| Petrogenesis and significance of early Yanshanian syenite-granite complex in eastern Nanling Range |
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| 作者姓名： | CHEN Peirong ZHOU Xinmin ZHANG Wenlan LI Huimin FAN Chunfang SUN Tao CHEN Weifeng & ZHANG Min . State Key Laboratory of Mineral Deposits Research |
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| 作者单位： | CHEN Peirong1，ZHOU Xinmin1，ZHANG Wenlan1，LI Huimin2，FAN Chunfang1，SUN Tao1，CHEN Weifeng1 & ZHANG Min1 1. State Key Laboratory of Mineral Deposits Research，Department of Earth Sciences，Nanjing University，Nanjing 210093，China; 2. Tianjin Institute of Geology and Mineral Resources，China Geological Survey，Tianjin 300170，China |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | According to the statistics for granitoid distribution map of 1/2000000 Nanling region1], the granitoids in the Nanling region sum up an area of more than 170000 km2, occupying about one fifth of the entire Nanling region. Granitoid rocks in the Nanlingregion are mainly composed of monzogranites (occu- pying more than 84%), granodiorites (about 11%) and syenogranites (about 3%)2]. There also exists a small amount of syenites (0.12%) with a sum area of about 94 km22]. However, nearly half …
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Petrogenesis and significance of early Yanshanian syenite-granite complex in eastern Nanling Range |
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| CHEN Peirong,ZHOU Xinmin,ZHANG Wenlan,LI Huimin,FAN Chunfang,SUN Tao,CHEN Weifeng & ZHANG Min . State Key Laboratory of Mineral Deposits Research,.Petrogenesis and significance of early Yanshanian syenite-granite complex in eastern Nanling Range[J].Science in China(Earth Sciences),2005,48(7). |
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| Authors: | CHEN Peirong ZHOU Xinmin ZHANG Wenlan LI Huimin FAN Chunfang SUN Tao CHEN Weifeng ZHANG Min |
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| Institution: | 1. State Key Laboratory of Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China
2. Tianjin Institute of Geology and Mineral Resources, China Geological Survey, Tianjin 300170, China |
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| Abstract: | In the eastern Nanling Range there exists the early Yanshanian syenite-granite assemblage. A representative example is the Pitou-Tabei complex composed of the Tabei syenite pluton and the Pitou syenogranite pluton in southern Jiangxi Province. U-Pb zircon dating yields ages of 188.6±2.2 Ma for the Tabei pluton and 186.3±1.1 Ma for the Pitou pluton. The Tabei syenite is characterized by relatively low SiO2 content (62.40%- 68.75%), high alkalis (K2O+Na2O = 10.56%- 11.96%), low percent K2O/Na2O ratios (0.56-0.93), metaluminous feature (A/CNK = 0.80-1.00), enrichment in LILE (Rb, Ba, K) and HFSE (Th, U, Nb, Ta, Zr, and so on), weakly negative to positive Eu anomalies (δEu = 0.63-1.82), relatively low (87Sr/86Sr)i (0.70412-0.70543), and relatively high εNd(t) (3.14-3.52). The Pitou syenogranite is characterized by high silicon content (SiO2 = 71.06%-76.28%), relatively low alkalis (K2O+Na2O =8.10%-9.80%), high percent K2O/Na2O ratios (1.22-1.94), metaluminous feature (A/CNK =0.94-1.07), enrichment in Rb, Th (U), K, depletion in Ba, Nb, Ta, Sr, P, Zr, Ti, high ΣREE (averaging 451.03 μg/g), strong negative Eu anomalies (δEu = 0.27-0.33), relatively high (87Sr/86Sr)i (0.70805-0.70912), and relatively low εNd(t) (-5.35--6.29). The Tabei syenite and Pitou syenogranite both have the characteristics of A-type granites. The former is considered to be from the asthenosphere mantle, and the latter was the product of the crust-mantle mixture.They both were probably formed in a rifting setting. |
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| Keywords: | syenite-granite assemblage single zircon U-Pb age rifting environment Nanling Range |
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