Architecture and depositional development of the Eocene deep-marine Morillo and Coscojuela Formations, Aínsa Basin, Spain
Article first published online: 6 MAY 2013
Copyright © 2013 John Wiley & Sons, Ltd.
Volume 49, Issue 3, pages 221–238, May/June 2014
How to Cite
Pohl, F. and McCANN, T. (2014), Architecture and depositional development of the Eocene deep-marine Morillo and Coscojuela Formations, Aínsa Basin, Spain. Geol. J., 49: 221–238. doi: 10.1002/gj.2511
- Issue published online: 5 MAY 2014
- Article first published online: 6 MAY 2013
- Manuscript Accepted: 27 MAR 2013
- Manuscript Received: 3 JUL 2012
- DeutscheForschungsGemeinschaft. Grant Number: DFG: MC10/10-1)
- Morillo Formation;
- Coscojuela Formation;
- Aínsa Basin;
The Aínsa Basin of northern Spain contains a deep-marine succession comprising up to 24 sandstone bodies separated by thick marl-rich units. A detailed analysis of nine outcrops (>900 m of sediment profiles) from the Morillo Formation of the San Vicente Group, from the upper part of the basin succession, has enabled a reappraisal of the unit. Within the Morillo Formation, sediment transport was to the NW, and a range of environments are recognized including channels, lobes and pelagic deposits. The overlying Coscojuela Formation, which partly cuts into the Morillo Formation, shows W-directed palaeocurrents in its proximal reaches, with flows being deflected to the N along an adjacent slope. Destabilization of the adjacent carbonate platform resulted in a significant input of carbonate material into the flow. The final phases of sedimentation within the Aínsa Basin were more complex than previously suspected, probably as a result of a combination of factors, including tectonic activity, resulting in basin narrowing due to anticlinal growth, as well as encroachment and/or destabilization of the adjacent regional carbonate platforms. Copyright © 2013 John Wiley & Sons, Ltd.