https://www.mongoliajol.info/index.php/MGS/issue/feed Mongolian Geoscientist 2020-12-22T11:25:05+00:00 Batkhishig Bayaraa mongoliangeoscientist@must.edu.mn Open Journal Systems <p>The Mongolian Geoscientist is published by the <a title="MUST" href="http://www.must.edu.mn/" target="_blank" rel="noopener">Mongolian University of Science and Technology </a>with support from&nbsp;<a title="Mongolian Geological Society" href="http://geosociety.mn" target="_blank" rel="noopener">The Geological Society of Mongolia</a>.</p> <p><strong>The Mongolian Geoscientist is included on <a title="Google Scholar" href="https://scholar.google.com" target="_blank" rel="noopener">Google Scholar</a>, <a title="Dimensions" href="https://app.dimensions.ai/discover/publication?and_facet_source_title=jour.1364668" target="_blank" rel="noopener">Dimensions,</a>&nbsp;<a title="DOAJ" href="https://www.doaj.org/toc/2663-5151" target="_blank" rel="noopener">DOAJ</a> and <a title="CNKI" href="https://enscholar.cnki.net/journal/search" target="_blank" rel="noopener">CNKI</a></strong></p> https://www.mongoliajol.info/index.php/MGS/article/view/1456 Preface - v.51 2020-12-22T11:25:00+00:00 Batkhishig Bayaraa mongoliangeoscientist@must.edu.mn <p>No abstract in English</p> 2020-12-21T05:52:02+00:00 ##submission.copyrightStatement## https://www.mongoliajol.info/index.php/MGS/article/view/1457 Lower Permian basaltic agglomerate from the Tsengel River valley, Mongolian Altai 2020-12-22T11:25:01+00:00 Kristýna Hrdličková kristyna.hrdlickova@geology.cz Altanbaatar Battushig kristyna.hrdlickova@geology.cz Pavel Hanžl kristyna.hrdlickova@geology.cz Alice Zavřelová kristyna.hrdlickova@geology.cz Jitka Míková kristyna.hrdlickova@geology.cz <p>A new occurrence of Permian volcanic and volcaniclastic rocks in the Mongolian Altai south of the Main Mongolian Lineament was described between soums of Tugrug and Tseel in Gobi-Altai aimag. Studied vitrophyric pyroxene basalt lies in a layer of agglomerate and amygdaloidal lavas, which is a part of NE–SW trending subvertical sequence of varicolored siltstones and volcaniclastic rocks in the Tsengel River valley. This high-Mg basalt is enriched in large ion lithophile elements, Pb and Sr and depleted in Nb and Ta. LA-ICP-MS dating on 44 spots reveals several concordia clusters. The whole rock geochemistry of sample fits volcanic arc characteristic in the geotectonic discrimination diagrams. Dominant zircon data yield Upper Carboniferous and Permian magmatic ages 304.4 ± 2.3 and 288.6 ± 1.9 Ma. Two smaller clusters of Upper Devonian (376 ± 4.7 Ma) to Lower Carboniferous ages (351.9 ± 3.5 Ma) indicate probably contamination of ascending magmatic material. Youngest Triassic age found in three morphologically differing grains reflects probably lead loss. Described high-Mg basalt lava represents sub-aerial volcanism in volcanic arc environment developed over the N dipping subduction zone in the southwestern Mongolia in the time span from Uppermost Carboniferous to Permian during terminal stage of its activity.</p> 2020-12-21T05:54:19+00:00 ##submission.copyrightStatement## https://www.mongoliajol.info/index.php/MGS/article/view/1458 Modern glacier dynamics in Mt. Tsambagarav in the Mongolian Altai Mountain Range 2020-12-22T11:25:02+00:00 Tuyagerel Davaagatan dtuyagerel@gmail.com Alexander Orkhonselenge dtuyagerel@gmail.com <p>This study presents the modern glacier dynamics in Mt. Tsambagarav in the Mongolian Altai Mountain Range over the last four decades. This is the first review of this type of glacier dynamics for this massif. Changes in glacier area in Mt. Tsambagarav are estimated using normalized indexes (Normalized Difference Snow Index and Normalized Difference Principal Component Snow Index). Spatial distribution of the modern glaciers delineated with Landsat Multispectral Scanner (MSS: resolution of 80 m), Landsat Thematic Mapper (TM: resolution of 30 m) and Landsat Operational Land Imager (OLI: resolution of 30 m) imageries. Result shows that Mt. Tsambagarav has lost 51.7% of the glacier area from 132.24 km<sup>2</sup> in 1977 to 63.92 km<sup>2</sup> in 2017. The loss in glacier area for Mt. Tsambagarav during the last 40 years reflect the rapid response of the modern glacier to climate change, i.e., it is highly sensitive to solar insolation and/or rapidly rising local and regional mean annual temperatures. The remote sensing data and field survey suggest that the modern glaciers would be disappeared on a scale of decades. Rapid melting of the glacier in this massif contributes to surface water resources in western Mongolia. This study demonstrates the importance of spatial analysis in the remote area for understanding the context of changes in the modern glaciers.</p> 2020-12-21T05:57:04+00:00 ##submission.copyrightStatement## https://www.mongoliajol.info/index.php/MGS/article/view/1459 PCA analysis of soil geochemical data and environmental assessment of the pre-mining Shuteen area, South Mongolia 2020-12-22T11:25:03+00:00 Bayaraa Batkhishig bkhishig@must.edu.mn Bayarbold Manzshir bkhishig@must.edu.mn Baatar Munkhtsengel bkhishig@must.edu.mn Tsuchiya Noriyoshi bkhishig@must.edu.mn <p>There are widespread mineralized systems, occurrences, deposits that occurred in the South Gobi, Mongolia, where many of them already undergone mining activity. However, not all of them have a pre-mining environmental assessment. The Shuteen area is one of these highly prospective areas for mining; due to the porphyry copper system observed, prospecting and exploration projects have been carried out since 1980. Numerous prospecting and exploration works have been done during 1997–2007 and suspended last decade because of economic and political reasons. The area is located in a Gobi-desert environment and wind plays a main role in the transport and mobility of the elements. This research was conducted to assess the environmental condition of the area, based on soil, dry river sediment, and drinking water geochemistry. We are expecting the area has a naturally high concentration of some heavy metals in soil, concerning the geology and mineralization. The results show that the heavy metal content in the soil does not exceed the permissible limit of the Mongolian National standard on soil quality. Whereas, the water samples contain F- above the permissible limit guided in the Mongolian National Standard on drinking water quality. The unusual chemical composition of the water is related to the soil composition characteristic of the Gobi region. They are characterized by low alkali, high salinity and mineral/water ratios are high. Environmental assessment surveys determine the characterization of an areal geochemical base prior the development of later exploration or mining project, might have affect it and establish the initial environmental status.</p> 2020-12-21T05:59:30+00:00 ##submission.copyrightStatement## https://www.mongoliajol.info/index.php/MGS/article/view/1460 Investigаtion аnd Evaluation of Ecologicаl Destruction in А Mining Аreа in Mongoliа 2020-12-22T11:25:04+00:00 Zijun Li ptsogt@yahoo.com Purevsuren Tsogt ptsogt@yahoo.com <p>Аim of this study wаs to cаlculаte economic vаlue of destructed lаnd in Mongoliа in order to fаcilitаte restorаtion of mining аreа. Totаl economic vаlue is а universаl frаmework for estimаting аnd evаluаting economicаl dаmаge cаuse to environment due to mining аctivities аnd other technogenic production аctivities. Compensаtion for environmentаl аnd finаnciаl dаmаge cаn be determined bаsed on the following three cаtegories: initia restoration, restoration by compensation and evaluation of ecological damage. Main object of this study is direct economic vаlue of destructed environment due to Tumurtei iron ore mine аctivity. Аll estimаtions in this pаper аre mаde аccording to Mongoliаn legislаtion аnd lаws. During thаt project а totаl of 511.9 hectаres of аreа аre exposed to environment destruction. Estimаtion of ecologicаl dаmаge аre consisting of following pаrts: dаmаge to soil, dаmаge to surfаce аnd groundwаter resources, dаmаge to forest resources, dаmаge to vegetаtion аnd dаmаge to аnimаl fаunа. The аssessment of ecologicаl аnd finаnciаl dаmаge to the environment is performer in following stаges: 1. determine the аmount of potentiаl dаmаge to the environment; 2. cаlculаte аnd determine the аmount of dаmаge reduced аs а result of meаsures to reduce or eliminаte dаmаge to the environment during production аctivities; 3. estimаte the аmount of аctuаl dаmаge resulting from the operаtion. Results of this study concerning interests of mining entities аnd public entities, who аre in chаrge of regulаting such аctivities.</p> 2020-12-21T06:00:14+00:00 ##submission.copyrightStatement##