近日，英国剑桥大学Claudine Israel团队报道了现今洋岛源区中的冥古宙布里奇曼石。该研究于2026年7月1日发表在《自然》杂志上。

约束地球内部的复杂动力学，需要融合地球化学、地球物理学和地球动力学等多个学科的研究成果。地震学和地球动力学研究为地幔结构的现状提供了认识，而地球化学方法则描述了地幔的化学和同位素异质性，揭示了其演化的复杂性。其中一个关键挑战是确定这些化学异质性的持续时间和起源。

研究组展示了现今火山活动中新型高精度Nd同位素测量结果，识别出可追溯至地球最早历史时期的异质特征。在科摩罗群岛Fani Maoré海底火山的熔岩中报告了142Nd的显著正异常。要解释这些异常，就意味着地幔中必须长期保留一类轻稀土元素（REE）亏损的物质，且该物质形成于地球诞生后的最初1亿年之内。

研究组认为，这种物质主要由早期地球岩浆海洋结晶形成的布里奇曼石组成。这一冥古宙布里奇曼石在现代地幔中的分布可能比先前预期的更为广泛，这引发人们产生了一个新的疑问，其在数十亿年板块构造和强烈地幔对流中是如何保存下来的？

附：英文原文

Title: Hadean bridgmanite in the source of a present-day ocean island

Author: Israel, Claudine, Chauvel, Catherine, Inglis, Edward, Chen, Hui, Hbert, Ccile, Badro, James

Issue&Volume: 2026-07-01

Abstract: Constraining the complex dynamics of the inner Earth unites research efforts across several scientific disciplines, including geochemistry, geophysics and geodynamics. Seismological and geodynamic studies offer insights into the present state of the mantle structure, whereas geochemical approaches characterize its chemical and isotopic heterogeneities1, shedding light on the complexity of its evolution. One key challenge is determining the age and origin of its chemical heterogeneities. Here we present new high-precision Nd isotopic measurements in present-day volcanism that identify heterogeneities dating back to the Earth’s earliest history. We report significantly positive 142Nd anomalies in lavas from the submarine Fani Maoré volcano in the Comoros archipelago. These anomalies require the preservation, in the mantle, of material depleted in light rare-earth elements (REE) and formed within the first 100million years (Myr) of Earth’s history. We suggest that this material is mainly composed of bridgmanite that crystallized from an early Earth magma ocean. This Hadean bridgmanite may be more widespread in the present-day mantle than previously expected, raising new questions about its survival over billions of years of plate tectonics and vigorous mantle convection.

DOI: 10.1038/s41586-026-10719-w

Source: https://www.nature.com/articles/s41586-026-10719-w