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长江三角洲泥丘构造的发现及其意义
陈中原1,2, 许世远1,2
1.华东师范大学地理系 上海;200062
摘要:
利用浅地层剖面仪和钻孔，在1982－1983年对全新世长江水下三角洲的演化进行调查。结果表明，在现代河口沉降中心前缘东南方60－80km的浅海地区，存在着若干泥丘构造。泥丘构造田晚更新世沉积物组成，有些正在顶起上部全新统地层，有些则已出震海底达20多米。调查资料证实，这些泥丘构造的形成，主要是由于长江河口沉降中心的沉积物重力压实作用所致。
关键词:  泥丘构造  沉降  长江三角洲
DOI：
分类号:
基金项目:国家教委回国人员资助项目
DISCOVERY AND SIGNIFICANCE OF MUD DIAPIR STRUCTURE IN THE CHANGJIANG DELTA
Chen Zhongyuan,Xu Shiyuan
Department of Geography, East China Normal University, Shanghai 200062
Abstract:
Seismic profiling and coring in 1982 - 1983 revealed that the mud diapirs in the subaqueous Changjiang delta region are uplifting and disturbing the overlying Holocene sediment and have penetrated completely through the sea-floor. These mud diapirs, mainly composed of late Pleistocene sediment are distributed 60 – 80 km southeast of the Changjiang River Estuary and are located in the right front of the Recent Changjiang depocenter. The relationship of the spatial distribution between the mud diapirs and the Changjiang depocenter indicates that subsidence largely caused by sediment compaction within the depocenter is the key process originating the mud diapirs.
Key words:  Mud diaper, Subsidence, Changjiang delta
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