Ultrahigh temperature metamorphism in khondalites and charnockites of Anakapalle, Eastern Ghats Granulite Belt, India

被引：0
|
作者：
Lal, S. N. [2 ]
Prakash, D. [1 ]
机构：
[1] Banaras Hindu Univ, Dept Geol, Varanasi 221005, Uttar Pradesh, India
[2] Kumaun Univ, Dept Geol, Naini Tal 263002, India
来源：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES | 2007年 / 77A卷
关键词：
reaction textures; khondalites; charnockites; geothermobarometry; petrogenetic grid;
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：
A suite of khondalite and charnokite at Anakapallae, Eastern Ghats Granulite Belt preserves a variety of reaction textures that attests several prograde and retrograde reactions. Mineral paragenesis and metamorphic reactions have been deduced through textural and phase compatibility relationships. A schematic petrogenetic grid for the pertinent system suggests the spinel, biotite, K-feldspar invariant points to be stable. Pressure - temperature estimation for core compositions using convergence techniques in the present study reveals P-T estimates of ca. 920 +/- 10 degrees C/ 8.8 +/- 0.20 kbar for peak metamorphism followed by cooling and decompression ca. 650 +/- 50 degrees C/6.8 +/- 0.20 kbar
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页码：229 / 240
页数：12
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