利用SS前驱波研究纳斯卡‒南美俯冲带周边上地幔间断面起伏及其动力学意义

doi:10.13209/j.0479-8023.2017.179

北京大学学报自然科学版 ›› 2018, Vol. 54 ›› Issue (6): 1186-1194.DOI: 10.13209/j.0479-8023.2017.179

利用SS前驱波研究纳斯卡‒南美俯冲带周边上地幔间断面起伏及其动力学意义

马宇岩, 盖增喜^†

北京大学地球与空间科学学院, 北京 100871

收稿日期:2017-11-27 修回日期:2017-12-14 出版日期:2018-11-20 发布日期:2018-11-20
通讯作者: 盖增喜, E-mail: zge(at)pku.edu.cn
基金资助:
国家自然科学基金(41374045, 41074029)资助

Topography of Upper Mantle Discontinuities Beneath Nazca Plate and Its Surrounding Area Reveals from SS Precursor and Its Tectonic Significance

MA Yuyan, GE Zengxi^†

School of Earth and Space Sciences, Peking University, Beijing 100871

Received:2017-11-27 Revised:2017-12-14 Online:2018-11-20 Published:2018-11-20
Contact: GE Zengxi, E-mail: zge(at)pku.edu.cn

摘要/Abstract

摘要：

利用USArray的远震记录资料, 对1万多条地震记录的SS前驱波进行共反射点叠加分析(叠加范围是半径为5°的球冠), 得到纳斯卡板块南部及南美板块西部(120°W—60°W, 30°S—5°N)上地幔间断面的起伏形态。由于数据很好地覆盖了研究区域, 叠加范围更小, 因此比以往的结果具有更高的空间分辨率。在Galapagos, Easter和 San Felix这3个热点下方观测到的间断面起伏形态符合地幔深部存在高温异常的假设。还观测到: 在东太平洋洋隆南段下方, 410 km间断面深度增加; 在俯冲带下方, 410 km和 660 km间断面深度增加。

关键词: 上地幔间断面, 地幔过渡带, 热点, 俯冲板块, 东太平洋洋隆南段

Abstract:

An upper mantle discontinuity topography map of southern Nazca Plate and western South America Plate (120°W?60°W, 30°S?5°N) was obtained by using common mid-point stacking in bins of 5 degree radius over ten thousand USArray teleseismic records. The resolution was higher than that of previous studies because the records more densely sampled the region so that stacking bins were smaller. Discontinuity topography corresponding to high temperature anomalies in deep mantle was observed beneath Galapagos, Easter and San Felix hotspots. Other findings include a depression of 410 km discontinuity beneath Southern East Pacific Rise and depressions of both 410 km and 660 km discontinuities beneath the subduction zone.

Key words: upper mantle discontinuity, mantle transition zone, hotspot, slab, Southern East Pacific Rise

中图分类号:

P315

马宇岩, 盖增喜. 利用SS前驱波研究纳斯卡‒南美俯冲带周边上地幔间断面起伏及其动力学意义[J]. 北京大学学报自然科学版, 2018, 54(6): 1186-1194.

MA Yuyan, GE Zengxi. Topography of Upper Mantle Discontinuities Beneath Nazca Plate and Its Surrounding Area Reveals from SS Precursor and Its Tectonic Significance[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2018, 54(6): 1186-1194.

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链接本文: https://xbna.pku.edu.cn/CN/10.13209/j.0479-8023.2017.179

https://xbna.pku.edu.cn/CN/Y2018/V54/I6/1186

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[2]	牟南,吴朝东. 上扬子地区震旦—寒武纪磷块岩岩石学特征及成因分析[J]. 北京大学学报（自然科学版）, 2005, 41(4): 551-562.

利用SS前驱波研究纳斯卡‒南美俯冲带周边上地幔间断面起伏及其动力学意义

Topography of Upper Mantle Discontinuities Beneath Nazca Plate and Its Surrounding Area Reveals from SS Precursor and Its Tectonic Significance

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