Origins of cratonic mantle discontinuities: A view from petrology, geochemistry and thermodynamic models

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• 作者：Sonja Aulbach^a ; ^{s.aulbach@em.uni-frankfurt.de} ; Malcolm Massuyeau^b ; Fabrice Gaillard^b
• 关键词：Mid-lithospheric discontinuities ; Lithosphere-asthenosphere boundary ; Seismic velocity ; Electrical conductivity ; Metasomatism ; Melt migration
• 刊名：Lithos
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：268-271
• 期：Complete
• 页码：364-382
• 全文大小：2742 K
• 卷排序：268

文摘

Review of petrologically plausible explanations for cratonic mantle discontinuities Melt at cratonic LAB depth (≥ 200 km) due to anomalous sublithospheric X-T, retarded drainage and/or resupply Conflicting seismic-petrologic LAB signatures due to thermochemical-mechanical erosion MLDs result mostly from past deposition of metasomes at mechanical boundary layers. Omnipresent metasomes documented by alkaline melts, underestimated due to non-representative sampling