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广东新丰新坪花岗闪长岩(104 Ma)地球化学、锆石U-Pb年龄和Hf同位素研究
Received:April 29, 2019  Revised:September 05, 2019  点此下载全文
引用本文:LI Hongwei,QU Shangxia,LIN Xiaoming,XIAO Guangming,HUANG Jianhua,LIAO Bingbing. Petrogeochemistry, zircon U-Pb age and Hf isotope of Xinping granodiorite(104Ma) in Xinfeng area, Guangdong Province[J]. Geology in China, 2021, 48(5): 1524-1539(in Chinese with English abstract).
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Author NameAffiliation
LI Hongwei Guangdong Geological Survey, Guangzhou 510080, Guangdong, China 
QU Shangxia Geological Survey Institute of Guanghzou, Guangzhou 510440, Guangdong, China 
LIN Xiaoming Guangdong Geological Survey, Guangzhou 510080, Guangdong, China 
XIAO Guangming Guangdong Geological Survey, Guangzhou 510080, Guangdong, China 
HUANG Jianhua Guangdong Geological Survey, Guangzhou 510080, Guangdong, China 
LIAO Bingbing Guangdong Geological Experiment and Testing Center, Guangzhou 510080, Guangdong, China 
中文关键词:花岗闪长岩  铜钼矿化  U-Pb年龄  地球化学  Hf同位素  矿产资源调查工程  新丰  广东
Petrogeochemistry, zircon U-Pb age and Hf isotope of Xinping granodiorite(104Ma) in Xinfeng area, Guangdong Province
Abstract:Located in the north-central part of the Fogang complex pluton, the Xinping Cu-Mo mineralization granodiorite pluton formed in late Early Cretaceous, and its LA-ICP-MS zircon U-Pb age is (104.6±1.8)Ma(MSWD=1.2). The granodiorite is characterized by medium acidity (SiO2=63.43%-65.27%), quasi-aluminium(ACNK=0.76-0.92), medium alkali(ALK=6.09%-7.63%) and high-K Calc-alkaline. It shows enrichment in light rare earth elements Rb, U, Th and La, and the ratio of LREE/HREE is 8.26-13.20 while (La/Yb)N is 8.17-16.64. Otherwise, it shows depletion in Nb, Ta, Ti, P, Ba and Sr, with minor loss of Eu (δEu=0.73-0.87). The εHf(t) range from -3.0 to +0.2, and the two-stage model age of Hf(tDM2) is 1.16-1.36Ga, and the index of Mg(Mg#) is 42.64-46.95. All of these indicate that the source rocks are mainly crustal materials formed in Mesoproterozoic, with the participation of deficient mantle components. The ratio of Nb/U and Nb/La is respectively 0.20-0.38 and 1.7-2.2, which indicates that the source area is affected by the fluid metasomatism in subduction of Paleo-Pacific Plate. This study shows that the Xinping granodiorite is dominated by partial melting in process of diageneesis. The Xinping pluton formed in the extensional setting under the subduction of the Paleo-Pacific plate in late Yanshanian period, which is related to the partial melting of the Mesoproterozoic crystalline basement induced by the basaltic magma. In late Early Cretaceous, it was an important Cu-Au-Mo mineralization period in late Mesozoic in southeastern China, while the Xinping granodiorite, located in the middle east of Nanling mountains, coincide with the diagenetic age of the Zijinshan copper polymetallic rocks or ores in the southwestern Fujian Province, with similar petrochemical characteristics. Also, the obvious copper-molybdenum mineralization can be observed in the field, so it will have a good prospecting prospect for copper-molybdenum deposits.
keywords:granodiorite  Cu-Mo mineralization  U-Pb age  geochemistry  Hf isotope  mineral survey engineering  Xinfeng  Guangdong
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