Geochronology, petrogenesis, and tectonic significance of the latest Devonian–early Carboniferous I-type granites in the Central Tianshan, NW China | |
Jiyuan Yin; Wen Chen; Wenjiao Xiao; Chao Yuan; Bin Zhang; Keda Cai; Xiaoping Long | |
刊名 | Gondwana Research |
2017 | |
卷号 | 47页码:188-199 |
关键词 | I-type Granite northern Tianshan Ocean slab Roll-back central Tianshan |
英文摘要 | The latest Devonian–early Carboniferous granitic intrusions in the Central Tianshan block are composed mainly of monzogranites and granodiorites. Here we present the petrology, geochemistry, and in situ zircon U–Pb ages and Hf isotopes of these intrusions. Bulk geochemistry suggests that the monzogranites and granodiorites are high-K, calc-alkaline, I-type granites. LA-ICP-MS zircon dating shows that the monzogranites and granodiorites formed at ca. 362 Ma and ca. 354 Ma, respectively. They are characterized by relatively high initial 176Hf/177Hf ratios (0.282571–0.282764) and positive εHf(t) values (+2.1 to +7.2). We interpret them to have been derived from partial melting of the Mesoproterozoic metamorphic basement of the Tianshan block and a significant addition of juvenile material. Compared to the monzogranites, the granodiorites are characterized by higher Sr (373–599 ppm), low Y (12.5–20.5 ppm), and Yb (1.21–2.04 ppm) contents, with relatively higher Sr/Y (26–32) ratios, analogous to those of modern adakitic rocks. The differences in geochemical characteristics between the monzogranites and granodiorites may reflect differences in the P–T conditions experienced by the two lithologies during partial melting. We propose that the latest Devonian monzogranites were possibly generated by partial melting of the Tianshan Mesoproterozoic basement rock with an influx of juvenile material in an arc setting. However, the granodiorites were likely related to the slab roll-back of subducted north Tianshan Ocean during the early Carboniferous. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/10105] |
专题 | 地球化学研究所_矿床地球化学国家重点实验室 |
作者单位 | 1.Department of Geology, Northwest University, Xi'an 710069, China 2.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 3.Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China 4.CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China 5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 6.State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 7.Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
推荐引用方式 GB/T 7714 | Jiyuan Yin;Wen Chen;Wenjiao Xiao;Chao Yuan;Bin Zhang;Keda Cai;Xiaoping Long. Geochronology, petrogenesis, and tectonic significance of the latest Devonian–early Carboniferous I-type granites in the Central Tianshan, NW China[J]. Gondwana Research,2017,47:188-199. |
APA | Jiyuan Yin;Wen Chen;Wenjiao Xiao;Chao Yuan;Bin Zhang;Keda Cai;Xiaoping Long.(2017).Geochronology, petrogenesis, and tectonic significance of the latest Devonian–early Carboniferous I-type granites in the Central Tianshan, NW China.Gondwana Research,47,188-199. |
MLA | Jiyuan Yin;Wen Chen;Wenjiao Xiao;Chao Yuan;Bin Zhang;Keda Cai;Xiaoping Long."Geochronology, petrogenesis, and tectonic significance of the latest Devonian–early Carboniferous I-type granites in the Central Tianshan, NW China".Gondwana Research 47(2017):188-199. |
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