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First evidence of middle to late Cambrian deposition by first palynological data from the Torgau–Doberlug Syncline (subsurface Central Germany, Mediterranean shelf of Gondwana)

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Abstract

Purpose

Cambrian to Ordovician sequences in Germany are known from only a few regions of limited geographic extent. One of the largest of these regions is represented by the Torgau–Doberlug Syncline (TDS) where fossiliferous early to mid-Cambrian strata occur in the subsurface. Cambrian skeletal fauna and archaeocyathan-calcimicrobial reef mounds from this area indicate a West-Gondwanan Mediterranean palaeogeographic affiliation. However, organic-walled microfossils were not studied so far.

Methods

New palynological research on the old and recently sampled, but hitherto non-investigated drilling core Wis BWA 1686-81 provided a moderately diverse acritarch microflora.

Results

The moderately diverse acritarch assemblage is dominated by diverse leiosphaerids and the stratigraphically important genera Cristallinium, Eliasum, and Timofeevia associated with specimens representing most probably the “galeate” acritarch plexus (particularly Cymatiogalea, Priscogalea, and Stelliferidium) and a few further acritarch genera. This microflora points to a biostratigraphic position within the Cambrian Series 3 to possibly early-Furongian age including indicating for the first time that there was deposition in this palaeogeographic region continuing to the latest mid-Cambrian. The hitherto assumed sedimentary gap from early mid-Cambrian until Ordovician which seems to be common in whole Saxo-Thuringia is now slightly shorter.

Conclusion

The results support the model of a connected Cambro-Ordovician “Mediterranean shelf” with closely related internal areas and with well comparable early Palaeozoic sequences from Spain in the Southwest of Europe until East-Central Europe at least with the TDS as their today northernmost occurrence.

Resumen

Objetivo

Las secuencias del Cámbrico a Ordovícico son reconocidas sólo en pocas áreas de Alemania. Una de las regiones más estudiadas corresponde al Sinclinal Torgau-Doberlug (TDS), donde afloran estratos fosilíferos del Cámbrico medio a temprano. Paleofauna esquelética del Cámbrico y montículos microbianos compuestos por arqueociatios y colonias de microfósiles calcáreos indican que está zona posee una relación paleográfica con el Mediterráneo del Gondwana Occidental. Sin embargo, los microfósiles de paredes orgánicas aún no han sido estudiadios.

Metodología

Nueva investigación palinológica en muestras antiguas y recientemente muestreadas, pero hasta ahora no investigado, Wis BWA 1686-81 proporcionaron una microflora de acritarco moderadamente diversa.

Resultados

Se logró determinar un conjunto moderadamente diverso de acritarcos, dominado principalmente por leiosphaeridia y los géneros estratigráficamente importantes como Cristallinium, Eliasum y Timofeevia, los que se encuentran asociados con otros especímenes que problablemente representan al plexo de acritarcos “galeate” (como Cymatiogalea, Priscogalea y Stelliferidium) entre otros del género de acritarcos.

Conclusiones

Esta microflora apunta a una posición bioestratigráfica del Cámbrico, específicamente dentro la Serie/Época 3 a probalemente al Furongiense temprano, indicando por primera vez una depositación en esta región paleogeográfica que continúa hasta la última mitad del Cámbrico. La brecha sedimentaria, hasta ahora asumida desde principios del Cámbrico hasta el Ordovícico que parece ser común en toda Saxo-Thuringia, ahora es un poco más corta. Los resultados apoyan el modelo de una "plataforma mediterránea" Cambro-Ordovícica conectada con áreas internas estrechamente relacionadas y con secuencias paleozoicas tempranas comparables con las del sudoeste de Europa (España) hasta Europa Centro-Oriental, al menos con el TDS como su ocurrencia más septentrional.

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Fig. 1

Modified from Linnemann et al. (2010)

Fig. 2

Modified from Elicki (2015)

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Acknowledgements

Many thanks goes to the Geological Survey of Brandenburg (LBGR) and especially to M. Göthel for the allowance to and the help in investigation of drilling cores. This research was supported by the project PROGRES Q45 of the Ministry of Education, Youth and Sports of Czech Republic (support of O.F.).

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Correspondence to Abubaker Atnisha.

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Atnisha, A., Fatka, O. & Elicki, O. First evidence of middle to late Cambrian deposition by first palynological data from the Torgau–Doberlug Syncline (subsurface Central Germany, Mediterranean shelf of Gondwana). J Iber Geol 43, 601–614 (2017). https://doi.org/10.1007/s41513-017-0041-3

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