大碰撞与地球内部神秘的团块（英文）
作者机构：Department of Earth Planetary and Space Sciences University of California
出 版 物：《Science Bulletin》 (科学通报(英文版))
年 卷 期：2024年第3期
页 面：293-294页
核心收录：
学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学]
摘 要：Deep within the Earth’s mantle,above the core-mantle boundary (CMB),lie two enigmatic structures known as Large Low-Velocity Provinces (LLVPs).Revealed from global seismic tomography,a technique akin to medical computed tomography (CT) scans but for the Earth,the LLVPs take almost antipodal regions in the lowermost mantle,one beneath the Pacific Ocean,one beneath Africa [1].Each of the two vast regions occupies roughly the size of a continent laterally and extends 500-1500 km above the CMB [2,3].They are characterized by anomalous seismic properties,i.e.,seismic waves noticeably decelerate upon encountering these regions.This has led to numerous questions about their origin,composition,and role in Earth’s geodynamic processes,and also has intrigued Earth scientists especially geophysicists for decades.
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