Shell bed stacking patterns in the Chachao formation (Early Valanginian) in Malargüe area, Mendoza Province, Neuquen Basin-Argentina
The Lower Cretaceous Chachao Formation in the Malargüe anticline area consists of wackestone, packstone, and minor grainstone and mudstone rich in benthic fauna which were deposited in a shallow carbonate ramp. These shell beds are composed of a low-diversity molluscan fauna mostly dominated by oyst...
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Northeastern Science Foundation Inc.
2001
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| LEADER | 14001caa a22009497a 4500 | ||
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| 001 | PAPER-20709 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518205208.0 | ||
| 008 | 190411s2001 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0035718996 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Palma, R.M. | |
| 245 | 1 | 0 | |a Shell bed stacking patterns in the Chachao formation (Early Valanginian) in Malargüe area, Mendoza Province, Neuquen Basin-Argentina |
| 260 | |b Northeastern Science Foundation Inc. |c 2001 | ||
| 270 | 1 | 0 | |m Palma, R.M.; Departamento de Geologia, Facultad Ciencias Exactas/Naturales, Universidad de Buenos Aires, Av. Rafael de Obligado s/n, Buenos Aires 1428, Argentina; email: palma@gl.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The Lower Cretaceous Chachao Formation in the Malargüe anticline area consists of wackestone, packstone, and minor grainstone and mudstone rich in benthic fauna which were deposited in a shallow carbonate ramp. These shell beds are composed of a low-diversity molluscan fauna mostly dominated by oysters, other benthic pelecypods (Eryphila sp., Ptychomya sp., Pecten sp., Pinna sp., Trigonia sp., Cucullaea sp.), serpulids (Sarcinella sp., Parsimonia sp.), and occasional ammonites (Olcosthepanus curacoensis). Most skeletal accumulations range from 15 to 70 cm in thickness. Shell beds exhibit a sharp, flat and commonly undulating base. In some cases the tops were bioturbated principally by Thalassinoides isp. Some shell beds show a densely packed biofabric (bioclastic-supported) but most of them have dispersed or loosely packed biofabric (mud-supported). Bioclasts include articulated or disarticulated shells, fragmented valves and shell debris. The analysis of shell concentrations of the Chachao Formation allow to recognize four taphofacies according to their taphonomic attributes. Different kind of processes, such as low-energy storm currents and waves, were interpreted, whose deposits are arranged into a coarsening- and thickening-upward and then fining- and thinning upward trends. According to their biostratinomic features shell beds of Chachao Formation have been interpreted as parautochthonous to autochthonous skeletal concentrations, mainly of sedimentologic origin. Towards the end of the Valanginian, the drowning of the carbonate ramp took place, related to a relative sea level rise and environmental stress. This drowning event was recorded by the alternating thin- to medium bedded dark gray carbonate and black shales (Agrio Formation) of Late Valanginian-Late Hauterivian age. |l eng | |
| 593 | |a Departamento de Geologia, Facultad Ciencias Exactas/Naturales, Universidad de Buenos Aires, Av. Rafael de Obligado s/n, Buenos Aires 1428, Argentina | ||
| 690 | 1 | 0 | |a CRETACEOUS |
| 690 | 1 | 0 | |a DEPOSITIONAL ENVIRONMENT |
| 690 | 1 | 0 | |a PALEOENVIRONMENT |
| 690 | 1 | 0 | |a SHELL BED |
| 690 | 1 | 0 | |a STRATIGRAPHY |
| 690 | 1 | 0 | |a TAPHONOMY |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a MENDOZA PROVINCE | |
| 651 | 4 | |a NEUQUEN BASIN | |
| 700 | 1 | |a Lanés, S.G. | |
| 773 | 0 | |d Northeastern Science Foundation Inc., 2001 |g v. 16 |h pp. 168-180 |k n. 2 |p Carbonates Evaporites |x 08912556 |t Carbonates and Evaporites | |
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