Tectonic evolution of the South Tianshan orogen and adjacent regions, NW China: geochemical and age constraints of granitoid rocks

被引:992
作者
Gao, Jun [1 ]
Long, Lingli [2 ]
Klemd, Reiner [3 ]
Qian, Qing [1 ]
Liu, Dunyi [4 ]
Xiong, Xianming [5 ]
Su, Wen [1 ]
Liu, Wei [1 ]
Wang, Yitian [6 ]
Yang, Fuqun [6 ]
机构
[1] Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
[2] Beijing Inst Geol Mineral Resources, Beijing 100012, Peoples R China
[3] Univ Erlangen Nurnberg, GeoForschungszentrum Nordbayern, D-91054 Erlangen, Germany
[4] Chinese Acad Geol Sci, Beijing SHRIMP Ctr, Beijing 100037, Peoples R China
[5] Guizhou Univ, Coll Resources & Environm Engineer, Guiyang 550003, Peoples R China
[6] Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
基金
中国国家自然科学基金;
关键词
South Tianshan; Granitoids; SHRIMP and LA-ICP-MS zircon geochronology; Tectonic evolution; ULTRAHIGH-PRESSURE METAMORPHISM; U-PB AGE; CARBONIFEROUS VOLCANIC-ROCKS; A-TYPE GRANITES; HP-LT ROCKS; WESTERN TIANSHAN; TIEN-SHAN; SOUTHWESTERN TIANSHAN; CONTINENTAL GROWTH; NORTHWEST CHINA;
D O I
10.1007/s00531-008-0370-8
中图分类号
P [天文学、地球科学];
学科分类号
070403 [天体物理学];
摘要
Geochemical and geochronological evidence was obtained from granitoids of the South Tianshan orogen and adjacent regions, which consist of three individual tectonic domains, the Kazakhstan-Yili plate, the Central Tianshan Terrane and the Tarim plate from north to south. The Central Tianshan Terrane is structurally bounded by the Early Paleozoic 'Nikolaev Line-North Nalati Fault' and Late Paleozoic 'Atbashy-Inyl'chek-South Nalati-Qawabulak Fault' zones against the Kazakhstan-Yili and Tarim plates, respectively. The meta-aluminous to weakly peraluminous granitic rocks, which are exposed along the Kekesu River and the Bikai River across the Central Tianshan Terrane, have a tholeiitic, calc-alkaline or high-potassium calc-alkaline composition (I-type). Geochemical trace element characteristics and the Y versus Rb-Nb or Y versus Nb discrimination diagrams favor a continental arc setting for these granitoid rocks. SHRIMP U-Pb and LA-ICP-MS U-Pb zircon age data indicate that the magmatism started at about 480 Ma, continued from 460 to 330 Ma and ended at about 275 Ma. The earlier magmatism (>470 Ma) is considered to be the result of a simultaneous southward and northward subduction of the Terskey Ocean beneath the northern margin of the Tarim plate and the Kazakhstan-Yili plate, respectively. The later magmatism (460-330 Ma) is related to the northward subduction of the South Tianshan Ocean beneath the southern margin of the Kazakhstan-Yili-Central Tianshan plate. The dataset presented here in conjunction with previously published data support a Late Paleozoic tectonic evolution of the South Tianshan orogen, not a Triassic one, as recently suggested by SHRIMP U-Pb zircon dating for eclogites.
引用
收藏
页码:1221 / 1238
页数:18
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