scholarly journals Towards an integrated stratigraphy of the Gramame Formation (Maastrichtian), CIPASA quarry, Pernambuco-Paraíba Basin, NE Brazil

2006 ◽  
Vol 29 (1) ◽  
pp. 81-94
Author(s):  
Francisco Henrique de Oliveira Lima ◽  
Eduardo A. M Koutsoukos
Keyword(s):  
Order Type ◽  
Passive Margin ◽  
Northeastern Brazil ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Warm Climate ◽  
Third Order ◽  
Transgressive System Tract ◽  
System Tract ◽  
Integrated Stratigraphy

This study presents the integrated biostratigraphic (calcareous nannofossils and foraminifera), petrographic, geochemical and ichnological analyzes of the Gramame Formation (Maastrichtian) at the CIPASA Quarry section, in the Pernambuco-Paraíba Basin, northeastern Brazil. A high resolution calcareous nannofossil biostratigraphic study has been carried out, allowing to subdivide the studied section into three subzones of Maastrichtian age: CC25A, CC25B, and CC25C. Each biostratigraphic unit was further characterized by petrographic, geochemical and ichnological parameters. During the Maastrichtian the area was characterized by a dry and warm climate with low influx of terrigenous sediments. These conditions were fundamental to the widespread development of a carbonate ramp system in an outer neritic to bathyal setting, with deposition of alternating calcareous mudstones and argillaceous mudstones of the Gramame Formation. The Gramame Formation belongs to the transgressive system tract of second-order type, characteristic of a Passive Margin Sequence. The studied section consists of part of a third order deposicional cycle, which is arranged in a transgressive systems tract and a highstand systems tract. The lowstand systems tract was not characterized.

KAJIAN HUBUNGAN DIAGENESIS DAN SIKUEN STRATIGRAFI FORMASI NANGGULAN BERDASARKAN ANALISIS PETROGRAFI BATUPASIR

KURVATEK ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 71-82
Author(s):  
Wahyu Sasongko
Keyword(s):  
Transgressive System Tract ◽  
Highstand System Tract ◽  
System Tract

Proses diagenesis yang terjadi pada batuan memiliki hubungan yang erat dengan konsep sikuen stratigrafi. Proses diagenesis awal (eogenesis) yang terbentuk pada suatu batuan dipengaruhi oleh posisi stratigrafi batuan tersebut dalam tataan sikuen stratigrafi. Eogenesis tersebut dapat diteliti dengan menggunakan data petrografi batupasir mengenai proses diagenesis yang terdapat pada batuan, dan juga dengan melihat posisi batuan dalam tataan sikuen stratigrafi. Formasi Nanggulan yang tersingkap di Kulon Progo, Yogyakarta merupakan salah satu formasi yang dengan beberapa interval litologi batupasir. Analisis mengenai sikuen stratigrafi Formasi Nanggulan telah diteliti sebelumnya dengan menggunakan analisis batuan inti. Studi lebih lanjut mengenai Formasi Nanggulan bertujuan untuk mengetahui karakteristik batupasir dan proses diagenesisnya, serta mencari hubungan antara proses diagenesis dan sikuen stratigrafi. Penelitian dilakukan dengan menggunakan analisis petrografi dari data batuan inti dan singkapan permukaan dengan tujuan untuk mengetahui hubungan antara diagenesis dan sikuen stratigrafi pada batupasir Formasi Nanggulan.Berdasarkan analisis petrografi terhadap diagenesis pada Formasi Nanggulan, dapat dikonfirmasi bahwa Formasi Nanggulan terdiri dari 3 system tract yaitu lowstand system tract (LST), transgressive system tract (TST), dan highstand system tract (HST). Tahapan proses diagenesis yaitu eogenesis, mesogenesis dan telogenesis telah mempengaruhi Formasi Nanggulan. Karakteristik diagenesis pada Formasi Nanggulan bervariasi sesuai dengan system tract dan marker batas sikuen pada tataan sikuen stratigrafi. Berdasaran penelitian ini dapat diketahui bahwa sikuen stratigrafi Formasi Nanggulan dapat dikonfirmasi dengan data diagenesis.

scholarly journals High resolution integrated microbiostratigraphy of the Lower Jurassic (late Pliensbachian–early Toarcian) of central Italy

1998 ◽  
Vol 17 (2) ◽  
pp. 153-172 ◽  
Author(s):  
Raffaella Bucefalo Palliani ◽  
Emanuela Mattioli
Keyword(s):  
High Resolution ◽  
Evolutionary History ◽  
Central Italy ◽  
Lower Jurassic ◽  
High Potential ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Dinoflagellate Cyst ◽  
History Of ◽  
Global Events

Abstract. The integrated use of calcareous nannofossil and dinoflagellate cyst events in a study of the late Pliensbachian–early Toarcian interval in central Italy has yielded a high resolution biostratigraphy. The use of both the first and last occurrences of selected taxa belonging to the two phytoplankton groups allows the dating of the sediments with a very refined detail, even when lithologies are unfavourable to the preservation of one fossil group. The evolutionary history of calcareous nannofossils and dinoflagellate cysts during the early Jurassic and its links with global events are responsible for the high potential of this integrated biostratigraphy.

scholarly journals The calcareous nannofossil <i>Prinsiosphaera</i> achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the δ<sup>13</sup>C of bulk carbonate

2013 ◽  
Vol 10 (5) ◽  
pp. 7989-8025 ◽  
Author(s):  
N. Preto ◽  
C. Agnini ◽  
M. Rigo ◽  
M. Sprovieri ◽  
H. Westphal
Keyword(s):  
Global Ocean ◽  
Late Triassic ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Western Tethys ◽  
Carbonate Sedimentation ◽  
History Of ◽  
Calcareous Plankton ◽  
Inorganic Carbon Cycle

Abstract. The onset of pelagic biomineralization marked a milestone in the history of the long term inorganic carbon cycle: as soon as calcareous nannofossils became major limestone producers, the pH and supersaturation state of the global ocean were stabilized (the so-called Mid Mesozoic Revolution). But although it is known that calcareous nannofossils were abundant already by the end of the Triassic, no estimates exist on their contribution to hemipelagic carbonate sedimentation. With this work, we estimate the volume proportion of Prinsiosphaera, the dominant Late Triassic calcareous nannofossil, in hemipelagic and pelagic carbonates of western Tethys. The investigated Upper Triassic lime mudstones are composed essentially of microspar and tests of calcareous nannofossils, plus minor bioclasts. Prinsiosphaera became a significant component of lime mudstones since the late Norian, and was contributing up to ca. 60% of the carbonate by the late Rhaetian in periplatform environments with hemipelagic sedimentation. The increasing proportion of Prinsiosphaera in upper Rhaetian hemipelagic lime mudstones is paralleled by a increase of the δ13C of bulk carbonate. We interpreted this isotopic trend as related to the diagenesis of microspar, which incorporated respired organic carbon with a low δ13C when it formed during shallow burial. As the proportion of nannofossil tests increased, the contribution of microspar with low δ13C diminished, determining the isotopic trend. We suggest that a similar diagenetic effect may be observed in many Mesozoic limestones with a significant, but not yet dominant, proportion of calcareous plankton.

Paleocene calcareous nannofossils biostratigraphy from the Sergipe Sub-basin, northeastern Brazil: Implications for this depositional environment

2018 ◽  
Vol 82 ◽  
pp. 1-15 ◽  
Author(s):  
Geize Carolinne Correia Andrade Oliveira ◽  
Rick Souza de Oliveira ◽  
Rodrigo Monte Guerra ◽  
Mario Ferreira de Lima Filho
Keyword(s):  
Depositional Environment ◽  
Northeastern Brazil ◽  
Calcareous Nannofossils

Middle Miocene planktonic microfossils and lower bathyal foraminifera from offshore southern California

1986 ◽  
Vol 60 (2) ◽  
pp. 249-267
Author(s):  
Ted F. W. Bergen ◽  
Joanne Sblendorio-Levy ◽  
John T. Twining ◽  
Richard E. Casey
Keyword(s):  
New Species ◽  
New Taxa ◽  
Benthic Foraminifera ◽  
Southern California ◽  
Middle Miocene ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
New Subspecies ◽  
Submarine Ridge ◽  
Age Range

Lower bathyal sediments representing portions of the Luisian and Mohnian stages of Kleinpell (1938) occur on a submarine ridge near Tanner Bank, offshore southern California. The presence of abundant and well-preserved calcareous nannofossils, diatoms, silicoflagellates, radiolarians and foraminifera allows accurate correlations with the onshore type sections of these stages. In terms of the calcareous nannofossil zones, the age range is from the Sphenolithus heteromorphus Zone to the Discoaster kugleri Zone. Although abundant benthic foraminifera indicative of the Luisian and Mohnian are present, they are accompanied by species more characteristic of the Pliocene Repettian Stage of Natland (1952) and the Pliocene-Miocene “Delmontian” Stage of Kleinpell (1938). Many of these latter species live today at lower bathyal depths (below 2,000 m), others occur in lower bathyal sediments as old as Oligocene, but are absent in the onshore type sections of the Luisian and Mohnian stages in coastal California. We ascribe their absence in onshore sequences to deposition at middle bathyal depths. The known chronostratigraphic ranges of several species are extended and five new species and two new subspecies of benthic foraminifera are described.The following new taxa are described: Bolivina pelita n. sp., Cassidulinella inflata n. sp., Globocassidulina undulata n. sp., Cibicidoides mckannai miocenicus n. subsp., C. mckannai sigmosuturalis n. subsp., Pullenia fragilis n. sp., Parafissurina inornata n. sp.

Calcareous nannofossils from the uppermost Oxfordian and lowermost Kimmeridgian of Staffin Bay, Isle of Skye, northern Scotland

2018 ◽  
Vol XV (1) ◽  
pp. 63-72
Author(s):  
Maria A. USTINOVA
Keyword(s):  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Northern European ◽  
Isle Of Skye

Twenty six samples from the sections at Flodigarry and Digg at Staffin Bay, Isle of Skye, northern Scotland, spanning the stratigraphical interval from the uppermost Oxfordian to the lowermost Kimmeridgian were examined for their calcareous nannofossil content. The study revealed the presence of an assemblage typical of the nannofossil zone NJ15 of the northern European zonation.

Sequence stratigraphy of the lacustrine rift basin in the Paleogene system of the Bohai Sea area: Architecture mode, deposition filling pattern, and response to tectonic rifting processes

2020 ◽  
Vol 8 (2) ◽  
pp. SF57-SF79
Author(s):  
Changgui Xu ◽  
Lu Huan ◽  
Song Zhangqiang ◽  
Jia Donghui
Keyword(s):  
Bohai Sea ◽  
Rift Basin ◽  
Third Order ◽  
Sequence Stratigraphic ◽  
The Bohai Sea ◽  
Stratigraphic Model ◽  
Architectural Patterns ◽  
Sequence Boundaries ◽  
Sea Area ◽  
System Tract

The Bohai Sea area is a complex lacustrine rift basin characterized by multistage rifts, polycycle superimpositions, and multiple genetic mechanisms. We recognized three types of sequence boundaries from the Paleogene strata of offshore Bohai, including 2 first-, 3 second-, and 10 third-order sequence boundaries. The third-order wedges, composed of the low-stand system tract (LST), lake expansion system tract (EST), and high-stand system tract (HST), are significant for hydrocarbon exploration. The sequence stratigraphic patterns vary in different periods. We discovered that the LST and EST are mainly developed in the rifting stage, whereas the HST is developed in the subsidence stage. Sequences developed in different depressions present significant variations, but the migration of the depocenter from the margin to the center during basin evolution can still be clearly recognized. Vertically, episodic tectonism plays an important role in controlling the formation of sequence boundaries, sequence structural features, and sequence architectural patterns. However, various rift basin marginal tectonics control the lateral sequence architectures. Because each structure belt is characterized by a unique sequence framework due to the strong influence of basin rifting processes, we establish a corresponding sequence stratigraphic model for the specific tectonic environment using process-based sequence stratigraphic methods.

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