Citation: | ZHANG Yong, MA Zhongyuan, LI Xiaowei, KUI Mingjuan, LIU Zhigang, MO Shengjuan. 2025. Zircon U-Pb ages, geochemical characteristics and their constraints on metallogenic mechanism of ore-bearing porphyry in Qingshuihe Donggou molybdenum deposit, East Kunlun. Geological Bulletin of China, 44(4): 679-704. doi: 10.12097/gbc.2024.05.047 |
The Qingshuihe Donggou porphyry molybdenum deposit is one of the representative porphyry deposits in the East Kunlun metallogenic belt.
Therefore, a detailed study of the age, genesis and tectonic environment of the porphyry intrusions in the Qingshuihe Donggou deposit is needed to improve the understanding of the metallogenic regularity of this area. In this paper, zircon U−Pb dating, petrogeochemistry and zircon Hf isotope of the porphyries from the Qingshuihe Donggou deposit, which are closely related to the Mo mineralization, have been studied.
The zircon U−Pb age of granodiorite porphyry is 226.9 ± 1.3 Ma (MSWD = 1.03, n = 18), and the zircon U−Pb age of diorite porphyry is 224.3 ± 1.2 Ma (MSWD = 0.47, n = 15), These results indicate that this deposit formed at 226.9~224.3 Ma. Granodiorite porphyry, diorite porphyry and granite porphyry are rich in Si, Na, K and Al, poor in Ti and Mg, and show a right−leaning partition pattern characterized by the light rare earth element enrichment. The former two granites have no obvious Eu depletion (δEu: 0.79~0.98), whereas granite porphyry displays noticeable Eu depletion (δEu: 0.22~0.24). All of them are enriched in large ion lithophile elements (e.g., Rb, K, Ba), and depleted in high field strength elements (e.g., Ta, Nb, Ti, P), belonging to the metalluminous to weak peraluminous high K calc−alkaline granites. The 176Hf/177Hf ratio of zircon from these porphyry rocks ranges from 0.282510 to 0.282652, the εHf(t) value ranges from −4.5 to 0.2, and the two−stage model age ranges from 1541 Ma to 1240 Ma.
Based on the characteristics of regional tectonic evolution, it is deduced that these porphyries formed by partial melting of the Middle Proterozoic Jinshuikou Group under the Late Triassic post−collisional extension environment, and experienced magma mixing by mantle−derived materials.
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Tectonic unit map of the Tibetan Plateau (a), geological map of mining area (b) and photographs of rock outcrops in different alteration zones (c~f)
Schematic diagrams of exploration line profile of line 5 (a) and line 0 (b) in the Qingshuihe Donggou molybdenum deposit
The hand specimen (a~c, g~i) and microscopic (d~f, j~o) photos of rock ore in the Qingshuihe Donggou deposit
Mineral formation sequence diagram of porphyry molybdenum deposit in the Qingshuihe Donggou
TAS (a), AFM (b), SiO2− K2O (c) and A/CNK−A/NK (d) diagrams of the granitic porphyry rocks in the Qingshuihe Donggou deposit
Chondrite-normalized REE distribution pattern (a) and primitive mantle-normalized trace element spider diagram (b) of the porphyry in the Qingshuihe Donggou deposit
Zircon CL images (a, b), LA−ICP−MS U−Pb concordia plot (b, c) and value of weighted mean age(e, f) of the granodiorite porphyry and diorite porphyrite in the Qingshuihe Donggou deposit
Zr+Nb+Ce+Y−(K2O+Na2O)/CaO(a), Zr+Nb+Ce+Y−TFeO/MgO(b), QAP(c) and C/MF−A/MF(d) diagrams of the porphyry in the Qingshuihe Donggou deposit
t−εHf(t) diagram(a) and 与t−176Hf/177Hf diagram(b) of the granodiorite porphyry and diorite porphyrite in the Qingshuihe Donggou deposit
YbN−(La/Yb)N (a), Yb−Sr (b), (Y+Nb)−Rb (c) and Y−Nb (d) tectonic environment diagrams of the porphyry in the Qingshuihe Donggou deposit
Diagrams of Ce−Ce/Sm(a) and La−La/Sm(b) of the porphyry in the Qingshuihe Donggou deposit