Results 51 to 60 of about 690,278 (261)

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Plagioclasites from chromite-bearing ultramafic rocks of the Rai-Iz massif

Литосфера, 2016
The corundum-bearing and without-corundum plagioclasites from chromite-bearing ultramafic rocks of Rai-Iz massif were studied. Chemical composition of the rock-forming minerals and rock geochemical characteristics was determined.
N. V. Vakhrusheva, K. S. Ivanov, A. E. Stepanov, S. P. Shokalsky, A. N. Azanov, V. V. Hiller, P. B. Shiryayev   +6 more
doaj   +2 more sources

Neoproterozoic ultramafic and mafic magmatism in the Eastern Cordillera of the central peruvian Andes: the Tapo Massif [PDF]

, 2010
A highly dismembered assemblage of ultramafic and mafic rocks is exposed in the Eastern Cordillera of the Central Peruvian Andes, extending along a discontinuous NW-SE belt over some 250 km between 12° and 9° S of latitude.
Acosta, Jorge, Castroviejo Bolibar, Ricardo, Pereira, Eurico, Rodrigues, Jose F., Tassinari, Colombo G.   +4 more
core   +2 more sources

Evolution Model for the Paleoproterozoic Talvivaara Mudstone‐Hosted Ni‐Zn‐Cu‐Co Deposit in Fennoscandia

Terra Nova, EarlyView.
ABSTRACT The Paleoproterozoic Talvivaara mudstone is a very large sulfidic Ni‐Co deposit that records enhanced organic matter accumulation during the global Shunga Event. Here, rock geochemistry and microscale S and Fe isotope composition of in situ pyrrhotites and pyrites are studied in well‐characterised, well‐preserved drill core samples.
Raimo Lahtinen, Jaakko J. Laitala, Joonas J. Virtasalo, Martin J. Whitehouse   +3 more
wiley   +1 more source

Mineral Carbonation of CO₂ in Mafic Plutonic Rocks, I—Screening Criteria and Application to a Case Study in Southwest Portugal

Applied Sciences, 2020
This article describes the screening, ranking and characterization of ultramafic and mafic rocks in southern Portugal for mineral carbonation as an alternative to conventional CO2 storage in sedimentary rocks.
Jorge Pedro, António A. Araújo, Patrícia Moita, Massimo Beltrame, Luis Lopes, António Chambel, Edgar Berrezueta, Júlio Carneiro   +7 more
doaj   +1 more source

Phase Equilibria Modeling of Low-Grade Metamorphic Martian Rocks [PDF]

, 2018
We report on modeling low-grade (up to 300 °C) metamorphic reactions with Martian starting ...
Schwenzer, S. P., Semprich, J, Treiman, A. H.   +2 more
core  

Prebiotic Organic Microstructures [PDF]

, 2011
Micro- and sub-micrometer spheres, tubules and fiber-filament soft structures have been synthesized in our experiments conducted with 3 MeV proton irradiations of a mixture of simple inorganic constituents, CO, N2 and H2O.
A Yoshihara, AM Hessler, CJ Hale, DI Foustoukos, F Klein, H Kurihara, J Takahashi, K Kobayashi, K Kobayashi, K Kobayashi, K Kobayashi, K Kvenvolden, Kensei Kobayashi, M Yoshizaki, Marie-Paule Bassez, MP Bassez, MP Bassez, O Botta, S Miyakawa, SL Seewald, T McCollom, T McCollom, Y Takano, Y Takano, Y Takano, Y Takano, Yoshinori Takano   +26 more
core   +2 more sources

The Kylmäkoski nickel-copper deposit in south-western Finland [PDF]

Bulletin of the Geological Society of Finland, 1980
The Kylmäkoski sulfide Ni-Cu deposit is located in southwestern Finland in the WNW trending Pori-Kylmäkoski nickel belt which contains several other sulfide Ni-Cu occurrences besides Kylmäkoski. The original reserves of the Kylmäkoski ore were ca.
H. Papunen
doaj   +1 more source

Ages of the Pliocene-Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications [PDF]

, 1989
The Alexandra and Ngatutura Volcanics are the two southernmost of the Pliocene-Quaternary volcanic fields of western and northern North Island, New Zealand, northwest of Taupo Volcanic Zone TVZ.
Briggs, Roger M., Itaya, T., Keane, A.J., Lowe, David J.   +3 more
core   +2 more sources

Mafic-ultramafic and quartz-rich rock indices deduced from ASTER thermal infrared data using a linear approximation to the Planck function

, 2014
ASTER thermal infrared (TIR) data are widely used to detect mafic–ultramafic rock and quartz-rich rock, and several rock indices have been proposed based on emissivity features.
Chao Ding, Xiangnan Liu, Wencan Liu, Meiling Liu, Yao Li   +4 more
semanticscholar   +1 more source