Abstract
ABSTRACT The geological map L-47-V at a scale 1:500,000 covers part of Mongolian Altaids with ophiolite fragments in southern Central Asian Orogenic Belt in SW Mongolia. This region has a basin and range topography with Neoproterozoic and Palaeozoic units exposed at NW–SE trending ranges rising along major intracontinental faults and with intermontane basins filled by Mesozoic and Cenozoic sediments in between. The map shows clear N–S tectonic zonation featuring the northerly Precambrian Baidrag microcontinent, the lower Palaeozoic Lake Zone in the centre and the southerly Palaeozoic Gobi-Altai and Trans-Altai zones. Gravity highs are located in the SW part of the map and low to intermediate Bouguer anomalies in the NE part. NW–SE trends of gravity anomalies correlate well with the contact between the Trans-Altai and the Gobi-Altai zones but the important first-order geological boundary between the Lake and Gobi-Altai zones cannot be delineated by the gravity gradients.
Highlights
Geological map is a scaled-down interpretation of the structure of a selected area of the uppermost part of the Earth’s crust
Covering c. 53 000 km2 in the Bayankhongor and Gobi Altai provinces of SW Mongolia. In this critical region of the Mongolian Altaids, the Neoproterozoic to upper Palaeozoic geological units are exposed in NW– SE trending mountain ranges, while Mesozoic and Cenozoic sediments fill basins among them
The map shows clear NE–SW tectonic zonation (Figure 2) in pre-Permian sequences ranging from the northerly Baidrag Block (Precambrian continent fragment), through the Lake Zone (Neoproterozoic – lower Palaeozoic accretionary wedge with ophiolite remnants) to the southerly Gobi-Altai Zone and the Trans-Altai Zone
Summary
Geological map is a scaled-down interpretation of the structure of a selected area of the uppermost part of the Earth’s crust. Exploration of natural resources and identification of geological hazards are the most important functions of the geological maps They represent an indispensable tool allowing the reconstruction of the geological history of the Earth, and provide a solution for theoretical and applied problems allowing further advances in the Earth Sciences. 53 000 km in the Bayankhongor and Gobi Altai provinces of SW Mongolia In this critical region of the Mongolian Altaids, the Neoproterozoic to upper Palaeozoic geological units are exposed in NW– SE trending mountain ranges, while Mesozoic and Cenozoic sediments fill basins among them. This map sheet demonstrates the efficiency of using satellite imagery and geophysics together with field, current geochronological and geochemical data to produce reliable geological maps in remote regions with a high ore-deposit potential
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