baishui剖面两个粒级(<5mm，5-20mm)的分析化学蚀变指数和主量元素丰度数据

甘肃白水剖面红粘土序列的主量元素化学分析表明，从CIA推断的化学风化强度（化学蚀变指数）值逐渐减弱，幅度随着年代的增长而增大。CIA的总体趋势可与深海沉积物的氧同位素变化相关联。多个粒级的分析表明CIA和主量元素丰度具有强烈的粒度依赖性。所有三种粒级的化学交替相对较弱，并且红粘土的化学组成的长期变化主要受来自不同源区的新鲜碎屑的混合控制。

Major elemental chemical analyses of the red clay sequence at the Baishui section in Gansu Province indicate that the chemical weathering intensity, inferred from the Chemical Index of Alteration (CIA), gradually decreases, with the magnitude of this reduction increasing with rising geological age. The overall trend of CIA correlates with the oxygen isotope variations in deep-sea sediments. Analyses of multiple grain size fractions reveal that both CIA and the abundances of major elements exhibit strong grain size dependence. Chemical alteration is relatively weak for all three grain size fractions, and the long-term variations in the chemical composition of the red clay are primarily controlled by the mixing of fresh detrital materials from different source regions.

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背景概述

该数据集包含甘肃白水剖面红粘土序列两个粒级(<5mm和5-20mm)的化学蚀变指数和主量元素丰度数据，用于分析化学风化强度变化。数据显示化学风化强度随年代增长而减弱，且与深海沉积物氧同位素变化相关；CIA和主量元素丰度具有强烈的粒度依赖性，化学交替相对较弱，长期变化主要受源区碎屑混合控制。