Results 71 to 80 of about 273,837 (164)

Study on the Mineralogical Characteristics of Cinnabar Jade by X-ray Powder Diffraction-Laser Raman Spectroscopy-Electron Probe from Xunyang, Shan'xi Province

Yankuang ceshi, 2014
In recent years, due to the similar appearance of Chicken-blood stone, red cinnabar jade has been a research concern of mineral composition, lithology and other related aspects in Jilin, Guizhou, Qinghai and other places.
WANG Yi, CHANG Na, LIU Ya-fei, ZHAO Hui-bo, LIU San   +4 more
doaj   +2 more sources

Fumarolic Alteration of Basalt on Mauna Ulu, Kilauea Volcano, Hawaii [PDF]

, 1983
Altered olivine tholeiite basalt on Mauna Ulu Volcano, Hawaii was examined petrographically and chemically to determine the mineralogy of the alteration products. Colour plays an important role in determining a general trend of alteration.
Mathews, Catherine
core  

metasomatic controls

, 2018
The Palaeoproterozoic Transvaal and Olifantshoek Supergroups of South Africa contain some of the earliest hematite-rich sedimentary rocks (red-beds) and paleosols on record.
George Luvizotto, David Cousins, Harilaos Tsikos, Land, Jarred S., Cousins, David, Luvizotto, G., Tsikos, Harilaos, Cousins, D., Land, J. S., Thomas Zack, Zack, Thomas, Zack, Thomas,, Jarred S. Land, Luvizotto, George [UNESP], Tsikos, H.   +14 more
core   +1 more source

Virginia Ecological Limits of Hydrologic Alteration (ELOHA): Development of Metrics of Hydrologic Alteration

, 2022
The Commonwealth of Virginia is developing a systems-based approach to integrated watershed management as outlined by the U.S. EPA’s HealthyWatersheds Initiative (HWI).
Orth, Donald J., Stringer, Shann, Leppo, Erik, Burgholzer, Robert, Gerritsen, Jeroen, Hamilton, Anna   +5 more
core  

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  

Physical properties of rocks, metasomatites, and ores at the Tunantza gold deposit, Ecuador

Известия высших учебных заведений: Геология и разведка
Background. The Cordillera del Condor in southeastern Ecuador hosts several gold deposits, including the Tunantza epithermal gold deposit and unexplored prospects.
J. P. Medina, P. A. Ignatov, A. A. Ivanov, I. V. Vikentyev   +3 more
doaj   +1 more source

Polymineral-Metasomatic Crystallogenesis

, 2009
Polymineral-Metasomatic Crystallogenesis is dedicated to the foundations of polymineral crystallogenesis in solutions typically occurring in nature. Effects, laws, and mechanisms of a metasomatic crystal replacement, joint crystal growth of different ...
Glikin, Arkady E
core   +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

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

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