Results 31 to 40 of about 394,527 (166)

Characterization of Gold of the Murcielago Fluvial Placer (Central Honduras) and Its Possible Primary Sources

Geosciences, 2023
The Murcielago gold placer is located in the Lepaguare Valley, Olancho Department (Central Honduras). The placer mineralogy includes silicates (quartz, garnets, amphibole, Ca-pyroxene, micas, epidote, and tourmaline); calcite; and in the heavy fraction ...
Sabrina Nazzareni, Simona Alunno, Federica Zaccarini, Michele Mattioli, Alessandro Murroni, Alessandro Di Michele, Alberto Renzulli   +6 more
doaj   +1 more source

Newly identified iron oxide-apatite deposit in Carboniferous marine volcanic rocks in the Beishan area and its implications for regional metallogeny: A case study of the Biyushan iron deposit, Inner Mongolia

地质科技通报
Objective Numerous iron deposits hosted in Carboniferous marine volcanic rocks occurred in the Beishan Orogenic Belt, Eastern Tianshan.The Biyushan iron deposit, located at the northwestern margin of Inner Mongolia, is a typical iron deposit hosted in ...
Hao HU, Yong YIN, Lei XU
doaj   +1 more source

Mineralogy and Petrology of an Olivine Diabase Sill Complex and Associated Unusually Potassic Granophyres, Sierra Ancha, Central Arizona [PDF]

, 1969
The Precambrian Sierra Ancha sill complex, 700 to 800 feet thick, was intruded into flat-lying sedimentary rocks of the Apache Group in central Arizona. The bulk of the complex consists of a central layer of feldspathic olivine-rich diabase and upper and
Smith, Douglas
core   +1 more source

MINERAL FORMS OF TUNGSTEN AT THE POROKHOVSKOE AND YUGO-KONEVSKOE DEPOSITS (SOUTH URALS) [PDF]

Минералогия
The ore hand specimens and technological ore samples from the Porokhovskoe and Yugo-Konevskoe W greisen deposits in the South Urals are studied. The major W minerals of primary ores at both deposits include hübnerite and scheelite.
D.A. Rogov, E.V. Belogub, K.A. Novoselov, M.A. Rassomakhin, R.R. Irmakov, A.E. Chugaev   +5 more
doaj   +1 more source

Appraisal of Six Natural Mica Reference Materials for In Situ Rb‐Sr Geochronology

Geostandards and Geoanalytical Research, EarlyView.
Key Points Evaluated six natural mica reference materials for in situ LA‐ICP‐MS/MS Rb‐Sr geochronology using geochemical, microstructural and isotopic characterisation. Identified robust primary reference materials: Mount Dromedary biotite (99.37 Ma) and Mica‐Fe biotite (307.75 Ma). La Posta biotite and Högsbo muscovite are suitable secondary reference
Hugo K.H. Olierook, Bruno V. Ribeiro, Janne Liebmann, Kai Rankenburg, Fred Jourdan, Ahmad Redaa, Jarred C. Lloyd, Thomas M. Belgrano, Carlos R. Corella Santa Cruz, Yujin Jegal, Julien Mercadier, Catherine Zimmermann, Jie Yu, Andreas Zametzer, Christopher L. Kirkland, Sarah E. Gilbert, Craig D. Storey, Luc S. Doucet, Isabelle Jones, Louisa Stokes, Thomas Zack, Delia Rösel, Denis Fougerouse, Jonas Kaempf, Priyanjan Datta, Hijas Hameed, Noreen J. Evans, Malcolm P. Roberts, Juraj Farkas, Stijn Glorie, Celia Mayers, R. Adam Frew, Sarah Al Odeh, Chloe E. Roche, Massimo Chiaradia, Alicia M. Cruz‐Uribe, Alan S. Collins, Andreas Karlsson, Anusha Shantha Kumara   +38 more
wiley   +1 more source

Magnetite-rutile symplectite in ilmenite records magma hydration in layered intrusions

, 2022
The textures and geochemical characteristics of the rocks in layered intrusions potentially provide insights into the physicochemical processes that have taken place in mafic magma chambers.
Xian, Haiyang, Tan, Wei, Wang, Christina Yan, Reddy, Steven M., Xing, Changming, He, Hongping, Wei Tan, Christina Yan Wang, Changming Xing, Hongping He, Steven M. Reddy, Haiyang Xian   +11 more
core   +1 more source

Rare Earth Element Potential in the Araí Rift Metavolcanic, Central Brazil: Gamma‐Ray Signatures, Mineralogy and Exploration Implications

Terra Nova, EarlyView.
ABSTRACT Although central Brazil hosts significant ion‐adsorption rare earth element (REE) deposits associated with A‐type granites, their coeval volcanic counterparts have been largely overlooked as exploration targets. This study demonstrates that acidic metavolcanic rocks of the Araí Group share strong radiometric, geochemical and mineralogical ...
Yuri Ribeiro, Nilson Francisquini Botelho, Valmir da Silva Souza, Diego Guilherme da Costa Gomes   +3 more
wiley   +1 more source

Mineralogy and Provenance of Titanium-Vanadium Bearing Iron Sand Deposits from Purworejo-Kebumen, and Cilacap, Central Java

Journal of Mathematical and Fundamental Sciences
This research aimed to find out the provenance, paleo weathering, tectonic environment, sediment maturity, and economic value of beach sand deposits in two study areas.
Teuku Ishlah, Martua Raja Parningotan, Rifi Sani Nugraha, Tatik Handayani, Hariro Zahra, Ernowo Ernowo   +5 more
doaj   +3 more sources

Heavy minerals in sediments from the Mošnica Cave: Implications for the pre-Quaternary evolution of the middle-mountain allogenic karst in the Nízke Tatry Mts., Slovakia

Acta Carsologica, 2014
The cave deposits from the Mošnica Cave located on the northern slope of the Nízke Tatry Mts. were analysed by sedimentological, petrographical and mineralogical methods.
Katarína Bónová, Pavel Bella, Ján Bóna, Ján Spišiak, Martin Kováčik, Martin Kováčik, Ľubomír Petro   +6 more
doaj   +1 more source

CURRENT BEACH DEPOSITS OF THE DANUBE5DNIESTER SEGMENT OF THE BLACK SEA (LITHOLOGY AND GENESIS)

Геологія і корисні копалини Світового океану, 2022
The acumulative beach deposits of the western-north coast of the Black Sea in the area from the village of Liman (Katran spit) to the village of Carolino-Bugaz (Odesa region) have been studied.
Nesterovskyi V.A.
doaj   +1 more source