نتایج جستجو برای: qulqula radiolarian formation
تعداد نتایج: 527562 فیلتر نتایج به سال:
Calcareous nannofossil biostratigraphy and carbon-isotope stratigraphy on bulk organics of the middle-upper Eocene Souar Formation (Tunisia) allow for a refined this interval in southwestern Neo-Tethys margin. The represents deepest sedimentary deposits central northern Tunisian Basin was only dated previously by coarse data planktonic foraminifera. Together with our new data, correlation is pr...
Abstract A diverse and well-preserved radiolarian assemblage from the Malongulli Formation, New South Wales, Australia, contains 13 species representing 10 genera six families. One new genus, Wiradjuri , is introduced to accommodate pre-Devonian single-shelled entactiniid taxa, one species, Secuicollacta malongulliensis recorded together with some previously described forms. The microstructures...
The configuration and timing of the Arabia-Eurasia continental collision, part broader Alpine-Himalayan collisional system, remains controversial. We conducted sandstone petrology, detrital zircon U-Pb-Hf isotopic trace element analysis, Cr-spinel electron microprobe geochemical analysis samples from Paleocene to Miocene peripheral foreland strata in interior Fars, southern Iran. These data wer...
A 95 m thick succession of grey siliceous limestone and marl on Mount Rettenstein in the Northern Calcareous Alps allowed us to study well-preserved diverse radiolarian assemblages across Sinemurian–Pliensbachian boundary. The distribution 31 most characteristic species is presented. Ammonites Jamesoni Subzone, topmost subzone Zone, have been previously found upper part section. data are comple...
Some Fe and Fe-Mn deposits are found within sedimentary pelagic rocks and radiolarian cherts of the Khoy ophiolite. Mn-Fe mineralizations in Safo area north of Chalderan City are examples of them. In Safo area, deposition of manganese occurred as lense-like orebodies in different horizons within pelagic rocks. They are stratiform and have syn-sedimentary origin. Mineralogically, braunite, pyrol...
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