A review on developments in the electrical structure of craton lithosphere

Hu, Xiangyun; Lin, Wule; Yang, Wayne; Yang, Bo

doi:10.1007/s11430-019-9653-2

Cited by 16 publications

(8 citation statements)

References 88 publications

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“…When the depth increases, a thick high-resistivity body R3 appears in the lower crust and upper mantle of the Shanxi Graben (Figure 7B), which is consistent with the previous MT study (Wei et al, 2008) and seismic studies (Bao et al, 2013;Jiang et al, 2013;Bao et al, 2015;Cai et al, 2021). We propose that the bottom of the high-resistivity body may be the LAB since it is considered to be a typical electrical structure of stable Archean cratons when the upper, middle to lower crust, lithospheric mantle, and the asthenosphere show high-low-high-low resistivity characteristics, respectively (Hu et al, 2020). Thus, we propose that the lithosphere of the central TNCO still retains most features of ancient cratons.…”

Section: The Crustal Conductor In the Tncosupporting

confidence: 89%

Spatial heterogeneity of the lithospheric destruction of the North China Craton: Evidence from an extended magnetotelluric sounding profile

Ye²,

Jin³

et al. 2023

Front. Earth Sci.

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To study the spatial heterogeneity of the North China Craton (NCC) destruction, this paper used a magnetotelluric sounding (MT) profile that passes through almost the entire NCC from west to east. Three-dimensional inversion is used to obtain a lithospheric resistivity model of the NCC. The results show that the upper crust of the Ordos Block is characterized by high resistivity. The lower crust to the upper mantle is characterized by low resistivity. The resistivity structure below the Trans-North China Orogen (TNCO) has stratification features; The Shanxi Graben shows high-low-high-low resistivity features from the upper crust to the asthenosphere; The lithosphere of the Lüliang and Taihang uplifts show high-resistivity features, and only some local relatively low-resistivity areas appear at the crust-mantle boundary. The upper crust on both sides of the Tan-Lu Fault Zone is characterized by high resistivity, but the resistivity structures of the lower crust and the lithospheric mantle are significantly different; The lower crust and the lithospheric mantle of the Sulu Orogenic Belt on the east are characterized by high resistivity; The Luxi Uplift on the west is represented by low resistivity. We propose that the mantle low-resistivity bodies (C1 and C4) of the Western and Eastern blocks may be related to the upwelling of partial melting materials along the ancient structurally weak zones in the lithosphere. The TNCO still has a typical Archean cratonic lithosphere, and the low-resistivity body C2 may be the remnant of the subducted oceanic crust. The Tan-Lu Fault Zone is structurally weak in the Eastern Block, while its western branch is a channel for the asthenospheric upwelling. We propose that the lithosphere of the northwestern Ordos Block and the Yinchuan-Hetao area is being destructed, and the TNCO is in the initial stage of being destructed. In contrast, the lithosphere of the Eastern Block has been severely destructed. In conclusion, affected by the subduction of the paleo-Pacific plate and the collision of the Indian and Eurasian plates, the ancient structures in the NCC were reactivated in the Mesozoic and Cenozoic, resulting in the spatial heterogeneity of the NCC destruction.

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Section: The Crustal Conductor In the Tncosupporting

confidence: 89%

Spatial heterogeneity of the lithospheric destruction of the North China Craton: Evidence from an extended magnetotelluric sounding profile

Ye²,

Jin³

et al. 2023

Front. Earth Sci.

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“…Even if CaCO 3 distributes homogeneously from the surface to the depths of ~150 km, the crystalline-amorphization transition or pressure-induced velocity reduction could guarantee a seismic velocity discontinuity at depths of 80-120 km. This also meet the constraints of global resetting of the age at these regions 21 and magnetolluric observations 19,20 .…”

Section: Introductionsupporting

confidence: 77%

“…CaCO 3 may work in the same way as hydrous minerals 4,16 . However, the high P-T electrical conductivity measurements of amphibole indicate the maximum fraction of hydrous minerals should be less than 1.5% to reconcile the magnetolluric observations 19,20 . Another consequence of the enrichment of hydrous minerals in the MLDs is the young-age rocks sandwiched by old rocks, while the global resetting of the age at these regions is not observed 21 .…”

Section: Introductionmentioning

confidence: 87%

Evidence for amorphous calcium carbonate originated mid-lithospheric discontinuities

Zhang

Hou²,

Hao

et al. 2023

Preprint

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Cratonic lithosphere is a vast host for deep recycled carbon, trapping up to several weight percent CO2 among its compositions1,2 at depths overlapping the seismic mid-lithospheric discontinuities (MLDs)3-5. However, the role of carbonates, especially for the latest discovered amorphous calcium carbonate (CaCO3)6, is underestimated in forming MLDs. Using the pulse-echo-overlap method in a Paris-Edinburgh press coupled with X-ray diffraction, we explored the acoustic velocities of CaCO3 under high pressure-temperature (P-T) conditions relevant to the cratonic lithosphere. Two anomalous velocity drops were observed associated with the phase transition from aragonite to amorphous phase as well as with pressure-induced velocity drop in amorphous phase around 3 GPa, respectively. Both drops are comparable with approximately 35% and 52% reductions for compressional (VP) and shear (VS) wave velocities, respectively. The VP and VS values of the amorphous CaCO3 above 3 GPa are about 1/2 and 1/3 of those of the major upper-mantle minerals, respectively, and they are the same with aragonite below 3 GPa. These velocity reduction by the presence of CaCO3 would readily cause MLDs at depths of 70–120 km dependent on the geotherm even if only 1-2 vol.% CaCO3 presents in the cratonic lithosphere. The CaCO3-originated MLDs is weak so as to be expected to influence the stability, rifting, and delamination of the craton7.

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“…Therefore, the magnetotelluric (MT) method is utilizedused to study structures beneath the Cuonadong dome in the Northern Himalayas, which is sensitive to fluids (saline fluids, partial melting, etc.) and is popularly used to explorestudy the resistivity structures of cratons and Tibetan Plateau where there a weak mid-to-lower crust is present (Unsworth et al, 2004(Unsworth et al, , 2005Wang et al, 2018;Ye et al, 2018;Jin et al, 2010;Xu et al, 2019;Chen et al, 2019;Hu et al, 2020;Yu et al, 2020;Xue et al, 2019Xue et al, , 2021. The Cuonadong dome is a newly discovered dome with rare-metal mineralization of beryllium (Be), polymetallic mineralization (lead-zinc (Pb-Zn), and gold-antimony (Au-Sb)), showing significant metallogenic potential Zhang et al, 2018;Xia et al, 2019;Liang et al, 2019Liang et al, , 2020.…”

Section: 穹窿构造与多金属成矿作用mentioning

confidence: 99%

北喜马拉雅错那洞穹窿深部三维电性结构及其构造意义

Xue¹,

Lu²,

Li³

et al. 2022

Sci. Sin.-Terrae

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A review on developments in the electrical structure of craton lithosphere

Cited by 16 publications

References 88 publications

Spatial heterogeneity of the lithospheric destruction of the North China Craton: Evidence from an extended magnetotelluric sounding profile

Spatial heterogeneity of the lithospheric destruction of the North China Craton: Evidence from an extended magnetotelluric sounding profile

Evidence for amorphous calcium carbonate originated mid-lithospheric discontinuities

北喜马拉雅错那洞穹窿深部三维电性结构及其构造意义

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