Gomez, Terry County, Texas: A New Meteorite Find

Sipiera, P. P.; Tarter, James G.; Moore, C. B.; Dod, B. D.; Johnston, Ronald A.

doi:10.1111/j.1945-5100.1980.tb00524.x

Cited by 2 publications

(1 citation statement)

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“…Besides apatite, other Clrich phases in ordinary chondrites are rarely observed, such as lawrencite and halite. Lawrencite was described in only one, unusually high-CI, L6 chondrite Gomez (Sipiera et al, 1980). Halite has been found in ordinary chondrites of intermediate petrographic grade (Zolensky et al, 1999), and if it is indeed a hydrothermal mineral, it may have formed very early.…”

Section: Implications For Ordinary Chondrite Petrogenesismentioning

confidence: 99%

Phosphate control on the thorium/uranium variations in ordinary chondrites: Improving solar system abundances

Goreva

Burnett

2001

Meteorit & Planetary Scien

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Abstract-Isotope dilution thorium and uranium analyses by inductively-coupled plasma mass spectrometry of 12 samples of Harleton (L6) show a much larger scatter than was previously observed in equilibrated ordinary chondrites. Th/U linearly correlates with 1/U in Harleton and in the total equilibrated ordinary chondrite data set as well. Such a correlation suggests a two component mixture and this trend can be quantitatively modeled as reflecting variations in the mixing ratio between two phosphate phases: chlorapatite and merrillite. The major effect is due to apatite variations, which strongly control the whole rock U concentrations. Phosphorous variations will tend to destroy the TWU vs. 1/U correlation, and measured P concentrations on exactly the same samples as U and Th show a factor of 3 range. It appears that the P variations are compensated by inverse variations in U (a dilution effect) to preserve the Th/U vs. 1/U correlation. Because variations in whole rock Th/U are consequences of phosphate sampling, a weighted average of high accuracy TWU measurements in equilibrated ordinary chondrites should converge to a significantly improved average solar system TWU. Our best estimate of this ratio is 3.53 with omem = 0.10.

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Section: Implications For Ordinary Chondrite Petrogenesismentioning

confidence: 99%