The early Proterozoic Saari-Kiekki greenstone belt: A representative of the Sariola Group at Kuhmo, Eastern Finland [PDF]
The early Proterozoic Saari-Kiekki greenstone belt in Kuhmo, eastern Finland, is the deformed remnant of a NW‒SE-trending elongate structural basin c. 15 km long and up to 3 km wide.
E.J. Luukkonen
doaj +1 more source
Relationships between sanukitoids and crust-derived melts and their implications for the diversity of Neoarchaean granitoids: A case study from Surmansuo and nearby areas, Eastern Finland [PDF]
We present new isotopic data (U-Pb and Sm-Nd) from the Neoarchean granitoids of the Lentua complex, which is a part of the Western Karelia subprovince of the Fennoscandian Shield.
P. Mikkola, E. Heilimo, H. Huhma
doaj +1 more source
Age Dating Stellar Populations in the Near Infrared: An absolute age indicator from the presence/absence of red supergiants [PDF]
The determination of age is a critical component in the study of a population of stellar clusters. In this letter we present a new absolute age indicator for young massive star clusters based on J-H colour.
Adamo, A. +6 more
core +3 more sources
Rb-Sr whole-rock isotopic study of late Archaean and early Proterozoic granitoid intrusions, Kainuu, Eastern Finland [PDF]
A tonalite-granodiorite-granite suite emplaced during the late Archaean D3 deformational phase yields a six point isochron age of 2,500 ± 270 Ma and an initial 87Sr/86Sr of 0.7044 ±0.0018.
A.N. Halliday +2 more
doaj +1 more source
A minimum age of the universe can be estimated directly by determining the age of the oldest objects in the our Galaxy. These objects are the metal-poor stars in the halo of the Milky Way.
Chaboyer, Brian
core +3 more sources
Timing of Svecofennian crustal growth and collisional tectonics in Åland, SW Finland [PDF]
In an effort to quantify the time parameter in the tectonomagmatic evolution of what has been called the Southern Svecofennian Arc Complex (SSAC) of SW Finland, advanced radiometric dating techniques have here been applied to rock groups of key ...
C. Ehlers, T. Skiöld, M. Vaasjoki
doaj +1 more source
Mid- and late-Holocene shoreline changes along the southern coast of the Gulf of Finland [PDF]
In response to glacio-isostatic rebound in Estonia, a relative sea level fall occurred during the mid- and late-Holocene, and as a result, lowland regions in northern Estonia have experienced an evolution from sea to land.
I. Grudzinska +3 more
doaj +1 more source
Determining the sequence of events in the formation of stars and planetary systems and their time-scales is essential for understanding those processes, yet establishing ages is fundamentally difficult because we lack direct indicators. In this review we
Hillenbrand, Lynne A. +4 more
core +2 more sources
A note on a thermokarst feature on the North Slope of Alaska [PDF]
A thermokarst depression with active thermal erosion on one margin and a drainage way to the Sagavanirktok River is described with the aid of a sketch plan and sections.
R.G. West, J.J. Donner, T. Kankainen
doaj +1 more source
The absolute age of the globular cluster M15 using near-infrared adaptive optics images from PISCES/LBT [PDF]
We present deep near-infrared (NIR) J, Ks photometry of the old, metal-poor Galactic globular cluster M\,15 obtained with images collected with the LUCI1 and PISCES cameras available at the Large Binocular Telescope (LBT).
Arcidiacono, C. +28 more
core +3 more sources

