摘要
出露于临沧巨型花岗岩带东侧的半坡基性—超基性杂岩体为研究古特提斯起源提供了重要载体。近期在半坡杂岩体变质蛇纹岩或辉长岩中识别出了呈脉状或团块状产出于的钙长石质斜长岩,其锆石U-Pb年龄为290±2 Ma。结合其它区域资料表明,在昌宁—孟连古特提斯主洋盆演化的过程中,半坡—景洪一带曾发育着早二叠世早期打开的弧后盆地。
Banpo mafic-ultramafic complex, to the E side of Lincang giant granite zone, is the important ob- ject in the study on origin of Tethys. Recently, the veined or nodular anorthite anorthosite has been identified in the metamorphic serpentite or gabbro of Banpo complex, with zircon U-Pb age 290 ～ 2 Ma. In combination with other regional information, there was a back-arc basin developed in Banpo-Jinghong area in the evolution of Changning-Menglian Tethyan ocean basin, which was opened in Early Permian.
出处
《云南地质》
2015年第3期340-345,共6页
Yunnan Geology
基金
国家自然科学基金项目
编号:41190073
