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Permian Alkaline Granites in Central Inner Mongolia and Their Geodynamic Significance 1
Author(s) -
Dawei Hong,
Huaizeng Huang,
Yïjun Xiao,
Haiming Xu,
Manyuan Jin
Publication year - 1995
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.1995.mp8001003.x
Subject(s) - geology , carboniferous , permian , orogeny , devonian , magmatism , late devonian extinction , paleontology , tectonics , geochemistry , inner mongolia , margin (machine learning) , geography , structural basin , archaeology , machine learning , computer science , china
Alkaline granites (Rb‐Sr ages 276‐286 Ma) occurring in the Bayan U1‐East Ujimqin belt at the southern margin of the Siberian plate originated in a tensional tectonic environment about 60 Ma earlier than the Late Devonian to Early Carboniferous collision between the Siberian and Sino‐Korean plates. They belong to post‐orogenic A ‐ type granites and may be used as an indicator of the end of the orogeny. At the northern margin of the Sino‐Korean plate, however, only late‐orogenic calc‐alkaline granites occurred during the late Caboniferous‐Permian, and alkaline syenites did not appear until the Late Triassic. The asymmetric magmatism at the margins of the two neighbouring plates might be controlled by the differences in size and mass of the two plates.