STRATIGRAPHY

Author: PAREDES JOSE MATILDO.
Year: 2003.
University: BARCELONA [www.ub.es].
Place of defense: GEOLOGÍA.
Place of preparation: DPTO. DE ESTRATIGRAFÍA , PALEONTOLOGÍA Y GROCREENCIAS MARINAS.

Summary: Formation Chequen is a classic marine unit and bioclástica deposited during the Miocene bottom of the Gulf of San Jorge Basin, Argentina.Su power is 300-450 meters in the area studied, and is characterized by large swathes of the facies, environments platform with internal and external environments and estuarine controlled tides and storms. From the stratigraphic correlation of 20 sections, more than 500 surveys in the Northern Flank of the CGSJ is identificarón nine stratigraphic intervals marked by facies associations and electrofacies with distribution regional.Estos intervals can be assembled in five depositional sequences, which comprise cortejos transgrasivos and cortejos level alto.Los cortejos transgresivos are represented by bioclásticos subtidal waste deposited on a surface erosion subácuea, bands and bars subtidal channel with glauconita autigénica and clayey silt deposits platform externa.Los cortejos higher level are constituted internal storage platform, banks immature sandstones and coquina tempestíticas of subtidal environment, and levels heterolíticos generated in a position to sub intertidal, with a tendency somerizante. The unit is affected by numerous normal faults with displacements ranging from tilt tens of centimeters to 40 metros.En contact between Sarmiento Formation (Eocene medio-Mioceno below) and training Chequen are numerous veins filled with opal, chalcedony and with evidence of fracturing higráulica.Se identified in section countdown of the first phase depositacional numerous normal faults sinsedimentarias.Algunas faults are ractivaron after mioceno lower, and the entire cross Training Chequen, indicating that the extensional conditions persisted in the eastern sector the CJSG.

Author: LASTRAS MEMBRIVE GALDERIC.
Year: 2003.
University: BARCELONA [www.ub.es].
Place of defense: GEOLOGÍA.
Place of preparation: FACULTAT DE GEOLOGIA.

Author: IRIARTE AVILÉS ENEKO.
Year: 2004.
University: PAÍS VASCO [www.ehu.es].
Place of defense: ZIENTZIA ESTA TEKNOLOGIA FAKULTATEA.
Place of preparation: ZIENTZIA ETA TEKNOLOGIA FAKULTATEA.

Summary: This paper presents the results of the study of the Cretaceous in the eastern part of the Depression Intermediate, between the villages of Leitza and Elízondo (western Pyrenees, Navarre). For background information maps have been prepared at 1:25.000, and locally, at 1:10.000. There were differentiated 6 units and 5 subunits lithostratigraphic unpublished, which have been characterized bioestrateigráficamente through benthic foraminifera (Calizas of Aptiénse-Albiense) and planktonic foraminifera (marl and limestone of cenomaniense-Santoniense). We have identified 4 associations planktonic foraminifera, for the Albiense superior-Cenomaniense lower. Turoniense higher Turoniense superior-Coniaciense and Santoniense. It is proposed to create a new biozonal Local Area Falsotruncana maslakovae for Turoniense higher. The precise dating of materials has helped distinguish stratigraphic gaps, which include one of albiense middle and another between Albiense higher end (Vraconiense) and Turoniense higher. Sedmientológicamente have distinguished 3 systems deposionales: 1, carbonated Platform of Mokorro (Aptiense superior-Albiense below). 2, Platform mixta-talud-cuenca of Aixterri (Albiense superior-Cenomaniense below). 3, Plataforma-cuenca carbonated of Galardea (Turoniense superior-Campaniense). Several systems faults, folds, mismatches, and grooves are considered sub sinsedimentarias. They are grouped in 5 sentences tectosedimentarias: Phase I: Aptiense superior-Albiense lower. Phase II: Albiense medio-Albiense higher baseline. Phase III: Albiense higher. PHASE IV: Albiense higher end (Vraconiense) -Cenomaniense lower. PHASE V: Turoniense superior-Coniaciense. Denonatan the continued existence of a system of efforts transtensivo senestro except in Phase IV (Albíense superior-Vraconiense), consistent with efforts transpresivos within a model tear senestro of lfa Gap Leitza. Abundant features of both structural and tear sedimentary allow attributing the study area to a basin tear type fault-bend, limited by the shortcomings of Ollín and Leitza, reaching the area of displacement in the main flaw of Leitza. The evolution tectosedimentaria and paleogeográfica of the study area is integrated into the context of the Dominion Pyrenean and in the context of the Gulf of Bizakaia. Thus, history is part of the evolution of the plate boundary between Europe and Iberia, in connection with the opening of the Bay of Biscay and the Mid-Atlantic during the Cretaceous. A final chapter describes features petrológicos attributable to hídrotermalismo during the Cretaceous. It proposes a model related processes metamorphism in deep areas of the balla Leitza, composed in the evolution tectosedimentaria study area.

Author: FERNÁNDEZ FERRÍN CARLOS ALBERTO.
Year: 2004.
University: VIGO [www.uvigo.es].
Place of defense: FACULTAD DE CIENCIAS DEL MAR.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: 1. ESTRATIGRAFÍA SÍSMICA OF THE CONTINENTAL SHELF GALICIAN DURING THE CENOZOICO. We have identified nine high-resolution depositional sequences related cycles second (S1, S2, S3 and S4) and third (Sq4.1, Sq 4.2, Sq 4.3, Sq 4.4, and Sq 4.5) in the filling of the sedimentary platform southwest of Galicia. The main sequences are separated by surface discontinuities associated with changes eustáticos and tectonic most important developments in the area since the opening of the Atlantic. The sequences that correspond to the cycles 3eTorder are separated by five discontinuities that correspond to the most dramatic changes in sea levels that affected the Atlantic from the Miocene Superiorhasta today. 2. ESTRATIGRAFÍA SÍSMICA OF THE PLATFORM GALICIAN DURING THE CUATERNARIO analysis of seismic records very high resolution has enabled us to recognize and map the surface erosive related to the decline of WÃ ¼ rm Glacier and Last Maximum (LGM), the Rias Baixas and continental shelf. This area represents a major discontinuity developed directly on pleistocenos materials within the estuaries and in a high percentage of the platform. However, there are places where this discontinuity takes place directly on materials and even tertiary Mesozoic. The depth below the depth to which is this area has been measured, and this has allowed us to develop a paleobatimetría for LGM and a map of isopacas of seismic unit developed above. The map morfosedimentario the Galician platform has been compiled from data granulometric mapping, taking into account the detailed bathymetry of the area, the map of outstanding high resolution, and patterns sonográficos (side-scan sonar) available for the study area. 3. SUMMARY GAS IN RÍAS BAIXAS GALICIAN Accumulations of gas in the sediment filling of the Rias Baixas are detectable through the analysis of seismic records of very high resolution. We distinguish various types of gas accumulations based on their geometry dimensions and acoustic characteristics: Apantallamientos acoustic, acoustic curtains and columns. It was also evident leakage of gas, represented in the records for the occurrence of acoustic feathers and pockmarks. The mapping accumulations as well as the leakage of gas has been carried out for the Rias de Vigo, Pontevedra, and Arousa. 4. ESTRATIGRAFÍA SÍSMICA OF THE PLATFORM OF CANTERBURY (IS NEW ZEALAND) DURING THE CUATERNARIO TARDÍO The Platform of Canterbury is at the east margin of the South Island of New Zealand. It represents a very interesting side to the study of sedimentary response in a tectonically active area of oscilacionesdel sea level. During the Quaternary, a powerful succession of fluvial and marine sediments were deposited in the margin during periods of well-documented variations eustáticas. The main results from work are listed below: The main controlling factor in sedimentation on the platform of Canterbury is the eustasia, with a high influence also tectonics. The stratigraphic patterns interpreted consistent with the results of the implementation of the model and Browne Naish (2003) on the platform of Canterbury. The cyclicity is a Milankovitch, and the existence of "contomitas" significantly modified the geometry of the layers in the slope super 8 ior. 4. 4 f5 COMPARE TIVA BETWEEN THE PLATFORM OF GALICIA and CANTEBURY DURING THE CUATERNARIO architecture platforms Galicia and Canterbury during the Quaternary shows similarities and differences. The most striking similarity is the kind of courtship that builds sedimentary depositional sequences. In both areas, depositional sequences are composed of deposits of RST, except for the most recent depositional sequence, which consists of deposits of TST and HST. The main difference is in preserving these deposits. The platform Galician, depositional sequences are composed of deposits regressive little stacked resulting in a powerful architecture type agradacional, while the platform of Canterbury deposits of RST strongly influence the architecture progradacional the platform.

Author: ROBADOR MORENO ALEJANDRO.
Year: 2005.
University: PAÍS VASCO [www.ehu.es].
Place of defense: FACULTAD DE CIENCIA Y TECNOLOGÍA.
Place of preparation: DEPARTAMENTO DE ESTRATIGRAFÍA Y PALEONTOLOGÍA.

Summary: Although the Paleocene and Ilerdiense below are widely aflorados in the western Pyrenees, their stratigraphy and features sedimentológicas were comparatively worse than the outcrop known contemporary located in the eastern Pyrenees and in the Region Vasco-Cantábrica. The overall objective of this thesis was correct that deficiency, through geological mapping of outcrops and stratigraphic studies detailed sedimentological and the same. Rebuilding palinspástica through the refund to its original position delos alforamientos prior to the development of structures compressive Alpine, has enabled an estimate of the size of the original sedimentary systems. It has demonstrated that in the study area the Paleocene and Ilerdiense lower is overwhelmingly represented by carbonate systems, which had recognized a wide range of environments in shallow, dominated by cabonatos rich macroforaminíferos are recognized devices ramp or platforms defined margin, depending on the time interval. The move from the shallow, dominated by cabonatos rich macroforaminiferos are recognized ramp devices or platforms defined margin, depending on the time interval. The move from the shallow to the deep basin occurs through a slope transit (bypass), persistent across time, with a width of 4 to 6 km., And a slope of 4 to 8.5 . The foot of the slope, in order, is represented by a type system 'slope-apron', characterized by deposits resedimentados (carbonated gaps and calciturbitas) alternating with limestone and marl hemipelágicas rich in planktonic foraminifera. Succession study has been divided into 6 sequences depositional value Regional, which have been dated by macroforaminíferos and formaníferos planktonic. Streams deposiconales are bounded by disocntinuidades that in the domain cursory, are marked for exposure subaérea horizons, and in the domain of deep surface erosion submarine. The most important of these discontinuities, by its magnitude and duration, has been called 'the Paleocene Discontinuidad East' and has a special interest, both because of its significance for genetic its usefulness as a mapping and correlation, and has improved noticeably representation Mapping of succession studied. The evolution of paleogeográfica study area has been synthesized through the construcicón maps paleogeográficas for depositional sequences. This synthesis has shown a shift to the south of the depositional systems during the Paleocene and Ilerdiense lower, reflecting a demotion of such systems in response to changes in sea level and tectonic sinsedimentaria. We have estimated quantitatively the magnitude of fluctuations in sea level that gave rise to the depositional sequences, concluding that the changes were much more important during the Tanetiense that the Daniense, possibly because of increased climate variability. Also, it has been found that the relative rise of sea level for the entire interval studied was 140 m. The comparison of these changes in sea level with those described in other basins and the Atlantic Tethys suggests the existence of a strong eustática, although more data are needed to validate this hypothesis. Finally, it has been deduced that in the development of the sequences also influenced climate variations and trofísmo of marine waters.