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蛇纹石化橄榄岩是温都尔庙蛇绿岩套中最为重要的岩石类型,主要矿物组合为蛇纹石+碳酸盐矿物+磁铁矿+滑石。富SiO_2流体的加入,促使岩石进一步发生蛇纹石化作用而缺失水镁石。穆斯堡尔谱测量揭示了铁元素化学种的分布特征,蛇纹石化程度与氧化-还原特征的相关性。蛇纹石化橄榄岩含铁总量和Fe~(3+)的分布与磁铁矿和蛇纹石密切相关,Fe~(3+)以分布于蛇纹石中占优势。这对正确估算蛇纹石化过程中H_2的生成量有十分重要的意义,对估算俯冲带Fe~(3+)输入和评估原生地幔岩的蛇纹石化作用有重要参考价值。
Serpentinized peridotites are the most important types of rocks in the Ondolmia ophiolite suite. The main mineral assemblages are serpentine + carbonate minerals + magnetite + talc. The enrichment of SiO_2 fluid can promote the further serpentinization of rocks and the absence of brucite. Mossbauer spectroscopy reveals the distribution of iron chemical species, the correlation between serpentinization and oxidation-reduction characteristics. The total amount of iron and the distribution of Fe ~ (3+) in the serpentinized peridotite are closely related to the magnetite and serpentine, and Fe ~ (3+) is dominant in the serpentine. This is very important for correctly estimating the formation of H_2 in the serpentinization process. It is of great value to estimate the Fe 3+ input in the subduction zone and evaluate the serpentinization of primary mantle rocks.