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Eickmann, Benjamin; Bach, Wolfgang; Kiel, Steffen; Reitner, Joachim; Peckmann, Jörn Ludwig (2010): Electron microprobe results of clay minerals from samples of the Frankenwald and the Thüringer Wald. PANGAEA, https://doi.org/10.1594/PANGAEA.754373, Supplement to: Eickmann, B et al. (2009): Evidence for cryptoendolithic life in Devonian pillow basalts of Variscan orogens, Germany. Palaeogeography, Palaeoclimatology, Palaeoecology, 283, 120-125, https://doi.org/10.1016/j.palaeo.2009.09.006

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Abstract:
Late Devonian (Frasnian) pillow basalts from the Frankenwald and Thüringer Wald within the Saxothuringian zone in Germany were found to contain abundant putative biogenic filaments, indicating that the volcanic rocks once harbored microbial life. The mineralized filaments are found in calcite-filled amygdules (former vesicles), where they started to form on internal surfaces of vesicles after seawater ingress. The filaments postdate an early fibrous carbonate cement but predate later equant calcite spar, revealing syngenetic formation. A biogenic origin of filaments is indicated by their size and morphology resembling modern microorganisms, their independence of crystal faces and cleavage plans, complex branching patterns, and internal segmentation. The filamentous microorganisms represent cryptoendoliths that lived in structural cavities of the basalt. They became preserved upon microbial clay authigenesis similar to the encrustation of modern prokaryotes in iron-rich environments. Filaments consist of clay minerals with the endmember composition berthierine-chamosite and illite-glauconite. Based on the discovery of fossilized filamentous microorganisms in Late Devonian pillow basalts of the Saxothurigian zone that are similar to filaments previously found in Middle Devonian pillow basalts of the Rhenohercynian zone, it is apparent that cryptoendolithic life was more widespread than previously recognized. Structural cavities within seafloor basalt may thus represent a common, perhaps universal niche for life in the oceanic crust.
Coverage:
Median Latitude: 50.396950 * Median Longitude: 11.684550 * South-bound Latitude: 50.169200 * West-bound Longitude: 11.527200 * North-bound Latitude: 50.624700 * East-bound Longitude: 11.841900
Event(s):
FW-05-b * Latitude: 50.169200 * Longitude: 11.527200 * Location: Frankenwald, northern Bavaria, Germany * Device: Geological sample (GEOS)
TH-be-08-09C * Latitude: 50.624700 * Longitude: 11.841900 * Location: Thuringian Forest, Germany * Device: Geological sample (GEOS)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample IDSample IDEickmann, BenjaminElectron microprobe JEOL JXA 8900R
2Facies name/codeFaciesEickmann, BenjaminElectron microprobe JEOL JXA 8900R
3Silicon dioxideSiO2%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
4Titanium dioxideTiO2%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
5Aluminium oxideAl2O3%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
6Chromium(III) oxideCr2O3%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
7Iron oxide, FeOFeO%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
8Manganese oxideMnO%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
9Magnesium oxideMgO%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
10Calcium oxideCaO%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
11Potassium oxideK2O%Eickmann, BenjaminElectron microprobe JEOL JXA 8900R
12SumSum%Eickmann, BenjaminCalculated
Size:
1488 data points

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