Results 31 to 40 of about 2,981,289 (294)

dragon: A New Tool for Exploring Redox Evolution Preserved in the Mineral Record

Frontiers in Earth Science, 2020
The flow of energy and elements between the geosphere and biosphere can be traced through changing redox chemistry of Earth’s surface. Deep-time trends in the mineral record, including mineral age and elemental composition, reveal a dynamic history of ...
Stephanie J. Spielman, Eli K. Moore
doaj   +1 more source

Ti-Fe mineralization in Bafq anomaly no. 15, Central Iran: Insights to mineralogy and mineral chemistry [PDF]

پترولوژی, 2021
The Ti- Fe mineralization in Bafq 15 anomaly located 35 Km NW of Bafq city, and is a part of Poshte Badam Block in the Central Iran. Mineralization including magnetite, titanomagnetite, ilmenite, and minor pyrite which hosted by gabbro and pyroxenite ...
Sakine Amraei, Mehrdad Behzadi, Mohammad Yazdi, Hossein Kouhestani, Majid Ghasemi Siani   +4 more
doaj   +1 more source

Mineral chemistry and thermobarometry of gabbroic rocks from the Pargeh area (NE Qazvin): A key for understanding the crystallization conditions [PDF]

پترولوژی
Introduction Mineral chemistry data as well as petrography provide a comprehensive picture of magma crystallization conditions that support the conclusions based on geochemical data. In addition, the chemical composition of minerals such as clinopyroxene,
Nahid Naseri, Reza Zarei Sahamieh, Matthew Leybourne, Anderson Costa Dos Santos, Ahmad Ahamadi Khalaji   +4 more
doaj   +1 more source

The Mineral Chemistry Networks of Tin and Tungsten Reflect Metallogenic Events of the Mesozoic

Geosciences
Continental remobilization is a crucial driver of metallogenesis and the formation of ore deposits. Some of the world’s largest mineral deposits of the economically valuable elements tin (Sn), tungsten (W), gold (Au), copper (Cu), lead (Pb), and zinc (Zn)
Eli K. Moore, Shaunna M. Morrison, Amber Hatter   +2 more
doaj   +1 more source

Kinetics Study of Solvent and Solid-Phase Extraction of Rare Earth Metals with Di-2-Ethylhexylphosphoric Acid

Metals, 2020
The kinetic features of solvent and solid-phase extraction of yttrium and iron (III) from simulated and industrial phosphoric acid solutions are revealed.
Olga Cheremisina, Vasiliy Sergeev, Maria Ponomareva, Alexandra Ilina, Alexander Fedorov   +4 more
doaj   +1 more source

Mineral maturity and crystallinity index are distinct characteristics of bone mineral [PDF]

, 2010
The purpose of this study was to test the hypothesis that mineral maturity and crystallinity index are two different characteristics of bone mineral. To this end, Fourier transform infrared microspectroscopy (FTIRM) was used.
Delmas, Pierre D., Delmas, Pierre, D., Boivin, Georges, Panczer, Gérard, Rey, Christian, Farlay, Delphine   +5 more
core   +1 more source

Palladinized graphene oxide-MOF induced coupling of Volmer and Heyrovsky mechanisms, for the amplification of the electrocatalytic efficiency of hydrogen evolution reaction

Scientific Reports, 2021
In this study, a nanocomposite of palladium supported graphene oxide (GO)/metal–organic framework (MOF) was prepared using electroless deposition of Pd on GO followed by impregnation method of Pd@GO and MOF. The prepared materials were characterized with
Mogwasha D. Makhafola, Kwena D. Modibane, Kabelo E. Ramohlola, Thabiso C. Maponya, Mpitloane J. Hato, Katlego Makgopa, Emmanuel I. Iwuoha   +6 more
doaj   +1 more source

Biotite as a petrogenetic discriminator in the polymetamorphosed rocks: A case study from the Champaner supracrustal rocks, Western India

Geosystems and Geoenvironment
The mineral chemistry of Fe-Mg biotite has served as an aid to the petrogenesis of igneous rocks, especially for identifying the parent magma compositions. Though the interpretation of igneous and metamorphic processes utilizing biotite mineral chemistry
Parita K. Gorania, Gayatri N. Akolkar, Aditya U. Joshi, Manoj A. Limaye, Mahendra K. Singh   +4 more
doaj   +1 more source

Computer simulation of structure and dimensions of oxygen-octaadric clusters in lithium niobate crystal and the dynamics of their development with changes in composition [PDF]

Физико-химические аспекты изучения кластеров, наноструктур и наноматериалов, 2017
The peculiarities of formation of energetically equilibrium dipole oxygen-octahedral clusters in the structure of a ferroelectric crystal of lithium niobate (LiNbO3) have been studied by computer simulation.
V.M. Voskresensky, O.R. Starodub, N.V. Sidorov, M.N. Palatnikov   +3 more
doaj   +1 more source

Design and analysis strategies for robust microbiome ageing research

FEBS Letters, EarlyView.
The gut microbiome changes with age and associates with age‐related morbidity and mortality, establishing it as a potential biomarker and intervention target for ageing. Realising this potential requires methodological rigour, yet distinguishing biological signals from methodological artefacts remains challenging across cohorts. This review provides an
Mark Olenik, İsmail Güderer, Yi Wang, Tayyaba Alvi, Prasoon Pandey, Handan Melike Dönertaş   +5 more
wiley   +1 more source