Citation: | ZOU Jian, TANG Wenlong, DING Zhengjiang, BO Junwei, LI Zhiqiang, YU Sen. 2021. Zircon U-Pb dating of the Yuangezhuang pluton in Muping of Shandong Province and its constraints on mineralization of Cu-Mo deposits[J]. Geology in China, 48(3): 883-899. doi: 10.12029/gc20210316 |
The Yuangezhuang Pluton located in the east of Jiaodong area,is formed in the late Yanshanian and is one of the granites associated with Cu-Mo polymetallic deposits hosted inporphyry and skarn. LA-ICP-MS zircon U-Pb dating of Yaxi unite,Houye unite and Xishangzhai unite from the Yuangezhuang monzonitic granite yields (118.10±0.66) Ma,(118.52±0.78) Ma,and (118.80±0.67) Ma respectively,indicating the Late Epoch of Early Cretaceous. The results of petrochemistry indicate the pluton is belong to high-K calc-alkaline serie (K2O/Na2O=1.00-1.29,A/CNK=0.98-1.02). The results of trace elements are characterized by dramatic fractionation between light REE and heavy (REE(La/Yb)N=26.91~35.75 unapparent Eu anomalies (δEu=0.84-0.93),enriched in LILE (i.e. Rb,K,U) and loss in HSFE (i.e. Nb,Ti,P). The geochemical characteristics indicate the Yuangezhuang pluton is an I type granite,crust-mantle syntectic granite. The pluton has strong constrain on spatial distribution and metallogenic epoch of Cu-Mo deposits.
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Regional geological map of Jiaodong area showing the distribution of main gold, copper and molybdenum deposits(after Li Chao et al., 2016)
Regional geological map of the Yuangezhuang area((afte No.3 Exploration Institute of Geology and Mineral Resources, Shandong Province, 1990)
Geological characteristics of Yuangezhuang pluton
Representative CL images and U-Pb ages of zircons from samples 2017N1 collected from Yaxi unite
LA-ICP-MS zircon U-Pb concordia diagram of samples 2017N1 form Yaxi pluton
Representative CL images and U-Pb ages of zirons from samples 2017N2 collected from Houye unite
LA-ICP-MS zircon U-PbConcordia diagram of samples 2017N2 form Houye unite
Representative CL images and U-Pb ages of zirons from samples 2017N3 collected from Xishangzhai unite
LA-ICP-MS zircon U-Pb Concordia diagram of samples 2017N3 from Xishangzai unite
Geochemical classification diagrams of granite
Chondrite-normalized REE patterns(a, chondrite normalized values after Boynton, 1984) and primitive mantle-normalized traceelement spidergrams (b, primitive mantle normalized values after Sun et al., 1989) for the Yuangezhuang pluton
Diagram showing the genetic type of the I-type granite
SiO2 vs. P2O5 diagram
The diagrams of (Y+Nb) vs. Pb and Y vs. Nb(after Pearce et al., 1984)
Sketch geological section along No.18 exploration line in the Kong Xintou Cu-Mo deposit, Muping