A revised age-model for the Eocene deep-marine siliciclastic systems, Aínsa Basin, Spanish Pyrenees
Posted on 2020-08-05 - 11:10
Using new palaeomagnetic and biostratigraphic data, we revise the age-model for the middle Eocene, deep-marine, Aínsa Basin (Spanish Pyrenees), a tectonically active basin formed at a convergent-plate margin. This new age model provides a framework for evaluating the depositional history and sediment accumulation rates. New integrated magneto- and biostratigraphy data identifies two normal and two reverse chrons of the geomagnetic polarity timescale (C21r, C21n, C20r, C20n) and place these Upper Hecho Group deposits in the middle Eocene (Lutetian). Nannofossil analysis identifies a biostratigraphic range from Subzone NP14b in the Gerbe System to Subzone NP15b at the top of the Aínsa System using key, age-diagnostic marker species such as Blackites inflatus, Blackites piriformis and Coccolithus gigas. We also present new nannofossil biostratigraphy from the Lower Hecho Group. This new Aínsa Basin chronostratigraphy enables inter-basinal correlations between the proximal fluvio-deltaic Tremp–Graus Basin and the more distal Jaca Basin, thereby providing a better understanding of the basin evolution.
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Cantalejo, Blanca; Pickering, Kevin T.; McNiocaill, Conall; Bown, Paul; Johansen, Kyrre; Grant, Melissa (2020). A revised age-model for the Eocene deep-marine siliciclastic systems, Aínsa Basin, Spanish Pyrenees. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.5083076.v1
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AUTHORS (6)
BC
Blanca Cantalejo
KP
Kevin T. Pickering
CM
Conall McNiocaill
PB
Paul Bown
KJ
Kyrre Johansen
MG
Melissa Grant
CATEGORIES
KEYWORDS
Pyreneeínsa BasinSubzone NP 14bEocene deep-marine siliciclastic sy...middle EocenebiostratigraphyC 21r C 21n C 20r C 20nUpper Hecho Group depositsbiostratigraphicage-diagnostic marker speciesSubzone NP 15bBlackiteínsa Basin chronostratigraphyage-modelgeomagnetic polarity timescaledatasediment accumulation ratesSpanishGeology