LA-ICP-MS U–Pb zircon, columbite-tantalite and 40Ar–39Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China
dc.contributor.author | Zhou, Q. | |
dc.contributor.author | Qin, K. | |
dc.contributor.author | Tang, D. | |
dc.contributor.author | Wang, C. | |
dc.contributor.author | Sakyi, P.A. | |
dc.date.accessioned | 2019-07-11T10:43:11Z | |
dc.date.available | 2019-07-11T10:43:11Z | |
dc.date.issued | 2018-01 | |
dc.description.abstract | The Chinese Altai is renowned for its rich rare-element resources. Nine representative rare-element (REL) pegmatites were dated using LA-ICP-MS and ⁴⁰ Ar– ³⁹ Ar methods. The columbite grains yield a weighted mean ²⁰⁶ Pb/ ²³⁸ U age of 239.6±3.8 Ma for the Dakalasu (Be-Nb-Ta) pegmatite and concordia U–Pb ages of 258.1±3.1 Ma and 262.3±2.5 Ma for the Xiaokalasu (Li-Nb-Ta) pegmatite. The zircons display a weighted mean ²⁰⁶ Pb/ ²³⁸ U age of 198.5±2.5 Ma for the Husite (Be) pegmatite and concordia U–Pb ages of 194.3±1.6 Ma and 248.2±2.2 Ma for the Qunkuer (Be) and Taerlang (barren) pegmatites. The muscovite ⁴⁰ Ar– ³⁹ Ar dating gives plateau ages of 286.4±1.6 Ma, 297.0±2.6 Ma, 265.2±1.5 Ma, 178.8±1.0 Ma, 162.2±0.9 Ma, 237.7±1.3 Ma, 237.4±1.2 Ma and 231.9±1.2 Ma for the Talate (Li-Be-Nb-Ta), Baicheng (Nb-Ta), Kangmunagong (barren), Husite (Be), Qunkuer (Be-Nb-Ta), Xiaokalasu (Li-Nb-Ta), Weizigou (Be) and Taerlang (barren) pegmatites, respectively. These new ages coupled with previous geochronological work suggest that the REL pegmatites in the Chinese Altai formed during early Permain – Late Jurassic time. The REL pegmatites located in the Central Altaishan terrane are younger than those in the Qiongkuer–Abagong terrane, showing a correlation with the coeval and adjacent granites. The formation of the REL pegmatites and these granites indicates frequent and strong magmatic activity in the post-orogenic and anorogenic setting. The spatial and temporal distribution of pegmatites and granites reveals a magmatism path from the SE (of age early–middle Permian), to the NW (middle Permian – Middle Triassic) and finally to the central part (Middle Triassic – Jurassic) of the Chinese Altai. | en_US |
dc.identifier.other | DOI: 10.1017/S0016756816001096 | |
dc.identifier.uri | http://ugspace.ug.edu.gh/handle/123456789/31380 | |
dc.language.iso | en | en_US |
dc.publisher | Geological Magazine | en_US |
dc.title | LA-ICP-MS U–Pb zircon, columbite-tantalite and 40Ar–39Ar muscovite age constraints for the rare-element pegmatite dykes in the Altai orogenic belt, NW China | en_US |
dc.type | Article | en_US |
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