TīmeklisIt is composed of six main rock types: (1) anorthosite-gabbronorite-gabbro association, (2) monzonite-quartz syenite-syenite association, (3) biotite-amphibole syenogranite (Uljalegi pluton), (4) amphibole-biotite rapakivi granites (wiborgite and pyterlite), (5) biotite granite, and (6) topaz-bearing albite-lithian sideophyllite … TīmeklisRapakivi texture occurs worldwide in silicic rocks of many ages and has been attributed to various igneous and metamorphic processes. The O’Leary Porphyry contains both …
Rapakivi texture formation via disequilibrium melting in a contact ...
TīmeklisAll worldwide known rare occurrences of Phanerozoic A-type granites with typical rapakivi texture do not usually have any significant volume of contemporaneous basic rocks in magmatic association... Tīmeklis1,430 (2024) 22.5km NE. An occurrence (s) located on Mount Scott and area. A-type sheet rapakivi granite in the Wichita Mountains. The Rapakivi texture is due to depressurization of a H2O-undersaturated magma during its ascent from a temporary crustal magma trap (7-8 kilometers) to emplacement along a magma trap beneath a … healthy tuna recipes for lunch
Hornfelsic textures SpringerLink
TīmeklisA new hypothesis is formulated to explain the development of rapakivi texture in and around the mafic enclaves of porphyritic granitoids, i.e. in environments involving magma mixing and mingling. The formation of a plagioclase mantle around alkali feldspar megacrysts is attributed to the localized presence of a melt resulting from … TīmeklisThe melt zone can be traced in full, from high degrees of melting (>60%) along the dolerite contact, to no apparent signs of melting, 10s of meters above the contact. … TīmeklisWiley Online Library Scientific research articles, journals, books ... moulsecoomb church