吉林白山新路花岗闪长斑岩LA-ICP-MS锆石U-Pb定年、地球化学特征及构造意义
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摘要
对吉林白山新路花岗闪长斑岩进行岩相学、LA-ICP-MS锆石U-Pb定年和岩石地球化学的研究,以确定其形成时代和构造背景。锆石U-Pb定年的加权平均年龄为163. 3±0. 77 Ma (MSWD=0. 86)。岩石地球化学分析结果表明新路花岗闪长斑岩具有高Na_2O、K_2O含量,K_2O/Na_2O的比值为0. 78～1. 20,低MgO含量,A/CNK值为1. 01～1. 09,富集Ba、Cs、K、Sr等大离子亲石元素,亏损Nb、Ti、P等高场强元素,轻重稀土元素分馏明显。δEu值为0. 93～1. 06,属于弱过铝质钙碱性系列I型花岗岩。新路花岗闪长斑岩的Sr/Y比值为47. 9～57. 0,LaN/YbN的比值为15. 67～17. 44,为埃达克质花岗岩。新路花岗闪长斑岩的成因为板块汇聚过程中下地壳增厚所导致部分熔融,结合区域构造演化背景,推测新路花岗闪长斑岩是在古太平洋板块向欧亚大陆俯冲时的构造环境中形成。
Petrography,LA-ICP-MS zircon U-Pb dating and lithogeochemistry data have been obtained from Xinlu granodiorite porphyry in Baishan area of Jilin Province to determine the formation age and tectonic background. The zircon U-Pb dating confirms that the weighted mean diagenetic age is 163. 3 ± 0. 77 Ma( MSWD =0. 86). The analysis results of lithogeochemistry show that the Xinlu granodiorite porphyry has high Na_2 O and K_2 O contents,Na_2 O/K_2 O of 0. 78 ～ 1. 20,low MgO content,and A/CNK value of 1. 01 to 1. 09. It is enriched in large ion lithophile elements Ba and Cs,K,Sr,but depleted in high field strength elements Nb,Ti and P,with obvious light and heavy rare earth element fractionation,and δEu of 0. 93 ～ 1. 06,which belongs to weak peraluminous calc-alkaline series I-type granites. The Sr/Y ratio of Xinlu granodiorite porphyry is 47. 9 ～ 57. 0,and LaN/YbNis15. 67 ～ 17. 44,indicating that it belongs to adakite. The lithogenesis of Xinlu granodiorite porphyry is partial melting due to the thickening of the lower crust during the plate convergence. Combined with the regional tectonic evolution background,the authors speculate that the Xinlu granodiorite-porphyry was formed in the tectonic environment when the subduction of the Paleo-Pacific Plate to the Eurasian Plate occurred.
Petrography,LA-ICP-MS zircon U-Pb dating and lithogeochemistry data have been obtained from Xinlu granodiorite porphyry in Baishan area of Jilin Province to determine the formation age and tectonic background. The zircon U-Pb dating confirms that the weighted mean diagenetic age is 163. 3 ± 0. 77 Ma( MSWD =0. 86). The analysis results of lithogeochemistry show that the Xinlu granodiorite porphyry has high Na_2 O and K_2 O contents,Na_2 O/K_2 O of 0. 78 ～ 1. 20,low MgO content,and A/CNK value of 1. 01 to 1. 09. It is enriched in large ion lithophile elements Ba and Cs,K,Sr,but depleted in high field strength elements Nb,Ti and P,with obvious light and heavy rare earth element fractionation,and δEu of 0. 93 ～ 1. 06,which belongs to weak peraluminous calc-alkaline series I-type granites. The Sr/Y ratio of Xinlu granodiorite porphyry is 47. 9 ～ 57. 0,and LaN/YbNis15. 67 ～ 17. 44,indicating that it belongs to adakite. The lithogenesis of Xinlu granodiorite porphyry is partial melting due to the thickening of the lower crust during the plate convergence. Combined with the regional tectonic evolution background,the authors speculate that the Xinlu granodiorite-porphyry was formed in the tectonic environment when the subduction of the Paleo-Pacific Plate to the Eurasian Plate occurred.
引文
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