نتایج جستجو برای: sedimentary environment
تعداد نتایج: 527372 فیلتر نتایج به سال:
Macrofossil analysis of a composite 19 m long sediment core from Rano Raraku Lake (Easter Island) was related to litho-sedimentary and geochemical features of the sediment. Strong stratigraphical patterns are shown by indirect gradient analyses of the data. The good correspondence between the stratigraphical patterns derived from macrofossil (Correspondence Analysis) and sedimentary and geochem...
The formation of ordered particle arrays plays an essential role in nanotechnology, biological systems, and inorganic photonic structures in the geosphere. Here, we show how ordered arrays of amorphous silica spheres form in deeply weathered lithologies of the Great Artesian Basin (central Australia). Our multi-method approach, using optical and scanning electron microscopy, X-ray microdiffract...
بررسی کانهزایی و ژئوشیمی کانسار آهن دهزمان، (جنوب غرب بردسکن) و مقایسهی آن با کانسارهای آهن نواری
Dehzaman iron deposit is located in southwest of Bardaskan, Khorasan Razavi Province. The area is situated in northeastern Posteh-Badam block based on structural map of Iran. In the deposit, hematite band with 1.5 km long, 6 meters thickness and east-west trending is located within Pre-Cambrian metamorphozed sedimentary rocks as conform. Field evidences such as consolidated hematite, present o...
Correlations between mapping units of costal sedimentary basin and interpretation of piezocone test results are presented and discussed based on examples from Caravelas strandplain, (State of Bahia), Paranaguá (State of Paraná) and Guarujá bays (State of São Paulo), Brazil. Recognizing that the sedimentary environment was mainly controlled by sea level fluctuations led to the interpretation of ...
Diverse microbial communities and numerous energy-yielding activities occur in deeply buried sediments of the eastern Pacific Ocean. Distributions of metabolic activities often deviate from the standard model. Rates of activities, cell concentrations, and populations of cultured bacteria vary consistently from one subseafloor environment to another. Net rates of major activities principally rel...
The sediments of the Playa Lake are sensitive indicators of local climates that any change in climate, hydrology, and sedimentary environment will cause changes in the physical and chemical properties of the sediments. These sediments create a valuable and important archive with high resolution to examine these changes in the past. One method of studying climate change during quaternary and oft...
sediments of the nezam-abad area, south-east of bam have been studied for the first time. sedimentary facies are composed of thin-bedded clay, silt and fine grained sand interbedded with thin laminated limestone. chemical analysis of x-ray florescent indicates that more than 50% of sediments consist of silisium and aluminum oxide that can be used for reconstruction of environment. ninety eight ...
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