نتایج جستجو برای: ferruginous composition

تعداد نتایج: 260148  

Journal: :Heritage Science 2023

Abstract Apart from many lost wax cast metal fragments, crucible fragments and several heated sediment nodules were found at the Chalcolithic site Fazael 2 (central Jordan Valley). Petrographic investigations on revealed features characteristic of Southern Levantine casting moulds. Heating temperatures assessed using infrared spectroscopy, showing that did not vitrify clay fraction in Consequen...

2015
Linda V. Godfrey Simon W. Poulton Gray E. Bebout Philip W. Fralick

17 Nitrogen cycling has been evaluated across a depth transect in the late Paleoproterozoic 18 Animikie Basin, spanning the end of Earth’s final period of global iron precipitation and a major 19 transition to euxinic conditions in areas of high productivity. Sediments from near shore where 20 productivity was highest have N compositions up to ~3‰ higher than at more distal sites. 21 This sugg...

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