H. Moradi; H. Mohseni; M. Moeini; R. Behbahani
Abstract
Sediment transport occurs through various processes, whereby their origin is of great importance. Surface sediments of the Semnan province and NE Isfahan province (Khour and Biabanak) were sampled to examine the possibility of transportation by wind. Hence, 43 samples collected from surficial sediments ...
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Sediment transport occurs through various processes, whereby their origin is of great importance. Surface sediments of the Semnan province and NE Isfahan province (Khour and Biabanak) were sampled to examine the possibility of transportation by wind. Hence, 43 samples collected from surficial sediments of the Semnan and Isfahan provinces were analyzed using ICP method in the geochemistry lab of the Geological Survey of Iran. After testing outlier data were excluded from any further processing. To ensure confidence of any possible relation between elements, multiple statistical approach including principal component analysis (Pearson correlation), correlation analysis, cluster analysis, factor analysis and varimax boxes were applied. The results show that the elements including Zn, V, Ti, Sn, Sc, P, Ni, Mn, Cu, Cr, Co, Cd, Ba, represent reasonable correlation for samples of the Semnan province. Coeval existing of Co, Mn and Ni may reflect their geogenic source, particularly from intermediate to basic volcanic rocks exposed around the area. In Khour and Biabanak area, V, Ti, Sn, Sc, Pb, P, Ni, Mn, Cu, Cr, Co, Cd, Zn are closely related, which probably points to their origin from altered ultramafic rocks of the Proterozoic-early Paleozoic exposed around the area. There are positive factors in levels 1, 3 and 4 may be affected by various geological formations exposed around the studied areas. However, combined role of human or agricultural activity are more plausible for level 3 in factor analysis.
R Behbahani; R Lak; N Chanani; G Hosseinyar
Abstract
In order to study of organic geochemistry of bed sediments in Khowr-e-Mussa and its adjacent marine areas, 61 surface sediment samples were collected. Based on granulometric analysis of the sediments, 4 major sedimentary types comprising mud, sandy mud, muddy sand, and slightly gravelly muddy sand were ...
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In order to study of organic geochemistry of bed sediments in Khowr-e-Mussa and its adjacent marine areas, 61 surface sediment samples were collected. Based on granulometric analysis of the sediments, 4 major sedimentary types comprising mud, sandy mud, muddy sand, and slightly gravelly muddy sand were determined. The bed sediments are mainly composed of terrigenous (quartz, feldespar, rock fragments, carbonate lithics and clay minerals) and chemical – biochemical (bivalve, gastropod, foraminifera, ostracod and bryozoa) particles. Based on the organic geochemistry studies, the total organic carbon (TOC) varies from 0.11 to 0.70 %wt, which increases in the muddy sediments. The studied kerogens (based on S2/TOC diagram) indicate that the kerogen types III (%33) and mixture of III-II (%55) are the most abundant. In addition, the hydrogen index versus Tmax diagram, revealed the similar results. The studied kerogens indicated that this part of the Persian Gulf affected by the transportation of terrestrial (fluvial, III type) rather than the marine organic matter (II type).
G. R Hosseinyar; R Moussavi-Harami; R Behbahani
Abstract
Using high-resolution shallow seismic data, we have investigated the seismic facies in northern Qeshm Island waterways in East of Persian Gulf. Seismic data obtained with Sub-bottom profiler and then interpreted by ISE software. Studies lead to recognizing 7 types seismic facies on seismic data. These ...
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Using high-resolution shallow seismic data, we have investigated the seismic facies in northern Qeshm Island waterways in East of Persian Gulf. Seismic data obtained with Sub-bottom profiler and then interpreted by ISE software. Studies lead to recognizing 7 types seismic facies on seismic data. These facies are detectable by amplitude, continuity, geometry, internal pattern and staking pattern from each other. Results show that seismic facies formed in two various environments condition. Lower part facies have low amplitude with high lateral continuity and sustainability; but upper seismic facies have various amplitude with low lateral continuity. These facies have deposited in five periods that separate with erosional surfaces. Changes of depositional environments and province region of sediment supply can be realize from seismic facies. So, through deposition of LAP-C and MAC facies sediments have supplied from Qeshm Island; but, at the time of deposition of LAC and HAC sediments interred from the North.
