Apulia Carbonate Platform

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The Apulia Carbonate Platform in Apulia, Italy was a major palaeogeographic element of the southern margin of the Mesozoic Tethys Ocean. It is one of the so-called peri-Adriatic platforms, which are comparable to the Bahama Banks in their carbonate facies, shape, size, and subsidence rate and, also, in the internal architecture. [1] [2] [3] [4] [5] [6] [7]

Contents

The Apulia Platform, which is part of the stable and relatively undeformed foreland of the Apennine thrust belt, is bounded on both sides by basinal deposits; westward the margin is buried under the Apennine thrust sheets, to the east the adjacent paleogeographic domains are the vast Ionian Basin to the south and the Umbria-Marche Basin to the north. To the west, the Apulia Platform plunges downfaulted underneath the terrigenous sediments of the Apennine foredeep; to the southeast, the Jurassic–Early Cretaceous margin lies 20–30 km offshore from the present Apulia coastline. [8] [9]

Gargano Promontory

The Gargano Promontory is an area of the Apulia Platform. [10] The Gargano Promontory and the Maiella Mountain, which now is part of the external Apennine thrust belt, [3] are the only areas where the transition from platform facies to basin facies is exposed on land. In the Gargano area this transition has been investigated extensively in the last decade. [11] [12] [13] [14] [15] [16] [17] [18] Since the mid-1960s AGIP geologists and the Italian Geological Survey [19] [20] [21] recognized that the western part of the promontory is part of the shallow-water Apulia Platform, whereas the eastern part is characterized by slope and basinal deposits.

The backbone of the Gargano Promontory consists of a thick pile (3000–3500 m) of Jurassic and Cretaceous shallow-water carbonates. A small outcrop of Upper Triassic evaporite (Anidriti di Burano) and black limestone is present on the northern seashore (Punta delle Pietre Nere). These rocks have been encountered also by wells Gargano-1 (G.1 - Conoco) and Foresta Umbra-1 (F.U. - AGIP). The outcropping succession comprises Upper Jurassic to Eocene carbonate rocks representing platform-to-basin settings. [12] [15] [20] Minor scattered outcrops of Miocene sediments, unconformably overlying the Cretaceous and Jurassic platform, are present in many parts of the promontory, mainly along the lowland border zones (Cagnano Varano, Sannicandro, Apricena, Manfredonia), and also one site inland near San Giovanni Rotondo. [21]

On the basis of physical stratigraphic relationships and of the presence of evident bounding surfaces, the Jurassic-Eocene succession can be subdivided into six major packages of sediments, which can be classified as second-order depositional sequences. [5] The lower three sequences (Callovian to Albian) are represented by the entire spectrum of sediments from platform to slope and basin, and the younger ones (Cenomanian to Lutetian) largely by slope and basin deposits.

Probably the most typical and significant feature of the Gargano slope and basin setting is the presence of huge megabreccia bodies which, in terms of sequence stratigraphic terminology, can be interpreted as typical lowstand wedges. [22]

Notes

  1. ↑ D'Argenio B. (1976). Le piattaforme carbonatiche periadriatiche. Una rassegna di problemi nel quadro geodinamico mesozoico dell'area mediterranea. Società Geologica Italiana, Memorie13 (1974): 137–159.
  2. ↑ Eberli (1991)
  3. 1 2 Eberli G.P., Bernoulli D., Sanders D., Vecsei A. (1993). From aggradation to progradation: the Maiella Platform, Abruzzi, Italy. In: Simo T., Scott R.W., Masse J.P. (eds). Cretaceous Carbonate Platforms: American Association of Petroleum Geologists, Memoir 56, pp. 213–232.
  4. ↑ Morsilli M. (1998). Stratigrafia e sedimentologia del margine della Piattaforma Apula nel Gargano (Giurassico superiore-Cretaceo inferiore). Tesi di Dottorato di Ricerca, Università di Bologna, 203 pp. Librerie Nazionali di Roma e Firenze.
  5. 1 2 Bosellini A., Morsilli M., Neri C. (1999). Long-term event stratigraphy of the Apulia Platform margin: Upper Jurassic to Eocene, Gargano, southern Italy. Journal of Sedimentary Research69: 1241–1252. Tulsa.
  6. ↑ Bosellini A., Morsilli M., Neri C. (2000). The eastern margin of the Apulia Platform: the Gargano transect. Excursion guide-book. In: A. Bosellini, M. Morsilli & C. Neri (eds). "Quantitative Models on Cretaceous Carbonate", S.E.P.M Cretaceous Resource Events and Rhythms, WG4 meeting, field trip guide book, 46 pp. Vieste.
  7. ↑ Bosellini A., Morsilli M. (2001). Il Promontorio del Gargano: cenni di geologia e itinerari geologici. Quaderni del Parco Nazionale del Gargano, 48 pp., Foggia.
  8. ↑ De Dominicis and Mazzoldi (1989)
  9. ↑ De Alteriis and Aiello (1993)
  10. ↑ Conti M.A., Morsilli M., Nicosia U., Sacchi E., Savino V., Wagensommer A., Di Maggio L., Gianolla P. (2005). Jurassic Dinosaur Footprints from Southern Italy: Footprints as Indicators of Constraints in Paleogeographic Interpretation. Palaios20 (6): 534–550.
  11. ↑ Luperto Sinni and Masse (1987)
  12. 1 2 Masse and Luperto Sinni (1989)
  13. ↑ Bosellini and Ferioli (1988)
  14. ↑ Bosellini A., Neri C., Luciani V. (1993). Guida ai carbonati cretaceo-eocenici di scarpata e bacino del Gargano (Italia meridionale). Università di Ferrara, Annali: Sezione Scienze della Terra, supplemento4: 1–77.
  15. 1 2 Bosellini A., Neri C., Luciani V. (1993). Platform margin collapses and sequence stratigraphic organization of carbonate slopes: Cretaceous-Eocene, Gargano Promontory, southern Italy. Terra Nova5: 282–297.
  16. ↑ Bosellini et al.. (1994)
  17. ↑ Bosellini A., Morsilli M. (1997). A Lower Cretaceous drowning unconformity on the eastern flank of the Apulia Platform (Gargano Promontory, southern Italy). Cretaceous Research18: 51–61. Belfast.
  18. ↑ Morsilli M., Bosellini, A. (1997). Carbonate facies zonation of the Upper Jurassic-Lower Cretaceous Apulia Platform margin (Gargano Promontory, southern Italy). Rivista Italiana di Paleontologia e Stratigrafia103: 193–206.
  19. ↑ Pavan and Pirini (1966)
  20. 1 2 Martinis and Pavan (1967)
  21. 1 2 Cremonini et al.. (1971)
  22. ↑ Sarg (1988)

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References

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