Person: Martín Chivelet, Javier
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First Name
Javier
Last Name
Martín Chivelet
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Geodinámica, Estratigrafía y Paleontología
Area
Estratigrafía
Identifiers
5 results
Search Results
Now showing 1 - 5 of 5
Item Sedimentology and sequence stratigraphy of a Tithonian–Valanginian carbonate ramp (Vaca Muerta Formation): A misunderstood exceptional source rock in the Southern Mendoza area of the Neuquén Basin, Argentina(Sedimentary geology, 2014) Kietzmann, Diego A.; Palma, Ricardo Manuel; Riccardi, A.C.; Martín Chivelet, Javier; López Gómez, JoséThe Vaca Muerta Formation (early Tithonian–early Valanginian) is a rhythmic succession of marls and limestones, cropping out in the Neuquén Basin, west-central Argentina. This lithostratigraphic unit was traditionally interpreted as basinal to slope deposits. Detailed facies analysis allows to differentiate seven facies associations, representing basinal to middle ramp facies of a homoclinal ramp system prograding westward from the eastern margin, and slope facies attributed to a distally steepened rampsystemthat progrades eastward fromthe Andean volcanic arc in the west. Two sequence hierarchies are recognized: five third order depositional sequences, and fifteen fourth order high-frequency sequences. Fluctuations in organic matter content within the Vaca Muerta Formation suggest relationship with depositional sequences, finding the highest values associated with transgressive systemtracts. This work represents an important advance in the understanding of the sedimentary and stratigraphic evolution of this exceptional unconventional reservoir. Our sequence stratigraphic approach contributes to the understanding of the relationship between organic matter, facies, and sea-level changes.Item Peritidal cyclic sedimentation from La Manga Formation (Oxfordian), Neuquén Basin, Mendoza, Argentina(Journal of South American earth sciences, 2013) Palma Durán, Ricardo; Kietzmann, Diego A.; Bressan, Graciela Susana; Martín Chivelet, Javier; López Gómez, José; Farias, María E.; Iglesias Llanos, María P.The La Manga Formation consists of marine carbonates and represents most of the sedimentary record of the Callovian-Oxfordian in the Neuquén Basin. Three localities in the southern Mendoza province were studied and their cyclicity was determined by means of facies analysis and their vertical arrangement. Facies of inner ramp, that were deposited in extremely shallow-water environments with intermittent subaerial exposures have been broken down into shallow subtidal, and intertidalesupratidal environments. Shallow subtidal facies are arranged into decimetre scale upward-hallowing cycles composed of marls, laminated or massive mudstones or bioclastic wackestones and intraclastic wackestone-packstones. Intertidal-supratidal centimetre-scale cycles consist of an upward-shallowing succession of restricted facies, overlaid by horizontal or crinkle microbial laminites, flat pebble conglomerates or breccias beds. The defined cycles show a shallowing upward trend in which the evidence of relative sea-level lowering is accepted. The interpretation of Fischer plots allowed the recognition of changes in accommodation space.Item Contornitas calcáreas en el Cretácico terminal de Caravaca (Dominio Subbético). Implicaciones paleogeográficas(Geotemas, 2001) Martín Chivelet, Javier; Chacón Pichaco, Beatriz; Fregenal Martínez, María AntoniaThis paper focuses on the deep marine carbonates of late Campanian to lower Maastricht!an age that crop out in the Subbetic Zone near Caravaca (Murcia province). Their sedimentological analysis allows to recognize a thick succession of dm-scale levels of calcareous "grainy" contourites alternating with fine-grained pelagites/hemipelagites. Those contourites, characterized by the abundance and variety of traction structures (horizontal and low angle bedding; cross-bedding, mud offshots, flaser bedding) together with other diagnostic features as internal erosive surfaces, inverse and normal grading at various scales, erosive bases, sharp top contacts), are interpreted as produced by bottom currents that were particularly intense during that time in the Betic basin, probably as a consequence of the onset of the contraction in the Mesozoic basins of Iberia. The Alpine convergence caused the closure in the latest Cretaceous of most former seaways (Pyrenean and Iberian basins) between the Atlantic and the Tethys oceans, and induced the progressive narrowing of the remaining seaway between Africa and Iberia.Item Chapter 10 Traction Structures in Contourites(Contourites, 2008) Martín Chivelet, Javier; Fregenal Martínez, María Antonia; Chacón, B.; Rebesco, M.; Camerlenghi, A.Publisher Summary This chapter reviews the traction structures in contourites that are formed in deep marine systems under the influence of oceanic bottom currents. Some general and theoretical constraints on the range of likely processes forming primary sedimentary structures in contourites are established. Each sedimentary structure is documented and analyzed under the constraints and the main controversial points are discussed. Traction structures are inherent to sediments generated or influenced by water flows. Contouritic deposits are developed in close association with bottom currents and show a noticeable variety of bedforms and structures; their study is essential for understanding the patterns of oceanic palaeocirculation. The controversy of traction-structures is also discussed. The proposed sediment structures are, (1) current ripples and cross-lamination, (2) lenticular and flaser bedding, (3) horizontal, subhorizontal, and sinusoidal lamination, (4) large -scale cross-bedding, (5) erosional structures, and (6) grading. The wide spectrum of sedimentary structures in contourites reflects the numerous factors that control their formation including current intensity, steadiness of flow, supply of sediment, hydrochemistry, texture, and composition of available sediment. The Faro Drift facies model and the Gulf of Mexico facies model emphasize the role of primary sedimentary structures.Item Evidence of precessional and eccentricity orbital cycles in a Tithonian source rock: The mid-outer carbonate ramp of the Vaca Muerta Formation, northern Neuquén Basin, Argentina.(AAPG bulletin, 2011) Kietzmann, Diego A.; Martín Chivelet, Javier; Palma, Ricardo Manuel; López Gómez, José; Lescano, Marina; Concheyro, AndreaBasin to mid-ramp cyclic facies of the Tithonian Vaca Muerta Formation are exposed in the Loncoche Creek section of the Neuquén Basin, Mendoza province, Argentina. This unit is characterized by a decimeter-scale rhythmic alternation of marls, shales and limestones and extends from the lower Tithonian to the upper Berriasian. Cyclostratigraphic studies based on a detailed facies analysis allowed the identification of cyclic patterns with frequencies within the Milankovitch band. According to biostratigraphic data, the dominant cycle in the studied section has a period of 20 k.y., which correlates with the Earth’s axis precession element. Spectral analysis based on a series of compacted and decompacted cycle thick-ness identified a subordinate frequency of about 90 to 120 k.y., which we interpret as the modulation of the precessional cycle caused by the Earth’s orbital eccentricity. The strength of the precession signal, together with the absence of a well-defined cyclicity attributable to the obliquity orbital cycle (i.e., ∼40 k.y.), is in agreement with previous data from the Northern Hemisphere.