中国地质Issue(1)：111-119,9.
哀牢山构造带南段扭只二长花岗斑岩地球化学特征及其锆石U-Pb年代学研究
Petrogeochemistry and zircon U-Pb chronology of the Niuzhi monzonitic porphyry in southern segment of Ailao Mountain tectonic belt
摘要
Abstract
This study presents bulk petrogeochemistry and zircon U-Pb dating results for the Niuzhi monzonitic porphyry in Mojiang, Yunnan. LA-ICP-MS zircon U-Pb dating results show that the Niuzhi monzonitic porphyry formed in the Late Permian (263.5 ±1.7Ma). The Niuzhi monzonitic porphyry is characterized by SiO2 content of 55.30%-74.37%, alkali (Na2O+K2O) 2.56%-7.57%, and Na2O higher than K2O. It is enriched in LREE and Sc, Co, Cs, As, and depleted in Cr, Ni, Zn, Rb, Sr, Ba, Zr, Ta, Th, U, W, with negative Eu anomalies (δEu 0.74-1.06). According to the diagrams, the Niuzhi monzonitic porphyry formed in the tectonic environment of island arc-continent or continental-arc collision,indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailaoshan tectonic belt may have been closed in the Late Permian (263.5 ± 1.7Ma).关键词
二长花岗斑岩/锆石U-Pb年代学/岩石地球化学/同碰撞期花岗岩Key words
monzonitic porphyry/zircon U-Pb chronology/petrogeochemistry/syn-collisional granite分类
天文与地球科学引用本文复制引用
孙崇波,李忠权,王道永,许远平,李友余..哀牢山构造带南段扭只二长花岗斑岩地球化学特征及其锆石U-Pb年代学研究[J].中国地质,2016,(1):111-119,9.基金项目
中国地质调查局项目（1212010880406、1212011120582）资助。 （）
