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JUVENILE MAGMATISM AND CRUSTAL RECYCLING AT THE END OF THE NEOARCHEAN IN WESTERN SHANDONG PROVINCE, NORTH CHINA CRATON: EVIDENCE FROM SHRIMP ZIRCON DATING.
- Source :
-
American Journal of Science . Dec2010, Vol. 310 Issue 10, p1503-1552. 50p. 3 Color Photographs, 5 Black and White Photographs, 2 Charts, 3 Graphs, 4 Maps. - Publication Year :
- 2010
-
Abstract
- Western Shangdong Province experienced major crustal growth as a result of 2.75 to 2.50 Ga tectonothermal events, different from other Archean areas in the North China Craton. Besides early Neoarchean tonalite-trondhjemite-granodiorite (TTG) and supracrustal assemblages, there are large volumes of late Neoarchean gabbroic, dioritic and granitic rocks in western Shandong. SHRIMP zircon dating of thirty-one samples of different rock types from late Neoarchean rocks yielded a narrow age range from 2560 to 2490 Ma. Based on these data and previously published results, the following conclusions can be drawn: 1) the Archean basement can be divided into three belts: a Late Neoarchean (2525-2490 Ma) crustally-derived granite belt in the northeast, an Early Neoarchean (2.75-2.60 Ga) rock belt in the center, and a Late Neoarchean (2550-2500 Ma) belt of juvenile rocks in the southwest; 2) the tectonic regime in western Shandong Province probably changed from compressional to extensional at around 2525 Ma (between 2530 and 2520 Ma); 3) crustal recycling with addition from the mantle occurred at the end of the Neoarchean; 4) the late Archean magmatic rocks were probably formed in an arc environment. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MAGMATISM
*CRUST of the earth
*VOLCANISM
*CRATONS
*GRANITE
*IGNEOUS rocks
Subjects
Details
- Language :
- English
- ISSN :
- 00029599
- Volume :
- 310
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- American Journal of Science
- Publication Type :
- Academic Journal
- Accession number :
- 61844422
- Full Text :
- https://doi.org/10.2475/10.2010.11