南沙海域晚中新世火山侵入伸展幕

doi:10.7623/syxb2013S2015

石油学报 ›› 2013, Vol. 34 ›› Issue (增刊二): 129-136.DOI: 10.7623/syxb2013S2015

• 地质勘探 • 上一篇

南沙海域晚中新世火山侵入伸展幕

关成尧^1,2, 张厚和³, 漆家福², 邱楠生², 吴景富³, 杨桥², 高剑波³

1. 防灾科技学院地震科学系河北三河 065201;
2. 中国石油大学油气资源与探测国家重点实验室北京 102249;
3. 中海油研究总院北京 100027

收稿日期:2013-08-20 修回日期:2013-11-25 出版日期:2013-12-25 发布日期:2014-01-15
通讯作者: 关成尧，男，1976年4月生，1999年毕业于石油大学（华东）石油工程专业，2013年获中国石油大学（北京）地质学专业博士学位，现为防灾科技学院讲师，主要从事构造地质和油气盆地研究工作。Email：gcywww@126.com
作者简介:关成尧，男，1976年4月生，1999年毕业于石油大学（华东）石油工程专业，2013年获中国石油大学（北京）地质学专业博士学位，现为防灾科技学院讲师，主要从事构造地质和油气盆地研究工作。Email：gcywww@126.com
基金资助:
国家重大科技专项（2011ZX05025-005）资助。

Volcano intrusive stretching episode in Late Miocene Nansha basins of South China Sea

GUAN Chengyao^1,2, ZHANG Houhe³, QI Jiafu², QIU Nansheng², WU Jingfu³, YANG Qiao², GAO Jianbo³

1. Department of Earthquake Science, Institute of Disaster Prevention Science and Technology, Sanhe 065201, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
3. CNOOC Research Institute, Beijing 100027, China

Received:2013-08-20 Revised:2013-11-25 Online:2013-12-25 Published:2014-01-15

摘要/Abstract

摘要：

南海在17 Ma已经停止扩张，其中南沙海域在晚中新世进入盆岭构造期，在10.4 Ma和5.5 Ma发生两期次火山喷发，形成南沙盆岭构造带，火山切割原有盆地结构，并导致盆地内复杂变形。10.4 Ma后南沙海域基底沉降是西沙海域基底沉降的4倍，为了分析西沙和南沙之间巨大沉降差异的原因，建立了火山的二维和三维平衡地质剖面模型，经计算发现南沙海域的火山侵入体积远大于地层变形体积，火山侵入约占地壳体积的1/4。火山侵入早期在深部形成的局部挤压伸展形成盆地浅部的拉张伸展环境，形成南沙海域晚中新世火山侵入伸展幕。

关键词: 南沙盆地区, 盆岭构造, 火山侵入, 伸展幕, 晚中新世, 火山平衡地质剖面

Abstract:

The spreading of the South China Sea had stopped and fault activity weakened, but it started nurturing volcanic intrusion in 17 Ma. In the Late Miocene "basin-range" period, there occurred two volcanic eruptions at 10.4 Ma and 5.5 Ma. The volcano cutting the original volcanic basin structure and lead to and complexed the deformation of those basins. The basement subsidence in Nansha is four times the Xisha after 10.4 Ma. To anysis the huge difference of the post-rift subsidence between Nansha and Xisha,the 2D and 3D volcano balanced geological section model were established, and the paper calculated that the volcanic intrusion volume in Nansha basins was much larger than the volume of stratum deformation. The volcanic intrusion had made those basins extending and fast stretching, volcanic intrusive crustal volume was accounted for about 1/4 of the crust. Volcanic intrusion in "volcano intrusive stretching episode" bring an extensional environment in the shallow formation of the basin and again bring a new fast stretching in late Miocene.

Key words: Nansha basins, basin-range, volcano intrusive, stretching episode, late Miocene, volcano balanced geological section

中图分类号:

TE121.2

关成尧, 张厚和, 漆家福, 邱楠生, 吴景富, 杨桥, 高剑波. 南沙海域晚中新世火山侵入伸展幕[J]. 石油学报, 2013, 34(增刊二): 129-136.

GUAN Chengyao, ZHANG Houhe, QI Jiafu, QIU Nansheng, WU Jingfu, YANG Qiao, GAO Jianbo. Volcano intrusive stretching episode in Late Miocene Nansha basins of South China Sea[J]. ACTA PETROLEI SINICA, 2013, 34(增刊二): 129-136.

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南沙海域晚中新世火山侵入伸展幕

Volcano intrusive stretching episode in Late Miocene Nansha basins of South China Sea

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