共轭裂谷边缘的构造-地层-岩浆演化——来自南海西北部的观察

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Peng Chao , Gianreto Manatschal , Pauline Chenin , Jianye Ren , Cuimei Zhang , Xiong Pang , Jinyun Zheng , Linlong Yang , Nick Kusznir
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引用次数: 6

摘要

本文对南海西北v型裂谷盆地尖端的高质量反射地震剖面进行了详细分析。利用对共轭裂陷边缘完整的沉积和岩浆构造进行成像的地震线CGN-1剖面,我们:(1)提供了地壳构造的详细描述;(2)定义伸展域,将其与特定的变形相联系起来;(3)确定与裂陷有关的构造地层演化。在此基础上,我们提出了一种运动学修复方法,并量化了拉伸量和相关的应变率。我们讨论了运动演化与沉积和岩浆记录之间的联系,并用惠勒图加以说明。基于对不同地层模式和地壳结构的识别和表征,我们提出了定性和定量的标准来解释颈缩和超伸展两个关键裂谷事件。这两件事都与个体化和随后对所谓基石的肢解有关,这里称之为h块。这是首次使用这种方法来破译现今共轭裂陷边缘完整的同裂谷巨型层序的构造-地层演化。本研究与以往对相关表面的解释不同之处在于:(1)不同类型的顶基底;(2)同裂谷记录内的同构造和后构造包裹体。它为南海西北部构造地层演化提供了新的解释,并有可能被用作分析、量化和关联裂谷边缘地震剖面记录的事件的新方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The tectono-stratigraphic and magmatic evolution of conjugate rifted margins: Insights from the NW South China Sea

This study is based on a careful analysis of high-quality reflection seismic sections located at the tip of the NW South China Sea V-shaped rift basin. Using the CGN-1 section, a seismic line imaging the complete sedimentary and magmatic architecture of conjugate rifted margins, we: (1) provide a detailed description of the crustal architecture; (2) define extensional domains, which we relate to specific deformation phases; and (3) determine the tectono-stratigraphic evolution linked to rifting. Based on these, we propose a kinematic restoration and quantify the amounts of extension and associated strain rates. We discuss the link between the kinematic evolution and the sedimentary and magmatic record and illustrate it in a Wheeler Diagram. Relying on the identification and characterization of distinct stratal patterns and crustal architectures, we propose qualitative and quantitative criteria to interpret two critical rift events that are necking and hyperextension. These two events are linked to the individualization and subsequent dismembering of a so-called keystone, here referred to as H-block. It is the first time such an approach is used to decipher the tectono-stratigraphic evolution of a complete syn-rift mega-sequence across present-day conjugate rifted margins. This study differs from previous interpretations of correlative surfaces in the distinction between: (1) different types of top basement; and (2) syn- and post-tectonic packages within the syn-rift record. It leads to new interpretations of the tectono-stratigraphic evolution of the NW South China Sea and has the potential to be used as a new approach to analyze, quantify and correlate events recorded in seismic sections across rifted margins.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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