黄登鹏,马 涛,李进喜,闫 旺.西藏萨嘎地区布朵淡色花岗岩岩石化学、年代学研究及构造意义[J].甘肃地质,2022,(1):21-28
西藏萨嘎地区布朵淡色花岗岩岩石化学、年代学研究及构造意义
Lithochemistry and Geochronology of Buduo Leucogranite in Saga Region of Tibet and Its Tectonic Implications
  
DOI:
中文关键词:  岩石化学  年代学  构造意义  布朵淡色花岗岩  西藏  萨嘎地区
英文关键词:geochemistry  chronological studies  tectonic implications  Buduo leucogranite  Saga region
基金项目:冈底斯—喜马拉雅铜矿资源基地调查项目(1212011221058)
作者单位
黄登鹏 甘肃省地矿局第三地勘院甘肃 兰州 730050 
马 涛 甘肃省地矿局第三地勘院甘肃 兰州 730050 
李进喜 甘肃省地矿局第三地勘院甘肃 兰州 730050 
闫 旺 甘肃省地矿局第三地勘院甘肃 兰州 730050 
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中文摘要:
      西藏萨嘎地区布朵淡色花岗岩位于喜马拉雅造山带中,属北喜马拉雅造山带的花岗岩。本次研究的萨嘎布朵淡色花岗岩,具高SiO2(72. 26% ~ 73. 05%)、富Al2O3(14. 61% ~ 14. 98%)、高K2O(3. 65% ~ 4. 09%)和Na2O(3. 47% ~ 3. 76%)、低P2O5(0. 09% ~ 0. 12%)的特征,K2O/Na2O = 1. 00 ~ 1. 08、A/CNK = 1. 18 ~ 1. 24,属高钾、过铝质钙碱性S型花岗岩。岩石微量元素变化较大,∑REE = 98. 87 × 10-6 ~ 124. 51 × 10-6、LREE/HREE = 11. 24 ~ 16. 12、Rb = 187 × 10-6 ~ 234 × 10-6、Sr = 311 × 10-6 ~ 409 × 10-6、LaN/YbN = 19. 96 ~ 40. 28、δEu = 0. 89 ~ 0. 99。 布朵淡色花岗岩结晶时间为16. 15 Ma,与区域上的其他的北喜马拉雅淡色花岗岩结晶时间一致,均是形成于陆陆碰撞造山后的伸展背景,代表印度—欧亚大陆后碰撞期的产物,对喜马拉雅造山带的研究有一定的指导意义。
英文摘要:
      Buduo leucogranite in saga region of Tibet is located in the western belt in Tethys Himalayas ,which belongs to the granite belt of northern Himalayan orogenic belt. The saga buduo leucogranite in western belt of northern Himalayan orogenic belt is studied in this paper the research shows that its lithology is two-mica adamellite,with character of high SiO2(72. 26 to 73 .05%),rich Al2O3(14. 61 to 14. 98%),high K2O(3. 65 to 4. 09%) Na2O(3. 47 to 3. 76%) low P2O5(0.09% to 0. 12%) the K2O/Na2O ratios range from 1. 00 to 1.08 the A/CNK ratios range from 1.18 to 1. 24 and belongs to a High K-clac-alkaline granite S series. Trace mineral content differ substantiallythe sum of REE ranges from 98. 87 to 124. 51 ppm、the LREE/HREE ratios range from 11. 24 to 16. 12 the Rb content ranges from 187 ~ 234 ppmthe Sr 311 ~ 409 ppm the LaN/YbN 19. 96 ~ 40. 28 δEu 0. 89 ~ 0. 99. The result of zircon U-Pb dating indicates that the age of the Buduo leucogranite is 16. 15 Main line with the northern Himalayan leucogranite's age range. It is formed in the background of collisional orogeny and represents the product of post-collision between India and Eurasia continentsand the results could guide the study on Himalayan orogen.
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