Reconstruction of silicate weathering intensity and paleoenvironmental change during the late Quaternary in the Zhuoshui River catchment in Taiwan
Reconstruction of silicate weathering intensity and paleoenvironmental change during the late Quaternary in the Zhuoshui River catchment in Taiwan
复制标题
台湾浊水河流域晚第四纪硅酸盐风化强度与古环境变化重建
DOI：
10.1016/j.quaint.2016.12.013
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发表时间：
2017-09
影响因子：
2.2
通讯作者：
Chang Yuan-pin
中科院分区：
文献类型：
--
作者：
Zhao Yun;Yang Shouye;Liu James T.;Fan Daidu;Yang Rick J.;Bi Lei;Chang Yuan-pin
台湾岛因其独特的地质、地理和气候背景，是世界上研究晚第四纪地表过程最好的地区之一。本文利用浊水三角洲JRD-S钻孔的沉积和元素地球化学资料，研究末次冰期以来沉积物物源区和硅酸盐风化强度随季风气候变化的变化。浊水沉积物的稀土元素组成与现代浊水沉积物相似，表明浊水流域是浊水河口区晚第四纪沉积物的主要物源，而长江等中国东南部内陆河流可能不是浊水河口区晚第四纪沉积物的主要物源。由于沉积物物源稳定，浊水流域晚第四纪硅酸盐风化强度的变化主要受活动构造背景下的季风气候驱动。末次冰期较弱的季风降水导致山区流域侵蚀较弱（从而减少泥沙供应），从而增加了泥沙停留时间和硅酸盐风化强度。相反，全新世季风降水的增强可能大大增加了物理侵蚀和沉积物从陆地向海洋的转移速率，从而产生更多的风化程度较低的沉积物。本研究提供了深入的见解，沉积响应构造和季风气候变化在第四纪期间的构造活动的高地位的岛屿，这增加了我们更好地了解地球表面过程中的独特大陆边缘。
Taiwan Island is one of the best places in the world for the study of earth surface processes during the late Quaternary because of its unique geological, geographic and climatic settings. In this study, we present sedimentary and element geochemical data of Core JRD-S drilled on the Zhuoshui River Delta, aiming to examine the changes of sediment provenance and silicate weathering intensity in response to monsoon climate variability since the last glacial period. Similar rare earth element (REE) compositions between the core sediments and modern Zhuoshui River samples suggest the Zhuoshui watershed was the dominant sediment provenance for the late Quaternary deposition in the river mouth, while the mainland rivers in southeast China including the Changjiang (Yangtze River) could not be the major sediment suppliers. Due to the stable sediment provenance, the geochemical proxy of the core sediments reveals the change of silicate weathering intensity during the late Quaternary in the Zhuoshui watershed was primarily driven by monsoon climate under an active tectonic setting. The weaker monsoonal precipitation in the last glaciation caused weaker erosion (thus less sediment supply) in the mountainous watershed and thus, increased the sediment residence time and silicate weathering intensity. In contrast, the enhanced Holocene monsoonal precipitation might greatly increase the physical erosion and sediment transfer rate from land to sea, which consequently produced more less-weathered sediments. This study provides in-depth insights into sedimentary response to tectonic and monsoon climatic changes during the Quaternary on a tectonically active high-standing island, which increases our better understanding of earth surface processes in the unique continental margin.
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东海济州岛西南部末次冰消期和全新世沉积物物源判别
影响因子：
3
作者：
Dou Yanguang;Yang Shouye;Lim Dhong-Il;Jung Hoi-Soo
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影响因子：
13.6
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作者：
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SANTOS, UD
DOI：
10.4236/jmp.2015.611164
发表时间：
2015-09
期刊：
Journal of Modern Physics
影响因子：
--
作者：
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通讯作者：
B. Saikia;S. R. Goswami;R. Borthakur;I. B. Roy;R. R. Borah-R.