Tectonic evolution of the South Altyn, NW China: constraints by geochemical, zircon U-Pb and Lu-Hf isotopic analysis of the Palaeozoic granitic plutons in the Mangya area

被引:11
作者
Xu, Nan [1 ]
Wu, Cai-lai [1 ]
Gao, Yuan-Hong [1 ]
Lei, Min [1 ]
Zheng, Kun [1 ]
Gao, Dong [1 ]
机构
[1] Chinese Acad Geol Sci, Key Lab Deep Earth Dynam MLR, Inst Geol, Beijing 100037, Peoples R China
基金
中国国家自然科学基金;
关键词
South Altyn Orogenic Belt; Mangya; early Palaeozoic; zircon U-Pb and Lu-Hf isotopic data; NATURAL REFERENCE MATERIAL; PLASMA-MASS SPECTROMETRY; SUBDUCTION; ALTUN; DISCRIMINATION; GEOCHRONOLOGY; ROCKS; BELT; CLASSIFICATION; PETROGENESIS;
D O I
10.1017/S0016756820000126
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The South Altyn Orogenic Belt (SAOB) is one of the most important orogenic belts in NW China, consisting of the South Altyn Continental Block and the Apa-Mangya Ophiolitic Melange Belt. However, its Palaeozoic tectonic evolution is still controversial. Here, we present petrological, geochemical, zircon U-Pb and Lu-Hf isotopic data for the Mangya plutons with the aim of establishing the Palaeozoic tectonic evolution. We divide the Early Palaeozoic magmatism in the Apa-Mangya Ophiolitic Melange Belt into four episodes and propose a plate tectonic model for the formation of these rocks. During 511-494 Ma, the South Altyn Ocean (SAO) was in a spreading stage, and some shoshonite series, I-type granitic rocks were generated. From 484 to 458 Ma, the oceanic crust of the SAO subducted northward, accompanied by large-scale magmatic events resulting in the generation of vast high-K calc-alkaline series, I-type granitic rocks. During 450-433 Ma, the SAO closed, and break-off of the subducted oceanic slab occurred, with the generation of some high-K calc-alkaline series, I-S transitional type granites. The SAOB was in post-orogenic extensional environment from 419 to 404 Ma, and many A-type granites were generated.
引用
收藏
页码:1121 / 1143
页数:23
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