External geodynamic evolution of the Mongolian Accretionary Collage: Insights from petro-chronology of zircon
文献类型：期刊论文
| 作者 | Broussolle, Arnaud1,4; Chen, Ming2; Long, Xiaoping3; Zhang, Le1,4 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2024 |
| 卷号 | 259页码:16 |
| 关键词 | Mongolian Accretionary Collage Accretionary wedge External ocean Hafnium -in -zircon Trace -element in zircon |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2023.105914 |
| 英文摘要 | Evolution of internal or external oceanic domains can bring decisive indications into the mode of formation of supercontinents, which is key to understand the supercontinent cycle. Defining the type of ocean evolving in the Central Asian Orogenic belt (CAOB) is thus critical to better understand the Earth's supercontinental evolution. In this contribution, we provide systematic and combined U-Pb, trace-element in zircon and hafnium-in-zircon analyses of four turbidites of the Altai accretionary wedge. These turbiditic rocks provide constraints into the early Paleozoic subduction-accretionary stages of the Mongolian Accretionary Collage (MAC) and show a major detrital age peak in the Cambro-Ordovician (similar to 490-500 Ma), with minor Neo- and Paleo-Proterozoic to Archean peaks. The zircon trace-elemental patterns are consistent with derivation mostly from magmatic arc (with granitoids affinity), interpreted as detritus sourced from the Ikh-Mongol continental arc system further north-east (present coordinates). The main detrital zircon peak together with the zircon magmatic arc origin suggest that the subduction-accretionary stage was active from 550 to 430 Ma showing mixed epsilon(Hf)(t) values (-20 to + 15). A summary of the detrital zircon epsilon(Hf)(t) values from 550 to 430 Ma suggests a continuous increase of epsilon(Hf)(t) mean values from + 0.2 to + 6.1 towards younger ages. The younging juvenile trend can be compared to the evolution of external orogeny, therefore consistent with a Pacific-type accretionary system facing an external ocean. At last, the results combined with two paleo-geographic reconstructions from the literature imply that the MAC may have been part of the Peri-Siberian accretionary orogeny in the early Paleozoic. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001163915100001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77403]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Broussolle, Arnaud |
| 作者单位 | 1.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 2.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China 3.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Broussolle, Arnaud,Chen, Ming,Long, Xiaoping,et al. External geodynamic evolution of the Mongolian Accretionary Collage: Insights from petro-chronology of zircon[J]. JOURNAL OF ASIAN EARTH SCIENCES,2024,259:16. |
| APA | Broussolle, Arnaud,Chen, Ming,Long, Xiaoping,&Zhang, Le.(2024).External geodynamic evolution of the Mongolian Accretionary Collage: Insights from petro-chronology of zircon.JOURNAL OF ASIAN EARTH SCIENCES,259,16. |
| MLA | Broussolle, Arnaud,et al."External geodynamic evolution of the Mongolian Accretionary Collage: Insights from petro-chronology of zircon".JOURNAL OF ASIAN EARTH SCIENCES 259(2024):16. |
入库方式： OAI收割
来源：广州地球化学研究所
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