检索结果-南通市图书馆

Intracontinental lithospheric delamination:Constraints from imaging the mantle transition zone beneath the Southwestern part of the Sichuan Basin

引用

中国科学:地球科学英文版 2023年第10期66卷 2340-2352页

作者： Fan YANG Juan LI Sidan CHEN Yun CHEN Long LI Yinshuang AI Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China Heilongjiang Mohe Observatory of Geophysics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China CAS Center for Excellence in Deep Earth Science Guangzhou510640China

The Southwestern part of the Sichuan Basin(SW-SCB)is adjacent to the eastern Himalayan syntaxis.Affected by the Indo-Eurasian collision and subsequent intrusion of the Indian plate into the Eurasian plate during the Cenozoic,this region is ideal for the study of the tectonic evolution of the intracontinental lithosphere and the dynamic processes of deep and shallow structures.In this study,we applied the receiver function technique to the data obtained from a recently deployed high-density broadband seismic array across the sichuan basin and sichuan-Yunnan block(SCB-SYB).We conducted a multi-frequency and multi-model correction analysis to image the structure of the mantle transition zone beneath this region.The results showed the660-km discontinuity gradually increasing in depth by 10-30 km beneath the western side of the Anninghe-Xiaojiang Fault,suggesting the presence of thermal anomalies caused by the subducted Indian plate from west to east.At the junction of the SCBSYB,the 410-km discontinuity exhibited a slight uplift of 5-10 km,while the 660-km discontinuity showed a significant depression of~30 km over a lateral range of~150 km.Based on previous surface GPS observation and dynamic numerical simulation studies,we suggest that the sharp lateral small-scale topography of this 660-km discontinuity beneath the SW-SCB may have resulted from dripping delamination of the lithosphere within the strain localization area.Furthermore,the aggregation of delaminated lithospheric material at the base of the 660-km discontinuity determines the regional topography of mantle transition zone discontinuities.In this study,we provided seismological evidence for the challenging detection of small-scale intracontinental lithosphere dripping delamination.Moreover,it provides a new view for studying deep and shallow dynamic processes in intracontinental regions with stress concentration resulting from plate/continental subduction and collision.

关键词： Mantle transition zone Receiver function Southwestern part of the Sichuan Basin Dripping lithospheric delamination sichuan-Yunnan block

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：