Spit-platform temperate carbonates: the origin of landward-downlapping beds along a basin margin (Lower Pliocene, Carboneras Basin, SE Spain)
Article first published online: 12 JUN 2003
Volume 50, Issue 3, pages 553–563, June 2003
How to Cite
Braga, J. C., Betzler, C., Martín, J. M. and Aguirre, J. (2003), Spit-platform temperate carbonates: the origin of landward-downlapping beds along a basin margin (Lower Pliocene, Carboneras Basin, SE Spain). Sedimentology, 50: 553–563. doi: 10.1046/j.1365-3091.2003.00564.x
- Issue published online: 12 JUN 2003
- Article first published online: 12 JUN 2003
- Manuscriptreceived 27 March 2002; revisionaccepted 18 February 2003.
- Carboneras Basin;
- SE Spain;
- spit platform;
- temperate carbonates
ABSTRACT Lower Pliocene temperate carbonates exhibit landward-downlapping beds at the southern margin of the Carboneras Basin in south-eastern Spain. This rarely documented stratal geometry resulted from the accumulation of bedded bioclastic carbonate sand and gravel by longshore currents along a spit platform located a few hundred metres from the palaeoshoreline. The top of the spit platform was covered by shoals that extended over a gently dipping ramp inclined to the north. On the landward slope of the spit, sediments washed over from the shoal area were deposited in parallel-laminated beds with a southward dip of 8–11°. These beds aggraded and retrograded after an increase in accommodation space, probably related to an Early Pliocene eustatic sea-level rise. As a result, the beds downlap onto the underlying unconformity surface in a shoreward direction. Eventually, the depression between the shoreline and the spit platform was filled, and a gentle ramp became established. These Pliocene exposures in the Carboneras Basin and a similar Upper Miocene example in southern Spain suggest that landward-downlapping stratal geometries can be expected in nearshore temperate carbonates along basin margins, and demonstrate a similarity in sedimentary dynamics to siliciclastic sands and gravels.