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Petrogenesis and tectonics of the Naruo Porphyry Cu(Au) deposit related intrusion in the Duolong Area, Central Tibet

Citation

Ding, S and Chen, Y and Tang, J and Zheng, W and Lin, B and Yang, C, Petrogenesis and tectonics of the Naruo Porphyry Cu(Au) deposit related intrusion in the Duolong Area, Central Tibet, Acta Geologica Sinica, 91, (2) pp. 581-601. ISSN 1000-9515 (2017) [Refereed Article]


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ę 2017 Geological Society of China

DOI: doi:10.1111/1755-6724.13119

Abstract

The Duolong area is the most important part of the Western Bangong-Nujiang Suture Zone porphyry Cu(Au) metallogenic belt, in Tibet, China. Here new detailed data are presented from LA-ICP-MS zircon U-Pb, whole-rock geochemical, and in-situ zircon Hf isotope analyses for igneous rocks in the large Naruo deposit (2.51áMt of Cu and 82át of Au) which is located ∼2ákm NE of the Duolong (Duobuza and Bolong) super-large gold-rich porphyry copper deposit. We integrated our results with previous research of other porphyry deposits in the Duolong area and have identified the timing, geodynamic setting, and petrogenesis of the mineralization-associated magmatic events. Based on the measurements, the Duolong area porphyry Cu(Au) deposit formations are associated with Early Cretaceous intermediate-felsic magmatism, which is consistent with U-Pb zircon ages of 120áMa. All the main intrusive rocks in the ore-concentrated area have similar lithogeochemical characteristics; they show a relative enrichment in both light rare earth elements (LREEs) and large-ion lithophile elements (LILEs: Rb, Ba, K, etc.) and relative depletion in both heavy rare earth elements (HREEs) and high field strength elements (HFSEs: Nb, Ta, Zr, Hf, etc.). Moreover, the granite porphyry shows positive εHf(t) values between 1.38ľ7.37 suggesting that magmas were potentially derived from the partial melting of a depleted mantle wedge that had been metasomatized by subducted slab-derived fluids or melts. This paper points out that the formation of the porphyry-epithermal Cu(Au) deposit in the Duolong area was dominated by northward subduction of the Bangongco Tethys Plate beneath the Qiangtang block in the Early Cretaceous (124ľ114áMa), when the subducted oceanic crust reached 50ľ70 km underground and generated different degrees of phase transformation, which lead to a melt produced by dehydration of amphibole minerals, a metasomatized mantle wedge, and induced mantle partial melting that produced the magma. Those deposits occurred in a continental arc tectonic setting, which is similar to the continental margin arc environment of the ocean-continent subduction setting of the Andes metallogenic belt in South America.

Item Details

Item Type:Refereed Article
Keywords:geochemical signatures, zircon U-Pb, Hf isotope, Duolong area, continental arc, depleted mantle, Central Tibet, Proto-Tethys
Research Division:Earth Sciences
Research Group:Geology
Research Field:Tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Lin, B (Mr Bin Lin)
ID Code:125392
Year Published:2017
Web of Science® Times Cited:1
Deposited By:CODES ARC
Deposited On:2018-04-16
Last Modified:2018-05-04
Downloads:0

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