Clay mineral evolution in the central Okinawa Trough since 28 ka: Implications for sediment provenance and paleoenvironmental change
Clay mineral evolution in the central Okinawa Trough since 28 ka: Implications for sediment provenance and paleoenvironmental change
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28 ka以来冲绳海槽中部粘土矿物演化：对沉积物来源和古环境变化的影响
DOI：
10.1016/j.palaeo.2010.01.040
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发表时间：
2010-03
期刊：
影响因子：
--
通讯作者：
Shi, Xuefa
中科院分区：
文献类型：
--
作者：
Dou, Yanguang;Yang, Shouye;Liu, Zhenxia;Clift, Peter D.;Yu, Hua;Berne, Serge;Shi, Xuefa
冲绳海槽是研究晚第四纪陆海相互作用和古环境变化的天然实验室。在这项研究中，我们重建的粘土矿物组合的演化DGKS 9604从中央冲绳海槽取回。粘土矿物组成以伊利石为主，平均含量在60%以上。28 ka以来的粘土矿物演化与沉积物源区和古环境的变化密切相关。海平面上升和黑潮强度控制了东海陆架和冲绳海槽粘土的分散和沉积，从而决定了柱状沉积物中粘土矿物的组成。末次冰期晚期（28.0-14.0ka），古长江口位于靠近冲绳海槽中部的陆架边缘，与外陆架一起向海槽直接提供了大量陆源沉积物。14.0 ~ 8.4ka，随着海平面上升和长江口西移，长江对冲绳海槽中部的影响减弱，而东海中、外陆架成为冲绳海槽中部的主要沉积物源。15- 13 ka期间，陆棚边缘强烈的沉积物改造和侵蚀显着增加了细粒陆棚沉积物向冲绳海槽中部的侧向输送。因为CA。来自台湾的8.4ka粘土占主导地位的沉积物通量的网站，与黑潮流重新进入槽。1.5ka以来长江源沉积物的影响增强可能与黑潮的减弱和/或较高的河流通量有关。
The Okinawa Trough is a natural laboratory for the study of later Quaternary land–ocean interaction and paleoenvironmental changes. In this study we reconstruct the evolution of clay mineral assemblages in Core DGKS9604 retrieved from the central Okinawa Trough. Illite dominates the clay mineral compositions, with average contents above 60%. Clay mineral evolution since 28ka is closely related to changes in sediment provenance and paleoenvironment. Sea level rise and the strength of the Kuroshio Current control the dispersal and deposition of clays on the East China Sea shelf and in the Okinawa Trough, and thus, determine the clay mineral compositions in the core sediments. During the late last glacial period (28.0–14.0ka), the paleo-Changjiang River mouth was situated at the shelf edge close to the central Okinawa Trough and thus, together with the outer shelf, supplied large volumes of terrigenous sediments directly into the trough. From 14.0 to 8.4ka influence from the Changjiang decreased while the mid-outer shelf of the East China Sea became the dominant sediment source to the central Okinawa Trough as sea level rose and the Changjiang river mouth migrated west. Strong sediment reworking and erosion at the shelf edge at 15–13ka significantly increased the lateral transport of fine-grained shelf sediments to the central Okinawa Trough. Since ca. 8.4ka clays from Taiwan have dominated the sediment flux to the site, coinciding with the re-entry of the Kuroshio Current into the trough. The increasing influence of the Changjiang-sourced sediments since 1.5ka was probably related to the weakening of the Kuroshio Current and/or a higher river flux.
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DOI：
10.1007/978-3-642-80353-6_31
发表时间：
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期刊：
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影响因子：
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2001-12
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Palaeogeography, Palaeoclimatology, Palaeoecology
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10.1144/gsl.sp.2003.219.01.04
发表时间：
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