Evolution of shallow and deep-water deposits included in the regressive drift succession of the potiguar basin (Brazilian Equatorial Margin) during the Late Cretaceous to Holocene

<p>The Brazilian Continental Margin (BEM) deep-water regions contain important geological features that need advance in their characterization. Mass-transport deposits (MTD) are important not only by their significance in the sedimentary but also because of their negative impact economically. A slump is a coherent mass of sediment that moves on a concave-up glide plane and undergoes rotational movements causing internal deformation and one of the basic types of MTD. The study area comprises part of the offshore Potiguar Basin in NE Brazil, on the distal eastern portion of the Touros High and Fernando de Noronha Ridge. This portion of the Potiguar Basin comprises a transform rift system that has evolved into a continental passive margin. This basin represents an important location related to the breakup between South America and Africa. The database used in this work included 2D post-stack time-migrated seismic profiles from the Brazilian Agency of Petroleum, Natural Gas, and Biofuels (ANP). The slumps reflectors are identified on the continental shelf profiles in form of present clinoform configuration, medium to high continuity, high amplitudes, and medium to high frequencies, representing a sigmoidal oblique complex prograding reflector. The slump scars at the continental slope indicate that this is a gravitationally unstable area that will eventually collapse, resulting in erosional features on the continental slope and deposition on the continental rise. Our results provide some insights regarding MDT slumps sedimentary evolution in the BEM deep water area as well as their interrelation with other sedimentary deposits.</p>

Download Full-text

The Mossoró Sandstone, Canto do Amaro Oil Field, Late Cretaceous of the Potiguar Basin, Brazil: An Example of a Tidal Inlet-Channel Reservoir

Frontiers in Sedimentary Geology - Marine Clastic Reservoirs ◽

10.1007/978-1-4757-0160-9_9 ◽

1993 ◽

pp. 183-199

Author(s):

Eduardo Bagnoli

Keyword(s):

Late Cretaceous ◽

Tidal Inlet ◽

Oil Field ◽

Inlet Channel ◽

Potiguar Basin

Download Full-text

The Cretaceous crinoid Uintacrinus socialis from Jamaica and its significance for global correlation

Geological Magazine ◽

10.1017/s0016756809990549 ◽

2009 ◽

Vol 146 (6) ◽

pp. 937-940 ◽

Cited By ~ 4

Author(s):

SIMON F. MITCHELL

Keyword(s):

Late Cretaceous ◽

Deep Water ◽

First Record ◽

North Coast ◽

Caribbean Region ◽

Latitudinal Distribution ◽

The North ◽

Global Correlation ◽

Potential Marker ◽

The Caribbean

AbstractThe late Cretaceous crinoid Uintacrinus socialis Grinnell, which is a potential marker for the base of the Upper Santonian Substage, is reported from the Inoceramus Shales of St Ann's Great River Inlier on the north coast of Jamaica. This is the first record of this species from the Caribbean region and marks its lowest latitudinal distribution reported to date. The Inoceramus Shales are a deep-water clastic mudstone unit which extends the palaeoecological distribution of this crinoid. Uintacrinus socialis proves that the Inoceramus Shales are of Santonian age and will help constrain correlations between the shallow-water platform carbonate/volcaniclastic facies found in the arc successions of the Caribbean and the international chronostratigraphy.

Download Full-text

Exploration plays of the Potiguar Basin in deep and ultra-deep water, Brazilian Equatorial Margin

Journal of South American Earth Sciences ◽

10.1016/j.jsames.2021.103454 ◽

2021 ◽

pp. 103454

Author(s):

Ediane B. da Silva ◽

Helio J.P. Severiano Ribeiro ◽

Eliane Soares de Souza

Keyword(s):

Deep Water ◽

Potiguar Basin

Download Full-text

A new species of Petalobrissus Lambert 1916 (Echinoidea: Faujasiidae) from the Jandaíra Formation, Potiguar Basin (Brazil)

Zootaxa ◽

10.11646/zootaxa.4422.4.8 ◽

2018 ◽

Vol 4422 (4) ◽

pp. 581

Author(s):

JESSIKA ALVES ◽

FELIPE A. C. MONTEIRO ◽

HELENA MATTHEWS-CASCON ◽

RODRIGO JOHNSSON ◽

ELIZABETH G. NEVES

Keyword(s):

New Species ◽

Late Cretaceous ◽

Rio Grande ◽

Identification Key ◽

Key To Species ◽

Potiguar Basin ◽

A New Species

A new Late Cretaceous species of Petalobrissus, Petalobrissus lehugueurae sp. nov., is described from the Jandaíra Formation, Potiguar Basin, state of Rio Grande do Norte. To date, this genus comprises a total of 20 species, only two of which, Petalobrissus setifensis and Petalobrissus cubensis have so far been recorded from the Jandaíra Formation. Petalobrissus lehugeurae sp. nov. is distinguished from its congeners in that gonopores occupy only a small portion of the genital plates, in having a slit-like periproct and a unique abrupt depression of the test that forms a pronounced keel below the periproct. In addition, an identification key to species of Petalobrissus is presented.

Download Full-text

Evolution of the neodymium isotopic signature of neritic seawater on a northwestern Pacific margin: new constrains on possible end-members for the composition of deep-water masses in the Late Cretaceous ocean

Chemical Geology ◽

10.1016/j.chemgeo.2013.08.008 ◽

2013 ◽

Vol 356 ◽

pp. 160-170 ◽

Cited By ~ 15

Author(s):

Mathieu Moiroud ◽

Emmanuelle Pucéat ◽

Yannick Donnadieu ◽

Germain Bayon ◽

Kazuyoshi Moriya ◽

...

Keyword(s):

Late Cretaceous ◽

Deep Water ◽

Isotopic Signature ◽

Water Masses ◽

Northwestern Pacific ◽

Pacific Margin ◽

End Members

Download Full-text

Paleogeographic controls on the evolution of Late Cretaceous ocean circulation

10.5194/cp-2019-157 ◽

2020 ◽

Author(s):

Jean-Baptiste Ladant ◽

Christopher J. Poulsen ◽

Frédéric Fluteau ◽

Clay R. Tabor ◽

Kenneth G. MacLeod ◽

...

Keyword(s):

Ocean Circulation ◽

Late Cretaceous ◽

Deep Water ◽

Climate Model ◽

Deep Water Formation ◽

Geologic History ◽

Water Formation ◽

History Of ◽

Considerable Impact ◽

Climate Model Simulations

Abstract. Understanding of the role of ocean circulation on climate during the Late Cretaceous is contingent on the ability to reconstruct its modes and evolution. Geochemical proxies used to infer modes of past circulation provide conflicting interpretations for the reorganization of the ocean circulation through the Late Cretaceous. Here, we present climate model simulations of the Cenomanian (100.5–93.9 Ma) and Maastrichtian (72.1–66.1 Ma) stages of the Cretaceous with the CCSM4 earth system model. We focus on intermediate (500–1500 m) and deep (> 1500 m) ocean circulation, and show that while there is continuous deep-water production in the southwest Pacific, major circulation changes occur between the Cenomanian and Maastrichtian. Opening of the Atlantic and Southern Ocean, in particular, drives a transition from a mostly zonal circulation to enhanced meridional exchange. Using additional experiments to test the effect of deepening of major ocean gateways in the Maastrichtian, we demonstrate that the geometry of these gateways likely had a considerable impact on ocean circulation. We further compare simulated circulation results with compilations of εNd records and show that simulated changes in Late Cretaceous ocean circulation are reasonably consistent with inferences from this proxy. In our simulations, consistency with the geologic history of major ocean gateways and absence of shift in areas of deep-water formation suggest that the Late Cretaceous trend in εNd values in the Atlantic and southern Indian Oceans was caused by the subsidence of volcanic provinces and opening of the Atlantic and Southern Oceans rather than changes in deep-water formation areas and/or reversal of deep-water fluxes. However, the complexity in interpreting Late Cretaceous εNd values underscores the need for new records as well as specific εNd modeling to better discriminate between the various plausible theories of ocean circulation change during this period.

Download Full-text