Results 21 to 30 of about 43,321 (210)

A Comparative Study of Different Machine Learning Algorithms in Predicting the Content of Ilmenite in Titanium Placer

Applied Sciences, 2020
In this study, the ilmenite content in beach placer sand was estimated using seven soft computing techniques, namely random forest (RF), artificial neural network (ANN), k-nearest neighbors (kNN), cubist, support vector machine (SVM), stochastic gradient
Yingli Lv, Q. Le, Hoang-Bac Bui, X. Bui, Hoang Nguyen, T. Nguyen‐Thoi, J. Dou, Xuang Song   +7 more
semanticscholar   +1 more source

Sulfuric Acid Leaching of Altered Ilmenite Using Thermal, Mechanical and Chemical Activation

Minerals, 2020
The kinetics of the sulfuric acid leaching of altered ilmenite, mechanisms, and process intensification methods were studied. The effect of changing the chemical composition during grinding was determined.
A. V. Dubenko, M. Nikolenko, A. Kostyniuk, B. Likozar   +3 more
semanticscholar   +1 more source

Atom probe tomography of space‐weathered lunar ilmenite grain surfaces

Meteoritics and Planetary Science, 2020
The surfaces of airless bodies, such as the Moon and asteroids, are subject to space weathering, which alters the mineralogy of the upper tens of nanometers of grain surfaces.
J. Greer, S. Rout, D. Isheim, D. Seidman, R. Wieler, P. Heck   +5 more
semanticscholar   +1 more source

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

Geological Journal, EarlyView.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae, Md. Sazzadur Rahman, Gao Pin, M. Santosh, Wataru Fujisaki, Sam Uthup, Prince Mandingaisa   +6 more
wiley   +1 more source

New Magnetite Reference Material for SIMS δ18O Measurements and a Study of Precision and Accuracy Due to Crystal Orientation Effects

Geostandards and Geoanalytical Research, EarlyView.
Key Points A new magnetite reference material (PF21mt) is available for δ18O measurements by SIMS. Reproducibility of measurement results in two laboratories suggest orientation bias of ±2‰ (2s) at 20 keV. Repeatability improves to ±1‰ (2s) when using a 13 keV protocol, suggesting reduced orientation bias. In situ isotope ratio measurements provide the
Michelle Ulrich, Daniela Rubatto, Maria Rosa Scicchitano, Benita Putlitz, Thomas Bovay   +4 more
wiley   +1 more source

Coesite Discovery in Eclogites Confirms UHP Metamorphism in the Orlica‐Śnieżnik Dome (SW Poland)

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Eclogite lenses are exposed within the orthogneiss‐dominated core of the Orlica‐Śnieżnik Dome in the Sudetes, which forms the northeastern margin of the Bohemian Massif (Variscan Belt of Central Europe). The presence of coesite inclusions in garnet and omphacite confirms that these eclogites underwent ultrahigh‐pressure metamorphism.
Małgorzata Nowak, Lucie Tajčmanová, Marcin Dąbrowski, Iris Buisman, Jacek Szczepański   +4 more
wiley   +1 more source

Isothermal kinetics of carbothermic reduction of ilmenite concentrate with the addition of sodium carbonate

, 2020
The isothermal kinetics of carbothermic reduction of low grade ilmenite concentrate with the addition of sodium carbonate which was regarded as a novel process to obtain high quality UGS slag used for chlorination process through the semi-molten states ...
Xiaodong Lv, Dan Chen, Yun-tao Xin, J. Dang, W. Lv, X. Lv   +5 more
semanticscholar   +1 more source

Розробка технології збагачення розсипних титанових руд в умовах ТОВ ВКФ «Велта» [PDF]

, 2018
Об’єктом дослідження є технологія збагачення розсипних ільменітових руд. Предметом досліджень є ільменітові руди розсипного родовища. Метою дипломної роботи є зменшення втрат ільменіту з відходами магнітного збагачення розсипних руд Берзулівського ...
Pecherskiy, Vadym, Печерський, Вадим Андрійович   +1 more
core  

Deformation of continental crust along a transform boundary, Coast Mountains, British Columbia [PDF]

, 2010
New structural, paleomagnetic, and apatite (U-Th)/He results from the continental margin inboard of the Queen Charlotte fault (~54°N) delineate patterns of brittle faulting linked to transform development since ~50 Ma.
Bogue, Scott W., Dodson, Karen, Farley, Kenneth A., Rusmore, Margaret E., Woodsworth, Glenn J.   +4 more
core   +1 more source

New knowledge about shock events that affected the L‐chondrite parent body from two heavily shocked L6 meteorite finds

Meteoritics &Planetary Science, EarlyView.
Abstract We report new results from a study of shock‐related features in the L6 ordinary chondrites Northwest Africa (NWA) 4672 and NWA 12841. Our observations confirm the occurrence of eight high‐pressure (HP) minerals in each meteorite, namely, ringwoodite, majorite, akimotoite, wadsleyite, albitic jadeite, lingunite, tuite, and xieite.
I. Baziotis, L. Ferrière, C. Ma, J. Hu, D. Palles, P. D. Asimow   +5 more
wiley   +1 more source