SEDIMENTOLOGICAL CHARACTERIZATION OF THE TUNUNK SHALE: PETROGRAPHIC AND CHEMICAL INTERPRETATION OF DEPOSITIONAL SYSTEMS FOR CRETACEOUS MUDSTONE PARASEQUENCES

Detailed stratigraphic analysis of the Early Permian (Artinskian/Kungurian) succession of the intracratonic Paraná Basin in southernmost Brazil has been applied focusing stratigraphic characterization of potential aquifers. In the study area, the counties of Candiota and Hulha Negra, in the southwestern region of Rio Grande do Sul state, the sedimentary succession (Itararé, Rio Bonito and Palermo units) is interpreted to have been formed in a shallow, wave-dominated sea, originated mainly in a mixed (tide and wave) influenced estuary setting. Four main depositional systems have been recognized: alluvial fan, fluvial-dominated delta, lagoonal estuary and barrier/shoreface. The regional correlation of the lithofacies within the different depositional systems has led to a high-resolution stratigraphic framework, with three third-order depositional sequences (i.e., unconformity-bounded depositional packages formed during a complete cycle of falling and rising base level). The main sandbodies occur within sequence 2 which is formed by seven fouthorder parasequences, and at the base of the third sequence. Under the viewpoint of groundwater prospecting, the best sandbodies occur within parasequences 1,2 4 and 7. Based upon the stratigraphic characterization, optimal borehole locations are given, as well as estimatives on productive dephs and water volume.

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Depositional Architecture and Reservoir Characterization of Late Paleozoic Submarine Slope and Basin Depositional Systems--Midland and Delaware Basins, Texas: ABSTRACT

AAPG Bulletin ◽

10.1306/03b5b04c-16d1-11d7-8645000102c1865d ◽

1983 ◽

Vol 67 ◽

Author(s):

William E. Galloway

Keyword(s):

Reservoir Characterization ◽

Late Paleozoic ◽

Submarine Slope ◽

Depositional Systems ◽

Depositional Architecture

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Late Holocene coastal dynamics and relative sea-level changes in the littoral of Paraíba, northeastern Brazil

Progress in Physical Geography Earth and Environment ◽

10.1177/0309133317709744 ◽

2017 ◽

Vol 41 (4) ◽

pp. 375-392 ◽

Cited By ~ 2

Author(s):

Fabio Corrêa Alves ◽

Dilce de Fátima Rossetti

Keyword(s):

Sea Level ◽

Late Holocene ◽

Morphological Changes ◽

Northeastern Brazil ◽

Sea Level Changes ◽

Array Type ◽

Depositional Systems ◽

Coastal Deposits ◽

Shoreline Progradation

A preliminary analysis of a segment of the Paraíba littoral in northeastern Brazil revealed a prograding shoreline in a coast currently characterized by estuarine transgressive depositional systems. Detailed study of coastal geomorphology is of relevance to reconstruct the sea-level history in this shoreline. Such investigation can help improve the record of past sea-level curves of northeastern Brazil, an issue still open to debates. In this work, we explored remote sensing imagery for the geomorphological characterization of this prograding shoreline and combined this information with geological field data aiming to establish the various phases of shoreline progradation. In addition, we also analyzed the potential forcing factors responsible for the morphological changes in the eastern section of the littoral of Paraíba during the late Holocene, comparing changes with other prograding shorelines along the east coast of Brazil. Geomorphological interpretation was based on the analysis of Phased Array type L-band Synthetic Aperture Radar (PALSAR) images acquired aboard the Advanced Land Observing Satellite 1 (ALOS-1). Geological data comprised dating of sand samples by the optically stimulated luminescence (OSL) technique for the establishment of the chronological context. The coastal deposits are represented by a cuspate morphology and numerous internal beach ridges that prograded seaward from a roughly north–south trending palaeocliff. The chronological data indicate shoreline progradation during the past 2.1 ± 0.1 ka, after the mid-Holocene sea-level fall. Several prograding episodes occurred during this time, some not matching with proposed sea-level rises punctuated upon the overall fall. Together with the regional geological context of the study area, we propose that eustatic sea-level was not the only factor triggering coastal progradation in this region.

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Use of ground‐penetrating radar for 3-D sedimentological characterization of clastic reservoir analogs

Geophysics ◽

10.1190/1.1444188 ◽

1997 ◽

Vol 62 (3) ◽

pp. 786-796 ◽

Cited By ~ 57

Author(s):

George A. McMechan ◽

Gerard C. Gaynor ◽

Robert B. Szerbiak

Keyword(s):

Ground Penetrating Radar ◽

Structural Elements ◽

East Central ◽

Sedimentary Sequences ◽

Depositional Systems ◽

Ground Penetrating ◽

Clastic Reservoir

Clastic reservoir analogs based on 2-D outcrop studies provide valuable definitions of geometric and petrophysical heterogeneities at interwell scales. Integration of 3-D ground‐penetrating radar (GPR) surveys with sedimentological and stratigraphic data provides information on the internal heterogeneities of sedimentary sequences at scales that allow dissection of the 3-D anatomy of clastic depositional systems. Two 3-D GPR data volumes were acquired in the Ferron sandstone of east‐central Utah. The data show prominent lenticular features, a variety of lithologies, and structural elements such as channels and shale drapes that match well with those seen at the same stratigraphic levels in adjacent cliff faces.

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Depositional systems of the late Eocene Yolomécatl Formation, northwestern Oaxaca, southeastern Mexico: a first approach

Revista Mexicana de Ciencias Geológicas ◽

10.22201/cgeo.20072902e.2018.2.559 ◽

2018 ◽

Vol 35 (2) ◽

pp. 142-157

Author(s):

Ismael Ferrusquía-Villafranca ◽

José Ramón Torres-Hernández ◽

José E. Ruiz-González ◽

Enrique Martínez-Hernández

Keyword(s):

Tectonic Setting ◽

Late Eocene ◽

Alluvial Fans ◽

Fluvial System ◽

Federal Highway ◽

Depositional Systems ◽

Floodplain Deposits ◽

Reference Section ◽

North Latitude

The discrimination/characterization of depositional systems recorded in formal lithostratigraphic, Cenozoic, continental, epiclastic units of Mexico, is largely a pending task, notwithstanding its great academic and economic importance. Contributing to fill this gap, we present a first approach to discriminate and characterize the depositional systems of the late Eocene Yolomécatl Formation, which fills the namesake, triangle-shaped tectonic basin, and carries the southernmost Paleogene vertebrate fauna of North America. The study area lies between 17°25’–17°30’ North Latitude and 97°29’–97°36’ West Longitude, and between 2000–2500 m a.s.l.; the federal highway 125 traverses it; Santiago Yolomécatl is the main town. The Yolomécatl Formation is at least 650 m thick, although the continuous thickness measured in the principal reference section is much less (~250 m); it includes fluvial and lake depositional systems sparsely interbedded by tuff sheets (a system per se). The fluvial system consists of 1) Gmm, Gmg, Gcm lithofacies: alluvial fans and related deposits; 2) Gm, Gh, Gp, Gt, St, Sp lithofacies: channel lag deposits; 3) Sr, Sh, Sl, Fl lithofacies: floodplain deposits. The (clastic) lacustrine system includes: 1) Ll, Lsm, Lm lithofacies: offshore deposits; 2) Ll, Lsm lithofacies: playa lake and mud flats deposits. This large thickness of this unit indicates superposition of fluvial/lacustrine systems, and sparse pyroclastic emplacements that took place in a basin gradually subsiding with sedimentation, under humid to subhumid conditions, probably interrupted by seasonal dryness. Finally, the tectonic setting of the Yolomécatl Basin, indicates that its genesis and development are related to the dynamics of the regional, left-lateral strike-slip Tamazulapam fault, which is also regarded as the boundary between the Mixteca (west) and Oaxaca (east) terranes.

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