Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of Altai–East Junggar convergence
文献类型：期刊论文
| 作者 | Shu, Tan; Jiang, Yingde ; Schulmann, Karel; Yu, Yang; Yuan, Chao; Wang, Sheng; Li, Zhiyong; Kong, Lingzhu
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| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2023 |
| 卷号 | 135期号:5-6页码:1243-1264 |
| 关键词 | ASIAN OROGENIC BELT PALEOZOIC TECTONIC EVOLUTION A-TYPE GRANITES U-TH-PB NW CHINA FRACTIONATED GRANITES ACCRETIONARY WEDGE NORTHWESTERN CHINA CONTINENTAL-CRUST TETHYAN HIMALAYA |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36408 |
| 英文摘要 | How and at which thermal conditions the convergence between the Chinese Altai and East Junggar operated remain poorly understood. This issue is addressed in the current study by focusing on the timing and petrogenesis of syntectonic granite dykes from the representative areas of Fuyun (con-vergent front) and Kalasu-Aletai (Chinese Altai interior). It is shown that Fuyun and Kalasu-Aletai dykes are fractionated I-and S-type granites, with zircon and monazite U-Pb ages of 300-291 Ma and 281-265 Ma, respectively. Geochemically, the Fuyun dykes have lower contents of aluminous (ASI: 0.97- 1.13) and light rare earth element-enriched features, while the Kalasu-Aletai dykes have ASI = 1.01-2.17 and show overall flat rare earth element patterns with tetrad effects. The Fuyun dykes exhibit less evolved Sr-Nd isotopic characteristics (87Sr/86Srinitial: 0.7039-0.7048, epsilon Nd(t): +5.7 to +6.1) with respect to those of the Kalasu-Aletai dykes (87Sr/86Srinitial: 0.6978-0.7183, epsilon Nd(t): -7.6 to +3.0). The Fuyun and Kalasu-Aletai dykes are geochemically compatible with isotopi-cally less evolved East Junggar arc compo-nents and heterogeneous Ordovician wedge sediment of the Chinese Altai, respectively, implying genetic links. We propose that the late Paleozoic Chinese Altai-Junggar con-vergence created a local perturbation of weak mantle beneath the southern Chinese Altai, causing partial melting of the under -thrusting East Junggar and the overriding Altai components successively. The resulting magmas were emplaced along northward propagating syn-tectonic tensional fractures perpendicular to the Chinese Altai-East Junggar deformation front that serves as an excellent indicator of the convergent -short-ening process. tectonic zoic cene acteristics decompression 2011). |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000983496700003 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80378]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Shu, Tan,Jiang, Yingde,Schulmann, Karel,et al. Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of Altai–East Junggar convergence[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2023,135(5-6):1243-1264. |
| APA | Shu, Tan.,Jiang, Yingde.,Schulmann, Karel.,Yu, Yang.,Yuan, Chao.,...&Kong, Lingzhu.(2023).Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of Altai–East Junggar convergence.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(5-6),1243-1264. |
| MLA | Shu, Tan,et al."Structure, geochronology, and petrogenesis of Permian peraluminous granite dykes in the southern Chinese Altai as indicators of Altai–East Junggar convergence".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.5-6(2023):1243-1264. |
入库方式： OAI收割
来源：广州地球化学研究所
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