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Geochemistry and petrogenesis of Lianyang granite composite,west Guangdong province.

GAO JianFeng LING HongFei SHEN WenZhong LU JianJun ZHANG Min HUANG GuoLong TAN ZhengZhong 1.State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China2.Research Institute No.290,CNNC,Shaoguan 512026,China  
Zircon U-Pb dating of the Yanshanian Lianyang composite granites yields ages of 144.3±0.8Ma (the Lianyang granite) and 106.4±0.7Ma (the Baijiang granite),which suggests that the Lianyang granite intruded during the early Yanshanian period and the Baijiang granite intruded during the later Yanshanian period.The Yanshanian Lianyang composite granites is characterized by metaluminous,high SiO_2 and K_2 O in main elements.It is highly depleted in Ba,Sr,Ti,but slightly depleted in Nb and Ta.The Lianyang and Baijiang granites show similar REE characteristics.They have high concentrations of REE (187.60~300.59×10~(-6) and 185.49~294.27×10~(-6)),respectively.They are enriched in LREE relative to HREE (LREE/HREE) ratios=4.17~9.28 and 4. 13~7.08 and (La/Yb)_N=3.66~9.03 and 3.29~5.16,respectively.Both of the granites show prominent negative Eu anomaly with δEu value of 0.04~0.53 and 0.04~0.16,respectively.Isotope geochemistry study reveals moderate ε_(Nd)(t) values of the Lianyang granite (-9.1~-7.6) and the Baijiang granite (-9.8~-7.8).They have low Nd model ages (1.54~1.71Ga) relative to other granites in southern China.All these features suggest that the Lianyang granite composite was derived from partial melting of the Mesoproterozioc continental crust under a tectonic setting of crust shear-extension system during the Yanshanian period.
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