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Mesozoic sub-continental lithospheric mantle extension and related porphyry copper mineralization in South China
Li XiaoFeng1,2,3; Hua RenMin4; Ma DongSheng4; Xu Jing1,2; Zhang Long1,2,3; Qi YouQiang5; Wu LiYan5; Zhu YiTing1,2,3
AbstractMost of the large porphyry copper deposits occurred in arc setting, which are closely related to oceanic crust subduction, especially to partial melting of mantle materials caused by dehydration of subducted plates. Recent studies have shown that porphyry copper deposits can occur in non-subduction setting, such as intra-continental and continental collision setting. The formation of porphyry copper deposits in continental collision setting is related to the partial melting of lithosphere modified by subduction. The fertilized magma emplaced in the shallow part of the crust through the crystallization differentiation and crustal contamination. However, the spatial and temporal distribution of porphyry copper deposits in the intra-continents setting are incompatible with the structures of the contemporary subduction zones, its genesis mechanism and dynamic process are not very clear. It has been a long intra-continental tectonic setting since the Paleozoic in South China. Three episodes porphyry copper systems (Early Jurassic, Late Jurassic and Early Cretaceous) occurred in Mesozoic, which related to the intra-continental tectonic setting. The Late Jurassic porphyry copper system was concurrent with the large-scale W-Sn mineralization in South China. The spatial and temporal distributions of these porphyry deposits are obviously inconsistent with those of the subduction-related porphyry copper system in southwestern USA and Cordilleran orogenic belt. The characteristics of sub-continental lithospheric mantle extension-related porphyry copper deposits is quite different from those occurred as linear formed in subduction, post-subduction extension, and continental collision setting. Especially, the porphyry copper deposits in the Early Cretaceous porphyry copper deposits which distributed as planar, which basically consistent with Mesozoic crustal thinning area in South China. Although the porphyry copper deposits of these three periods show arc magma affinity in geochemistry, the Nd-Sr isotope of the porphyries indicate the contribution of mantle to mineralization vary from the regions and the metallogenic types. The geological facts prove that the lithosphere of South China has undergone obvious extension during these three periods. The extent of lithospheric extension may vary in different regions of South China in each period. Therefore, we called the porphyry copper deposit from these three episodes as " intra-continental extensional porphyry copper deposit". The metallogenic mechanism of the Mesozoic intra-continental extensional porphyry copper deposits may be related to the upwelling of asthenosphere under the lithospheric extension background, which resulting in the transformation of the subcontinental lithospheric mantle or lower crust.
KeywordSub-continental lithosphere extension Asthenosphere upwelling Lithosphere mantle Porphyry copper South China
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000456937400005
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Document Type期刊论文
Corresponding AuthorLi XiaoFeng
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Jiangsu, Peoples R China
5.Chinese Acad Sci, Inst Geochem, Guiyang 550081, Guizhou, Peoples R China
Recommended Citation
GB/T 7714
Li XiaoFeng,Hua RenMin,Ma DongSheng,et al. Mesozoic sub-continental lithospheric mantle extension and related porphyry copper mineralization in South China[J]. ACTA PETROLOGICA SINICA,2019,35(1):76-88.
APA Li XiaoFeng.,Hua RenMin.,Ma DongSheng.,Xu Jing.,Zhang Long.,...&Zhu YiTing.(2019).Mesozoic sub-continental lithospheric mantle extension and related porphyry copper mineralization in South China.ACTA PETROLOGICA SINICA,35(1),76-88.
MLA Li XiaoFeng,et al."Mesozoic sub-continental lithospheric mantle extension and related porphyry copper mineralization in South China".ACTA PETROLOGICA SINICA 35.1(2019):76-88.
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