| 大别山超高压变质带中牛凸岭地区低温-高压榴辉岩的发现及其意义 |
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| 引用本文： | 石永红,林伟,王清晨.大别山超高压变质带中牛凸岭地区低温-高压榴辉岩的发现及其意义[J].岩石学报,2008,24(6):1288-1296. |
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| 作者姓名： | 石永红 林伟 王清晨 |
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| 作者单位： | 1. 合肥工业大学资源和环境工程学院,合肥,230009
2. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京,100029 |
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| 摘 要： | 依据时南大别超高压带腹地的榴辉岩野外地质调查、岩相学和热力学的研究表明,南大别腹地--牛凸岭地区榴辉岩属于低温高压榴辉岩,并未经历超高压变质作用.该地区榴辉岩的共生围岩主要为片岩、片麻岩和斜长角闪岩,石榴石多为自形-半自形,内含大量的早期矿物包体,峰期变质温压条件分别为:T=360～520℃;P=1.3～2.4GPa.对比南大别超高压榴辉岩形成的变质条件,两者压力差可达0.7GPa,约20km厚的地壳深度缺失.结合构造分析牛凸岭单元更类似于桐城-源潭铺高压块体,推测其属于构造上层部位岩片.
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| 关 键 词： | 榴辉岩 峰期变质P-T条件 牛凸岭单元 压力差 |
The discovery of low-temperature and high-pressure eclogites across Niutuling area in the ultrahigh pressure eclogite Unit and its significance |
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| SHI YongHong,LIN Wei,WANG QingChen.The discovery of low-temperature and high-pressure eclogites across Niutuling area in the ultrahigh pressure eclogite Unit and its significance[J].Acta Petrologica Sinica,2008,24(6):1288-1296. |
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| Authors: | SHI YongHong LIN Wei WANG QingChen |
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| Abstract: | On the basis of the field investigation,petrology and thermodynamic estimates for eclogites in the middle of the South Dabie Terrane (SDT),the eclogites across Niutuling area in the the middle of SDT belong to low-temperature and high-pressure eclogites,and no underwent ultrahigh pressure metamorphism.The country rocks for the ecolgites are schists,gueisses and plagioclase amphibolite.Garnet display enhedral or subhedral crystal with inclusions in earlier stage,the peak metamorphic temperature and pressure ... |
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| Keywords: | Eclogites Peak P-T condition Niutuling unit Pressure gap |
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