近日，中国地质大学（武汉）Feng Yuan报道了从反岩溶到矽卡岩：石榴石对中国西北华阳川双重碳酸盐岩相关交代作用的见解。相关论文于2026年5月12日发表在《地质学》杂志上。

反矽卡岩是指由碳酸岩熔体与硅质围岩反应形成的类似矽卡岩的岩石组合，为了解碳酸岩的岩石成因及伴生矿化提供了关键信息。

研究组报道了在中国中部秦岭造山带华阳川与三叠纪（229−206 Ma）碳酸岩脉伴生的钙硅酸盐组合。研究识别出两种结构不同的富钙铁榴石石榴子石。细粒自形石榴子石的U-Pb年龄（213 ± 5 Ma）与碳酸岩就位时代一致，代表了碳酸岩熔体与硅质围岩之间的同岩浆“反矽卡岩”反应。

而与硫化物共生的自形石榴子石给出的U-Pb年龄为130.0 ± 5.2 Ma，与附近花岗岩（132 ± 1 Ma）的年龄相同，可能代表了花岗岩衍生流体与已固结碳酸岩之间发生的晚期矽卡岩反应。三叠纪组合中的矿物共生序列可分为三个连续阶段，反映了碳酸岩固结过程中熔体和流体的演化。这些结果表明，精确的年代学对于区分碳酸岩相关系统中的同岩浆反矽卡岩作用与后期热液改造至关重要。

附：英文原文

Title: Antiskarn to skarn: Garnet insights into dual carbonatite-related metasomatism at Huayangchuan, NW China

Author: Si-Qi Liu, Shao-Yong Jiang, Mostafa Fayek, Wei Chen, Qing-Qing Kang, Hao-Xiang Zhang, Feng Yuan

Issue&Volume: 2026-05-12

Abstract: Antiskarn refers to skarn-like assemblages formed by reactions between carbonatite melts and silicate wall rocks and provides critical insights into carbonatite petrogenesis and related mineralization. Here we report calc-silicate assemblages associated with Triassic (229206 Ma) carbonatite dikes at Huayangchuan, Qinling orogen, central China. Two texturally distinct andradite-rich garnets are distinguished. Fine-grained euhedral garnets yield a U-Pb age (213 ± 5 Ma) coeval with carbonatite emplacement and represent syn-magmatic “antiskarn” reactions between carbonatite melt and silicate wall rocks. Euhedral garnets intergrown with sulfides yield a U-Pb age of 130.0 ± 5.2 Ma, identical to nearby granite (132 ± 1 Ma), and possibly represent a later skarn reaction between granite-derived fluids with solidified carbonatite rocks. Mineral paragenesis in the Triassic assemblages defines three successive stages, reflecting the melt and fluid evolution during carbonatite solidification. These results demonstrate that direct geochronology is essential for distinguishing syn-magmatic antiskarnisation from later hydrothermal modification in carbonatite-related systems.

DOI: 10.1130/G54682.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G54682.1/730787/Antiskarn-to-skarn-Garnet-insights-into-dualredirectedFrom=fulltext