Okhotsk belt, Tuva-Mongolia metallogenic province, Central Asian Orogenic Belt, Eurasian Platei
| Regional Level Types | |
|---|---|
| Okhotsk belt | Mineral Belt |
| Tuva-Mongolia metallogenic province | Mineral Province |
| Central Asian Orogenic Belt | Orogenic Belt |
| Eurasian Plate | Tectonic Plate |
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Type:
This belt is in the central CAOB, along the southern Mongol-Okhotsk Suture Zone across the China-Russia-Mongolia border. Tectonically, it evolved under the southeastward subduction of the Mongol-Okhotsk oceanic plate and subsequent syn-collision after ocean closure, which drove regional faulting and magmatism. Magmatism is characterized by the Late Triassic–Early Cretaceous calc-alkaline I-type granites/porphyries, derived from mantle-mafic magma mixing with juvenile crust remelts. It comprises two sub-belts: The Okhotsk − Selenge Sub-belt lies in northern Mongolia, formed in a Late Permian-Early Triassic active continental margin related to Mongol-Okhotsk oceanic plate subduction. It has calc-alkaline magmatism with adakitic traits. The Okhotsk − Derbugan Sub-belt is in NE Inner Mongolia, controlled by Mongol-Okhotsk oceanic plate subduction and Derbugan Fault activity. It is featured by the Indosinian-Yanshanian I-type granitoids and fault-fold ore controls.
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