Results 71 to 80 of about 29,586 (208)
Coesite Discovery in Eclogites Confirms UHP Metamorphism in the Orlica‐Śnieżnik Dome (SW Poland)
Journal of Metamorphic Geology, Volume 44, Issue 3, Page 200-225, April 2026.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 +4 more
wiley +1 more source
Crystal-chemistry and short-range order of fluoro-edenite and fluoro-pargasite: a combined x-ray diffraction and ftir spectroscopic approach [PDF]
, 2013 In this study we address the crystal-chemistry of a set of five samples of F-rich amphiboles from the Franklin marble (USA), using a combination of microchemical (EMPA), SREF, and FTIR spectroscopy methods. The EMPA data show that three samples fall into
Bellatreccia, Fabio +3 more
core +3 more sources
Sedimentology, Volume 73, Issue 3, Page 706-741, April 2026.ABSTRACT Understanding the biotic and abiotic influences on the deposition and diagenesis of recent microbial carbonates is crucial for addressing the environmental and ecological significance of ancient organosedimentary structures. This study investigates these factors and their expression in the microstructure of Holocene tufa thrombolites from a ...
Paulo Quezada +10 more
wiley +1 more source
The Capability of Amphibole in Tracing the Physicochemical Processes of Magma Mixing
Geophysical Research LettersThis study explores the capability of amphibole in tracing the physicochemical process of magma mixing through spatially associated gabbros, mafic microgranular enclaves (MMEs) and granodiorites from central Tibet.
Mingjian Li +6 more
doaj +1 more source
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 +4 more
core +2 more sources
Metamorphic and metasomatic evolution of the Western Domain of the Karagwe-Ankole Belt (Central Africa) [PDF]
, 2020 The tectonometamorphic evolution of the Western Domain of the Karagwe-Ankole Belt, containing widespread granite-related W-Nb-Ta-Sn mineralization in pegmatites and hydrothermal quartz veins of Early Neoproterozoic age, is largely unknown.
Dewaele, Stijn +3 more
core +1 more source
The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)
Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti +5 more
wiley +1 more source
Earth Surface Processes and Landforms, Volume 51, Issue 3, March 2026.Eighteen boreholes in Colombia's Tropical Andes reveal elevation‐controlled Critical Zone architecture. Four‐layer weathering profiles with thick saprolite (≤48 m) form at high elevations (>1,100 m) where dense fracturing enhances permeability. Low‐elevation boreholes lack saprolite despite high fracture density, demonstrating fracturing's dual role as
Helbert Garcia‐Delgado +2 more
wiley +1 more source
Kôzulite, an Mn-rich alkali amphibole
Acta Crystallographica Section E, 2010 The crystal structure of kôzulite, an Mn-rich alkali amphibole with the ideal formula NaNa2[Mn42+(Fe3+,Al)]Si8O22(OH)2, trisodium tetramanganese iron/aluminium octasilicate dihydroxide, was refined from a natural specimen with composition (K0 ...
Madison C. Barkley +2 more
doaj +1 more source