%0 Journal Article
%T 扬子地块西南缘新元古代辉长岩年代学及其地质意义<br>Neoproterozoic Gabbro Age and Its Geological Significance on the Southwestern Margin of the Yangtze Block
%A 陈丛敏
%J Advances in Geosciences
%P 841-850
%@ 2163-3975
%D 2024
%I Hans Publishing
%R 10.12677/ag.2024.146078
%X 滇西点苍山–哀牢山构造带是扬子地块西南缘的重要组成部分，保存有大量前寒武纪岩石学记录，是探究扬子地块西南缘前寒武纪构造演化历史的良好载体。本文选取点苍山–哀牢山构造带北段点苍山地区的基性岩为研究对象，通过锆石U-Pb年代学测试分析，显示点苍山基性岩的形成时代为779 ± 5 Ma，属于新元古代时期，表明点苍山地区发育新元古代岩浆活动。结合区域地质资料与前人研究成果，扬子地块西南缘的点苍山–哀牢山构造带发育有广泛的新元古代岩浆活动，形成了从酸性岩到基性岩等不同的岩石类型，形成时代主要集中在870~720 Ma，持续时间如此长的岩浆活动可能与扬子地块周缘的持续俯冲有关。<br />
The Diancangshan-Ailaoshan tectonic belt in western Yunnan is a crucial part of the southwestern margin of the Yangtze Block, preserved a wealth of Precambrian petrology records, serving as an excellent medium for exploring the Precambrian tectonic evolutionary history of the southwestern Yangtze Block. This study focuses on the basic rocks from the northern section of the Diancangshan area within the Diancangshan-Ailaoshan tectonic belt. Through zircon U-Pb geochronological testing and analysis, it is revealed that the DianCangshan basic rocks were formed at 779 ± 5 Ma, belonging to the neoproterozoic era, indicating the presence of neoproterozoic magmatic activity in the Diancangshan area. In conjunction with regional geological data and previous research findings, the Diancangshan-Ailaoshan tectonic belt on the southwestern margin of the Yangtze Block has experienced extensive neoproterozoic magmatic activity, resulting in a variety of rock types from acidic to basic rocks, with formation ages predominantly concentrated between 870~720 Ma. The prolonged duration of such magmatic activity may be related to the continuous subduction along the periphery of the Yangtze Block.
%K 新元古代岩浆活动，锆石U-Pb定年，点苍山–哀牢山构造带<br>Neoproterozoic Magmatic Activity
%K Zircon U-Pb Geochronological Testing
%K Diancangshan-Ailaoshan Tectonic Belt
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=90948