『Abstract
Large areas of central Asia and mainland China have been affected
by intraplate anorogenic magmatism, linked to mantle activity
from the Palaeoproterozoic to present day. This magmatism is manifested
by layered mafic-ultramafic intrusions, flood basalts, bimodal
volcanic rocks, dyke swarms, I- and A-type granitoids, alkaline
complexes, carbonatites and kimberlites. In this paper we discuss
a selection of these thermal events, namely East Asia Mesozoic-Cenozoic,
Siberian Traps, Emeishan, Tarim (Bachu), Yakutsk and South China.
Mineral systems that are associated with the Asian intraplate
magmatic events include Ni-Cu-PGE in mafic-ultramafic intrisions,
porphyry Cu-Mo and skarn deposits, polymetallic veins and auriferous
lode deposits generally hosted in granitoids, rare earths and
rare metals in alkaline complexes and diamondiferous kimberlites.
The anorogenic intraplate igneous rocks originate from mantle
sources or mixed mantle and crustal sources and are related, directly
or indirectly, to deep mantle plumes or to asthenospheric upwellings
that occur in response to lower crust and subcontinental lithosphere
delamination linked to collision and subduction processes.
Keywords: Intraplate magmatism; Mantle plume; Mineral systems;
Mafic-ultramafic intrusions; Alkaline complexes』
1. Introduction
2. Large igneous provinces of Central Asia and China
3. East Asia Mesozoic-Cenozoic intraplate events
3.1. Metallogeny
4. Permo-Triassic (285-250 Ma) intraplate magmatism
4.1. Greater Siberian Traps
Eastern Kazakhstan
Southeastern Altay and northwestern Mongolia
Okhon-Selenga basin
4.1.1. Metallogeny
Kuznetsk Basin and Kolyvan-Tomsk fold zone (KTFZ)
4.2. Emeishan event (260 Ma)
4.2.1. Metallogeny
4.3. Tarim (Bachu) event (〜280-275 Ma)
4.3.1. Metallogeny
4.4. Yakutsk event (380-360 Ma) Siberian Craton
4.4.1. Metallogeny
4.5. The 〜825-750 Ma event, South China and Alashan block
4.5.1. Metallogeny
5. Intraplate magmatism metallogeny: discussion and conclusions
Acknowledgments
References