Study on molybdenite Re-Os and zircon U-Pb ages of the Dongping tellurium-gold deposit in Hebei Province

doi:10.13745/j.esf.sf.2020.3.29

Abstract

Abstract:

The Dongping tellurium-gold (Te-Au) deposit is the largest alkaline pluton-related Te-Au deposit in China. Although many studies have been conducted on the deposit, its geochronology and genesis remain controversial. In this paper, we report on molybdenite Re-Os and zircon U-Pb ages to determine the timing and genesis of the Dongping Te-Au deposit. Two types of molybdenite have been identified. The disseminated molybdenite often co-exists with sulfides in syenite. Two disseminated molybdenite samples yield model ages of 401.1±2.1 and 402.8±2.1 Ma. The vein-type molybdenite contains native gold grains and occurs as aggregations or veinlets in quartz-sulfide veins. Two aggregated samples show model ages of 380.3±2.0 and 376.9±2.9 Ma. Magmatic zircons collected from quartz veins yield a crystallization age of 394±1.7 Ma, while the hydrothermal zircons are dated as 382±4.7 Ma. We argue that a Devonian mineralization stage existed in the Dongping Te-Au deposit, which was related to the magmatic-hydrothermal activity of the Shuiquangou alkaline complex. The deposit underwent metasomatism, activation, and enrichment processes driven by late Jurassic to early Cretaceous hydrothermal events, which eventually produced this large Te-Au deposit. Tellurium in Dongping deposit was mainly derived from partial melting of upper mantle and oceanic materials. Fluid exsolution and degasification of the Shuiquangou alkaline magma generated high oxygen fugacity medium- to meta-alkalic hydrothermal fluids and vapors, which are helpful for tellurium migration and enrichment.

Key words: Dongping tellurium-gold deposit, molybdenite Re-Os age, zircon U-Pb age, tellurium super-enrichment, Zhangjiakou district

CLC Number:

WANG Dazhao, LIU Jiajun, ZHAI Degao, ZHEN Shimin, WANG Jiang. Study on molybdenite Re-Os and zircon U-Pb ages of the Dongping tellurium-gold deposit in Hebei Province[J]. Earth Science Frontiers, 2020, 27(2): 405-419.

Figures/Tables 11

Fig.1 Regional geology of the Zhangjiakou district. Adapted from [7].

Fig.2 Simplified geological map of the Dongping tellurium-gold deposit. Adapted from [27].

Fig.3 Midpiece map of No.70 vein plane (A) and profile map of exploratory line (B) in the Dongping tellurium-gold deposit. Fig.B is adapted from [27].

Fig.4 CL images of zircons from auriferous quartz vein in the Dongping tellurium-gold deposit

Fig.5 U-Pb ages of magmatic and hydrothermal zircon of quartz vein in the Dongping tellurium-gold deposit

Table 1 LA-ICP-MS zircon U-Pb dating results of the Dongping tellurium gold deposit

Table 2 Results of zircon trace element compositions of the Dongping tellurium-gold deposit

Fig.6 Chondrite normalized distribution curve of rare earth element of magmatic and hydrothermal zircons from quartz vein of the Dongping tellurium-gold deposit

Fig.7 Discriminant diagrams of zircon types of quartz vein in the Dongping tellurium-gold deposit. Modified from [31].

Fig.8 Field and microscope photographs of the Dongping molybdenites

Table 3 Re-Os isotope results of molybdenite samples from the Dongping tellurium-gold deposit

样品编号	产状	w(Re)及误差/10^-6		w(¹⁸⁷Re)及误差/10^-6		w(¹⁸⁷Os)及误差/10^-9		模式年龄及误差/Ma		来源
样品编号	产状	测值	±2σ	测值	±2σ	测值	±2σ	测值	±2σ	来源
17DP-5502	细脉状	72.85	0.49	45.79	0.31	291.02	1.88	380.28	2.00	文献[17]
17DP-5816	细脉状	2.27	0.01	1.43	0.01	9.00	0.04	376.89	2.88
17DP-5504	浸染状	61.81	0.23	38.85	0.14	260.51	0.80	401.14	2.05
17DP-7403	浸染状	38.32	0.14	24.09	0.09	162.18	0.51	402.8	2.10	本文

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