U-Pb and Lu-Hf systematics of zircons from Sargur metasediments, Dharwar Craton, Southern India: new insights on the provenance and crustal evolution

被引：10
|
作者：
Maibam, Bidyananda [1 ]
Gerdes, Axel [2 ]
Srinivasan, R. [3 ]
Goswami, J. N. [4 ]
机构：
[1] Manipur Univ, Dept Earth Sci, Imphal 795003, Manipur, India
[2] Goethe Univ Frankfurt, Inst Geosci, Mineral, D-60438 Frankfurt, Germany
[3] Indian Inst Sci, Ctr Atmospher & Ocean Sci, Bengaluru 560012, India
[4] Phys Res Lab, Ahmadabad 380009, Gujarat, India
来源：
CURRENT SCIENCE | 2017年 / 113卷 / 07期
关键词：
Detrital zircon; high-and low-grade metamorphism; isotope analysis; supracrustal rocks; WHOLE-ROCK GEOCHEMISTRY; SUPRACRUSTAL ROCKS; DETRITAL ZIRCONS; TRANSITION ZONE; GREENSTONE-BELT; ISOTOPE RECORD; ND ISOTOPES; CONSTRAINTS; KARNATAKA; AGE;
D O I：
10.18520/cs/v113/i07/1394-1402
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 study of U-Pb and Lu-Hf-Yb isotope data in zircons from metamorphosed psammopelite and quartzite from the type area of Archaean Sargur Group, Dharwar Craton, India is carried out. Two age populations are observed: an older population with concordant U-Pb ages between 2.7 and 2.8 Ga, and a younger population with ages in the 2.4-2.6 Ga age range. The. Hf values of 0 to +2.0 for the older zircon population suggest that they were derived from juvenile crust formed at 2.7-2.8 Ga. Sub-chondritic. Hf values for the younger population indicate metamorphism and/or crustal reworking at similar to 2.5 Ga. Meta-sedimentary enclaves in the Sargur type area are therefore part of the gneiss-supracrustal complex of different antiquities and may not have an independent stratigraphic status.
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页码：1394 / 1402
页数：9
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