B Bahrambeigi; D Raeisi; S.K Alavipanah; S.H Moeinzadeh
Abstract
Gandom Beryan or Burned Sand region is located in the LutDesert, NW of Kerman. This region has always been under consideration due to its high temperature. In this study, by utilizing thermal Remote Sensing studies, ENVI software, and thermal images ETM + (imaging time 10 am on Wednesday 7 October 2011) ...
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Gandom Beryan or Burned Sand region is located in the LutDesert, NW of Kerman. This region has always been under consideration due to its high temperature. In this study, by utilizing thermal Remote Sensing studies, ENVI software, and thermal images ETM + (imaging time 10 am on Wednesday 7 October 2011) the surface temperature of Gandom Beryan was measured. Non-uniform distribution of basaltic rocks, erosion, and fracturing of rocks in Gandom Beryan has caused the calculated surface temperature in the southern part of the Gandom Beryan, which has been covered with dark basaltic rocks, shows reflections intensity more than the northern part of the study area. On the other hand, the photolineament index factor shows that the zones with greater fracture intensity than the other side have less temperature. The existence of mountains in all directions of the Lut desert )north, south, east, and west) have limited the penetration of sea moisture especially from the Indian Ocean, and this problem causes the increasing of drought, sunshine, and decreasing of cloud in this region. In general, desert location, including latitude and low altitude are factors that cause the high temperature of Basaltic messa besides the special surface absorption of basalt. Respect to daily and monthly corrections, the final temperature is calculated as the estimated maximum temperature, which is at least 76° C for Basaltic messa in Gandom Beryan and based on the surveys, this region can be considered as one of the Earth thermal poles.
D Raeisi; S Dargahi; S.H Moeinzadeh; M Arvin; B Bahrambeigi
Abstract
Gandom-Berian area, located on southern part of the Kavir-e Lut, covers an area around 480 km2 and morphologically is a covered messa by very dark basaltic lava flows. Their major minerals are olivine and clinopyroxene phenocrysts along with plagioclase microlites and their main textures are microlitic ...
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Gandom-Berian area, located on southern part of the Kavir-e Lut, covers an area around 480 km2 and morphologically is a covered messa by very dark basaltic lava flows. Their major minerals are olivine and clinopyroxene phenocrysts along with plagioclase microlites and their main textures are microlitic porphyry to glomeroporphiry with interestal to intergranular groundmass. The in line position of volcanic cones along the line of movements of Nayband fault show its effect on the formation of Gandom-Berian basaltic magma. The genetic realationship of these lava flows with deep seated lithospheric fractures as a result of Nayband fault, the presence of mantle xenoliths and alkaline nature of basalt all reveal a fast deep ascending of magmas. Based on geochemical analysis and occurrence of nepheline in the norm composition the Gandom-Berian basaltic lava flows belong to basanite-tephrite group. The investigation on Gandom-beriyan alkali basalts clearly shows their relationships to an intera-continental extensional environment. Low ratio of Ce/Nb, Th /Nb, U/Nb, Ba/Nb and High levels Zr with mean 234.81 indicate a none depleted asthenospheric mantle source the origin of Gandom-Berian basaltic lava flows. Enrichment and depletion of light and heavy rare earth elements respectively indicate the existence of garnet in the source rock.
