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A further study on the ophiolite in Hegenshan, Inner Mongolia.
Hao JiAn1; Zhang LiLi2; Zhou XinHua3,4; Zhang LvQiao5; Tang KeDong6
AbstractThe previously termed as "Hegenshan ophiolite suite", a composite rock suite, in the suture zone between North China block (plate) and Central Asian-Mongolia continental block has been divided into three rock series with different constituents and different genesis by this study: (1) mafic-ultramafic rocks, mainly composed of meta-peridotite series with diamonds and other mantle derived minerals, also including cumulate complex; (2) a basalt series intercalated with radiolarian siliceous rocks; and (3) an overlying volcanic-sedimentary rock series. Based on the evidences from geology and geochronology, the Hegenshan ophiolite can be considered as formed in Late Devonian-Early Carboniferous. On this basis, three issues have been focused by this article: (1) combined with structural geology studies in different scales, the mafic-ultramafic rocks containing diamonds and other mantle-derived minerals can be regarded as tectonic emplacement rocks, derived from deep melt-fluids, which continuously rising up from mantle transitional zone as the asthenosphere upwelling diapirs during the plate converge process. Hereby, the traditional concept of ophiolite has been extended, and it is postulated that two plates converged by amalgamate process to unify, instead of obvious subduction or collision in Hegenshan region; (2) comparison of the Hegenshan OIB-type basalts with the Chaogenshan MORB-type basalts indicates that the existence of multiple massifs derived from different sources and the time difference between plates closure is one of the characteristics of the small intercontinental ocean basins; (3) the volcanic-sedimentary rocks overlying on basalt series has been regarded as the final stage products of filling-in the ocean basin, which demonstrates the direct transform process from oceanic crust to continental crust in small-medium intercontinental ocean basins during closure of the paleo-Asian ocean. Finally, the temporal and spatial characteristics of closure of small oceanic basin are discussed.
KeywordSutural zone Mafic-ultramafic rock Basalt Overlying rock series Small oceanic basin closure Hegenshan
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491164900016
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Document Type期刊论文
Corresponding AuthorHao JiAn
Affiliation1.Sch Earth & Space Sci, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, 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, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
5.Geol Bur Inner Mongolia, Hohhot 010020, Peoples R China
6.Shenyang Inst Geol & Mineral Resource, Shenyang 110034, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Hao JiAn,Zhang LiLi,Zhou XinHua,et al. A further study on the ophiolite in Hegenshan, Inner Mongolia.[J]. ACTA PETROLOGICA SINICA,2019,35(9):2864-2872.
APA Hao JiAn,Zhang LiLi,Zhou XinHua,Zhang LvQiao,&Tang KeDong.(2019).A further study on the ophiolite in Hegenshan, Inner Mongolia..ACTA PETROLOGICA SINICA,35(9),2864-2872.
MLA Hao JiAn,et al."A further study on the ophiolite in Hegenshan, Inner Mongolia.".ACTA PETROLOGICA SINICA 35.9(2019):2864-2872.
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