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The relationship between mafic-ultramafic rocks and suture zone in Hegenshan, Inner Mongolia evidence from geophysical data
Shao JiAn1; Zhang LiLi2; Zhou XinHua3,4; Zhang LvQiao5; Tang KeDong6
2020-05-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume63Issue:5Pages:1867-1877
AbstractThe mafic-ultramafic rocks in Erlian-Hegenshan of Inner Mongolia suture zone have been recognized as "ophiolite", "magmatic rock", "mantle-source melt-fluid" and other petrological terms by a variety of authors for last few decades. Diamond and other deep mantle-derived minerals have been identified in chromite in Hegenshan region in recent years, which raised the question of mafic-ultramafic rocks. This study presents the new geophysical observation data dealing with deep occurrence of the mafic-ultramafic rocks. The newly gained aeromagnetic data indicate that the ophiolite zone in Hegenshan area appears to be with high-value magnetic anomalies, whereas the Hegenshan block has shown, due to its burying depth much deeper than that of adjacent blocks, obviously higher magnetic and lower Bouguer gravity anomalies, which are in accordance with the mafic-ultramafic rocks exposing on the surface. The aeromagnetic and Bouguer gravity anomaly data are processed with upward continuation and estimation of the shape and bottom surface depth of the magnetic source. And the faults are identified with the assistance of the dissimilarity-based edge enhancement algorithm. The results show that the Hegenshan block is extended through the crust and trans-crust faults were developed nearby. From the surface to the middle crust, main components are serpentinization mafic-ultramafic rocks, and the lower crust mainly consists of ultramafic rocks. A group of NEE trending faults with a width of about 30 km was intruded by above mentioned rocks. Electrical resistivity structure of the crust and mantle revealed from magnetotelluric data further demonstrates that the suture zone was controlled tectonically by the lithospheric faults. It is inferred that the mantle melt-fluid continuously permeated along the lithospheric faults and finally reached the shallow surface of the crust under the background of regional upwelling of mantle diapir. It is suggested that the amalgamation of the plates is completed by intrusion of the deep mantle-derived materials.
KeywordSuture zone Mafic-ultramafic rock Aeromagnetic anomaly Gravity anomaly Upward continuation Mantle-source melt-fluid
DOI10.6038/cjg2020N0032
WOS KeywordOPHIOLITE
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000539702900012
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/96888
Collection油气资源研究院重点实验室
岩石圈演化国家重点实验室
Corresponding AuthorZhang LiLi
Affiliation1.Peking Univ, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Sch Earth & Space Sci, 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, Peoples R China
Corresponding Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Shao JiAn,Zhang LiLi,Zhou XinHua,et al. The relationship between mafic-ultramafic rocks and suture zone in Hegenshan, Inner Mongolia evidence from geophysical data[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(5):1867-1877.
APA Shao JiAn,Zhang LiLi,Zhou XinHua,Zhang LvQiao,&Tang KeDong.(2020).The relationship between mafic-ultramafic rocks and suture zone in Hegenshan, Inner Mongolia evidence from geophysical data.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(5),1867-1877.
MLA Shao JiAn,et al."The relationship between mafic-ultramafic rocks and suture zone in Hegenshan, Inner Mongolia evidence from geophysical data".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.5(2020):1867-1877.
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