Prospecting methods and deep geological setting of the Gabo pegmatite lithium deposit in the Himalayan metallogenic belt

doi:10.13745/j.esf.sf.2023.5.23

Abstract

Abstract:

Lithium, as an important strategic rare-metal resource, has been highly valued and plays an important role in aerospace, atomic energy and other fields. The Gabo lithium deposit is located in Luozha County, Tibet, adjacent to the Lalong dome in the north and the Kulagangri dome in the south. It is a newly discovered pegmatite lithium deposit in the Himalayan metallogenic belt. In the mining district, many gently-dipping spodumene-bearing pegmatite veins are developed along the detachment zone, in marble-intercalated schist strata of the detachment system, showing a close spatial relationship between lithium mineralization and the detachment zone and marble. In this paper, prospecting methods including high-density electric resistivity survey, radioactive survey and audio-frequency magnetotelluric sounding are investigated. The Gabo lithium pegmatite is characterized by high resistivity, low polarization and low gravity anomaly, without obvious radioactive anomaly. The spatial relationships between the Gabo pegmatite, the lower detachment fault, and granites in dome cores are determined by audio magnetotelluric and high-density resistivity surveys. Satellite gravity and magnetotelluric data show that the Gaibo lithium deposit is located near a north-south fault or rift valley, and its formation may be related to deep conductive layers and large-scale magma differentiation and crystallization. Its spatial structure and deep geological characteristics suggest that Gaibo is one of the potential areas for rare-metal mineralization in the Himalayas.

Key words: Himalayan metallogenic belt, Gabo, pegmatite lithium deposit, prospecting method, deep geological setting

CLC Number:

JIAO Yanjie, HUANG Xuri, LI Guangming, FU Jiangang, LIANG Shengxian, GUO Jing. Prospecting methods and deep geological setting of the Gabo pegmatite lithium deposit in the Himalayan metallogenic belt[J]. Earth Science Frontiers, 2023, 30(5): 255-264.

Figures/Tables 9

Fig.1 Location and geological and tectonic sketch map of eastern Himalayan

Fig.2 Simplified geological map of Lozha region, Tibet

Fig.3 Resistivity (a) and polarization (b) inversion models for line GGJ210

Fig.4 Variation of U elemental content along line GGJ210

Fig.5 Apparent resistivity and impedance phase curves for selected stations along the Gabo GA1 line

Fig.6 Phase tensor ellipses plotted for each station along the Gabo GA1 line

Fig.7 2D inversion model for the Gabo GA1 line

Fig.8 3D inversion model for Gabo GA1 line

Fig.9 Bouguer (a) and residual (b) gravity anomaly maps of eastern Himalayan based on satellite gravity data

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