沉积与特提斯地质2025，Vol.45Issue(3)：634-643,10.DOI:10.19826/j.cnki.1009-3850.2024.05002
滇西漕涧地区晚三叠世瑞替期石英闪长岩的发现及地质意义
Discovery of Late Triassic(Rhaetian)quartz diorite in the Caojian area of western Yunnan and its geological significance
摘要
Abstract
The Chongshan complex belt in western Yunnan is located in the western margin of the southern belt of the Sanjiang orogenic system,specifically in the"peak waist"of the Sanjiang orogenic belt,with strong tectonic compression metamorphism and intense magmatic activity.In the course of geological investigation,the author and the research team newly discovered a set of quartz diorite in the Chongshan complex belt,which underwent low-grade metamorphism.The zircon U-Pb age of 208.2 Ma indicates that it belongs to the Late Triassic Rhaetian age.Geochemical analysis of the rocks shows that it is potassium to high-potassium peraluminous,with high alkali content but low water content,enriched in elements such as Th,U,and Rb,poor in elements such as Sr,Eu,Ba,Ti and P,and it formed in a low oxygen environment.It is concluded that the quartz diorite belongs to the post-orogenic type,and it formed in the post-orogenic extensional stage following the closure and collision orogeny of the Paleo-Tethys Ocean(Changning-Menglian Ocean)of the Indochinese period.The Chongshan complex belt is a complex of the southern section of Chongshan-Lincang block(Lincang magmatic arc)and the Lancang accretionary complex,which is an accretionary complex.关键词
石英闪长岩/瑞替期/后造山型/崇山杂岩带/滇西Key words
quartz diorite/Rhaetian age/post-orogenic type/Chongshan complex belt/western Yunnan分类
天文与地球科学引用本文复制引用
吕伟,黄亮,朱能刚,孙载波,吴清华,方雄,谈树成..滇西漕涧地区晚三叠世瑞替期石英闪长岩的发现及地质意义[J].沉积与特提斯地质,2025,45(3):634-643,10.基金项目
云南省科技厅科技计划项目(202401AT070157,202401AT070012) （202401AT070157,202401AT070012）
云南省新一轮找矿行动暨地勘基金项目(D202306) （D202306）
国家自然科学基金项目(42062005,92055207) （42062005,92055207）
云南省技术创新人才培养对象项目(202305AD160031,202405AD350056) （202305AD160031,202405AD350056）
