Construction of an island arc and back-arc basin system in eastern Central Asian Orogenic belt: Insights from contrasting Late Carboniferous intermediate intrusions in Central Inner Mongolia, North China
文献类型：期刊论文
| 作者 | Yang, Zhili1,3,4; Zhang, Xiaohui1,3; Yuan, Lingling2 |
| 刊名 | LITHOS
 |
| 出版日期 | 2020-11-01 |
| 卷号 | 372页码:16 |
| 关键词 | Late Carboniferous Intermediate intrusions Geochemistry Back arc basin North China |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2020.105672 |
| 英文摘要 | Characterizing island arc and back arc basin system through detailed magmatic profile remains a pivotal task in any regional paleotectonic and supercontinental reconstructions along ancient convergent plate margins, as is of paramount importance for the northern China-southern Mongolia (NCSM) tract along the eastern Central Asian Orogenic belt (CAOB). Here we document episodic Late Carboniferous intermediate to felsic intrusive suites in the West Ujimqin region of central Inner Mongolia, spanning from ca. 315 Ma granodiorites through ca. 310 Ma hornblende diorites to ca. 305-301 Ma diorites. The earlier granodiorites exhibit dominant magnesian-tholeiitic affinity, enrichment in large ion lithophile elements (LILEs) and depletion in high field strength elements (HFSEs), and possess whole-rock I-Sr(t) ratios of 0.707387-0.708799, negative epsilon(Nd)(t) of -23 to -2.4 and zircon epsilon(Hf)(t) values of -0.69 to +4.87 and delta O-18 of +633 to +8.40 parts per thousand. These features are consistent with the magmatic derivation from dehydration melting of tholeiitic mafic to intermediate lower crustal underplates with obvious high delta O-18 supracrustal inputs. The ca. 310 Ma pod-like homblende diorites display high-Ca boninite-like elemental traits and MORB-like isotopic compositions (I-Sr(t) = 0.704190 to 0.704203, epsilon(Nd) (t) = +7.9 to +8.3, zircon epsilon(Hf)(t) = +14.7 to +17.5 and delta O-18 = +4.88 to +6.16 parts per thousand), indicative of a prior melt-depleted then fluid-enriched mantle source. By contrast, subsequent (301-305 Ma) diorites show arc-like elemental hallmarks, with notable enriched Lll.Es and depleted HFSEs as well as variable isotopic values (I-Sr(t) = 0.703690-0.704065, epsilon(Nd)(t) = +3.5 to +8.4. zircon epsilon(Hf)(t) = +7.10 to +16.4 and delta O-18 = +3.75 to +6.83 parts per thousand). They are interpreted to represent the evolved products of homblende-dominated fractional crystallization from depleted basaltic parental magmas. Given their coincidence with regional backarc-basin type ophiolitic stratigraphy and detrital zircon age spectra, these intermediate to felsic intrusive suites tend to document the timeline of a back arc basin formation from initial rifting to maturation. In conjunction with Early Carboniferous forearc-type ophiolitic complexes and forearc magmatic records at West Ujimqin and the adjacent region, a Carboniferous island arc and back arc system can be reconstructed from Xilinhot to West Ujimqin. The characterization of this northward (present day coordinates) subduction system in terms of its temporal evolution not only provides overwhelming evidence that modern Pacific-like, archipelago-type arc configuration had prevailed in central Inner Mongolia during the Carboniferous, but also offers vivid insights into the diversity of crustal generation mechanism in a subduction factory that ushered in seminal continental crustal construction in the eastern CAOB. (C) 2020 Elsevier B.V. All rights reserved. |
| WOS关键词 | WORKING REFERENCE ; VOLCANIC-ROCKS ; CRUSTAL GROWTH ; PETROGENESIS ; OPHIOLITE ; EVOLUTION ; ZIRCON ; ACCRETION ; GEOCHEMISTRY ; MAGMATISM |
| 资助项目 | theNational Key R&D Program of China[2017YFC0601306] ; National Natural Science Foundation of China[41873035] ; National Natural Science Foundation of China[41573031] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000571822700012 |
| 出版者 | ELSEVIER |
| 资助机构 | theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; theNational Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/98261]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Zhang, Xiaohui |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China 2.Cent South Univ, Sch Geosci & Infophys, Key Lab Metallogen Predict Nonferrous Met & Geol, Minist Educ, Changsha 410083, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Zhili,Zhang, Xiaohui,Yuan, Lingling. Construction of an island arc and back-arc basin system in eastern Central Asian Orogenic belt: Insights from contrasting Late Carboniferous intermediate intrusions in Central Inner Mongolia, North China[J]. LITHOS,2020,372:16. |
| APA | Yang, Zhili,Zhang, Xiaohui,&Yuan, Lingling.(2020).Construction of an island arc and back-arc basin system in eastern Central Asian Orogenic belt: Insights from contrasting Late Carboniferous intermediate intrusions in Central Inner Mongolia, North China.LITHOS,372,16. |
| MLA | Yang, Zhili,et al."Construction of an island arc and back-arc basin system in eastern Central Asian Orogenic belt: Insights from contrasting Late Carboniferous intermediate intrusions in Central Inner Mongolia, North China".LITHOS 372(2020):16. |
入库方式： OAI收割
来源：地质与地球物理研究所
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