Phyllonites from Attur Shear Zone and its tectonic significance in Southern Granulite Terrain, South India

被引：0
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作者：
Bhadra, BK [1 ]
机构：
[1] Pondicherry Univ, Dept Earth Sci, Pondicherry 605014, India
来源：
CURRENT SCIENCE | 1999年 / 77卷 / 12期
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D O I：
暂无
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
In the eastern part of the Southern Granulite Terrain, Attur Shear Zone (ASZ) is characterized by 1 to 1.5 km wide phyllonite zone which shows the maximum intensity of shearing. The foliation planes in this zone are sub-vertical ENE-WSW striking mylonitic foliation with dominant steeply plunging (70-80 degrees) stretching lineations. The phyllonites show all gradations from protomylonite to ultramylonite and extensive biotitization of pyroxene/hornblende minerals. The microstructural studies of phyllonites indicate that ASZ has undergone extensive ductile shearing accompanied by fluid (H2O) induced retrograde metamorphism. ASZ, probably formed at deep (10-15 km) continental crust, is exhumed at the present level of erosion by relative upliftment of adjacent blocks.
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页码：1685 / 1687
页数：3
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