期刊
INTERNATIONAL JOURNAL OF EARTH SCIENCES
卷 98, 期 6, 页码 1381-1393出版社
SPRINGER
DOI: 10.1007/s00531-008-0412-2
关键词
North-eastern Mongolia; Normal shear zone; High-grade metamorphism; U-Pb geochronology; Mesozoic extension
资金
- AREVA
- French Bureau de Recherche Geologique et Miniere (BRGM)
- Mongolian Academy of Sciences in Ulaanbaatar
Mesozoic rift basins locally bounding metamorphic core complexes have been recognized in Transbaikalia and northern China. Numerous basement outcrops located between these two regions, in eastern Mongolia, are considered as pre-Palaeozoic in age. One of these, the Ereendavaa Range, appears as a gneissic core marked by amphibolite-facies metamorphic conditions. The range is overlain to the NW by the unmetamorphosed Mesozoic Onon Basin. Below the basin, the upper part of the range consists of a gently NW-dipping shear zone associated with top-to-the-NW motion. The structural pattern is consistent with syn-extensional exhumation of the range. Preliminary geochronological data indicate that the shear zone is late Jurassic to early Cretaceous in age, coeval with the Onon Basin. These new data from eastern Mongolia constitute a link between Transbaikalia and northern China, indicating that NW-SE extensional Mesozoic tectonics occurred throughout the entire region.
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