华南地质2025，Vol.41Issue(4)：741-754,14.DOI:10.3969/j.issn.2097-0013.2025.04.006
西大别新发现印支期长英质岩石
Newly Discovered Indosinian Felsic Rocks in the Western Dabie Orogen
摘要
Abstract
A suite of magnetite-albite leptite was identified at the margin of the Dalishan pluton in the western Dabie orogen.LA-ICP-MS zircon U-Pb dating yielded a crystallization age of 236±1 Ma,indicating contemporaneous magmatic activity might occurr in the western Dabie region during the Indosinian period,alongside the high-pressure/ultra-high-pressure metamorphism.The albite leptite is characterized by high contents of SiO2,Al2O3,and Na2O,while the Dalishan granite is also rich in SiO2,Al2O3,and total alkalis.Both share similar trace and rare earth element characteristics,showing relative depletion in Ba and Sr,pronounced negative Eu anomalies,and enrichment in light rare earth elements.The εNd(t)values define a trend subparallel to the average continental crust evolution line.We propose that the albite leptite likely represents dikes or volcanic rocks formed by melts extracted from the Daleishan pluton during the Indosinian tectonic-thermal event,which were subsequently emplaced along detachment faults or ductile shear zones at the edge of the pluton.关键词
西大别造山带/印支期/钠长浅粒岩/大磊山花岗岩Key words
Western Dabie region/Indosinian/albite leptite/Daleishan granite分类
天文与地球科学引用本文复制引用
刘浩,徐扬,邓新,魏运许,徐大良,张维峰..西大别新发现印支期长英质岩石[J].华南地质,2025,41(4):741-754,14.基金项目
中国地质调查局花岗岩成岩成矿地质研究中心开放基金课题(PM202307)、中国商务部对外援助项目([2021]28)和中国地质调查局项目(DD202501027) （PM202307）
