Devonian subduction retreat recorded in the Chinese Altai Orogen: Petro-structural and geochronological constraints from orogenic lower crust migmatite-granite complexes
文献类型：期刊论文
| 作者 | Kong, Ling-Zhu1,2,3; Jiang, Ying-De1,2; Li, Peng-Fei1,2; Collett, Stephen4; Xiao, Ming1,2,5 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2023-04-01 |
| 卷号 | 244页码:20 |
| 关键词 | Migmatite-granite complex S ub-horizontal crustal flow Low-pressure high-temperature metamorphism Chinese Altai Orogen Subduction retreat |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2023.105540 |
| 英文摘要 | Crustal extension due to the retreat of subduction system has been assigned as an important mechanism gov-erning the Devonian tectonic evolution of the Chinese Altai Orogen in central Asia. While the extensional regime has been repeatedly inferred from petro-structural (petrographic and structural) records preserved in the orogenic upper crust sedimentary covers and orogenic middle crust schists, such records have rarely been documented in the deep crustal migmatitic and/or magmatic rocks. This gap is filled in this study by applying combined petro-structural analysis in conjunction with zircon and monazite U-Pb geochronology on represen-tative orogenic lower crustal migmatite-granite complexes. These complexes are characterized by the develop-ment of a sub-horizontal foliation associated with extensional melt-filled shear bands. The foliation commonly contains garnet-sillimanite +/- K-feldspar +/- cordierite-bearing metamorphic assemblages that are compatible with a low-pressure/high-temperature thermal regime. In addition, such mineral assemblages are usually found to replace pre-existing middle-pressure/middle-temperature Barrovian-type ones, reflecting a tectonic switch from thickening to extension. New monazite and zircon U-Pb age data, together with regional pre-existing ages, suggest that the sub-horizontal high-temperature foliation formed during a period of 420-390 Ma. Combined with previously published data, our data reinforce that a crustal-scale extensional tectonic regime developed in response to retreating of subduction system governed the geodynamic evolution of the Chinese Altai Orogen during Devonian times. This process led to regional anatexis of the pre-existing Ordovician accretionary wedge complex, facilitated the formation of stabilized and vertically stratified continental crust, and promoted the metallogenic evolution in the region during the Devonian. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000993772800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/74249]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Jiang, Ying-De |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Beijing 10049, Peoples R China 4.Czech Geol Survey, Ctr Lithospher Res, Prague 1, Czech Republic 5.Univ Hong Kong, Dept Earth Sci, Pokfulam Rd, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Kong, Ling-Zhu,Jiang, Ying-De,Li, Peng-Fei,et al. Devonian subduction retreat recorded in the Chinese Altai Orogen: Petro-structural and geochronological constraints from orogenic lower crust migmatite-granite complexes[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,244:20. |
| APA | Kong, Ling-Zhu,Jiang, Ying-De,Li, Peng-Fei,Collett, Stephen,&Xiao, Ming.(2023).Devonian subduction retreat recorded in the Chinese Altai Orogen: Petro-structural and geochronological constraints from orogenic lower crust migmatite-granite complexes.JOURNAL OF ASIAN EARTH SCIENCES,244,20. |
| MLA | Kong, Ling-Zhu,et al."Devonian subduction retreat recorded in the Chinese Altai Orogen: Petro-structural and geochronological constraints from orogenic lower crust migmatite-granite complexes".JOURNAL OF ASIAN EARTH SCIENCES 244(2023):20. |
入库方式： OAI收割
来源：广州地球化学研究所
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