JMDMT #657 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - More complex materials, including polynuclear 1,000 5 100 o Q. 20 z — 1 r- "T 1 1 1 1 1 1 1 1 1 1 - %3E— -.'1 /*.i*ll oio. \ Orgueil (distillate) - /\ Orgueil (saturated HC fraction) — "/' Butter jr _ Recent sediments v \ '5v /" - — — ■-' y C''*--.. "/ v~ - CHg.g Series ~~— -' 1 1 1 1 1 1 1 1 1 1 1 1 1 \ 15 20 Carbon Number 25 Figure 10. Mass spectrum of meteorilic hydrocarbons and 2 biogenic reference materials (Nagy et al., 1961). In the CnHsn.e series, the meteorilic and terrestrial mass spectra show a strong resemblance to each other, but because the contribution of fragment ions to the peaks is quite large in this series, the similarity in peak heights does not necessarily imply a simi- larity in hydrocarbon distribution.
Author: h4ck3rm1k3
Keywords: Meteorite Life Fossils Cyanobacteria Carbonaceous
Added: November 21, 2008
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JMDMT #654 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - » / - \' - _ OrgueiKdistillate ) V - Orguell (saturated HC fraction ) ~ Butter Recent sediments 1 1 1 1 1 1 1 1 1 15 20 Carbon Number 25 Figure 9. Mass spectrum of meteoritic hydrocarbons and 2 Ijiogenic reference materials (Nagy el al., 1961). The observed peak heights in the C„Ho„+.. series are probably due, mainly, to parent ions of saturated hydrocarbons, although fragment ions of other substances also contribute. The difference between the original Orgueil distillate and the chemically separated, saturated hydrocarbon fraction indicates that large amounts of other substances were present in the distillate. isomers. But it is essential not to equate the concepts "abiotic" and "non- selective." Industrial
Author: h4ck3rm1k3
Keywords: Meteorite Life Fossils Cyanobacteria Carbonaceous
Added: November 21, 2008
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Added: November 21, 2008
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JMDMT #652 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - et al., 1961) and the chromatographically separated hydrocarbon fraction (Meinschein, 1961) shows that even in this favorable case, some 70 to 90 per cent of the originally observed peak height came from compounds other than saturated hydrocarbons.* In figure 10, the resemblance is very good, and the changes have been moderate, but as pointed out, the peaks in this series contain substantial contributions from so many different sources, that it seems unsafe to infer a similarity in parent hydrocarbon distribution from a similarity in peak heights. Finally, one must not overlook the possibility that the observed hydrocarbon * This sample is not strictly comparable to the original distillate, collected in the range 250° to 400° C, because it also contains the 400° to 500° C. fraction. But differences of the
Author: h4ck3rm1k3
Keywords: Meteorite Life Fossils Cyanobacteria Carbonaceous
Added: November 21, 2008
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JMDMT #651 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - in Carbonaceous Chondrites (Boato, 1954) Meteorite Class H2O 6D % % Ivuna A 7.0 -1-35.8 Orgueil A 7.3 -1-29.0 Cold Bokkeveld (London) C 7.8 -13.0 Cold Bokkeveld (Paris) C 8.0 -5.8 Mighei C 8.6 -6.4 Murray C 6.8 +9.6 Lance D 0.9 -7.7 Mokoia E 0.8 +25.9 Terrestrial waters -15 to +5 CnHon , CnH2n-2 , aud CnH2n-4 families, with possible additional contributions from nitrogen and oxygen compounds. Thus, it seems fair to attribute most ob the observed peak height in the C„H2n+2 series to paraffins. However, just in the case of this series, the resemblance is rather poor (figure 9), and the great difference between the spectra of the original Orgueil distillate (Nagy
Author: h4ck3rm1k3
Keywords: Meteorite Life Fossils Cyanobacteria Carbonaceous
Added: November 21, 2008
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JMDMT #650 Microfossils of Cyanobacteria in Carbonaceous Meteorites
The James M. DuPont Meteorite Collection - to the entire mass spectrum, and to a larger variety of biogenic reference materials, certain additional resem- blances, but also certain differences appear. It seems very difficult to decide, on purely objective grounds, whether these resemblances are strong enough to prove a biological origin. There is also a question to what extent the peak height at a given mass num- ber may be taken as a measure of the amount of parent hydrocarbon of this mass. This is a good assumption for the [CnHiH+o]" ions derived from the CnH.2n+2 paraffius. But as one goes to compounds progressively poorer in hydrogen, the ambiguity increases. The [CnH-in-e]"*" ions are derived not only from the C„H-2„_6 ( = tetracycloalkane) series, but also from the CuH2u+2 , Table 8 Hydrogen Isotopic Composition
Author: h4ck3rm1k3
Keywords: Meteorite Life Fossils Cyanobacteria Carbonaceous
Added: November 21, 2008
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