评“地幔下部矿物硅钙矿——钙钛矿的发现”。

Comment on "Discovery of davemaoite, CaSiO-perovskite, as a mineral from the lower mantle".

机构信息

Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.

School of Earth Sciences, University of Bristol, Bristol BS8 1TL, UK.

出版信息

Science. 2022 May 6;376(6593):eabo0882. doi: 10.1126/science.abo0882.

DOI:10.1126/science.abo0882

PMID:35536897

Abstract

Tschauner . (Reports, 11 November 2021, p. 891) present evidence that diamond GRR-1507 formed in the lower mantle. Instead, the data support a much shallower origin in cold, subcratonic lithospheric mantle. X-ray diffraction data are well matched to phases common in microinclusion-bearing lithospheric diamonds. The calculated bulk inclusion composition is too imprecise to uniquely confirm CaSiO stoichiometry and is equally consistent with inclusions observed in other lithospheric diamonds.

摘要

Tschauner 等人（报告，2021 年 11 月 11 日，第 891 页）提供的证据表明，钻石 GRR-1507 形成于下地幔。相反，这些数据支持其更浅的起源，来自寒冷的亚克拉通岩石圈地幔。X 射线衍射数据与微包裹体含岩石圈钻石中常见的相很好地匹配。计算得出的总体包裹体成分不够精确，无法唯一确定 CaSiO 化学计量，与在其他岩石圈钻石中观察到的包裹体同样一致。