Showing papers by "John Bridges published in 2005"
TL;DR: In this paper, I-Xe analyses of ten chondrules from Chainpur LL3.4 were presented, giving a range of ages from 0.5 Ma before shallow waters to 17.8 after shallow waters.
17 citations
01 Dec 2005
TL;DR: In this paper, it was shown that most chondrules formed by impacts on differentiated bodies, contemporaneous with igneous activity and aqueous and thermal metamorphism, and that the major element contents of chondrite groups were volatility controlled and established in a nebula after formation of Ca-Al-rich inclusions.
Abstract: Major element contents of chondrite groups were volatility controlled and established in a nebula after formation of Ca-Al-rich inclusions but before chondrules formed. Elemental abundances in chondrules tend to correlate with chemical affinity. Calcium was fractionated from Al by a planetary, not a nebular process. Chondrules were contemporaneous with igneous activity and aqueous and thermal metamorphism. Planetary bodies of varied size and structure co-existed during the first 50-80 million years of the Solar System, when chondrules formed and impact was common. We propose that most chondrules formed by impacts on differentiated bodies.
15 citations
01 Mar 2005
TL;DR: Nakhla and Lafayette delta 7Li values for samples and extracts (41-142i?½) are consistent with brine evaporation Relatively 13C-poor siderite in Lafayette suggests more than one carbon source was sampled as mentioned in this paper.
Abstract: Nakhla and Lafayette delta 7Li values for samples and extracts (41-142i?½) are consistent with brine evaporation Relatively 13C-poor siderite in Lafayette suggests more than one carbon source was sampled
6 citations