气候变化领域集成服务门户(CCPortal): 2-D versus 3-D Magnetotelluric Data Interpretation: A case study from the Dharwar craton, India

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DOI	10.1016/j.tecto.2021.229028
	2-D versus 3-D Magnetotelluric Data Interpretation: A case study from the Dharwar craton, India
	Kusham; Naick B.P.; Pratap A.; Naganjaneyulu K.
发表日期	2021
ISSN	00401951
卷号	816
英文摘要	The resistivity structure of the lithosphere in the Dharwar craton is imaged using 17 magnetotelluric stations along a ~280 km long profile with an inter-station spacing of ~15 km. Since the adjacent two profiles have shown 2-D nature, initially 2-D inversion is carried out. But the resulting structures are completely different. WALDIM dimensionality analysis shows the 3-D nature of the subsurface structures for most of the frequencies beneath the given profile. 3-D inversion was done by using the WSINV3DMT inversion code. 3-D modelling results imaged several conductors in the crust and uppermost mantle region. The lithosphere can be divided into shallow and deeper lithospheres based on the conductivity anomalies present in the model. In the crustal region, vertical conductive features (~10 Ω-m) are present in the western and central part of the profile. A new finding of this 3-D study is the presence of an uppermost mantle conductor at the depth range of 100–200 km. The electrical properties of the conductors are comparable with the northward situated adjacent profiles conductors. The conductors present in the crust are due to sulphides and carbon-rich fluids. The low electrical resistivity in the deeper lithosphere is due to the refertilization of the mantle scar in the Cretaceous age by the passage of several hotspots. The conductor could be interpreted in the terms of the melt present in the region. In general, 2-D interpretation of 3-D magnetotelluric data acts as a guide to geological interpretation, but not in this case of the Dharwar craton. The concluding remark is that the 3-D image of the single profile data gives a better understanding of the subsurface structures as compared to 2-D inversion results. © 2021 Elsevier B.V.
关键词	2-D Versus 3-D 3-D inversion Conductivity Dharwar craton Dimensionality Magnetotellurics
英文关键词	Magnetotellurics; Sulfur compounds; Telluric prospecting; Conductivity anomalies; Dimensionality analysis; Geological interpretation; Magneto-telluric stations; Magnetotelluric data; Resistivity structure; Subsurface structures; Uppermost mantle; Structural geology; data interpretation; data inversion; data set; magnetotelluric method; mantle source; three-dimensional modeling; two-dimensional modeling; Dharwar Craton; India
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207999
作者单位	Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India; Electromagnetic Geophysics, CSIR-National Geophysical Research Institute, Hyderabad, 500007, India; Oil India Limited, Bhubaneswar, Odisha 751007, India
推荐引用方式 GB/T 7714	Kusham,Naick B.P.,Pratap A.,et al. 2-D versus 3-D Magnetotelluric Data Interpretation: A case study from the Dharwar craton, India[J],2021,816.
APA	Kusham,Naick B.P.,Pratap A.,&Naganjaneyulu K..(2021).2-D versus 3-D Magnetotelluric Data Interpretation: A case study from the Dharwar craton, India.Tectonophysics,816.
MLA	Kusham,et al."2-D versus 3-D Magnetotelluric Data Interpretation: A case study from the Dharwar craton, India".Tectonophysics 816(2021).