Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B35404.1 |
Grenvillean evolution of the Beishan Orogen, NW China: Implications for development of an active Rodinian margin | |
Soldner, Jeremie1,2; Yuan, Chao1; Schulmann, Karel3,4; Stipska, Pavla3,4; Jiang, Yingde1; Zhang, Yunying5; Wang, Xinyu1 | |
2020-07-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:7-8页码:1657-1680 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; France; Czech Republic |
英文摘要 | New geochemical and geochronological data are used to characterize the geodynamic setting of metasediments, felsic orthogneisses, and eclogite and amphibolite lenses forming the Beishan complex, NW China, at the southern part of the Central Asian Orogenic Belt. The metasediments correspond compositionally to immature greywackes receiving detritus from a heterogeneous source involving a magmatic arc and a Precambrian continental crust. Metagranitoids, represented by felsic orthogneisses, show both composition of greywacke-derived granitic melt with incompatible trace element patterns similar to the host metasediments. The eclogite lenses are characterized by high Nb contents (5.34-27.3 ppm), high (Nb/La)(N) (>1), and low Zr/Nb ratios (<4.5), which together with variable and negative whole-rock epsilon(Nd) (t) (-4.3 to -10.3) and zircon epsilon(Hf) (t) (-5.0 to + 2.3) values indicate an origin of enriched mantle source as commonly manifested by back-arc basalts at stretched continental margins. Combined with monazite rare earth element analysis, the in situ monazite U-Pb dating of metagraywacke (880.7 +/- 7.9) suggests garnet growth during a high-temperature (HT) metamorphic event. Together with U-Pb dating of zircon metamorphic rims in amphibolite (910.9 +/- 3.0 Ma), this indicates that the whole crustal edifice underwent a Grenvillian-age metamorphic event. The protolith ages of the eclogite (889.3 +/- 4.8 Ma) and orthogneiss (867.5 +/- 1.9 Ma) suggest that basalt underplating and sediment melting were nearly coeval with this HT metamorphism. Altogether, the new data allow placing the Beishan Orogen into a Grenvillean geodynamic scenario where: (1) The late Mesoproterozoic to early Neoproterozoic was marked by deposition of the greywacke sequence coeval with formation of an early arc. (2) Subsequently, an asthenospheric upwelling generated basaltic magma underneath the thinned subcontinental mantle lithosphere that was responsible for HT metamorphism, melting of the backarc basin greywackes and intrusion of granitic magmas. These events correspond to a Peri-Rodinian supra-subduction system that differs substantially from the Neoproterozoic ophiolite sequences described in the Mongolian part of the Central Asian Orogenic Belt, thus indicating important lateral variability of supra-subduction processes along the Rodinian margin. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000545115400018 |
WOS关键词 | NEOPROTEROZOIC GRANITIC GNEISSES ; PRESSURE METAMORPHIC ROCKS ; SUBDUCTED OCEANIC-CRUST ; ELEMENT MOBILITY ; TECTONIC IMPLICATIONS ; ACCRETIONARY OROGENS ; GEOCHRONOLOGICAL CONSTRAINTS ; CONTINENTAL GROWTH ; WESTERN ALPS ; CENTRAL-ASIA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/289432 |
专题 | 地球科学 |
作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 10069, Peoples R China; 3.Univ Strasbourg, Inst Phys Globe Strasbourg, UMR 7516, CNRS,Sch & Observ Earth Sci, 1 Rue Blessig, F-67084 Strasbourg, France; 4.Czech Geol Survey, Ctr Lithospher Res, Klarov 3, Prague 11821 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 | Soldner, Jeremie,Yuan, Chao,Schulmann, Karel,et al. Grenvillean evolution of the Beishan Orogen, NW China: Implications for development of an active Rodinian margin[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(7-8):1657-1680. |
APA | Soldner, Jeremie.,Yuan, Chao.,Schulmann, Karel.,Stipska, Pavla.,Jiang, Yingde.,...&Wang, Xinyu.(2020).Grenvillean evolution of the Beishan Orogen, NW China: Implications for development of an active Rodinian margin.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(7-8),1657-1680. |
MLA | Soldner, Jeremie,et al."Grenvillean evolution of the Beishan Orogen, NW China: Implications for development of an active Rodinian margin".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.7-8(2020):1657-1680. |
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