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Open AccessArticle

Zircon LA-ICP-MS U-Pb Ages and the Hf Isotopic Composition of the Ore-Bearing Porphyry from the Yanghuidongzi Copper Deposit, Heilongjiang, China, and Its Geological Significance

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Department of Geological Engineering, Qinghai University, Xining 810016, China
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Qinghai Geological Survey Institute, Xining 810012, China
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School of Economic & Managment, Shanghai Maritime University, Shanghai 201306, China
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North China University of Science and Technology, Tangshan 063210, China
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Hebei Provincial Institute of Geology and Mineral Resources Research, Langfang 065000, China
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Qinghai Fifth Geological Exploration Institute, Xining 810028, China
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Qaidam Comprehensive Geology and Mineral Exploration Institute of Qinghai Province, Golmud 816000, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(11), 676; https://doi.org/10.3390/min9110676
Received: 26 September 2019 / Revised: 24 October 2019 / Accepted: 30 October 2019 / Published: 2 November 2019
The Yanghuidongzi copper deposit is a typical porphyry copper deposit located at the eastern margin of the Xing’anling-Mongolian Orogenic Belt (XMOB). While much attention have been paid to the ore-forming age of the deposit and the magma source of the ore-bearing porphyry, this paper approaches this issue with the methods of the LA-ICP-MS zircon U-Pb dating and Lu-Hf isotopic composition of the Yanghuidongzi porphyry copper deposit. The results reveal that the Yanghuidongzi porphyry copper deposit was formed in the Early Jurassic (189.6 ± 1.0 Ma), which corresponds to the time of magmatic activity in this region. The background studies of ore-forming dynamics indicate that the formation of the Yanghuidongzi copper deposit is related to the subduction of the Paleo-Pacific plate. The Yanghuidongzi ore-bearing porphyry zircons have a positive εHf(t) value (4.4–7.0), a high 176Hf/177Hf ratio (0.282786–0.282854), and a two-stage Hf model ages (TDM2) ranging from 783 Ma to 943 Ma, all of which suggest that the Early Jurassic granodiorite porphyry of the Yanghuidongzi deposit was formed by the partial melting of newly grown crustal material from the depleted mantle in the Neoproterozoic. View Full-Text
Keywords: zircon U-Pb ages; Hf isotopic composition; porphyry copper deposit; Yanghuidongzi deposit zircon U-Pb ages; Hf isotopic composition; porphyry copper deposit; Yanghuidongzi deposit
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Cong, D.; Pang, H.; Wang, S.; Tian, Y.; Ying, H.; Huang, G. Zircon LA-ICP-MS U-Pb Ages and the Hf Isotopic Composition of the Ore-Bearing Porphyry from the Yanghuidongzi Copper Deposit, Heilongjiang, China, and Its Geological Significance. Minerals 2019, 9, 676.

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