Syn-rift magmatic characteristics and evolution at a sediment-rich margin: Insights from high-resolution seismic data from the South China Sea
Syn-rift magmatic characteristics and evolution at a sediment-rich margin: Insights from high-resolution seismic data from the South China Sea
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富含沉积物边缘的同裂谷岩浆特征和演化：来自南海高分辨率地震数据的见解
DOI：
10.1016/j.gr.2020.11.012
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发表时间：
2020-12
影响因子：
6.1
通讯作者：
Zhao Yanghui
中科院分区：
文献类型：
--
作者：
Zhang Cuimei;Sun Zhen;Manatschal Gianreto;Pang Xiong;Qiu Ning;Su Ming;Zheng Jinyun;Li Hongbo;Gu Yale;Zhang Jiangyang;Zhao Yanghui
与裂陷边缘形成有关的岩浆作用和伸展作用之间的相互作用一直是并且仍然是高度有争议的。对裂谷作用期间岩浆的增加、开始时间和岩浆收支的解释仍然存在争议，而且缺乏约束。在这项研究中，我们探讨了在裂谷系统的高沉积速率和一个良好的地层格架的岩浆附加物的侵位，并讨论了解决这些问题的前景，在本文中，我们提出了新的高分辨率地震剖面成像的远缘和过渡到大洋地壳在北方南海（SCS）。根据对岩浆相关构造的观察及其与沉积序列的相互关系，以及IODP Expeditions 367和368的钻探结果，我们确定了岩浆增加的特征和时间。结果表明，在富沉积物的远缘，岩浆活动主要以岩盖和岩床为标志。它们的侵位开始于裂谷阶段，向海扩展并持续到裂谷后早期。破裂是由ENE走向的锥形火山的形成触发的。在这项研究中，我们表明，在裂谷过程中，岩浆的增加量逐渐增加，并持续到23.8 Ma，即裂谷停止后。一阶估计的岩浆增加量提供了第一步了解的岩浆预算的北方南海裂谷，尽管它的重要性，仍然缺乏从大多数现今裂谷边缘。
The interaction between magmatic and extensional processes related to the formation of rifted margins has been and still is highly debated. The interpretation of magmatic additions, timing of onset and budget of magma during rifting remains controversial and poorly constrained. In this study we explore the emplacement of magmatic additions in a rift system with high sedimentation rates and a well-established stratigraphic framework and discuss the perspectives toward resolving some of these problems.In this paper, we present new high-resolution seismic profiles imaging the distal margin and transition to oceanic crust in the northern South China Sea (SCS). Based on the observation of magma-related structures and the interrelationship with the sedimentary sequence, as well as the drilling results of IODP Expeditions 367&368, we define characteristics and timing of magmatic additions. The result shows that magmatic activity is expressed mainly by laccoliths and sills in the sediment-rich distal margin. Their emplacement initiated during the rifting stage, propagated seaward and continued until the early post-rift. Breakup was triggered by the formation of ENE striking cone-shaped volcanoes.In this study we show that the amount of magmatic additions progressively increases during rifting and lasted until 23.8 Ma, i.e. after the cessation of rifting. First order estimates of the amount of magmatic additions provide a first step toward understanding the magmatic budget of the northern SCS during rifting, which, despite its importance, is still lacking from most present-day rifted margins.
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影响因子：
2.9
作者：
Zhichao Zhou;L. Mei;Jun Liu;Jinyun Zheng;Liang Chen;Shihao Hao
通讯作者：
Zhichao Zhou;L. Mei;Jun Liu;Jinyun Zheng;Liang Chen;Shihao Hao
影响因子：
2.9
作者：
Y. Pin;Z. Di;Zhao-shu Liu
通讯作者：
Y. Pin;Z. Di;Zhao-shu Liu
DOI：
10.1144/gsl.sp.2003.218.01.05
发表时间：
2003
期刊：
Geological Society, London, Special Publications
影响因子：
--
作者：
O. Müntener;G. B. Piccardo
通讯作者：
O. Müntener;G. B. Piccardo
影响因子：
2.9
作者：
T. Reston
通讯作者：
T. Reston
影响因子：
2.9
作者：
H. Avendonk;L. Lavier;D. Shillington;G. Manatschal
通讯作者：
H. Avendonk;L. Lavier;D. Shillington;G. Manatschal