution of the southern Tethyan Himalaya Terrane—while the Yarlung Zangbo Suture Zone provides less than 5% of the sandy sediments.

搜集汇总

背景与挑战

背景概述

该数据集汇集了2001-2019年间雅鲁藏布江流域的现代河流沉积物数据，主要包含40个干流和107个支流样品的采样信息，以及62个碎屑组分、145个重矿物和55个地球化学组分数据，采用Gazzi-Dickinson方法、重液提取和光谱鉴定等技术分析。数据集系统反映了不同构造单元（如拉萨地块、特提斯喜马拉雅地体）的沉积物分布特征，用于物源分析，并揭示砂质沉积物主要来自北侧的拉萨地块，贡献量约占80%。