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Conference Paper

Mineralization of the Bayankhongor Metal Belt and the South Hangai suture zone, Mongolia: insights from 3-D electrical resistivity models

Authors

Comeau,  M.J.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Käufl,  J.S.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Becken,  M.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Kuvshinov,  A.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Grayver,  A.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Kamm,  J.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Demberel,  S.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Batmagnai,  E.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Tserendug,  S.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Eldev-Ochir,  E.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

Nasan-Ochir,  T.
28. Kolloquium, 2019, Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung, External Organizations;

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EMTF_2019_HalternAmSee_05_Comeau.pdf
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Citation

Comeau, M., Käufl, J., Becken, M., Kuvshinov, A., Grayver, A., Kamm, J., Demberel, S., Batmagnai, E., Tserendug, S., Eldev-Ochir, E., Nasan-Ochir, T. (2020): Mineralization of the Bayankhongor Metal Belt and the South Hangai suture zone, Mongolia: insights from 3-D electrical resistivity models. - In: Börner, J., Yogeshwar, P., Becken, M. (Eds.), - Protokoll über das 28. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung: Haltern am See, 23.-27. September 2019, 28. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung (Haltern am See 2019), 30-37.


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5001455
Abstract
The South Hangai fault system, located between the uplifted Hangai Dome and the Gobi-Altai Mountains in central Mongolia, represents an ancient suture zone and terrane boundary, which is possibly an extension of the Mongol–Okhotsk suture that resulted from the closure of the Mongol–Okhotsk Ocean. The adjacent obducted Bayankhongor Ophiolite Belt is possibly the longest continuous ophiolite belt in the world. This area is important because it is associated with the Bayankhongor Metal Belt, which is an economically significant zone for ore extraction in Mongolia, including important sources of gold and copper. Electrical resistivity is a key parameter for mineral exploration. Because faults and suture zones are regions of fractured, weakened crust they often have circulating fluids that act to increase their electrical conductivity. Additionally, economic mineralization is commonly associated with a conductive signature from associated sulfide minerology. We present magnetotelluric data acquired in an array across the southern Hangai region, Valley of Lakes, Mongolia. The magnetotelluric data were used to generate 3-D electrical resistivity models of the shallow crustal structure. Because the cratonic upper crust is highly resistive (> 1000 Ωm), the low- resistivity (< 30 Ωm) South Hangai fault system is easily detected. It is revealed to be a major crustal-scale structure. A clear transition in crustal electrical properties was observed across the suture zone and may reflect both the rheological and petrological differences across accreted terranes. Furthermore, anomalous, low-resistivity zones in the crust are spatially associated with the surface expressions of known mineralization and resource extraction projects. By combining our electrical resistivity results with other geological and petrological data we attempt to gain insights into the potential mineral resources of this unique region, and their origin.