Results 51 to 60 of about 759 (173)
Rapakivi granites, S Greenland: hydrothermal alteration of igneous layering [PDF]
, 1990 Igneous layering is developed in the Proterozoic rapakivi granite suite of South Greenland in an area on the south-easternmost coast of the island of Angnikitsoq. The layering at this locality is unusual in that it is defined by interstitial phases.
Harrison, TN +7 more
core +1 more source
Geophysical Research Letters, Volume 51, Issue 18, 28 September 2024.Abstract The Chuanlinggou Formation in the northern North China preserves the world's earliest multicellular eukaryote microfossils. Here we present a high‐precision zircon U–Pb CA–ID–TIMS age of 1,641.7 ± 1.2 Ma for a tuff layer within the black shales of the Chuanlinggou Formation.
Shuan‐Hong Zhang +6 more
wiley +1 more source
Genèse d'un granite Rapakivi par transformation de grès arkosiens Lavras : Rio Grande do Sul, Brésil [PDF]
, 1962 Goñi Juan C. Genèse d'un granite Rapakivi par transformation de grès arkosiens Lavras : Rio Grande do Sul, Brésil. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 85, 1, 1962. pp.
Goñi, Juan
core +1 more source
Remanent magnetization of two intrusive bodies in southeastern Finland [PDF]
Bulletin of the Geological Society of Finland, 1978 Direction of natural remanent magnetization (NRM) was measured for a diabase from the intrusive contact of rapakivi granite (1650 Ma) and for a granodiorite intrusion (1810 Ma).
K.J. Neuvonen
doaj +1 more source
Geoheritage Meaning of Artificial Objects: Reporting Two New Examples from Russia
Heritage, 2021 Geoheritage is not necessarily linked genetically to “purely” geological processes. Investigations in two urban areas of Russia allowed us to find essentially artificial objects demonstrating certain geological uniqueness.
Anna V. Mikhailenko +2 more
doaj +1 more source
Formation of Rapakivi Textures in Granite of the Deer Isle Pluton, Maine [PDF]
, 2007 Ovoid K-feldspar mantled by Na-feldspar is called rapakivi. Rapakivi may form either by (1) decompression during ascent of felsic magma through the crust to a shallow magma chamber or by (2) mixing of mafic- and felsic-magma within a magma chamber.
Kaiser, Jason
core +1 more source
Геофизический журнал, 2014 Strain-deformed state of the earth’s crust of northwestern and central parts of the Ukrainian Shield while jointing the terrains of Fennoscandia and Sarmatia and forming of the Korosten and the Korsun-Novomirgorod plutons of gabbro-anorthosites and ...
O.B. Gintov, S. V. Mychak
doaj +1 more source
Вісник Київського національного університету імені Тараса Шевченка. Серія Геологія, 2018 Preliminary geochemical dataset for the granitoids (rapakivi, granite-porphyries, veined granites) of Korosten anorthosite-rapakivi granite pluton (Ukrainian Shield) was studied. The data set includes the results of all major and selected trace elements
S. Shnyukov +5 more
doaj +1 more source
Rapakivi granite in St. Petersburg: architecture and mineralogical-petrografical observations [PDF]
, 2016 Rapakivi granites are a widely used in architectural ensembles of St. Petersburg. The history and examples of their application from 1760s are here reviewed.
Bulakh, Andrey G. +2 more
core +1 more source
Triplite and wolframite from a greisen-bordered veinlet in Eurajoki, SW Finland [PDF]
Bulletin of the Geological Society of Finland, 1969 Triplite and wolframite are described from a greisen-bordered veinlet associated with the local varieties of the Laitila rapakivi granite massif. The chemical analysis, unit cell dimensions and specific gravity are given for these minerals, and in ...
I. Haapala, P. Ojanperä
doaj +1 more source