The Late Paleozoic magmatic evolution of the Aqishan-Yamansu belt, Eastern Tianshan: Constraints from geochronology, geochemistry and Sr-Nd-Pb-Hf isotopes of igneous rocks | |
Liandang Zhao; Huayong Chen; Li Zhang; Weifeng Zhang; Juntao Yang; Xuelu Yan | |
2018 | |
Source Publication | Journal of Asian Earth Sciences
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Volume | 153Pages:170-192 |
Abstract | The Aqishan-Yamansu belt in the Eastern Tianshan (Xinjiang, NW China) is an important mineralization belt. The belt mainly comprises Carboniferous volcanic, volcaniclastic and clastic rocks, and hosts many intermediate–felsic intrusions and Fe (–Cu) deposits. The biotite diorite, felsic brecciated tuff, granodiorite and syenite from the western Aqishan-Yamansu belt are newly zircon U–Pb dated to be 316.7 ± 1.4 Ma, 315.6 ± 2.6 Ma, 305.8 ± 1.9 Ma and 252.5 ± 1.4 Ma, respectively. The mafic rocks (mafic brecciated tuff and diabase porphyry) are tholeiitic to calc-alkaline series, LILE-rich (e.g., Rb, Ba and Pb), HFSE-depleted (e.g., Nb and Ta), and have high Mg#(44–60), Nb/Ta (15.0–20.0), Ba/La (> 30) and Ba/Nb (> 57) values/ratios, and low Th/Yb ratios (< 1), probably originating from mantle wedge metasomatized by slab-derived fluids. The intermediate–felsic igneous rocks are LILE-rich, HFSE-depleted, with high Sr and Y contents showing typical of normal arc magma affinity. Moreover, the depleted εHf(t) (> 2.10) and positive εNd(t) (> 5.7), combined with variable Nb/Ta ratios (9.52–21.4), Y/Nb ratios (1.47–39.7) and Pb isotopes (206Pb/204Pb = 16.225–17.640, 207Pb/204Pb = 15.454–15.520, 208Pb/204Pb = 37.097–38.025) suggest that these rocks were magma mixing products between juvenile crustal-derived magmas and minor mantle-derived magmas. Combined published works with our new ages, geochemical and isotopic data, we propose that the Aqishan-Yamansu belt was an Early Carboniferous fore-arc basin during the southward subduction of the Kangguer oceanic slab beneath the Yili-Central Tianshan block. With the continuing southward subduction, the Aqishan-Yamansu fore-arc basin initiated to close, which generated the mafic and intensive intermediate–felsic magmatism associated with regional Fe (–Cu) mineralization. |
Keyword | Aqishan-yamansu Belt magmatic Evolution zircon U–pb Dating sr–nd–pb–hf Isotopes eastern Tianshan |
Indexed By | SCI |
Language | 英语 |
Document Type | 期刊论文 |
Identifier | http://ir.gyig.ac.cn/handle/42920512-1/8671 |
Collection | 矿床地球化学国家重点实验室 |
Affiliation | 1.Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.Guangdong Provincial Key Laboratory of Mineral Physics and Materials, 511 Kehua Street, Guangzhou 510640, China 4.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 5.Wuhan Institute of Geology and Mineral Resources, China Geological Survey, 434205, China 6.No. 1 Geological Party of Xinjiang Bureau of Geology and Mineral Exploration, Changji 831100, China |
Recommended Citation GB/T 7714 | Liandang Zhao,Huayong Chen,Li Zhang,et al. The Late Paleozoic magmatic evolution of the Aqishan-Yamansu belt, Eastern Tianshan: Constraints from geochronology, geochemistry and Sr-Nd-Pb-Hf isotopes of igneous rocks[J]. Journal of Asian Earth Sciences,2018,153:170-192. |
APA | Liandang Zhao,Huayong Chen,Li Zhang,Weifeng Zhang,Juntao Yang,&Xuelu Yan.(2018).The Late Paleozoic magmatic evolution of the Aqishan-Yamansu belt, Eastern Tianshan: Constraints from geochronology, geochemistry and Sr-Nd-Pb-Hf isotopes of igneous rocks.Journal of Asian Earth Sciences,153,170-192. |
MLA | Liandang Zhao,et al."The Late Paleozoic magmatic evolution of the Aqishan-Yamansu belt, Eastern Tianshan: Constraints from geochronology, geochemistry and Sr-Nd-Pb-Hf isotopes of igneous rocks".Journal of Asian Earth Sciences 153(2018):170-192. |
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