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中源地震的成因机制问题一直是固体地球科学研究的热点问题,其中被广泛接受的是脱水脆变机制。中源地震带在俯冲板块中多呈双层带状分布,分别对应着含水变玄武岩层与岩石圈地幔蛇纹岩层的脱水过程。在过去的研究中,对中源地震脱水脆变机制的主要验证研究方法包括:①理论研究与活动俯冲带地震数据解释;②高温高压实验室模拟研究。而最近10年,陆续在阿尔卑斯等古俯冲带中发现了出露于地表的榴辉岩相假玄武玻璃或脆性破裂岩,被认为是古中源地震的直接野外岩石学证据,从而成为研究中源地震的一种新的途径。重点介绍了中源地震脱水脆变机制的岩石学研究进展。
The origin mechanism of Zhongyuan earthquake has always been a hot issue in solid earth science research. Among them, the mechanism of dehydration and embrittlement is widely accepted. The Zhongyuan seismic belt is mostly double-banded in the subducting slab, corresponding to the dehydration process of water-bearing basalts and lithospheric mantle serpentinite, respectively. In the past studies, the main validation methods for the mechanism of dehumidification and degeneracy of the Zhongyuan earthquake include: (1) theoretical study and interpretation of active subduction zone seismic data; (2) high-temperature and high-pressure laboratory simulation studies. In the recent 10 years, some eclogite glass or brittle fracture rocks exposed in the ancient subduction zone such as the Alps have been found to be the direct field petrographic evidence of the Paleozoic source earthquake, A new way of source earthquake. The progress of petrology research on the mechanism of mid-source seismic dewatering is highlighted.