Results 41 to 50 of about 53,167 (298)
Yankuang ceshi, 2018 BACKGROUND The Huize ultra-large lead-zinc deposit is a typical MVT or HZT type deposit in the lead-zinc polymetallic belt. This deposit is known as a unique metallogenic system and germanium enrichment. Due to the low mineralization temperature and lack
JIANG Xiao-jun +6 more
doaj +1 more source
Geochemistry of Kauai shield-stage lavas: Implications for the chemical evolution of the Hawaiian plume [PDF]
, 2003 We measured He, Sr, Nd, Pb, and Os isotope ratios and major and trace element concentrations in stratigraphically and paleomagnetically controlled shield-stage lavas from Kauai, Hawaii. The range of 3He/4He ratios (17–28 RA) from Kauai is similar to that
Bogue, S. W. +3 more
core +1 more source
Re‐Os isotope systematics in carbonates from Serpent Mound, Ohio: Implications for Re‐Os dating of crustal rocks and the osmium isotopic composition of Ordovician seawater [PDF]
Geochemistry, Geophysics, Geosystems, 2004 Eleven core samples of Ordovician carbonates and shale from within and nearby the Serpent Mound (Ohio) cryptoexplosion structure were analyzed for Re‐Os isotopes. Whole‐rock samples span a large range in measured 187Os/188Os (0.714 to 6.083), and exhibit a linear correlation of 187Os/188Os with 187Re/188Os.
Elisabeth Widom +2 more
openaire +1 more source
Journal of Asian Earth Sciences: X, 2019 Pelagic cherts preserved in accretionary complexes represent former seafloor sediment that can retain geochemical evidence of paleoceanographic conditions that predate the oldest extant oceanic crust.
Tatsuo Nozaki +11 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
Spin-Orbit Qubits of Rare-Earth-Metal Ions in Axially Symmetric Crystal Fields [PDF]
, 2009 Contrary to the well known spin qubits, rare-earth qubits are characterized by a strong influence of crystal field due to large spin-orbit coupling. At low temperature and in the presence of resonance microwaves, it is the magnetic moment of the crystal ...
Barbara, B. +4 more
core +2 more sources
Defining the Potential of Nanoscale Re‐Os Isotope Systematics Using Atom Probe Microscopy [PDF]
Geostandards and Geoanalytical Research, 2018 Atom probe microscopy (APM) is a relatively new in situ tool for measuring isotope fractions from nanoscale volumes (< 0.01 μm3). We calculate the theoretical detectable difference of an isotope ratio measurement result from APM using counting statistics of a hypothetical data set to be ± 4δ or 0.4% (2s).
Daly, Luke +12 more
openaire +3 more sources
The Re-Os Isotopic System: Geochemistry and Methodology at the Geochronological Research Center (CPGeo) of the University of São Paulo, Brazil [PDF]
Geologia USP. Série Científica, 2007 The Re-Os isotopic system is an important tool for the study of mantle-crust processes, geochronology and the tracingof source reservoirs for metal deposition.
Ciro Teixeira Correia +5 more
doaj
Yankuang ceshi, 2016 Quartz vein-type gold deposits of Southeastern Guizhou Province in the southwestern margin of Jiangnan Orogen, which are typical orogenic gold deposits, are hosted in Neoproterozoic Banxi Group sub-greenschist facies metamorphic rocks.
GU Shang-yi +4 more
doaj +1 more source
Measurement of 139La(p,x) cross sections from 35–60 MeV by stacked-target activation [PDF]
, 2019 A stacked-target of natural lanthanum foils (99.9119% 139La) was irradiated using a 60 MeV proton beam at the LBNL 88-Inch Cyclotron. 139La(p,x) cross sections are reported between 35–60 MeV for nine product radionuclides. The primary motivation for this
Basunia, MS +5 more
core +3 more sources