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Origin of Sulfur and Mode of Gypsum Formation in Central Iraqi Soils

Journal of Mountain Science 2013年第5期10卷 734-742页

作者： Sabar Rahi Jasem ALJEBOORY Ahmad MUHAIMEED mohammadhady farpoor KA SALIeM Soil Science Department College of AgricultureUniversity of Baghdad Soil Science Department College of AgricultureShahid Bahonar University of Kerman Ministry of Agriculture

The δ18O and 8D values of gypsum crystallization water together with δ18O and 834S of sulfates were used as reliable techniques to study source of sulfur and mode of gypsum formation in selected central Iraqi soils. Six representative pedons on different geologic units were studied. The slope of 3.9 for δ18O and 8D plot of gypsum crystallization water showed that evaporation was the major process of gypsum deposition in the study area. The mean 834S value of ＋17.58 %0 showed that Cretaceous sea sulfate followed by Tertiary is the source of sulfur in studied soils. The heavier 834S value （＋17.58 %0） of the study area compared to central Iran （＋13.5 %） proved that gypsum in central Iraq soils has been formed in the later stage of evaporation and that Iraqi landforms were cut off from the Tethys seaway after central Iran was evolved.

关键词： Sulfur geochemistry Gypsumcrystallization water Tethys Sea Iraq

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Normal DGP in varying speed of light cosmology

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Research in Astronomy and Astrophysics 2017年第3期17卷 49-54页

作者： Arvin Ravanpak Hossein Farajollahi Golnaz farpoor Fadakar Department of Physics Vali-e-Asr University Rafsanjan Iran Department of Physics University of Guilan Rasht Iran School of Physics University of New South Wales Sydney NSW 2052 Australia

Varying speed of light （VSL） has been used in cosmological models in which the physical constants vary over time. On the other hand, the Dvali, Gabadadze and Porrati （DGP） brahe world model, especially its normal branch, has been extensively discussed to justify the current cosmic acceleration. In this article we show that the normal branch of DGP in VSL cosmology leads to a self-accelerating behavior and therefore can interpret cosmic acceleration. Applying statefinder diagnostics demonstrates that our result slightly deviates from the ACDM model.

关键词： cosmology theory - cosmology miscellaneous

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