Metallogenesis in Tibetan collisional orogenic belt. II : mineralisation in late-collisional transformation setting.

The tectonic evolution of the Tibetan orogen is divided into syn- collisional, late-collisional and post-collisional periods. The orogeny during the late-collisional period was characterised by intra-continental subduction, crustal shortening, large-scale thrusting and strike-slip faulting systems which developed in the margins of the Tibetan plateau, and resulted in the development of potassic porphyry stocks and carbonatite-alkalic complexes in eastern Tibet and potassic-ultrapotassic volcanic rocks in northern Tibet. Four significant metallogenic events occurred in the eastern margin of the Tibetan plateau, porphyry Cu-Mo(- Au) mineralisation related to a large-scale strike-slip faults system, REE mineralisation associated with carbonatite-alkalic complexes which formed the Mianning-Dechang REE belt in western Sichuan, Pb-Zn-Ag mineralisation controlled by thrust faulting systems, forming at least two large Pb-Zn-Ag deposits in the Lanping strike-slip pull-apart basin, western Yunnan, and Au mineralisation related to large-scale shearing, which produced shear- or orogenic-type Au deposits in western Sichuan and Yunnan.
The tectonic evolution of the Tibetan orogen is divided into syn- collisional, late-collisional and post-collisional periods. The orogeny during the late-collisional period was characterised by intra-continental subduction, crustal shortening, large-scale thrusting and strike-slip faulting systems which developed in the margins of the Tibetan plateau, and resulted in the development of potassic porphyry stocks and carbonatite-alkalic complexes in eastern Tibet and potassic-ultrapotassic volcanic rocks in northern Tibet. Four significant metallogenic events occurred in the eastern margin of the Tibetan plateau, porphyry Cu-Mo(- Au) mineralisation related to a large-scale strike-slip faults system, REE mineralisation associated with carbonatite-alkalic complexes which formed the Mianning-Dechang REE belt in western Sichuan, Pb-Zn-Ag mineralisation controlled by thrust faulting systems, forming at least two large Pb-Zn-Ag deposits in the Lanping strike-slip pull-apart basin, western Yunnan, and Au mineralisation related to large-scale shearing, which produced shear- or orogenic-type Au deposits in western Sichuan and Yunnan.