Foundering Lithosphere Imaged Beneath the Southern Sierra Nevada, California, USA
Foundering Lithosphere Imaged Beneath the Southern Sierra Nevada, California, USA
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DOI：
10.1126/science.1099181
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发表时间：
2004-07
期刊：
影响因子：
56.9
通讯作者：
O. Boyd;Craig H. Jones;A. Sheehan
中科院分区：
文献类型：
--
作者：
O. Boyd;Craig H. Jones;A. Sheehan
地震层析成像显示，富含石榴石的地壳和地幔岩石圈下降到内华达山脉东南部下方的上地幔。下降的岩石圈由两层组成：富铁榴辉岩位于富镁石榴石橄榄岩之上。这些结果将下降的榴辉岩放置在之前在大峡谷南部下方拍摄的高P波速物质的上方和东部，这表明岩石圈去除过程中存在先前意想不到的一致性。
Seismic tomography reveals garnet-rich crust and mantle lithosphere descending into the upper mantle beneath the southeastern Sierra Nevada. The descending lithosphere consists of two layers: an iron-rich eclogite above a magnesium-rich garnet peridotite. These results place descending eclogite above and east of high P wave speed material previously imaged beneath the southern Great Valley, suggesting a previously unsuspected coherence in the lithospheric removal process.