This paper presents the results of complex hydro-geochemical studies natural waters Kastropol tract. It was found that studied are characterized mainly by HCO3 Ca and Mg-Ca composition with a total mineralization value varying in range from 220 to 2306 mg/dm3 silicon content 0.78 6.08 . revealed geochemical parameters medium vary reducing oxidizing Eh -146.6 – +275.9 mV, pH 7.4 8.5 O2 1.80 7.73...

A protocol for selecting representative silicate compositions comparative testing of gas turbine coating materials is presented. It begins with a curated dataset engine deposits and naturally occurring siliceous debris including volcanic ashes, sands, dusts. The are first reduced to the five major oxides—those Ca, Mg, Fe, Al, Si—and then distilled further using principal component analysis k-me...

Abstract The South Banda back-arc basin is a morphotectonic environment that part of the Basin, characterized by flat morphology with depths ranging from 5000m to 6000m. purpose this paper analyze and relate morphometric aspects Quaternary seabed sediment deposits deposited in an active tectonic Sea area, including information on type its distribution as well relation volcanic hosted-massive su...

PREMISE OF THE STUDY Heterokont algae of the class Synurophyceae, characterized by distinctive siliceous scales that cover the surface of the cell, are ecologically important in inland waters, yet their evolutionary history remains enigmatic. We explore phylogenetic relationships within this group of algae relative to geologic time, with a focus on evolution of siliceous components. METHODS W...

The depth of the ocean is plentifully populated with a highly diverse fauna and flora, from where the Challenger expedition (1873-1876) treasured up a rich collection of vitreous sponges [Hexactinellida]. They have been described by Schulze and represent the phylogenetically oldest class of siliceous sponges [phylum Porifera]; they are eye-catching because of their distinct body plan, which rel...

In the 90-m river bank of middle reaches Icha River, thick strata volcano-sedimentary deposits represented by pyroclastic rocks and siliceous tuffites with layers diatomites were studied. Representative diatom assemblages assigned to Middle Miocene Denticulopsis hyalina Zone (14.9–13.1 Ma) indicate relatively deep-water conditions marine basin. Comparison data on from reference sections Western...

Late Permian coal deposits are widely distributed throughout southwestern China. This paper describes the petrological composition of last seam in Longmendong section Emeishan area during latest Changhsingian (Permian) and records important information regarding evolution mass extinction event that occurred at end Permian. The results show dominant maceral group is vitrinite, followed by liptin...