Results 51 to 60 of about 982 (167)
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
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
Phanerozoic veins of galena in the Åland rapakivi area, southwestern Finland [PDF]
Bulletin of the Geological Society of Finland, 1979 Some minor galena mineralizations are in part associated with clastic dykes of Cambrian sandstone in the Aland rapakivi area. Galena also occurs disseminated in greisen-type mineralizations.
L. Bergman, B. Lindberg
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
Tectonic setting and origin of the Proterozoic rapakivi granites of southeastern Fennoscandia
, 1992 The 1·65–1·54 Ga rapakivi granites of southeastern Fennoscandia represent the silicic members of a bimodal magmatic association in which the mafic members are tholeiitic diabase dykes and minor gabbroic-anorthositic bodies.
Ilmari Haapala, O. Tapani Rämö
core +1 more source
, 1992 Early Proterozoic rapakivi intrusions in S Greenland occur as thick sheets which have ramp–flat geometry and were intruded along the median planes of active ductile extensional shear zones.
D. H. W. Hutton +3 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
, 2007 The Rio Branco Rapakivi Batholith belongs to the Cachoeirinha Tectonic Domain, part of the Rio Negro-Juruena Geochronological Province located on the southwestern portion of the Amazonian Craton in Mato Grosso, Central Brasil.
Godoy, Antonio Misson [UNESP] +7 more
core +1 more source
Changes of Granite Rapakivi under the Biofouling Influence
, 2021 Interdisciplinary study of granite rapakivi biofouling in the natural and anthropogenic environment (St. Petersburg, Vyborg, Southern Finland) was carried out. The biodiversity of microorganisms (cyanobacteria, micromycetes, and organotrophic bacteria) and various types of biofilms are characterized.
Dmitry Yu. Vlasov +5 more
openaire +2 more sources
Geochemical characterization of Gubanovskaya intrusion of rapakivi granites (Wiborg massif)
Vestnik MGTUThe paper presents new data on geology and composition of rapakivi granites of Gubanovskaya intrusion (Wiborg massif). Petrographic and geochemical characteristics of rapakivi granites of the second (ovoid) and third (trachytoid) phases of intrusion, as ...
Rogova I. V. +3 more
doaj +1 more source