| 北大别木子店石榴辉石岩的麻粒岩相退变质作用 |
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| 引用本文： | 张泽明,钟增球.北大别木子店石榴辉石岩的麻粒岩相退变质作用[J].地球科学,2000,25(3):295-301. |
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| 作者姓名： | 张泽明 钟增球 |
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| 作者单位： | 1.中国地质科学院地质研究所, 北京 100037 |
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| 基金项目： | 国家自然科学基金!重大项目 (No .497940 4)，国家自然科学基金面上项目 (No .49772 14 2和No .49772 14 6)，国土资源部大陆动力学 |
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| 摘 要： | 详细的岩相学、矿物化学、岩石化学和变质作用温压条件计算表明, 大别变质地体北部角闪二辉麻粒岩是石榴辉石岩在其抬升过程中经历麻粒岩相退变质作用的产物, 峰期变质作用至少是发生在高压榴辉岩相条件下, 而且地温梯度较低.石榴辉石岩的退变质作用p-t轨迹以早期的近等温降压、中期的近等压升温和晚期的降温降压为特征.这一结果表明北大别变质地体的峰期变质作用并非仅达麻粒岩相.
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| 关 键 词： | 麻粒岩 石榴辉石岩 榴辉岩相 P-T轨迹 北大别地体 |
| 收稿时间： | 1999-09-30 |
GRANULITE-FACIES RETROGRADE METAMORPHISM OF GARNET PYROXENITE IN MUZIDIAN, NORTHERN DABIE MOUNTAINS |
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| Zhang Zeming,Zhong Zengqiu,You Zhendong,Hu Kaiming.GRANULITE-FACIES RETROGRADE METAMORPHISM OF GARNET PYROXENITE IN MUZIDIAN, NORTHERN DABIE MOUNTAINS[J].Earth Science-Journal of China University of Geosciences,2000,25(3):295-301. |
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| Authors: | Zhang Zeming Zhong Zengqiu You Zhendong Hu Kaiming |
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| Institution: | Zhang Zeming 1 Zhong Zengqiu 2 You Zhendong 2 Hu Kaiming 3 |
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| Abstract: | The detailed investigation into the amphibole two_pyroxene granulite in the north of Dabie metamorphic terrain in terms of petrography, mineral chemistry, petrochemistry, and estimated p_t conditions for metamorphism indicates that this rock is a product of the garnet pyroxenite that experienced the granulite_facies retrograde metamorphism during its uplift. The peak metamorphism occurred at least in the high_pressure eclogite facies at a lower temperature gradient. The retrograde metamorphism p_t path of the garnet pyroxenite was characterized by the near isothermal decompression in the early stage, the near isobaric temperature rise in the middle stage and the temperature fall and decompression in the late stage. These features suggest that the p_t conditions of peak metamorphism in the northern Dabie terrain are higher than that of granulite facies. |
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| Keywords: | granulite garnet pyroxenite eclogite facies p_t path northern Dabie terrain |
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