Serpentinization of the fore-arc mantle along the Taiwan arc-continent collision of the northern Manila subduction zone inferred from gravity modeling

NCU Institutional Repository > 研究中心 > 環境研究中心 > 期刊論文 > Item 987654321/108711

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://ir.lib.ncu.edu.tw/handle/987654321/108711

题名:	Serpentinization of the fore-arc mantle along the Taiwan arc-continent collision of the northern Manila subduction zone inferred from gravity modeling
作者:	杜文斌;Doo, Wen-Bin;Kuo-Chen, Hao;Brown, Dennis;Lo, Chung-Liang;Hsu, Shu-Kun;Huang, Yin-Sheng
贡献者:	環境研究中心
关键词:	Area;Constraint modelling;Continental margins;Density;Earth mantle;Exhumation;Gravitation;Gravity;Gravity anomalies;Gravity modeling;Lithosphere;Modelling;Ocean bottom;Orogeny;Peridotite;Plate tectonics;Seismographs;Seismometers;Serpentinization;Subduction;Subduction (geology);Subduction zones;Taiwan orogen;Tomography;Two dimensional models;Upper mantle;Velocity;Wavelength
日期:	2016-11-22
上传时间:	2026-04-23 15:02:50 (UTC+8)
出版者:	Elsevier;Amsterdam: Elsevier B.V
摘要:	摘要： Serpentinized peridotite in the fore-arc has been observed in a number of subduction zones, including the northern Manila subduction zone which terminates northward in the Taiwan arc-continent collision. How this zone of serpentinization changes northward from the subduction of thinned continental lithosphere to full arc-continent collision in the Taiwan orogeny is not well known. In this paper we present 2-D gravity modeling along three P-wave (Vp) transects across the Taiwan orogeny. Two of these transects were collected with ocean-bottom seismometers. These two transects provide good constraints on the velocity structure to the west of, and on land, southern Taiwan. Conversion of Vp to density in this area allows us to model the gravity anomaly with very little misfit. Along the subduction zone, however, the velocity models are poorly constrained in the upper mantle, where an anomalous density unit has to be used in order to model the short wavelength gravity anomaly in this area. A third transect across central Taiwan that is derived from the TAIGER local tomography data, provides good control on the crust and upper mantle Vp structure that we use to place provide density constraints for modeling the gravity anomaly in this part of the collision zone. In order to model the short wavelength gravity anomaly across the Longitudinal Valley and the southern Longitudinal trough, an anomalous density block is required beneath the fore-arc region. We interpret that the source of this anomalous density material could be serpentinized fore-arc mantle, similar to what is interpreted for the northern Manila subduction zone farther south. Water released from the subduction of the extended crust of the continental margin results in the serpentinization of the fore-arc area and may be driving the uplifting of the high-pressure rocks. •An anomalous density block observed in the fore-arc region.•The anomalous density block could be related serpentinization and distributes along the Longitudinal Valley, the suture zone.•The degree of serpentinization is approximately 18%. 出版者： Amsterdam: Elsevier B.V 出版日期： 2016-11-22 出處： Tectonophysics, 2016-11, Vol.691, p.282-289 資源來源： Elsevier ScienceDirect Journals 版權： 2016 Elsevier B.V. 版權： Copyright Elsevier BV Nov 22, 2016 識別號： ISSN: 0040-1951 識別號： EISSN: 1879-3266 識別號： DOI: 10.1016/j.tecto.2016.10.019
显示于类别:	[環境研究中心] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	36	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....