Using Whole Rock and Zircon Geochemistry to Assess Porphyry Copper Potential of the Tonggou Copper Deposit, Eastern Tianshan

Autor:	Shun-Da Li, Xuebing Zhang, Hong-yan Quan, Shi-Shan Wu, Chuan Chen, Feng-Mei Chai, Keyong Wang
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	Mineralization (geology) Tonggou deposit lcsh:Mineralogy lcsh:QE351-399.2 Fractional crystallization (geology) 010504 meteorology & atmospheric sciences Geochemistry Trace element chemistry.chemical_element Geology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Copper Ce4+/Ce3+ ratio in zircon Mantle (geology) Porphyry copper deposit chemistry Carboniferous Eastern Tianshan porphyry Cu mineralization 0105 earth and related environmental sciences Zircon fractional crystallization
Zdroj:	Minerals Volume 10 Issue 7 Minerals, Vol 10, Iss 584, p 584 (2020)
ISSN:	2075-163X
DOI:	10.3390/min10070584
Popis:	Eastern Tianshan hosts a number of porphyry Cu deposits. However, these mainly formed in the Jueluotage Belt, in the middle part of Eastern Tianshan. The Tonggou porphyry Cu mineralization is an exception to this, since it is located in the Bogda Orogenic Belt, north of Eastern Tianshan. We obtained new zircon U&ndash Pb ages, whole-rock geochemical data, zircon Hf isotope data, and zircon trace element compositions. LA-ICP-MS zircon U&ndash Pb dating indicates a crystallization age of 302.2&ndash 303.0 Ma for the Tonggou mineralized granodiorite (TMG), which suggests that the Tonggou porphyry Cu mineralization formed in the Late Carboniferous period. &epsilon Hf (t) data (1.8&ndash 14.1) for TMG suggests it was sourced from juvenile crustal melts, mixed with some mantle materials. TMG displays low &Sigma REE, compatible elements (Ba, Sr, Zr, and Hf), Zr/Hf and Nb/Ta ratios, as well as clearly negative Eu anomalies in whole rocks analyses. In addition, TMG is enriched in P, Hf and Th/U ratios in zircon, and has lower crystallization temperatures (734 to 735 ° C) than the Daheyan barren granodiorite (DBG) (753 to 802 ° C). Whole rock and zircon geochemical analyses show that the TMG was formed by fractional crystallization to a greater extent than the DBG in the Bogda Orogenic Belt. Moreover, zircon grains of the TMG show high Ce4+/Ce3+ ratios (159&ndash 286), which are consistent with related values from large porphyry deposits of the Central Asian Orogenic Belt (CAOB). High Ce4+/Ce3+ ratios reflect oxidizing magmas as a result of fractional crystallization, which indicates that the Tonggou deposit has potential to host a large porphyry Cu deposit.
Databáze:	OpenAIRE
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