气候变化领域集成服务门户(CCPortal): Crustal structure of the Indian plate underneath the alluvial plains of the central Ganga basin by broadband magnetotellurics

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DOI	10.1016/j.tecto.2021.228746
	Crustal structure of the Indian plate underneath the alluvial plains of the central Ganga basin by broadband magnetotellurics
	Adilakshmi L.; Manglik A.; Thiagarajan S.; Suresh M.
发表日期	2021
ISSN	00401951
卷号	802
英文摘要	The Ganga basin consists of thick Cenozoic sediments that mask the tectonic fabric of the underlying Indian plate. Despite the availability of fairly good information on the intra-basin structure, especially at the foothills of the Himalaya due to hydrocarbon exploration activities, very little is known about the basement and the crustal/lithospheric structure although composition and thermomechanical properties of the underthrusting Indian plate are expected to have a significant role in controlling the deformation and seismicity along the Himalayan arc. Here, we present a two-dimensional geoelectric model of the crustal structure along a 285-km-long profile across the central Ganga basin. The results were obtained by inversion of decomposed TE- and TM-mode impedance tensors derived from broadband magnetotelluric data recorded at 45 sites along the profile. The results reveal three main features: (i) the highly resistive Bundelkhand massif (BKC) extends northward beneath the sediments up to Lucknow; (ii) the massif is constituted of two blocks separated by a 10-km-wide moderately resistive nearly vertical zone; and (iii) a super-deep sedimentary basin constituted of highly conductive sedimentary succession exists in the northern segment of the profile. We report the presence of an electrical Moho at 40–45 km depth for the buried BKC and a crustal shear zone within the craton masked by the alluvial sediments. These results shall facilitate in furthering our understanding of the evolution of the BKC as well as the lithospheric/flexural deformation of the Indian continental lithosphere. © 2021
关键词	Crustal structure Electrical Moho Ganga basin Himalayan tectonics Magnetotellurics Shear zone
英文关键词	Deformation; Lithology; Magnetotellurics; Petroleum prospecting; Sedimentology; Sediments; Structural geology; Alluvial sediments; Broadband magnetotelluric; Cenozoic sediments; Continental lithosphere; Crustal structure; Geoelectric models; Hydrocarbon exploration; Thermomechanical properties; Plates (structural components); alluvial plain; crustal structure; data inversion; geoelectric field; Indian plate; magnetotelluric method; Moho; plate tectonics; shear zone; Ganges Basin
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/207926
作者单位	CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India
推荐引用方式 GB/T 7714	Adilakshmi L.,Manglik A.,Thiagarajan S.,et al. Crustal structure of the Indian plate underneath the alluvial plains of the central Ganga basin by broadband magnetotellurics[J],2021,802.
APA	Adilakshmi L.,Manglik A.,Thiagarajan S.,&Suresh M..(2021).Crustal structure of the Indian plate underneath the alluvial plains of the central Ganga basin by broadband magnetotellurics.Tectonophysics,802.
MLA	Adilakshmi L.,et al."Crustal structure of the Indian plate underneath the alluvial plains of the central Ganga basin by broadband magnetotellurics".Tectonophysics 802(2021).