Stratigraphic architecture of the Gordón Member, and its paleogeographic implications (Frasnian, Cantabrian Mountains, Spain)
DOI:
https://doi.org/10.21701/bolgeomin/135.2/002Keywords:
Frasnian, Peripher al bulge, Clastic wedge, Cantabrian ZoneAbstract
The Gordón Member (lower-middle Frasnian, sequence A) of the Cantabrian Zone forms an asymmetric depositional cycle, characterized by a basal thin, transgressive fining-upward part, indicating the early Frasnian transgression against the Cantabrian Massif towards the north, and a distinct overlying coarsening- and shallowing-upward package, when the available accommodation space was filled. A tectonic shortening by thrusts and folds in the southern part of the Somiedo–Correcilla Unit of 41% is estimated. From the restored original extent, the Gordón depositional environment is re-interpreted as a southward sloping, mixed siliciclastic carbonate shelf. There is a change in basin configuration from an extensive gentle dipping profile (sequence A), to a narrow steeper profile with an increase in the depositional dip (sequences B, C), caused by uplift and enlargement of the core area of the Cantabrian Zone, and subsidence of the External Zone.
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