Geochemistry and Their Implications for Mineralization of Disuga Indosinian Porphyry in Zhongdian, Yunnan, China

doi:10.19657/j.geoscience.1000-8527.2019.06.13

Abstract

Abstract:

Disuga Indosinian porphyry, proved as quartz diorite porphyry, is located at the north of the eastern-porphyry belt in Zhongdian island arc. Influenced by subduction of the Ganzi-Litang Ocean, both porphyries from Disuga and Pulang super-large porphyry copper deposit, are products of the same magmatic activity in the late subduction. Studies on major element compositions show that Disuga quartz diorite porphyries contain normal SiO₂ but high Al₂O₃ and alkali (K₂O +Na₂O) contents. The porphyries are also enriched in large ion lithophile elements (LILEs) and depleted in high field strength elements (HFSEs).Light and heavy rare earth elements are highly fractionated in these porphyries,and they are enriched in LREEs but depleted in HREEs.Compared with 38 chemical data of Pulang ore-bearing quartz diorite porphyries, Disuga quartz diorite porphyries have lower SiO₂ and Y, higher ∑REE and (La/Yb)_N ratio, but similar MnO and Al₂O₃/(CaO+Na₂O+K₂O) ratio. In diagrams of SiO₂-Al₂O₃/(CaO+Na₂O+K₂O) and Y-MnO for ore-bearing and baron porphyries, Disuga porphyries data were ploted in the same area as Pulang. In addition, Disuga porphyries have obvious anomalies of geophysical survey, geochemical prospecting and remote sensing images, which can serve as mineralized indicators. The local denudation predicted was less than the porphyry emplacement in depth, which was more favorable to the ore preservation. The above results indicate that Disuga porphyry intrusion has the potential to hold a certain large scale porphyry copper deposit.

Key words: Disuga, Zhongdian, porphyry copper deposit, Pulang, geochemistry, ore-bearing and baron porphyries

CLC Number:

PAN Yanning, DONG Guochen, LI Xuefeng, WANG Peng, SUN Zhuanrong, DONG Pengsheng, LI Huawei. Geochemistry and Their Implications for Mineralization of Disuga Indosinian Porphyry in Zhongdian, Yunnan, China[J]. Geoscience, 2019, 33(06): 1275-1285.

Figures/Tables 8

Fig.1 Setting of Zhongdian island arc zone and regional geologic map

Fig.2 Simplified geologic map of Disuga and the sample position

Fig.3 Hand specimen photographs and microphotographs of the Disuga quartz diorite porphyry

Fig.4 SiO2-(Na2O+K2O) diagram(a), SiO2-K2O diagram (b) and A /CNK-A /NK diagram (c) for the Disuga quartz diorite porphyry

Fig.5 Primitive-mantle normalized incompatible element spidergram (a) and chondrite-normalized REE pattern (b) for the Disuga quartz diorite porphyry

Fig.6 SiO2-Al2O3/(CaO+Na2O+K2O)diagram (a) and Y-MnO diagram (b) for the Pulang quartz diorite porphyry and the Disuga quartz diorite porphyry

Fig.7 SiO2-∑REE diagram (a) and SiO2-(La/Yb)N diagram (b) for the Pulang quartz diorite porphyry and the Disuga quartz diorite porphyry (symbols as Fig.6)

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