Mantle peridotites exposed in south Jazmourian comprise of lherzolite and porphyroclastic Cpx-bearing harzburgite in the lower part with chromitite lenses in the upper parts. Petrography and microprobe studies shows evidence of melt-peridotite interactions; post melting More
Mantle peridotites exposed in south Jazmourian comprise of lherzolite and porphyroclastic Cpx-bearing harzburgite in the lower part with chromitite lenses in the upper parts. Petrography and microprobe studies shows evidence of melt-peridotite interactions; post melting processes and subsolidus interactions, which has been associated with appearance of two generations of deformed primary pyroxene-olivine and fine-grained pyroxene-olivine-amphibole neoblasts. Second generation of minerals formed as inclusion, interstitial and fine-grain. These two groups of minerals have different geochemical characteristics, So that, the first group are comparable with abyssal peridotites and second group are comparable to suprasubduction (SSZ) peridotites. Thus, the chemical compositions of different generations minerals show different petrogenesis for ultramafic rocks in south Jazmourian. Whole rock chemical data indicate south Jazmourian peridotites have a depleted MORB mantle source which undergoing 10-20% partial melting. Thus this peridotites have experienced multistage evolution and show characteristics of the abyssal environment to suprasubduction zone. We are belived that peridotites transition from the abyssal environment to suprasubduction and affected by fluids derived from the subducted slab.
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Land Surface Temperature (LST) is one of the most important variables that provides important information about the physical and chemical properties of the litosphere, atmosphere and hydrosphere. Since this variable represents the first thermal reaction to environmental More
Land Surface Temperature (LST) is one of the most important variables that provides important information about the physical and chemical properties of the litosphere, atmosphere and hydrosphere. Since this variable represents the first thermal reaction to environmental changes, its analysis can provide valuable information to environmental scientists. In recent years, MODIS sensor data have been widely used to estimate LST. In the present study, MODIS sensor data (MOD11C3 & MYD11C3) were used to analyze the daytime LST on the Jazmourian basin (2003-2019). Extracted data were used after quality control and necessary processing to estimate daytime LST. Based on the results; LST values in the Jazmourian basin range from 20-55 °C and clearly follow the altitudes and latitudes. Seasonal analysis of the LST spatial distribution shows the winter and summer seasons with a range of 5-40 °C and 35-65 °C as the coldest and warmest seasons, respectively. Also in the monthly spatial distribution of LST, January and February had the lowest and June and July had the highest LST. The time series trend of LST anomaly indicates an increase of about 0.5 °C in the study period. Also, the spatial distribution of LST indicates the maximum of positive anomalies in the southwestern and central parts and the minimum of positive anomalies in the east of the basin.
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Water resources are one of the most important components of land life and sustainable development. In the present study, the study of time series changes in the area of Jazmourian Playa water areas, using the surface reflection data of Landsat 8 satellite from 2013 to More
Water resources are one of the most important components of land life and sustainable development. In the present study, the study of time series changes in the area of Jazmourian Playa water areas, using the surface reflection data of Landsat 8 satellite from 2013 to 2019, was considered and the Modified Normalized Water Difference Index (MNDWI) was used to separate the water areas on the images. Then the trend of changes in the area of water areas was estimated. All of these processes and satellite image analysis were performed in the Google Earth Engine software environment, which is a web and open source system for performing spectral and radiometric analyzes on satellite images. ArcGIS 10.5 software was also used to prepare spatial maps. . Findings showed that the area of the seasonal lake of Jazmourian Lake is estimated to be 21426 Km based on MNDWI index, approximately 1515 Km based on automatic water extraction index (AWEI) and 1610 Km2 based on water absorption ratio (WRI) index. On the other hand, the analysis of surface water production of Landsat images showed that the highest rate of change was related to temporary seasonal and new seasonal water zones, so that changes in temporary seasonal zones occupied an area of about 11245 km2 and new seasonal surface zones about 35355 km2. Is. Jazmourian plain water intake is related to the occurrence of seasonal floods and increased rainfall in the basin, so that a high correlation (R2 = 0.89) between the annual rainfall of the basin and the increase in the area of water areas resulting from the MNDWI index has been observed.
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