Onset of slab mantle melting in Earth’s lower mantle: Evidence from ferropericlase in superdeep diamonds

IF 12.5 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-10-15 DOI:10.1126/sciadv.adt9106

Peng Ni, Steven B. Shirey, Michael J. Walter, Janina Czas, Davide Novella, Fabrizio Nestola, Nico Kueter, Evan M. Smith, Thomas Stachel, D. Graham Pearson, Andrew Steele, Laura L. Gardner, Steven D. Jacobsen, Ben Harte, Jeffrey W. Harris, Anat Shahar

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Abstract

Ferropericlase ([Mg_x,Fe_1-x]O), the most common inclusion in sublithospheric diamonds, has a poorly understood crystallization history and depth of origin. Nineteen microscopic ferropericlase grains with different Mg#s were released from Juína and Kankan diamonds with mantle-like carbon, for Mg and Fe isotopic analysis. Two groups of ferropericlase inclusions can be distinguished with respect to diamond growth: high-Mg# inclusions with mantle-like Mg and Fe (δ²⁶Mg = −0.23 ± 0.22‰; δ⁵⁶Fe = 0.00 ± 0.14‰) inferred to be preexisting and lower Mg# inclusions with non–mantle-like heavy Fe (δ⁵⁶Fe up to +0.3‰) and light Mg (δ²⁶Mg down to −1.4‰) inferred to be coeval. We propose that coeval ferropericlase inclusions formed by melting of hydrated and carbonated peridotitic slab components subducted to lower mantle depths. Continuous reaction of these melts with surrounding reduced, dry slab harzburgite can produce the large range in Mg# and Ni contents of our ferropericlase suite—a heretofore unexplained feature of global ferropericlase data.

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地球下地幔板块地幔融化的开始：来自超深钻石中铁长石的证据

铁方长石（[Mg x,Fe 1-x]O）是岩石圈下钻石中最常见的包裹体，其结晶历史和起源深度尚不清楚。从Juína和Kankan两种具有地幔样碳的钻石中释放出19个不同Mg#s的显微铁方长石颗粒，进行了Mg和Fe同位素分析。在金刚石生长方面，可以区分出两组铁镁长石包裹体：具有地幔样Mg和Fe的高Mg#包裹体（δ 26 Mg = - 0.23±0.22‰；δ 56 Fe = 0.00±0.14‰）推断为已存在，而具有非地幔样重铁（δ 56 Fe高达+0.3‰）和轻Mg （δ 26 Mg低至- 1.4‰）的低Mg#包裹体推断为同期存在。我们认为同时期的铁方长石包裹体是由俯冲到下地幔深处的水合和碳酸化橄榄岩板块组分熔融形成的。这些熔体与周围还原的干板状硬锰矿的连续反应可以产生我们的镁长石组中Mg#和Ni含量的大范围变化，这是迄今为止全球镁长石数据无法解释的特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.