Effect of fluid exsolution from magmas on the ophiolitic chromite mineralization and serpentinization

Yu Zheng; Peng-fei ZHANG; Deping Gong; Lijie Wang; Wen-di CHAO; Yue-lu SUN; Meifu Zhou

doi:10.3724/j.issn.1007-2802.20260018

Effect of fluid exsolution from magmas on the ophiolitic chromite mineralization and serpentinization

Bulletin of Mineralogy Petrology and Geochemistry 2026

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Authors: Yu Zheng, Peng-fei ZHANG, Deping Gong, Lijie Wang, Wen-di CHAO, Yue-lu SUN, Meifu Zhou

DOI: 10.3724/j.issn.1007-2802.20260018

Cited by: 0

References: 33

Abstract

当前流行的“流体出溶携带铬铁矿富集成矿”的模型阐述了蛇绿岩型铬铁矿发生富集的过程，并解释了矿石发生显著蚀变的原因，但其可靠性有待检验。本文借助数值计算对该模型进行了评估，发现当吸附在铬铁矿颗粒上的“水膜”厚度与其半径比值达到0.28时，即可消除铬铁矿与岩浆之间的密度差值，致使铬铁矿得以单独聚集，这种情形在成矿岩浆含水量达到5~7 wt.%时有实现的可能。然而，GeoPS模拟显示橄榄石发生大规模蛇纹石化所需水含量至少为10 wt.%，远超堆晶后矿石自身的含水量，相应过程要求外来流体参与。利用已发表的Fe同位素数据可判断，橄榄石蛇纹石化有时伴随着重Fe同位素丢失的现象，也指示矿石及其临近围岩的蛇纹石化过程处于开放体系，存在流体的加入与迁出。

Fields of Study & Subjects

Geological and Geochemical Analysis Geochemistry and Elemental Analysis Geochemistry and Geochronology of Asian Mineral Deposits

Publication details

Journal / source: Bulletin of Mineralogy Petrology and Geochemistry
Volume: 45
Issue: 2
Pages: 334–344
Publication date: 1 March 2026
Language: EN

References 33