滇西腾冲—梁河古近纪花岗岩锆石U-Pb定年、Hf同位素及地球化学
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云南1:5万梁河县、江东、帕底幅区域地质调查项目 (1212010784007)


Zircon U-Pb Geochronology, zircon Hf Isotope and bulk Geochemistry of Paleogene Granite in Tengchong-Lianghe Area, Western Yunan
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    内容提要:滇西腾冲–梁河地区发育古近纪二长花岗岩和钾长花岗岩,记录了印度–欧亚大陆碰撞的岩浆活动信息。二长花岗岩的锆石U-Pb年龄为51.4±0.4Ma,其176Hf/177Hf比值为0.282554~0.282592,εHf(t)= -6.65~-5.30,其二阶段模式年龄为1.46~1.55Ga。腾冲–梁河古近纪花岗岩以高SiO2 (68.96%~78.68%)、高K2O (4.56%~6.29%)和高Al2O3(12.40%~16.42%)为特征,K2O/Na2O比值为0.93~7.24,Al2O3>(K2O+Na2O),A/CNK值为0.99~2.31,属于富钾钙碱性偏铝–强过铝质花岗岩;绝大多数样品具有强烈的负Eu异常(Eu/Eu*为0.19~0.51),富集Cs、Rb,亏损Sr、P、Ti、Ba、Nb、Ta,具有Pb的正异常。元素地球化学特征指示,其主要源于区域上地壳变质杂砂岩的部分熔融;结合区域地质,认为腾梁地区62~51Ma的花岗岩是对印度–欧亚大陆碰撞高峰期的岩浆响应。

    Abstract:

    Paleogene adamellite and feldspar granite developed in Tengchong-Lianghe area, Western Yunnan, recorded magmatism information in the collision between Indian and Asian continents. The LA-ICP-MS zircon U-Pb age of typical adamellite is 51.4±0.4Ma, and Hf modal ages are 1.46-1.55Ga, εHf(t) values are -6.65 to -5.30. Major elements of Paleogene granite from Tengchong-Lianghe area, are characterized by high SiO2 (68.96%-78.68%), K2O (4.56%-6.29%) and Al2O3(12.40%-16.42%), and have K2O/Na2O ratios of 0.93-7.24, A/CNK values of 0.99 to 2.31 with Al2O3>(K2O+Na2O),belong to metaluminous-strongly peraluminous high K calc-alkaline granite; Their trace elements show strong negative Eu anomalies with Eu/Eu*values of 0.19 to 0.51, enrichment of Cs, Rb, Pb but depletion of Sr、P、Ti、Ba、Nb、Ta. Elements geochemical features signified that these granites might be generatedfrom upper crust by partial melting of metagraywacke. Based on the regional geology, we suggested Tengliang granites (62-51Ma) magmatic response events on the peak period of India-Asia collision.

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高永娟,林仕良,丛峰.2014.滇西腾冲—梁河古近纪花岗岩锆石U-Pb定年、Hf同位素及地球化学[J].地质学报,88(1):63-71.
gaoyongjuan,林仕良,congfeng.2014. Zircon U-Pb Geochronology, zircon Hf Isotope and bulk Geochemistry of Paleogene Granite in Tengchong-Lianghe Area, Western Yunan[J]. Acta Geologica Sinica,88(1):63-71.

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  • 收稿日期:2012-07-20
  • 最后修改日期:2013-04-19
  • 录用日期:2013-07-05
  • 在线发布日期: 2014-01-24
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