渐新世以来南海北部陆坡区沉积演化及其对构造的响应

IOCAS-IR > 海洋地质与环境重点实验室

	渐新世以来南海北部陆坡区沉积演化及其对构造的响应
	李安春; 黄杰; 蒋恒毅; 万世明
	2011
发表期刊	地球物理学报
ISSN	0001-5733
卷号	54.0 期号:12 页码:3233-3245
摘要	通过对南海北部陆坡下部ODP1148站位沉积物中陆源矿物组分的含量、堆积速率、粒度、石英氧同位素及石英扫描电镜的分析,探讨南海沉积演化及其构造响应.结果显示,根据综合指标的变化特征可将南海海盆的沉积演化划分为5个阶段:扩张初期(34～28.5 Ma)、构造活动剧烈期(28.5～23 Ma)、构造活动减弱期(23～16.5 Ma)、热沉降期(16.5～3.5 Ma)和台湾隆升形成期(3.5 Ma～现今).其中28.5～23 Ma为物源转换期,陆源矿物组成和石英氧同位素值发生了明显改变,对应南海渐新世以来演化过程中构造活动最为活跃的时期.在此之前的渐新世南海扩张初期,研究区的沉积物主要来源于南部(...
其他摘要	We here reconstruct the sedimentary evolution of South China Sea since Oligocene using samples from Ocean Drilling Program （ODP） site 1148 in the northern South China Sea based on a multi-proxy approach including monomineralic quartz oxygen isotope ratios （δ18 O）, grain-size of isolated terrigenous materials, terrigenous mineral accumulation rate and SEManalysis of isolated quartz. It was found that the sedimentary evolution of South China Sea Basin could be divided into five stages, period of initial expansion （34-28.5 Ma）, period of intense tectonic activity （28.5-23 Ma）, period of reduced tectonic activity （23-16.5 Ma）,period of thermal subsidence （16.5-3.5 Ma） and period of Taiwan uplift （3.5 Ma to present）. Terrigenous mineral composition and oxygen isotope values of quartz altered significantly during 28.5-23 Ma which was the period of provenance transition, corresponding to the most active period of South China Sea since Oligocene. Sediment source of ODP Site 1148 was mainly from Palawan during the early spreading period of South China Sea. With the extensive spreading of South China Sea, especially when the spreading axes of South China Sea jump to south during 25-23 Ma, Palawan continental block moved away constantly, and the changes in the regional geomorphic change caused by Tibetan Plateau uplift had not spread to Yunnan-Guizhou Plateau and South China, so Southern China mainland in the north had little or no impact on the study area, as a result, terrigenous mass accumulation rate was very low. Subsequently, owing to the rapid uplift of Qinghai-Tibet Plateau, rivers such as Pearl River developed gradually, so did the headward erosion, as a result, South China turned to be the main source of ODP site 1148, and South China Sea converted to distal deposition. With Taiwan Island uplift since 3.5 Ma, a large amount of terrigenous sediments entered into the northern South China Sea, Taiwan turned to be the major source provenance of the study area. The hiatus of ODP site 1148 in the late Oligocene resulted from the lack of terrigenous material supply, sea level rise and relatively stronger currents during the source transformation.
关键词	南海 Odp1148站渐新世石英氧同位素比值陆源矿物物源
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:4415163
引用统计	被引频次：12[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/12649
专题	海洋地质与环境重点实验室
推荐引用方式 GB/T 7714	李安春,黄杰,蒋恒毅,等. 渐新世以来南海北部陆坡区沉积演化及其对构造的响应[J]. 地球物理学报,2011,54.0(12):3233-3245.
APA	李安春,黄杰,蒋恒毅,&万世明.(2011).渐新世以来南海北部陆坡区沉积演化及其对构造的响应.地球物理学报,54.0(12),3233-3245.
MLA	李安春,et al."渐新世以来南海北部陆坡区沉积演化及其对构造的响应".地球物理学报 54.0.12(2011):3233-3245.

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