地质通报2024，Vol.43Issue(12)：2190-2203,14.DOI:10.12097/gbc.2024.08.028
阿拉善南部地区石炭纪—二叠纪期间的构造体制转换
Tectonic switching during Carboniferous-Early Triassic within the southern Alxa
摘要
Abstract
Numerous Paleozoic ophiolitic mélange,accretionary complex and plutons are exposed in the Alxa region,located in the central segment of the Central Asian Orogenic Belt,which may record the reworking process of continental crust during the closure of the Paleo-Asian Ocean.In this study,we collected and compiled new published data of zircon U-Pb age,whole-rock major and trace element and zircon Hf isotope for ophiolitic mélange and plutons in the southern Alxa.Based on these new data,we propose that Permian SSZ-type ophiolitic mélange and Middle-Late Permian high-Mg diorites and adakites support the hypothesis that a Permian oceanic slab subduction in the southern Alxa.The zircon U-Pb ages of Carboniferous-Permian magmatism show a younging trend toward the northwest in the southern Alxa region,indicating a northward accretion of the Alxa Block.Temporal-spatial variations of zircon Hf isotope for plutons suggest tectonic switching from advancing to retreating subduction during Carboniferous-Early Triassic within the southern Alxa.关键词
阿拉善/中亚造山带/蛇绿混杂岩/后撤型俯冲带Key words
Alxa/Central Asian Orogenic Belt/ophiolitic mélange/retreating subduction分类
天文与地球科学引用本文复制引用
郑荣国,张进..阿拉善南部地区石炭纪—二叠纪期间的构造体制转换[J].地质通报,2024,43(12):2190-2203,14.基金项目
国家自然科学基金项目《阿拉善地区增生杂岩对岩浆岩带向洋迁移机制的制约》(批准号:42272268)和中国地质调查局项目《古生代—中生代中亚造山带中段洋-陆转换专题地质调查》(编号:DD20230217) （批准号:42272268）
