Geochronology and Geochemistry of the Mamupu Cu-Au Polymetallic Deposit, Eastern Tibet: Implications for Eocene Cu Metallogenesis in the Yulong Porphyry Copper Belt,Acta Geologica Sinica-English Edition

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Geochronology and Geochemistry of the Mamupu Cu-Au Polymetallic Deposit, Eastern Tibet: Implications for Eocene Cu Metallogenesis in the Yulong Porphyry Copper Belt
Acta Geologica Sinica-English Edition ( IF 3.3 ) Pub Date : 2021-09-20 , DOI: 10.1111/1755-6724.14807
Xiaoxu ZHANG _{1,

2} , Bin LIN ₂ , Juxing TANG ₂ , Liang HE ₃ , Rui SHAO ₃ , Qiu DU ₃ , Wangdui SILANG ₄ , Ouzhu CIREN ₄ , Quzhen GUSANG ₄ , Zhongga CIDAN ₄

Affiliation

The Mamupu skarn-type Cu-Au polymetallic deposit is a first-discovered medium deposit in the southern Yulong porphyry copper belt (YPCB), eastern Tibet. The Cu-Au mineralization mainly occurs as chalcopyrite in breccia within the plate-like carbonate interlayer, and is closely related to chloritization (e.g., chlorite, magnetite and epidote) and skarnization (e.g., diopside, tremolite and garnet). The ore-related quartz syenite porphyry (QSP) and granodiorite porphyry (GP) were emplaced at 40.1 ± 0.2 Ma and 39.9 ± 0.3 Ma, respectively. The QSP of Mamupu is an alkaline-rich intrusion, relatively enriched in LREE, LILE, depleted in HFSE, with no significant negative Eu and Ce anomalies, slightly high (⁸⁷Sr/⁸⁶Sr)_i, low ε_Nd(t), uniform (²⁰⁶Pb/²⁰⁴Pb)_i, and ε_Hf(t) values, which indicates that the porphyry magma may be caused by the mixing of metasomatized EM II enriched mantle and thickened juvenile lower crust. The QSP in the Mamupu deposit share a similar genesis of petrology to other ore-related porphyries within the YPCB. High oxygen fugacity and water content of magmas are essential for the formation of porphyry and skarn Cu deposits. The QSP has the similar high magmatic oxidation states and water contents as the Yulong deposit, which indicate that the Mamupu has high prospecting potential. Difference in geological characteristics and mineralization scale between the Mamupu and other YPCB deposits may be due to the different emplacement depth of ore-related intrusions and the difference in surrounding rocks.

更新日期：2021-09-20

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