Three-dimensional electrical resistivity structure beneath the Cuonadong dome in the Northern Himalayas revealed by magnetotelluric data and its implication

Magnetotelluric Imaging of the Central Himalayan Crust Away From Rift Zones

“…According to the horizontal slices (Figure 4), the Kudui and Gangba gneiss domes exhibited high resistivity from the shallow to deep crust, with conductor C2 at a depth of 20-40 km between the two domes. The electrically resistive property of the north Himalayan gneiss domes in the shallow crust is consistent with other MT results (Sheng et al, 2023;Wang et al, 2023;Xue et al, 2022). Below the conductive layer is the resistive body R2 (Figures 5a and 5b) and the top interface of resistor body R2 in the eastern profile was Geochemistry, Geophysics, Geosystems 10.1029/2023GC011132 approximately 40 km, which is 20 km deeper than the top interface of R2 in the western profile.…”

Crustal resistivity structure of the Lunpola basin in central Tibet and its tectonic implications

“…Besides, to the west of the MT profile AA', previous MT data of 9 sites with average ~10 km separation along the profile BB' (blue triangles in Fig. 1B) were supplementary to this study (Liang et al, 2018;Xue et al, 2022). dimensionality at most sites (Fig.…”

“…Compared to high electrical conductivities (~0.3 S/m) in mid-to-lower crust in the southern Tibet (Unsworth et al, 2005;Chen et al, 2018;Xue et al, 2021Xue et al, , 2022, the bulk conductivity (0.05 S/m) in mid-to-lower crust beneath the Lunpola baisn is clearly lower and analogous to the observed conductivities (~0.067 S/m) near the Karakorum strike-slip fault zone in the north-western Himalaya (Unsworth et al, 2005;Arora et al, 2007;Chen et al, 2018). The bulk conductivity of ~0.3 S/m requires a melt fraction of 5-14% which is sufficient to produce an order-of-magnitude reduction in viscosity, while the bulk conductivity of ~0.05-0.067 S/m requires a melt fraction of 1.3-4% that correspond to a more modest reduction in viscosity and a less-well-developed crustal flow (Unsworth et al, 2005).…”

A Review of Relationship between the Metallogenic System of Metallic Mineral Deposits and Lithospheric Electrical Structure: Insight from Magnetotelluric Imaging

“…The multi-scale electrical structure indicates a giant upper-mantle basaltic magma reservoir, indicated by the conductor DTHCZ beneath the Datong volcanic area, which moves through a lithosphere-scale shear zone, the mid-lower crustal magma chamber CZ3, the crust-scale weak zone, and a conduit (CC1 and CC2) to transport ore-forming magmas and fluids (Figure 7). Other typical results include the Ning (Nanjing)-Wu (Wuhu) basin in eastern China [90], the Shihu-Xishimen gold-iron ore district in North China [91], the Middle-lower Yangtze Metallogenic Belt (including Ningwu, Luzong, Xuancheng, Anqing, Guichi, and Tongling areas) in East China [12,[92][93][94][95][96], the Jiaodong gold deposits in northern China [97], the Liaodong Qingchengzi orefield [98], the Yixingzhai gold deposits (Boqiang Cu-Mo-Au deposits and Nanling W-Sn ore district in China) [45,99,100], the northeastern Jiangxi metallogenic province in southeastern China [101], the Caosiyao porphyry Mo ore district in North China [43], the Beiya Cu ore district in southwestern China [46], the large-scale Hatu epithermal gold deposit in western Junggar, NW China [102], Zhaxikang in the Tethys-Himalaya area in southwestern China [103,104], the Baogutu porphyry copper-gold deposit, the Hongqiling Cu-Ni sulfide intrusions in the Central Asian Orogenic Belt [105], the Xiangshan volcanogenic uranium deposit [106,107], the Narusongduo Pb-Zn-Fe-Cu ore district, and the Qulong-Jima porphyry ore Cu deposit in southwestern China [41,42]. In the Olympic Dam mine and Tennant ore district in Australia [108], the Tsagaan Tsahir Uul Au deposit in southern Mongolia [109], the Norrbotten district in northern Sweden [110,111], and the orogenic gold district in the Red Lake greenstone belt, western Superior craton, Canada [51], the electrical resistivity models obt...…”