Results 31 to 40 of about 99,443 (295)
Is the Mesolithic-Neolithic Subsistence Dichotomy Real? New Stable Isotope Evidence from the Danube Gorges [PDF]
, 2004 The article presents new results of stable isotope analyses made on animal and human bones from the Mesolithic-early Neolithic sites of Lepenski Vir and Vlasac in the Danube Gorges of the Balkans.
Borić, Dušan +3 more
core +1 more source
Yankuang ceshi, 2016 Re-Os isotope method is a powerful tool for dating ore deposits, but digesting samples with the Carius tube is complicated and dangerous.A simple and quick method to determine the age of molybdenite Re-Os and Re content has been established.5-15 mg of ...
YANG Xue +5 more
doaj +1 more source
Morozkinskoye gold deposit (southern Yakutia): age and ore sources
Записки Горного института, 2021 The paper presents the results of the comprehensive isotope geochemical (Re-Os, Pb and δ34S) study of sulfide mineralization of the Morozkinskoye deposit. The ore zones of the deposit are localized in the syenite massif of Mount Rudnaya, which is located
Vladislav E. Guzev +3 more
doaj +1 more source
Basinal restriction, black shales, Re‐Os dating, and the Early Toarcian (Jurassic) oceanic anoxic event [PDF]
Paleoceanography, 2008 Profiles of Mo/total organic carbon (TOC) through the Lower Toarcian black shales of the Cleveland Basin, Yorkshire, United Kingdom, and the Posidonia shale of Germany and Switzerland reveal water mass restriction during the interval from late tenuicostatum Zone times to early bifrons Zone times, times which include that of the putative Early Toarcian ...
McArthur, JM +4 more
openaire +3 more sources
Insights on the changing dynamics of cemetery use in the neolithic and chalcolithic of southern Portugal. Radiocarbon dating of Lugar do Canto Cave (Santarém) [PDF]
, 2014 Lugar do Canto Cave is one of the most relevant Neolithic burial caves in Portugal given not only its extraordinary preservation conditions at the time of discovery but also the quality of the field record obtained during excavation. Its material culture
Carvalho, António, Luis Cardoso, Joao
core +4 more sources
Yankuang ceshi, 2017 The Shapoling Mo deposit is located in the Xiong'er rock mass of the southern margin of the North China Craton. The deposit is hosted in a contact zone between granite and wallrocks of the Taihua Soupergroup, which is a recently found discovered vein ...
YUE Su-wei +3 more
doaj +1 more source
Re/Os constraint on the time-variability of the fine-structure constant
, 2003 We argue that the accuracy by which the isochron parameters of the decay $^{187}{\rm Re}\to ^{187}{\rm Os}$ are determined by dating iron meteorites may not directly constrain the possible time-dependence of the decay rate and hence of the fine-structure
A. I. Shlyakhter +8 more
core +1 more source
The way to overcome the difficulty in Re-Os dating of molybdenite.
Proceedings of the Japan Academy, Series B, 1990 When a molybdenite was dissolved and treated by the conventional chemical procedure, it was difficult to achieve the isotopic equilibrium between the 187Os radiogenically accumulated in the molybdenite and“common”Os added as a kind of internal standard, even after chemically complete decomposition. It is evident that this isotopic disequilibrium effect
Katsuhiko SUZUKI, Akimasa MASUDA
openaire +2 more sources
alpha :a constant that is not a constant? [PDF]
, 2002 We review the observational information on the constancy of the fine structure constant alpha. We find that small improvements on the measurement of ^{187}Re lifetime can provide significant progress in exploring the range of variability suggested by QSO
Fiorentini, G., Ricci, B.
core +2 more sources
Yankuang ceshi, 2014 The Kuimeishan tungsten deposit is located in the junction area of the eastern segment of the E-W-trending Nanling tectonic zone and southern segment of the NE-NNE trending Wuyishan tectonic zone.
LI Li-xia +7 more
doaj +2 more sources