现代地质2011，Vol.25Issue(2)：189-200,12.
金沙江-哀牢山断裂带几个富碱斑岩体的锆石U-Pb定年及地质意义
Zircon U-Pb Dating of Several Selected Alkali-rich Porphyries from the Jinshajiang-Ailaoshan Fault Zone and Geological Significance
摘要
Abstract
By using LA-ICP-MS zircon U-Pb dating, the ages of four alkali-rich porphyries from the Jinshajiang-Ailaoshan fault zone have been determined.The results show that the age of the Jianchuan hornblende syenite porphyry is ( 37.6 ± 2.2 ) Ma, the age of Yaoan biotite hornblende syenite porphyry is ( 31.8 ± 2.6 ) Ma and that of Jiudingshan porphyritic biotite adamellite is (37.93 ± 0.82 ) Ma.There are, however, two ages for Yaoan biotite monzonitic porphyry, (36.86 ±0.63) Ma and (40.41 ±0.24) Ma, respectively.The formation ages of these four porphyries are consistent with the peak timing of formation of the Cenozoic alkali-rich prophyries in western Yunnan, and all in the time frame of the post-collision magmatism of the Tibetan Plateau.It is believed that the emplacement of the porphyries was a magmatic response to India-Eurasia collision.关键词
富碱斑岩/金沙江-哀牢山断裂带/LA-ICP-MS锆石U-Pb定年/新生代/岩浆作用Key words
alkali-rich porphyry/ Jinshajiang-Ailaoshan fault zone/ LA-ICP-MS zircon U-Pb dating/ Cenozoic/ magmatism分类
天文与地球科学引用本文复制引用
李勇,莫宣学,喻学惠,黄行凯,和文言..金沙江-哀牢山断裂带几个富碱斑岩体的锆石U-Pb定年及地质意义[J].现代地质,2011,25(2):189-200,12.基金项目
国家重点基础研究发展计划"973"项目(2009CB421000) （2009CB421000）
国家自然科学基金项目(40972049,40572046). （40972049,40572046）
