Key parameters of the structure and evolution of the Okinawa Trough: Modelling results constrained by heat flow observations

doi:10.1002/gj.3356

IOCAS-IR > 海洋地质与环境重点实验室

	Key parameters of the structure and evolution of the Okinawa Trough: Modelling results constrained by heat flow observations
	Zhang, Liang1,2 ; Luan, Xiwu 2,3; Zeng, Zhigang 1,2; Li, Hong2,3
	2019-11-01
发表期刊	GEOLOGICAL JOURNAL
ISSN	0072-1050
卷号	54 期号:6 页码:3542-3555
通讯作者	Luan, Xiwu([email protected])
摘要	Heat flow data (664 measurements) in the Okinawa Trough and adjacent areas are edited and analysed in this study. The distribution of heat flow in the study area is obviously correlated with tectonic zones. The heat flow is extremely high and variable in the back-arc basin and extremely low in the trench. A 2D transient heat conduction-advection model is used to test and determine the thermal structure and evolution of the Okinawa Trough under the heat flow distribution constraint. The results show that (a) high sedimentation rates can reduce heat flow by 30-35%; lower heat flow in the southern than in the central-northern Okinawa Trough might be caused by the thick sediment covering due to the Taiwan orogenic uplift. (b) Heat flow can be enhanced dramatically by mantle upwelling, but magma intrusion accompanied by ascending fluid is necessary for the extremely high heat flow along the central Okinawa Trough axis. A magma intrusion age of 0.5 Ma, an intrusion depth of 1 km, and a fluid flow speed in the magma of 9 cm/year are the best fit parameters for the central Okinawa Trough. (c) Given the distribution of heat flow, we suggest that the evolutionary model differs between the central-northern and the southern Okinawa Trough. The rifting in the central-northern Okinawa Trough began at 10 Ma with a mean rate of 0.4 cm/a, while the rifting in the south Okinawa Trough started at 6 Ma with a higher rate of 0.6 cm/a. (d) A double magma chamber may exist underneath the axis of the Okinawa Trough at depths of 10 and 24-30 km beneath the seafloor. The temperatures and pressures at these depths support the existence of partial melting, which became the primary basis for maintaining the extremely high heat flow currently observed in the Okinawa Trough.
关键词	heat flow distribution modelling Okinawa Trough tectonic evolution
DOI	10.1002/gj.3356
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41406065]; National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02]; Special Fund for Land & Resources Scientific Research in the Public Interest[201511037]; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061]; Aoshan Talents Program[2015ASTP-0S17]; Aoshan Scientific and Technological Innovation Project of QNLM[QNLM201708]; Aoshan Scientific and Technological Innovation Project of QNLM[2016ASKJ13]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000496020400023
出版者	WILEY
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/165071
专题	海洋地质与环境重点实验室
通讯作者	Luan, Xiwu
作者单位	1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China 3.China Geol Survey, Qingdao Inst Marine Geol, Qingdao 266071, Shandong, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Zhang, Liang,Luan, Xiwu,Zeng, Zhigang,et al. Key parameters of the structure and evolution of the Okinawa Trough: Modelling results constrained by heat flow observations[J]. GEOLOGICAL JOURNAL,2019,54(6):3542-3555.
APA	Zhang, Liang,Luan, Xiwu,Zeng, Zhigang,&Li, Hong.(2019).Key parameters of the structure and evolution of the Okinawa Trough: Modelling results constrained by heat flow observations.GEOLOGICAL JOURNAL,54(6),3542-3555.
MLA	Zhang, Liang,et al."Key parameters of the structure and evolution of the Okinawa Trough: Modelling results constrained by heat flow observations".GEOLOGICAL JOURNAL 54.6(2019):3542-3555.

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