南海南部陆缘礼乐盆地新生代的构造—沉积特征及伸展机制: 来自NH973-2多道地震测线的证据

丁巍伟; 李家彪; 黎明碧

doi:10.3799/dqkx.2011.094

Volume 36 Issue 5

Sep. 2011

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DING Wei-wei, LI Jia-biao, LI Ming-bi, 2011. Seismic Stratigraphy, Tectonic Structure and Extension Model Across the Reed Bank Basin in the South Margin of South China Sea: Evidence from NH973-2 Multichannel Seismic Profile. Earth Science, 36(5): 895-904. doi: 10.3799/dqkx.2011.094

Citation:

DING Wei-wei, LI Jia-biao, LI Ming-bi, 2011. Seismic Stratigraphy, Tectonic Structure and Extension Model Across the Reed Bank Basin in the South Margin of South China Sea: Evidence from NH973-2 Multichannel Seismic Profile. Earth Science, 36(5): 895-904. doi: 10.3799/dqkx.2011.094

Citation:

DING Wei-wei, LI Jia-biao, LI Ming-bi, 2011. Seismic Stratigraphy, Tectonic Structure and Extension Model Across the Reed Bank Basin in the South Margin of South China Sea: Evidence from NH973-2 Multichannel Seismic Profile. Earth Science, 36(5): 895-904. doi: 10.3799/dqkx.2011.094

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Seismic Stratigraphy, Tectonic Structure and Extension Model Across the Reed Bank Basin in the South Margin of South China Sea: Evidence from NH973-2 Multichannel Seismic Profile

doi: 10.3799/dqkx.2011.094

DING Wei-wei^{1, 2
,},
LI Jia-biao^{1, 2},
LI Ming-bi^{1, 2}

1.
Key Laboratory of the Sub-marine Geosciences, State Oceanic Administration, Hangzhou 310012, China
2.
The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2011-04-30
Publish Date: 2011-09-15

Abstract

Abstract

One recently acquired regional multi-channel seismic profile (NH973-2) across the Reed Bank basin, the South China Sea (SCS), is interpreted.Based on the interpretations of these profiles, we have worked out its stratigraphic sequences, tectonic structures and extension factors.Four tectonic-stratigraphic units are determined, together with 6 sequence boundaries.Detailed analyses on the extension factors based on the measurement of fault heaves reveal two episodes of continental extension separated by a distinct unconformity.The main extension occurred during the continental rifting (Early Tertiary), and resulted in the formation of half-grabens and rotated blocks, controlled by deeply rooted detachment system.During the second extension phase (drifting period, Late Oligocene-Early Miocene) intensity reduced sharply and focused on the continental-oceanic transition area.A widespread carbonate platform developed across the Reed bank region concurrent with the drifting period of the SCS.Fault-related stretching factor (β_f) is found to be comparable and shows discrepancy with the whole crust stretching factors (β_c) in the study area.Thus we conclude that the continental crust of the Reed Bank basin experienced depth-dependent extension.
- Reed Bank basin,
- stratigraphy,
- tectonics,
- stretching factors,
- marine geology

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References(50)

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