Results 51 to 60 of about 2,180 (204)

http://fsu.ua/index.php/en/2017/2-2017-40/2017-02-099-113-kononenko

Ribogospodarsʹka Nauka Ukraïni, 2017
Purpose.To describe the basic physical-chemical and biological properties of certain minerals of volcanic origin, which are deposited in Ukraine.To examine and make a comparative assessment of their chemical composition and biological properties ...
O. Baturevich
doaj   +1 more source

Authigenic clay mineral evidence for restricted, evaporitic conditions during the emergence of the Ediacaran Doushantuo Biota

Communications Earth & Environment, 2022
The Ediacaran-age Doushantuo Formation, which hosts some of the oldest animal fossils, was likely deposited in a restricted, mildly evaporitic lagoon environment, according to petrographic analyses of saponite clays that suggest an authigenic origin.
Shujun Han, Stefan C. Lӧhr, April N. Abbott, Andre Baldermann, Martin Voigt, Bingsong Yu   +5 more
doaj   +1 more source

Effect of the time factor on the hydraulic activity of mechanically activated saponin-containing powder [PDF]

Нанотехнологии в строительстве
Introduction. The article examines the problem of the development of transport infrastructure in the Solovetsky archipelago and proposes a solution to reduce the cost of manufacturing reinforced concrete slabs for the road surface.
Marina V. Morozova, Maria A. Frolova
doaj   +1 more source

Salt Range Formation of Pakistan Preserves Unique Record of Volcanic Fertilization During the Ediacaran Shuram Excursion

Terra Nova, EarlyView.
ABSTRACT Thin, discontinuous, organic‐rich oil shale beds in the siliciclastic‐evaporitic Salt Range Formation (SRF) of Pakistan are of approximate Neoproterozoic to Cambrian age based on stratigraphic constraints. The beds are enriched (26–43 wt.% total organic carbon, TOC) in aliphatic organic matter (OM) of low thermal maturity despite their ...
Paul C. Hackley, Ryan J. McAleer, Jay M. Thompson, Brett J. Valentine, Imran Khan   +4 more
wiley   +1 more source

The Role of Chlorate‐Driven Oxidative Weathering in Shaping Clay Deposits on Mars

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract Oxidized clays and the widespread Al/Si‐over‐Fe/Mg stratigraphy on Mars imply prolonged water‐rock interactions and efficient oxidative weathering despite the largely anoxic conditions of Early Mars when most deposits formed during the climate optimum.
Jiawei Wang, Nicole M. Fernandez
wiley   +1 more source

Effect of Calcination Temperature on the Synthesis of ZrO₂-Pillared Saponite to Catalytic Activity in Menthol Esterification

Indonesian Journal of Chemistry, 2016
The influence of calcination temperature on the synthesis of zirconia-pillared saponite (PILS) and on its catalytic activity in menthol esterification has been studied. Zirconia pillarization was conducted using zirconium tetraisopropoxide as a precursor
Is Fatimah, Dwiarso Rubiyanto, Nanda Candra Kartika   +2 more
doaj   +1 more source

Characterizing Incoming Cocos Plate Structure Outboard of the Guerrero Gap and Adjacent Segments Offshore Mexico: Implications for Along‐Strike Variations in Megathrust Slip Behavior

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract Megathrust slip behavior in subduction zones can vary along‐strike, yet the mechanisms driving this variability remain uncertain. The Middle America trench offshore Mexico provides an ideal setting to investigate the structural controls on megathrust slip behavior.
Davis Hagemeier, Anne Bécel, Tanner Acquisto, Víctor M. Cruz‐Atienza, Brandon Shuck, Donna J. Shillington, Shuoshuo Han, Brian Boston, Jorge A. Real, Yoshihiro Ito, Grace Ward   +10 more
wiley   +1 more source

(Table 4) Cation abundances of saponite at DSDP Sample 69-504B-15-1,79-81

, 1983
(Table 4) Cation abundances of saponite at DSDP Sample 69-504B-15-1,79 ...
Anthony J Andrews (6960554), Dollase, W A, M E Fleet (6970916), W A Dollase (6970913), Fleet, M E, Andrews, Anthony J   +5 more
core   +1 more source

Corundum Discovered by SuperCam and the Perseverance Rover at Jezero Crater, Mars

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Mars is primarily composed of mafic mineral assemblages and their alteration products, but small, scattered rocks strewn across the landscape offer clues to greater petrological diversity. While traversing the Jezero crater rim, the Perseverance rover encountered several plagioclase‐rich light‐toned float rocks.
A. M. Ollila, O. Beyssac, A. Fau, O. Forni, E. Clavé, P. Beck, C. C. Bedford, V. Payre, E. Dehouck, S. A. Connell, J. A. Manrique, P. Pilleri, O. Gasnault, G. M. Martinez, A. Udry, S. Bernard, P. Gasda, T. Acosta‐Maeda, R. B. Anderson, T. S. J. Gabriel, F. Calef, J. F. Bell III, J. Maki, S. Schröder, C. Quantin‐Nataf, J. R. Johnson, B. Chide, K. Rammelkamp, F. Poulet, C. Royer, M. Rock, N. L. Lanza, S. K. Sharma, G. Lopez‐Reyes, T. Fouchet, J. Comellas, A. Zastrow, E. Cloutis, R. C. Wiens, A. Cousin, S. Maurice, S. Clegg, P. Bernardi, T. Nelson   +43 more
wiley   +1 more source

(Table 3) Geochemistry of saponite in DSDP Sample 69-504B-15-1,79-81

, 1983
(Table 3) Geochemistry of saponite in DSDP Sample 69-504B-15-1,79 ...
Anthony J Andrews (6960554), Dollase, W A, M E Fleet (6970916), W A Dollase (6970913), Fleet, M E, Andrews, Anthony J   +5 more
core   +1 more source