Zhaoqing, China
Zhaoqing, China

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Zhong L.,CAS South China Sea Institute of Oceanology | Li J.,CAS Guangzhou Institute of Geochemistry | Peng T.,CAS Guangzhou Institute of Geochemistry | Xia B.,Sun Yat Sen University | Liu L.,No. 719 Geological Team
Lithos | Year: 2013

The Shi-Hang Zone is an important NE-SW-trending Mesozoic magmatic belt in South China, which is dominated by granites with relatively high εNd(t) values and young TDM model ages. Here, we present laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb ages, major and trace element compositions, and Sr-Nd-Hf isotope data for the Yuanzhuding porphyritic granitoids within the southwestern Shi-Hang Zone, and use these data to determine the origin of this granitoid and its relationship with Cu-Mo mineralization. Zircon U-Pb dating indicates that these granitoids were emplaced at 157.8±1.1Ma. They have initial 87Sr/86Sr ratios of 0.70941-0.71398, εNd(t) values of -3.15 to -2.02, and in situ zircon εHf(t) values of +1.71 to +6.17. Geochemically, most of them are high-K calc-alkaline and show an adakitic affinity. They are more likely emplaced in a continental arc setting related to westward subduction of the paleo-Pacific plate. Their parental magma originated chiefly from the overlying sediments of the downgoing slab, and subsequently interacted with the lithospheric mantle wedge at the temperatures of ~790°C. High oxygen fugacity during magmatic evolution played a crucial role in the development of Cu-Mo mineralization within the Yuanzhuding. The discovery of the Yuanzhuding deposit implies that the Chenzhou-Huaiji fault belt is most likely prospective for mineral exploration for porphyry Cu-Mo deposits. © 2013 Elsevier B.V.

Chu K.,Chinese Academy of Geological Sciences | Mao J.,Chinese Academy of Geological Sciences | Chen M.,Chinese Academy of Geological Sciences | Zhao J.,Chang'an University | And 3 more authors.
Earth Science Frontiers | Year: 2013

The Yuanzhuding Cu-Mo porphyry deposit, located at the southwest of the Qin-Hang Neoproterozoic suture, is a newly discovered large-scale Cu-Mo deposit in the metallogenic belt. Based on a detailed analysis of geological characteristics and a study of H, O, S, and Pb isotopic geochemistry, the features of fluid evolution and the origin of the ore-forming fluid of the deposit has been discussed preliminarily in this paper. The results show that the sulfur came mainly from the ore-forming magma and the δ34S values of sulfide in the ore distributed in a range between -4.3‰-3.9‰. The ore has a stable isotopic composition composed of common lead. Considering the Metallogenic geodynamics background, the Yuanzhuding deposit mineralization was closely related to a magmatic activity, and was originated from the mixing of the crust and mantle material triggered by the subduction. According to the alteration of H and O isotope composition in different ore-forming stage and the existing fluid inclusion studies, it is suggested that the mixing between meteoric water and the hydrothermal fluid of ore-bearing magma is the key factor that caused the Yuanzhuding metallic minerals precipitated out of the ore-forming fluids.

Zhong L.,CAS South China Sea Institute of Oceanology | Zhong L.,CAS Guangzhou Institute of Geochemistry | Liu L.,CAS Guangzhou Institute of Geochemistry | Xia B.,CAS Guangzhou Institute of Geochemistry | And 4 more authors.
Resource Geology | Year: 2010

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 ± 4.3-Ma (2σ), and analyses of 11 samples from boreholes ZK12-112 and ZK16-104 yield a Re-Os isochron age of 155.6 ± 3.4-Ma (2σ). 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. © 2010 The Authors. Resource Geology © 2010 The Society of Resource Geology.

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