Clay mineral distribution in surface sediments of the northeastern South China Sea and surrounding fluvial drainage basins: Source and transport
Clay mineral distribution in surface sediments of the northeastern South China Sea and surrounding fluvial drainage basins: Source and transport
复制标题
南海东北部及周边河流流域表层沉积物中粘土矿物分布：来源与输送
DOI：
10.1016/j.margeo.2010.08.010
复制
发表时间：
2010-11-15
期刊：
影响因子：
2.9
通讯作者：
Huang, Kuo-Fang
中科院分区：
文献类型：
--
作者：
Liu, Zhifei;Colin, Christophe;Huang, Kuo-Fang
通过对南海东北部及周边河流流域表层样品的粘土矿物学研究，揭示了碎屑细粒沉积物的来源和运移规律。粘土矿物组成的三个特征端员观察到从三个主要的物源，分别是：主要高岭石和中等伊利石和伊利石从珠江，主要伊利石和伊利石从台湾，和主要蒙皂石从吕宋岛弧系统。四种粘土矿物在南海东北部的运移受多种机制的影响。吕宋岛弧系统中的蒙皂石主要受表层流的搬运，黑潮入侵影响显著;台湾地区的伊利石和高岭石主要受深水流的搬运，珠江流域的高岭石受向西沿岸流和沿岸流的影响显著。在东部陆架，以台湾为主要来源的高含量伊利石和伊利石的西风舌状分布可能是冬季向西沿岸流的结果。结果表明，南海东北部粘土矿物组合主要受物源补给和海流输运的控制，其岩芯记录不具有同期的古气候特征。粘土矿物对晚第四纪东亚季风演化的指示作用是通过物源补给和海流输运两个过程实现的。(C)2010 Elsevier BV保留所有权利。
Clay mineralogy of surface samples throughout the northeastern South China Sea (SCS) and surrounding fluvial drainage basins has been investigated to reveal source and transport of detrital fine-grained sediments. Three characteristic end-members in clay mineral compositions were observed from three major provenances, respectively: major kaolinite and moderate illite and chlorite from the Pearl River, predominant illite and chlorite from Taiwan, and principal smectite from the Luzon arc system. The transport of four clay mineral species in the northeastern SCS is influenced by various mechanisms. Smectite derived from the Luzon arc system is transported mainly by surface current with significant influence of the Kuroshio intrusion, illite and chlorite from Taiwan are mainly carried by deep water current, while kaolinite from the Pearl River is affected obviously by the westward Guangdong Coastal Current and longshore current. A westerly tongue-shaped distribution of high contents of illite and chlorite mainly from Taiwan on the eastern shelf may result from the westward Guangdong Coastal Current during the winter. The results suggest that clay mineral assemblages in the northeastern SCS are mainly controlled by provenance supply and current transport and their downcore records do not bear contemporaneous paleoclimatic features. The implication of clay minerals for proxies of the late Quaternary East Asian monsoon evolution is realized through both the provenance supply and current transport processes. (C) 2010 Elsevier B.V. All rights reserved.