| Geochemistry and petrogenetic implications of a Late Devonian mafic-ultramafic intrusion at the southern margin of the Central Asian Orogenic Belt | |
Wei Xie; Xie-Yan Song ; Yu-Feng Deng; Yu-Shan Wang; Duo-Heng Ba; Wen-Qin Zheng; Xiao-Biao Li
| |
| Corresponding Author | Xie-Yan Song |
| 2012 | |
| Source Publication | Lithos
 |
| Volume | 144-145Issue:2Pages:209–230 |
| Abstract | The Heishan mafic-ultramafic intrusion was emplaced into Neoproterozoic metamorphic strata in the eastern Beishan Fold Belt at the southern margin of the Central Asian Orogenic Belt. The dominant rocks of the intrusion are harzburgite and Iherzolite. Olivine gabbro-norite and gabbro dyke occur only along the southern margins of the intrusion. The rocks of the Heishan intrusion are characterized by enrichments of large ion lithophile elements, strong negative Nb (Ta) anomalies and positive K and Pb anomalies. These features are perfectly consistent with those of the Devonian volcanics in the Beishan Fold Belt and indicate subduction-related magmatism. The Heishan intrusive rocks have restricted epsilon(Nd(t)) (+ 0.34 to + 3.95) and a large range of (Sr-87/Sr-86)(t) ratios (0.7041 to 0.7087). Their high (Pb-207/Pb-204)(t) (15.55-15.64) and (Pb-208/Pb-204)(t) (37.71-38.29) values are comparable with those of the volcanics along the Pacific margins of the Americas. Zircon ID-TIMS U-Pb age data (356.4 +/- 0.6 Ma and 366.6 +/- 0.6 Ma) and SHRIMP U-Pb age data (358 +/- 5 Ma and 357 +/- 4 Ma) indicate that the intrusion was emplaced in the Late Devonian. Our calculations indicate that the parental magma of the Heishan intrusion had a high-Mg basaltic composition with similar to 11.3 wt.% MgO and similar to 10.0 wt.% FeOT. It is proposed that the high-Mg basaltic magma was generated from partial melting of the asthenosphere and mantle wedge triggered by upwelling of asthenosphere due to slab break-off in an active continental margin. |
| Keyword | Southern Margin Of Central Asia Orogenic Belt Heishan Intrusion Late Devonian Active Continental Margin Break-Off Of Subduction Slab |
| Subject Area | 矿床地球化学 |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/4820 |
| Collection | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 |
| Corresponding Author | Xie-Yan Song |
| Recommended Citation GB/T 7714 | Wei Xie,Xie-Yan Song,Yu-Feng Deng,et al. Geochemistry and petrogenetic implications of a Late Devonian mafic-ultramafic intrusion at the southern margin of the Central Asian Orogenic Belt[J]. Lithos,2012,144-145(2):209–230. |
| APA | Wei Xie.,Xie-Yan Song.,Yu-Feng Deng.,Yu-Shan Wang.,Duo-Heng Ba.,...&Xiao-Biao Li.(2012).Geochemistry and petrogenetic implications of a Late Devonian mafic-ultramafic intrusion at the southern margin of the Central Asian Orogenic Belt.Lithos,144-145(2),209–230. |
| MLA | Wei Xie,et al."Geochemistry and petrogenetic implications of a Late Devonian mafic-ultramafic intrusion at the southern margin of the Central Asian Orogenic Belt".Lithos 144-145.2(2012):209–230. |
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