Re-Os Geochronology of Molybdenite from Yuanzhuding Porphyry Cu-Mo Deposit in South China

Abstract

The Yuanzhuding porphyry Cu-Mo deposit, discovered in 2008, is located within the southern segment of the Chenzhou-Huaiji fault belt, South China. The deposit is hosted within the Upper Cambrian neritic facies sandstone and shale formation that is the strata of the axis and wings of within the Yuanzhuding anticline. Both of the porphyry and exo-contact zone contain Cu-Mo mineralization. Economic orebodies occur mainly in the exo-contact zone around the porphyry. We dated 11 molybdenite samples obtained from two borehole cores of the deposit, using the Re-Os method. Analyses of eight molybdenite samples from borehole ZK12-112 yield a Re-Os isochron age of 157.3 Ϯ 4.3 Ma (2s), and analyses of 11 samples from boreholes ZK12-112 and ZK16-104 yield a Re-Os isochron age of 155.6 Ϯ 3.4 Ma (2s). These isochron ages are within the error of the Re-Os model ages, demonstrating that the age results are reliable and that the Yuanzhuding porphyry Cu-Mo deposit formed during the late Middle Jurassic. The formation age of the Yuanzhuding Cu-Mo deposit is similar to the age of intermediate-acid rocks and W-Sn polymetallic deposits along the Chenzhou-Huaiji fault belt. This concordance suggests the same geodynamic process to the igneous activity and related mineralization, raising the potentiality of the porphyry Cu-Mo mineralization in the belt.

Petrogenesis of Low Sr and High Yb A-Type Granitoids in the Xianghualing Sn Polymetallic Deposit, South China: Constrains from Geochronology and Sr–Nd–Pb–Hf Isotopes

“…The study area is located in the central part of Shi-Hang zone (Figure 1b). The NE-SW trending of the Chenzhou-Lingwu fault zone represents a regional fault in the study area (Figure 1b) [25,47]. The zone was originally formed at 970 Ma [1] and reactivated during the Triassic and the Cretaceous Eras [25].…”

“…Yuan et al [12] gave a cassiterite U-Pb weighted average age of 156 ± 4 Ma. The ore-forming age coincidesdwith the other W-Sn-Pb-Zn deposits in the Shi-Hang zone, such as the Shizhuyuan W deposit (Re-Os, 151 ± 4 Ma, [97]; Sm-Nd, 161 ± 2 Ma, [98]; Sm-Nd, 149 ± 2 Ma, [41]), the Furong tin ore field ( 40 Ar- 39 Ar, 160-150 Ma, [50]), the Yaoganxian tungsten deposit (Re-Os, 150 ± 3 Ma, [99]), the Huangshaping Pb-Zn-W-Sn-Ag deposit (Re-Os, 155 ± 2 Ma, [38]), the Yuanzhuding Cu-Mo deposit (Re-Os, 157 ± 4 Ma, [47]), and the Xitian W-Sn deposit ( 40 Ar- 39 Ar, 157-150 Ma and Cassiterite U-Pb, 154-157 Ma [100][101][102]). These ages indicate that a globally significant W-Sn polymetallic mineralization has a close relationship with the A-type granites in the Shi-Hang zone.…”

U–Pb and Re–Os Geochronology of Karamay Porphyry Mo–Cu Deposit in Western Junggar, NW China

“…The analytical results of JDC‐1 reference material (Table ) are consistent with certified values (Du et al ., ) and previous results (Stein et al ., ; Malinovsky et al ., ; Zhong et al ., ). The near‐identical nature of the model ages and isochron age suggest that the Re–Os dating data are reliable.…”

Genetic relationship between silver–lead–zinc mineralization in the Wutong deposit, Guangxi Province and Mesozoic granitic magmatism in the Nanling belt, southeast China

“…2 Regional geologic map in the vicinity of Wutong. Modified from Geng et al (2006), Zhong et al (2010), Wang et al (2011) and map provided by Prof. Chen Maohong. Ages from Geng et al (2006) (1), Wu and Zhang (1986) (2), Zhong et al (2010) (Fig.…”

“…The local geology of the Wutong area presented here is based on Misantoni (personal communication) and Lees et al (2011). The Wutong deposit is located in variably dipping Cambrian siltstones and shales likely belonging to the Shuikou Group (Zhong et al 2010). Intrusions in the region fall in two age groups, 110-90 Ma (Late Yanshanian) and 460-415 Ma (Geng et al 2006;Fig.…”