Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf

LI Xi-shuang; LI San-zhong; LIU Bao-hua; ZHAO Yue-xia

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LI Xi-shuang, LI San-zhong, LIU Bao-hua, ZHAO Yue-xia. Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf[J]. Haiyang Xuebao, 2006, 28(1): 77-84.

Citation:

LI Xi-shuang, LI San-zhong, LIU Bao-hua, ZHAO Yue-xia. Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf[J]. Haiyang Xuebao, 2006, 28(1): 77-84.

LI Xi-shuang, LI San-zhong, LIU Bao-hua, ZHAO Yue-xia. Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf[J]. Haiyang Xuebao, 2006, 28(1): 77-84.

Citation:

LI Xi-shuang, LI San-zhong, LIU Bao-hua, ZHAO Yue-xia. Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf[J]. Haiyang Xuebao, 2006, 28(1): 77-84.

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Geometries and mechanism of folds in sediments on the southern Huanghai Sea shelf

1.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;State Oceanic Administration Key Laboratory of Marine Sedimentology & Environmental Geology, Qingdao 266061, China;Earth Science College, Ocean University of China, Qingdao 266003, China
2.
Earth Science College, Ocean University of China, Qingdao 266003, China
3.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;State Oceanic Administration Key Laboratory of Marine Sedimentology & Environmental Geology, Qingdao 266061, China
4.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Earth Science College, Ocean University of China, Qingdao 266003, China

Received Date: 2005-03-02
Rev Recd Date: 2005-10-11

Abstract

Abstract

Since Pleistocene tectonic activities are intensive,and about 100 to 300 m thick sediments are deposited on the southern Huanghai Sea(SHS) shelf.So fold deformations in the sediments are well presevered.Three types of folds with different geometries in the sediments have been revealed by single-channel seismic profiles on the SHS shelf and they are(1) faul-trelated fold(including faul-tpropagation fold and faul-tdrag fold),(2) transversal bending fold,and(3) multiaction-folding fold.Studies on geometry and mechanism of folds show that it is base faults and fault blocks that control foldings in unconsolidated sediments on the SHS shelf.Large quantity of pore water in the sediments plays an important role in the deformation of sediment layers.The continuity of deformations of the fault-propagation fold and the faultdrag fold indicates that there is genesis relationship between them.Potential earthquakes induced by the faul-tpropagation folding and the deformation zone should be taken into account in the marine engineering geology evaluating of the SHS shelf.
- SHS shelf,
- sediments,
- folding,
- base fault,
- marine engineering

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References(40)

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