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The discovery of low-temperature and high-pressure eclogites across Niutuling area in the ultrahigh pressure eclogite Unit and its significance
Author(s): 
Pages: 1288-1296
Year: Issue:  6
Journal: ACTA PETROLOGICA SINICA

Keyword:  榴辉岩峰期变质P-T条件牛凸岭单元压力差;
Abstract: 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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