Results 91 to 100 of about 7,051 (253)

Occurrence of a skarn-type mineralogy found in Ciénaga Marbles, located in the NW foothills of the Santa Marta Massif (Colombia)

Dyna, 2016
The early Cretaceous Ciénaga Marbles that crop out in the NW foothills of the Santa Marta Massif (Colombian Caribbean region) present an epigenetic mineral assemblage (skarn-type), overprinting the metamorphic mineral assemblage previously developed ...
Oscar Mauricio Castellanos-AlarcónCarlos, Carlos Alberto Ríos-Reyes, Luis Carlos Mantilla-Figueroa   +2 more
doaj   +1 more source

Nature and origin of fluids in granulite facies metamorphism [PDF]

The various models for the nature and origin of fluids in granulite facies metamorphism were summarized. Field and petrologic evidence exists for both fluid-absent and fluid-present deep crustal metamorphism.
Newton, R. C.
core   +1 more source

Lamprophyres of the Peshchernoe gold deposit, their geological position, material composition, and metasomatic alterations (Northern Urals)

Записки Горного института
The article presents the first data on biotite-hornblende lamprophyres discovered at the Peshchernoe gold deposit. We consider the geological position of lamprophyre dikes in the deposit structure and the relationship of these rocks with tectonically ...
Dmitrii V. Kuznetsov, Sergei Yu. Stepanov, Andrei V. Butnyakov, Viktoriya S. Igosheva   +3 more
doaj  

The Compositional Evolution of the Phyllosilicates in the Lateritic Profile of the Catalão I Ultramafic Alkaline-carbonatitic Complex (GO) [PDF]

Geologia USP. Série Científica, 2010
The compositional evolution of the phyllosilicates in the lateritic profile of the Catalão I ultramafic alkaline-carbonatiticcomplex (GO) is proposed in this work based on petrographic and X-ray diffraction analysis, as well as, chemical ...
Rogério Guitarrari Azzone, Excelso Ruberti   +1 more
doaj  

Genetic concepts on the formation of the Austrian magnesite and siderite mineralizations in the Eastern Alps of Austria

Geologia Croatica, 2016
A consanguineous origin of the sparry siderite and magnesite mineralizations of the Eastern Alps has been repeatedly discussed in the past, often without the back-up of sound scientificarguments.
Walter Prochaska
doaj   +1 more source

Phosphate sequence study of Boqueirâo pegmatite (Rio Grande Do Norte State, Brazil) [PDF]

, 2015
The Boqueirão pegmatite is located in the Borborema Pegmatite Province in the state of Rio Grande do Norte (NE Brazil) hosted by Neoproterozoic taconglomerates of Equador Formation.
Amores Casals, Sandra, Brito Barreto, Sandra de, Espallargas, Ruben, Fontan, François, Melgarejo i Draper, Joan-Carles   +4 more
core  

Exotic accessory minerals in layered chromitites of the Campo Formoso complex (Brazil) [PDF]

, 2006
The Campo Formoso stratiform intrusive complex, in Bahia State, Brazil, considered to be of Paleoproterozoic age, consists of a tabular body of ultramafic rocks about 40 km long and 100-1100 m wide.
Garuti, G., Instituto Andaluz de Ciencias de la Tierra, Martin, R. F., Zaccarini, F.   +3 more
core   +2 more sources

Detection of mineralogical and lithological transitions in igneous Intrusion-Limestone boundaries using close-range hyperspectral remote Sensing: A resource perspective

International Journal of Applied Earth Observations and Geoinformation
This study presents an innovative solution for detecting complex geological formations, particularly in areas where field surveys are difficult or impossible.
Huy Hoa Huynh, Jaehyung Yu, Lei Wang, Trung Hieu Pham, Jin-Young Lee   +4 more
doaj   +1 more source

Dynamic Permeability Related to Greisenization Reactions in Sn-W Ore Deposits: Quantitative Petrophysical and Experimental Evidence

Geofluids, 2019
Massive greisens are commonly associated with Sn-W mineralization and constitute low-grade high-tonnage deposits. The formation of this type of deposit results from an intense pervasive metasomatic alteration involving a major fluid and mass transfer ...
Gaëtan Launay, Stanislas Sizaret, Laurent Guillou-Frottier, Colin Fauguerolles, Rémi Champallier, Eric Gloaguen   +5 more
doaj   +1 more source

Geological structure and perspectives for mineralization of the Kichany structure, Tiksheozersky greenstone belt (Northern Karelia)

Литосфера, 2017
Mineral deposits in the Neoarchean greenstone belts in the Fennoscandian Shield, especially in its eastern (Russian) part, are not as numerous as in Archean belts of Canada, Australia, or Southern Africa.
A. Kalinin Arkady, Yu. Astaf’ev Boris, A. Voinova Ol′ga, B. Bayanova Tamara, V. Khiller Vera   +4 more
doaj   +1 more source