Results 51 to 60 of about 2,536 (164)

Geoheritage Meaning of Artificial Objects: Reporting Two New Examples from Russia

open access: yesHeritage, 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

First High‐Precision U–Pb CA–ID–TIMS Age of the Chuanlinggou Formation, North China Craton: Implications for Global Correlations of Black Shales and the Statherian/Calymmian Boundary

open access: yesGeophysical 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

Stenian A-type granitoids in the Namaqua-Natal Belt, southern Africa, Maud Belt, Antarctica and Nampula Terrane, Mozambique: Rodinia and Gondwana amalgamation implications [PDF]

open access: yes, 2019
journal ...
Arima, Makoto   +8 more
core   +2 more sources

3-D density model of the crust of southern and central Finland obtained from joint interpretation of the SVEKALAPKO crustal P-wave velocity models and gravity data [PDF]

open access: yes, 2004
Peer ...
Elo, S.   +5 more
core   +1 more source

Isotopic evidence for the origin of Proterozoic massif-type anorthosites and their relation to rapakivi granites in southern Finland and northern Brazil [PDF]

open access: yes, 2012
The purpose of this study was to apply novel isotopic methods to shed light on the petrogenesis and magmatic evolution of Proterozoic massif-type anorthosites and related rapakivi granites in southern Finland and northern Brazil.
Heinonen, Aku
core  

Phanerozoic veins of galena in the Åland rapakivi area, southwestern Finland [PDF]

open access: yesBulletin 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

Earth's middle age [PDF]

open access: yes, 2014
This research was funded through Natural Environment Research Council (grant NE/J021822/1) and the APC was paid through the RCUK OA block grant.Earth's middle age, extending from 1.7 to 0.75 Ga, was characterized by environmental, evolutionary, and ...
Cawood, Peter Anthony   +1 more
core   +1 more source

Kinematics of formation of the Ukrainian Shield during the period 1,80-1,73 Ga ago according to the results of studies of rock fracturing of the Korosten and Korsun-Novomirgorod plutons

open access: yesГеофизический 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

Magmatic evolution of topaz-bearing granite stocks within the Wiborg rapakivi granite batholith [PDF]

open access: yes, 2007
This study brings new insights into the magmatic evolution of natural F-enriched peraluminous granitic systems. The Artjärvi, Sääskjärvi and Kymi granite stocks within the 1.64 Ga Wiborg rapakivi granite batholith have been investigated by petrographic ...
Lukkari, Sari
core  

Triplite and wolframite from a greisen-bordered veinlet in Eurajoki, SW Finland [PDF]

open access: yesBulletin 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

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