Sequence stratigraphy and paleontology of the upper Miocene Pisco Formation along the western side of the lower Ica Valley (Ica desert, Peru)
| Autor: | Di Celma, C, MALINVERNO, ELISA, BOSIO, GIULIA, Collareta, A, Gariboldi, K, Goncada, A: Molli, G, BASSO, DANIELA MARIA, Varas Malca, R. M: Pierantoni, P. P, VILLA, IGOR MARIA, Lambert, O, Landini, W, Sarti, G, Cantalamessa, G, Urbina, M, Bianucci, G. |
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| Přispěvatelé: | Di Celma, C, Malinverno, E, Bosio, G, Collareta, A, Gariboldi, K, Goncada, A:, M, G, Basso, D, Varas, M, R., M, P., P, Villa, I, Lambert, O, Landini, W, Sarti, G, Cantalamessa, G, Urbina, M, Bianucci, G |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010506 paleontology
Pisco Formation sequence stratigraphy lcsh:QE1-996.5 late Miocene vertebrate and macro-invertebrate paleontology diatom biostratigraphy tephrochronology 010502 geochemistry & geophysics GEO/01 - PALEONTOLOGIA E PALEOECOLOGIA 01 natural sciences lcsh:Geology lcsh:Paleontology GEO/08 - GEOCHIMICA E VULCANOLOGIA GEO/02 - GEOLOGIA STRATIGRAFICA E SEDIMENTOLOGICA lcsh:QE701-760 0105 earth and related environmental sciences |
| Zdroj: | Scopus-Elsevier Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy); V. 123, N. 2 (2017) Rivista italiana di Paleontologia e Stratigrafia; V. 123, N. 2 (2017) Rivista Italiana di Paleontologia e Stratigrafia, Vol 123, Iss 2 (2017) |
| ISSN: | 2039-4942 0035-6883 |
| Popis: | The sequence stratigraphic framework and a summary of the fossil fauna of the upper Miocene portion of the Pisco Formation exposed along the western side of the Ica River (southern Peru) is presented through a new geological map encompassing an area of about 200 km2 and detailed chronostratigraphic analyses. Extensive field mapping and sedimentological study of outcrop sections have shown that the Pisco Formation is a cyclical sediment unit composed of at least three fining-upward, unconformity-bounded depositional sequences, designated P0, P1, and P2 from oldest to youngest. In the study area, these sequences progressively onlap a composite basal unconformity from southwest to northeast. Integration of biostratigraphic and tephrochronologic age determinations constrains the ages of the three Pisco sequences within the study area. Based on the age of surrounding sediments, a conservative estimate of the age of P0 suggests deposition of these strata between 17.99 ± 0.10 Ma and 9.00 ± 0.02 Ma, whereas diatom biostratigraphy and calculated 40Ar/39Ar ages converge to indicate that strata of the P1 sequence were deposited sometime between 9.5 Ma and 8.9 Ma and that those of the P2 sequence are younger than 8.5 Ma and older than 6.71 ± 0.02 Ma. Our survey for both vertebrate and macro-invertebrate remains in the three sequences confirms the outstanding paleontological value of the Pisco Formation and contributes to depict regional faunal shifts in the fossil assemblage. Rivista Italiana di Paleontologia e Stratigrafia (Research In Paleontology and Stratigraphy), V. 123, N. 2 (2017) |
| Databáze: | OpenAIRE |
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