【摘 要】
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In the eastern Nanling Range there exists the early Yanshanian syenite-granite assemblage. A representative example is the Pitou-Tabei complex composed of the T
【机 构】
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State Key Laboratory of Mineral Deposits Research,Tianjin Institute of Geology and Mineral Resources
论文部分内容阅读
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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