Neumann, Mareike; Decker, Charlotte; Hallmann, Christian: Cheilanthane ratios in Mesoproterozoic to Early Paleozoic rocks [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.932811 (dataset in review)
Abstract:
This data set contains values on the cheilanthane (tricyclic terpenoids) ratios of C22/C21 and C24/23 from Mesoproterozoic to Silurian rocks of global distribution. Lipid extractions were performed following standard protocols. The yield was contamination-controlled via exterior vs. interior comparison of individual peak concentrations. Values were obtained via integration of multiple-reaction-monitoring (MRM) measurements. In comparing our data of cheilanthane ratios to that reported for younger rocks and oils, we noticed consistently lower C24/C23 values in our samples, suggesting a bimodal character of cheilanthane distribution in time. We tentatively attribute this to the rise of a source of oxidatively decarboxylated cheilanthatriol derived from ferns. Fossil cheilanthanes likely represent a composite mixture of various biological sources, whose secular patterns may record more than the Paleozoic rise of terrestrial plants presented here.
Related to:
Neumann, Mareike; Decker, Charlotte; Hallmann, Christian (submitted): Bimodal secular tricyclic terpenoid patterns reflect Paleozoic terrestrialization. Organic Geochemistry
Coverage:
Median Latitude: -0.426725 * Median Longitude: 95.811156 * South-bound Latitude: -34.800000 * West-bound Longitude: 14.310000 * North-bound Latitude: 58.330000 * East-bound Longitude: 140.632300
Minimum SECTION, height: 64.480 m * Maximum SECTION, height: 1070.900 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Neumann, Mareike | |||
| 2 | Cheilanthane, C22/C21 ratio | C22/C21 | Neumann, Mareike | |||
| 3 | Cheilanthane, C24/C23 ratio | C24/C23 | Neumann, Mareike | |||
| 4 | Laboratory code/label | Lab label | Neumann, Mareike | Hallmannlab ID | ||
| 5 | Geologic age name | Geol age | Neumann, Mareike | |||
| 6 | Outcrop ID | Outcrop ID | Neumann, Mareike | Core/Outcrop | ||
| 7 | SECTION, height | Section | m | Neumann, Mareike | Geocode | |
| 8 | Formation | Formation | Neumann, Mareike |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
302 data points