U-Pb zircon geochronology of selected Archaean migmatites in eastern Finland [PDF]
Bulletin of the Geological Society of Finland, 2007 U-Pb SIMS data on eight samples (four mesosome-leucosome pairs) from migmatites in gneiss complexes are presented from the western part of the Archaean Karelian craton, eastern Finland. Most zircon grains in the mesosomes yield ages between 2.84 Ga and 2.
A. Käpyaho +2 more
doaj +1 more source
New Near-Infrared Surface Brightness Fluctuation Models
, 2005 We present new theoretical models for surface brightness fluctuations in the near-infrared. We show the time evolution of near-infrared brightness fluctuation properties over large age and metallicity ranges, i.e., from 12 Myr to 16 Gyr, and from Z/Zsun ...
Alvarez +62 more
core +2 more sources
Age and isotopic fingerprints of some plutonic rocks in the Wiborg rapakivi granite batholith with special reference to the dark wiborgite of the Ristisaari Island [PDF]
Bulletin of the Geological Society of Finland, 2014 The mid-Proterozoic, locus classicus Wiborg rapakivi granite batholith of southeastern Finland and adjacent Russia comprises a varying, bimodal (silicic-basic) sequence of plutonic, subvolcanic, and volcanic rocks. At the current level of erosion silicic
O.T. Rämö +5 more
doaj +1 more source
Temporal and Hf isotope geochemical evolution of southern Finnish Lapland from 2.77 Ga to 1.76 Ga [PDF]
Bulletin of the Geological Society of Finland, 2012 The southern Finnish Lapland area in the central part of the Fennoscandian shield is a geologically complex zone comprising several Archean blocks and Paleoproterozoic supracrustal belts all of which are intruded by voluminous Paleoproterozoic granites ...
L.S. Lauri +3 more
doaj +1 more source
‘Absolute’ Age: a Meaningless Term [PDF]
Nature, 1962 I WISH to appeal to my fellow geologists and workers in the rapidly growing subject of geochronology to discontinue a habit or fashion which is both unnecessary and misleading. I refer to the habit of calling radiometric ages ‘absolute’ ages. An age does not become ‘absolute’ by virtue of being expressed in units of time such as a year.
openaire +1 more source
The Absolute Magnitudes of Red Horizontal Branch Stars in the ugriz System
, 2009 Based on photometric data of the central parts of eight globular clusters and one open cluster presented by An and his collaborators, we select red horizontal branch (RHB) stars in the (g-r)0-g0 diagram and make a statistical study of the distributions ...
An +14 more
core +1 more source
The Accuracy of Age Estimation Using Transition Analysis in the Hamann-Todd Collection [PDF]
, 2020 Trying to reconstruct the demographic parameters of past populations using skeletal data is challenging for several reasons. First, skeletal traits are proxy to biological age, which does not always reflect chronological age.
Simon, Allyson
core
Brain Age from the Electroencephalogram of Sleep [PDF]
, 2018 The human electroencephalogram (EEG) of sleep undergoes profound changes with age. These changes can be conceptualized as "brain age", which can be compared to an age norm to reflect the deviation from normal aging process.
Akeju, Oluwaseun +10 more
core +3 more sources
A pilot Rb-Sr dating of the Suomusjärvi ultramylonite: evidence for major post-Svecofennian deformation in SW Finland [PDF]
Bulletin of the Geological Society of Finland, 1991 The Suomusjärvi shear zone in the West Uusimaa area in the Proterozoic Svecofennides of SW Finland belongs to a group of late, post-peak metamorphic structures comprising vertical shear zones and folds with vertical fold axes.
M. Ploegsma
doaj +1 more source
Auditory and cognitive performance in elderly musicians and nonmusicians [PDF]
, 2017 Musicians represent a model for examining brain and behavioral plasticity in terms of cognitive and auditory profile, but few studies have investigated whether elderly musicians have better auditory and cognitive abilities than nonmusicians.
Borella, Erika +3 more
core +2 more sources