| 浙江治岭头地区霏细岩锆石U-Pb年龄、地球化学特征及形成背景 |
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| 引用本文： | 华杰雄,刘汉仑.浙江治岭头地区霏细岩锆石U-Pb年龄、地球化学特征及形成背景[J].世界地质,2022(1):26-37. |
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| 作者姓名： | 华杰雄 刘汉仑 |
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| 作者单位： | 浙江省遂昌金矿有限公司;中国地质科学院矿产资源研究所 |
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| 基金项目： | 中国地质调查局地质调查二级项目(DD20201173)。 |
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| 摘 要： | 通过对浙江治岭头地区的霏细岩进行较为系统的LA-ICP-MS锆石U-Pb定年及全岩地球化学分析,探讨了晚白垩世华南地区的构造演化.定年结果显示霏细岩年龄为(98.31±0.92)Ma,为燕山期岩浆侵入活动的产物.岩石为高钾钙碱性偏铝质系列,富SiO2(68.17％～72.90％)、Al2 O3(13.58％～16.07...
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| 关 键 词： | 霏细岩 锆石U-Pb定年 地球化学特征 构造背景 治岭头地区 |
Zircon U-Pb age,geochemical characteristics and formation setting of felsite in Zhilingtou area,Zhejiang Province |
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| HUA Jiexiong,LIU Hanlun.Zircon U-Pb age,geochemical characteristics and formation setting of felsite in Zhilingtou area,Zhejiang Province[J].World Geology,2022(1):26-37. |
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| Authors: | HUA Jiexiong LIU Hanlun |
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| Institution: | (Zhejiang Suichang Gold Mine Co.Ltd.,Lishui 323300,Zhejiang,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | A systematic zircon LA-ICP-MS U-Pb dating and whole rock geochemical analysis were carried out for the felsite in Zhilingtou area,Zhejiang Province,and the tectonic evolution of South China in the Late Cretaceous was discussed.The dating results show that the intrusive age of the felsite is(98.31±0.92)Ma,which is the product of Yanshanian magmatic event.The rocks belong to high potassium,calc-alkaline,metaluminous series,and are rich in SiO2(68.17%~72.90%),Al2O3(13.58%~16.07%)and K2O(4.75%~5.34%),but poor in Fe2O3(1.17%~1.37%),MgO(0.15%~0.22%)and CaO(1.03%~1.62%).The REE distribution curve is right inclined with obviously negative Eu anomalies.Theirω(ΣREE)=(206.57~222.54)×10-6,LREE/HREE=18.17~19.10,(La/Yb)N=23.56~25.49,andδEu=0.61~0.65.Rb,Th,U and K are relatively enriched,while Nb,Ta,P,Zr and Hf are relatively depleted.The trace element distribution patterns show the enrichment of large ion lithophile elements(LILEs)and light rare earth elements(LREEs),but depletion of high field strength elements(HFSEs)and heavy rare earth elements(HREEs),which are similar to the characteristics of I-type granites.Combined with the petrogenesis,tectonic environment discrimination and regional tectonic evolution processes,the formation of the felsite in Zhilingtou area is closely related to the subduction of the Paleo-Pacific Ocean.The area was dominated by the subduction of the Paleo-Pacific plate from the Late Jurassic to early Late Cretaceous,combined with the extensional structure of the same period,accompanied by a large number of basaltic magma underplating and upwelling,resulting in the generation of a large number of granitic magma,and with the gradual participation of mantle components,felsite in this area was formed. |
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| Keywords: | felsite zircon U-Pb dating geochemical characteristics tectonic background Zhilingtou area |
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