Carbon Dating Meteorites

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PDF Carbon-14 Dating of Antarctic Meteorites and Antarctic Ice,
Radioisotope Dating Meteorites: Carbonaceous Chondrite . . .
Radioisotope Dating Meteorites: Isochron Ages | Answers . . .
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Methods of Dating the Age of Meteorites
PDF Carbon in Meteorites
Carbon-14 activities in recently fallen meteorites and . . .
Carbon in the Metal of Iron Meteorites - NASA/ADS
The meteorite EC002 was analysed for Mg/Al isotopes was . . .
It's Official: Radioactive Isotope Dating Is Fallible . . .
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CARBON -14 DATING OF ANTARCTIC METEORITES AND ANTARCTIC ICE, E . L . Fireman, Smithsonian Astrophysical Observatory, 60 Garden St ., Cambridge, MA 02138 Carbon -14 is observed in the achondrite ALHA 77256, the activity is 17 .7 5 2 .0 @m/kg . The ALHA 77256 sample was fresh material chipped from the interior of a
They appear to consistently yield 4 .56-4 .57 Ga radioisotope ages, adding to the uniformitarians' confidence in the radioisotope dating methods . The Allende CV3 carbonaceous chondrite meteorite , which fell to earth in Mexico February 8, 1969, is one of the most-studied meteorites .
In order to rectify this lack of engagement by the creationist community with the meteorite radioisotope dating data, Snelling (2014a) obtained as much radioisotope dating data as possible for the Allende CV3 carbonaceous chondrite meteorite (due to its claimed status as the most studied meteorite ), displayed the data, and attempted to analyze them .
"Our findings are important because it is the first time anybody explained these carbon -rich molecules found in meteorites . They are similar to the molecules that make-up living things," said Max Bernstein, a space scientist at NASA Ames . As it happened, their findings were judged significant enough to be award-winning .
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The use of 14C in meteorite dating is solely based on its production by cosmic rays (and for terrestrial samples, with its production in the atmosphere) . 26Al and some other nuclides not mentioned are also used in this way . Thus, although "extinct", these nuclides are present in meteorites , but produced by a more recent process .
Carbon in Ureilites •Oddly, the most carbon -rich meteorites are Ureilites •They are carbonaceous olivine-pyroxene achondrites . Contain up to 7 wt .% carbon as graphite, diamond, and lonsdaleite . •The carbon is entirely in the matrix between the olivine and pyroxene grains •They are believed to represent mantle residues
A range of values between 35 and 59 dpm/kg was found for other falls of saturated meteorites preheated to 500°C . The preheating step is shown to be effective in removing terrestrial carbon contamination . A series of samples previously dated by 81 Kr as having ages of 120-310 kyrgave 14 C levels of
Carbon in the Metal of Iron Meteorites . Magmatic iron meteorites (e .g ., group IIIAB) are believed to represent the slowly cooled cores of asteroidal-sized bodies . Concentration gradients of Ni in taenite (gamma-alloy) adjacent to kamacite (alpha-alloy) have been studied extensively following the early work of Wood and Goldstein and Ogilvie, and . . .
Okay, so this (26 Al-26 Mg) is not a common system, outside of meteorite applications, and it doesn't work like a lot of other radiometric dating techniques . This actually relies on a relatively short half life system, specifically, 26 Al decays to 26 Mg with a half life of ~0 .73 million years .
And this dovetails with other valid research which has unearthed enough other data to call into question the assumed reliability of isotope clock dating systems . References . Brennecka, G . A . et al . 238 U/ 235 U Variations in Meteorites : Extant 247 Cm and Implications for Pb-Pb Dating . Science Express . Published online December 31, 2009 .
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Carbon Dating Meteorites

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