نتایج جستجو برای: igneous rock
تعداد نتایج: 40969 فیلتر نتایج به سال:
The Malek Siah Kuh igneous complex of is located about 35 km north of Zahedan and among the villages of Lar down, Qarqoruk and Horamak. According to the results of rock naming diagrams, the volcanic rocks of Malek Siah Kuh complex have a combination of basaltic andesitic and trachyandesitic and its plutonic rocks show a combination of granodiorite and diorite. Using field studies and lithologic...
We present a method to determine (88)Sr/(86)Sr and (87)Sr/(86)Sr simultaneously. The former variation reflects the mass-dependent isotopic fractionation through the physico-chemical processes, and the latter originates from beta(-)-decay of the parent nuclide (87)Rb as well as the mass-dependent isotopic fractionation. In order to determine the mass-dependent isotopic fractionation, the mass-di...
Ten road cut samples collected from five lithological sections of Lokoja sandstone formation in the Middle Niger basin were investigated using integrated granulometric, petrographic and geochemical analyses. Results of grain size analysis; standard deviation and skewness which ranges from 0.08 to -0.05 and 0.59 to -0.07 respectively suggest very well sorted to moderately well sorted sediments. ...
At the base of Shemshak Formation in the south Azadshahr area, some igneous mafic rocks are discovered recently as olivine gabbro bodies and pegmatoid alkali-diorite dikes. Rock-forming minerals of olivine gabbro includes olivine, clinopyroxene and plagioclase, alkali-diorites are composed of large amphiboles and plagioclase. Major and trace elements characteristics of these rocks indicate the...
This study has focused on provenance of Eslamlu metapelites, NW Iran. Whole rock chemistry analysis has revealed that these metapelites are rich in Iron and Aluminum and as a result the modal abundance of garnet (Almandine) is high. But those samples which are rich in SiO2 are poor in Al2O3, therefore, Eslamlu metapelites have less cordierite and aluminosilicates. The position of different samp...
a r t i c l e i n f o a b s t r a c t Rock alteration and rind formation in analog environments like Antarctica may provide clues to rock alteration and therefore paleoclimates on Mars. Clastic sedimentary rocks derived from basaltic sources have been studied in situ by martian rovers and are likely abundant on the surface of Mars. However, how such rock types undergo alteration when exposed to...
چکیده ندارد.
چکیده ندارد.
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید