rhenium osmium ntims

Abundances and isotopic compositions of rhenium and osmium ...

Rhenium and osmium isotopes of molybdenites from the Daheishan deposit were used to determine the age of mineralization. Rhenium concentrations in molybdenite samples are between 17 and 30μg g−1.

ISOTOPIC ANALYSIS OF OSMIUM, RHENIUM AND IRIDIUM BY …

0s by NTIMS is a factor of 10-20 better for equivalent analysis quantities, and the ionization efficiency is improved by lo2 - 105. The detection limit for 0s by NTIMS is estimated to be below 10-14g. For Re and Ir, isotopic compositions have been determined by NTIMS with a precision of + 0.3%0.

Osmium Isotope - an overview | ScienceDirect Topics

For the NTIMS measurements, rhenium and osmium fractions are loaded (separately) on filaments (commonly Pt) that have to be cleaned to remove any rhenium background, and are measured as negative ReO 4 − and OsO 3 − ions, respectively. Measurements can also be done by ICP-MS.

Debra C. Colodner, Edward A. Boyle, and John M. Edmond ...

times background) of approximately 5 pg of Re, 6 pg of Ir, and 14 pg of Pt. INTRODUCTION Rhenium, iridium, and platinum occur in trace concen- trations in most earth-surface materials. The ability to determine these elements at natural levels is important for geochemical prospecting,' environmental monitoring,Z and

Osmium - Wikipedia

Osmium (from Greek ὀσμή, osme, 'smell') is a chemical element with the symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with an experimentally measured (using x-ray crystallography) density of 22.65 g/cm 3.

Abundances and isotopic compositions of rhenium and osmium ...

Mar 21, 2007· Mar 21, 2007· Two pyrite samples from the Shihezi Formation (Lower Permian), Huaibei coalfield, Anhui, China, have been analyzed for abundances and isotopic compositions of rhenium and osmium using negative thermal ion mass spectrometry. The Re–Os ages of the pyrites are 64.4 and 226 Ma, which are younger than the formation age of the coal seam. The pyrite samples may consist …

PHYSICAL FOUNDATIONS OF RHENIUM-OSMIUM METHOD – …

be adapted to determine rhenium and osmium isotope concentrations using negative thermal ioniza-tion mass spectrometry (NTIMS). We describe the principle of the Re-Os dating technique and the thermal ionization phenomena which lead to high precision isotope analysis on NTIMS.

Osmium Isotope - an overview | ScienceDirect Topics

For the NTIMS measurements, rhenium and osmium fractions are loaded (separately) on filaments (commonly platinum) that have to be cleaned to remove any rhenium background and are measured as negative ReO 4 − and OsO 3 − ions, respectively. Measurements can also be done by ICP-MS.

Physical Foundations of Rhenium-Osmium Method - A Review ...

Jul 01, 2007· Physical Foundations of Rhenium-Osmium Method - A Review A newly acquired mass spectrometer MI 1201 by the Mass Spectrometry Laboratory will be adapted to determine rhenium and osmium isotope concentrations using negative thermal ionization mass spectrometry (NTIMS). We describe the principle of the Re-Os dating technique and the thermal ionization phenomena which …

(PDF) Physical Foundations of Rhenium-Osmium Method-A Review

be adapted to determine rhenium and osmium isot ope concentrations using negative thermal ioniza- tion mass spectrometry (NTIMS). We describe the principle of the Re-Os dating technique and the

Rare-earth element - Wikipedia

As seen in the chart to the right, rare-earth elements are found on earth at similar concentrations to many common transition metals. The most abundant rare-earth element is cerium, which is actually the 25th most abundant element in Earth's crust, having 68 parts per million (about as common as copper).The exception is the highly unstable and radioactive promethium "rare earth" is quite scarce.

Abundances and isotopic compositions of rhenium and osmium ...

Two pyrite samples from the Shihezi Formation (Lower Permian), Huaibei coalfield, Anhui, China, have been analyzed for abundances and isotopic compositions of rhenium and osmium using negative thermal ion mass spectrometry. The Re–Os ages of the

ISOTOPIC ANALYSIS OF OSMIUM, RHENIUM AND IRIDIUM …

0s by NTIMS is a factor of 10-20 better for equivalent analysis quantities, and the ionization efficiency is improved by lo2 - 105. The detection limit for 0s by NTIMS is estimated to be below 10-14g. For Re and Ir, isotopic compositions have been determined by NTIMS with a precision of + 0.3%0.

Scientists Discover That 40 Percent of the World's Gold is ...

Sep 10, 2002· Sep 10, 2002· Gold and other minerals contain a rare metallic chemical element called rhenium. Rhenium-187 is the radioactive form of the element. NTIMS directly dates minerals by counting the number of their rhenium-187 and osmium-187 atoms. Rhenium-187 has a half -life of 45 billion years, or about 10 times the age of our solar system. It decays into ...

PHYSICAL FOUNDATIONS OF RHENIUM-OSMIUM METHOD …

be adapted to determine rhenium and osmium isotope concentrations using negative thermal ioniza-tion mass spectrometry (NTIMS). We describe the principle of the Re-Os dating technique and the thermal ionization phenomena which lead to high precision isotope analysis on NTIMS.

Rhenium-osmium systematics of orogenic gold deposits ...

Rhenium-osmium ages of some gold and related minerals are consistent with existing geochronology and in some cases better constrain genetic models of mineralization. The initial Os isotopic composition is also preserved within some ore minerals and reflects the importance of both crustal and mantle material in the generation

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