都龙-Song Chay变质穹隆体变形与构造年代——南海盆地北缘早期扩张作用始于华南地块张裂的证据

颜丹平; 周美夫; 王焰; 汪昌亮; 赵太平

Volume 30 Issue 4

Jul. 2005

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Article Navigation > Earth Science > 2005 > 30(4): 402-412

YAN Dan-ping, ZHOU Mei-fu, WANG Yan, WANG Chang-liang, ZHAO Tai-ping, 2005. Structural Styles and Chronological Evidences from Dulong-Song ChayTectonic Dome: Earlier Spreading of South China Sea Basin due toLate Mesozoic to Early Cenozoic Extension of South China Block. Earth Science, 30(4): 402-412.

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Structural Styles and Chronological Evidences from Dulong-Song ChayTectonic Dome: Earlier Spreading of South China Sea Basin due toLate Mesozoic to Early Cenozoic Extension of South China Block

1.
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3.
Department of Earth Sciences, The University of Hong Kong, Hong Kong SAR, China

Received Date: 2005-02-25
Publish Date: 2005-07-25

Abstract

Abstract

The South China Sea basin expanded firstly from Late Mesozoic to Early Cenozoic,and then at 32-17 Ma.The second stage of extension formed immediately after the first stage,and both extensions are consistent with the forming mechanism.New structural analysis and geochronological data are both inconsistent with the current models of backarc extension and extension by strike-slip fault.New data of structural styles and geochronometry in the Dulong-Song Chay metamorphic dome indicate at least two epoches of major extensional tectonics: the D₂ deformation of the rising and exhumation of the dome occurred at 237-228 Ma; and the D₂ deformation overprinted and re-deformed on the dome at 86-78 Ma.Of them,the D₂ deformation shows a consistent forming time,extensional direction and tectonic regime amongst the Dulong-Song Chay dome,South China block and the north margin of the South China Sea basin.Regional geology shows that the north margin of the South China Sea basin belongs to the South China block.Therefore,we interpret that the Late Mesozoic to Early Cenozoic extensional tectonics occurred in the north margin of the South China Sea basin as a result of the interplate deformation of the South China block The Ailaoshan-Red River sinistral slip strengthened the Cenozoic extension in the South China Sea.
- South China Sea basin,
- Dulong-Song Chay metamorphic dome,
- South China block,
- extensional tectonic,
- geochronological determination

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Structural Styles and Chronological Evidences from Dulong-Song ChayTectonic Dome: Earlier Spreading of South China Sea Basin due toLate Mesozoic to Early Cenozoic Extension of South China Block

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