Condensed Sections: The Key to Age Determination and Correlation of Continental Margin Sequences

Loutit, T. S.; Hardenbol, Jan; Vail, Peter R.; Baum, George

doi:10.2110/pec.88.01.0183

Cited by 361 publications

(218 citation statements)

References 0 publications

Supporting

Mentioning

210

Contrasting

Unclassified

Order By: Relevance

“…The top of the glauconite in Miocene and Oligocene sequences often coincides with peak abundances of benthic foraminifers, especially Uvigerina. Peak abundances in Uvigerina are commonly associated with peaks in total organic carbon (Miller and Lohmann, 1982), which typically take place during times of maximum flooding (Loutit et al, 1988). In contrast to the Oligocene and Miocene, upper Eocene sequences contain bioturbated clay throughout with little sand.…”

Section: Methodsmentioning

confidence: 99%

Upper Eocene sequence stratigraphy and the Absecon Inlet Formation, New Jersey Coastal Plain

Browning¹,

Miller²,

Bybell³

1997

Proceedings of the Ocean Drilling Program, 150X Scientific Results

View full text Add to dashboard Cite

We evaluate the age, benthic biofacies, and sequence stratigraphy of thick and well-recovered upper Eocene sediments from the New Jersey Coastal Plain. These strata are herein defined as a lithostratigraphic unit and named the Absecon Inlet Formation. The formation is divided into upper and lower portions. At its type locality in the Atlantic City borehole, the lower portion of the Absecon Inlet Formation consists of 171 ft (52 m) of glauconitic silts and silty clays and is assigned to calcareous nannoplankton Zone NP 19/20 (late Eocene). At the ACGS#4 borehole, the type locality for its upper portion, the formation consists of slightly sandy clays and is assigned to Zone NP 21 (late Eocene to earliest Oligocene). The continuous stratigraphic occurrence of Hantkenina spp. in these sediments is evidence of an Eocene age for the upper portion of the Absecon Inlet Formation. Benthic foraminiferal analysis reveals five biofacies in the Absecon Inlet Formation, three of which can be related to paleowater depth: a Siphonina biofacies inhabited water depths of 75 ± 25 m; a Cibicidoides biofacies inhabited water depths of 100 ± 30 m; and a Globobulimina biofacies inhabited water depths of 125 ± 30 m. In addition, a Gyroidinoides biofacies occurs only within transgressive systems tracts. A Bulimina jacksonensis biofacies is believed to be related to a circum-Atlantic paleoceanographic event unrelated to depth changes on the shelf. Gamma-log, lithologic, and faunal/floral data are used to interpret the sequence stratigraphic architecture of the Absecon Inlet Formation. We conclude that the timing of unconformities (sequence boundaries) and maximum flooding surfaces within the Absecon Inlet Formation is consistent with the eustatic record of Exxon and the global δ 18 O record.

show abstract

Section: Methodsmentioning

confidence: 99%

Upper Eocene sequence stratigraphy and the Absecon Inlet Formation, New Jersey Coastal Plain

Browning¹,

Miller²,

Bybell³

1997

Proceedings of the Ocean Drilling Program, 150X Scientific Results

View full text Add to dashboard Cite

show abstract

“…Glauconitization is one of the key characteristics of condensed zone sediments and can thereby be considered as typical of transgressive systems tracts ( [Loutit et al, 1988], [Haq, 1991], [Amorosi, 1995], , [Amorosi and Centineo, 1997] and [Kitamura, 1998]). In the Deoland Formation it has, indeed, according to widely accepted palaeoenvironmental models, taken place within a TST, but in the Chorhat Sandstone…”

Section: Origin Of the 'Glauconitic Minerals' In The Semri Groupmentioning

confidence: 99%

Mg-rich ferric illite in marine transgressive and highstand systems tracts: Examples from the Paleoproterozoic Semri Group, central India

Banerjee

Jeevankumar

Eriksson

2008

Precambrian Research

View full text Add to dashboard Cite

This paper focusses upon two glauconitic sandstones in the Paleoproterozoic Deoland Formation and Chorhat Sandstone, both belonging to the Semri Group, central India. In both the cases glauconitic minerals occur in sandstones deposited in the marine realm, within a transgressive systems tract (TST) for the former unit and within a highstand systems tract (HST) for the latter. The proportion of glauconitic minerals increases in the paleo-offshore direction. Petrography reveals selective early glauconitization of detrital K-feldspars along their fringes, cleavages and the fractures created by volume expansion during progressive alteration, leading to the generation of peloids with small relics of the precursors. XRD and mineral chemistry reveal a structure typical of glauconite, and more akin to Mg-rich ferric illite. The mineral chemistry of the glauconitic mineral phases remains the same whether the glauconitization process was incipient or at an advanced stage.These findings contrast with the previously held belief that ferric illite is confined to terrestrial or marginal marine sediments, and concurs with recent observations that the mineral can form in the open sea, but with high Mg. Since there are no ferro-magnesian minerals in association with these Vindhyan glauconitic sandstones, the seawater appears

show abstract

“…These beds can be easily identified by the presence of hard-grounds, omission stratigraphic surfaces (reflecting the lack of sedimentation), high concentration of planktic and benthic fossils (which may constitute mixed assemblages with fossils from two or more biozones), authigenic minerals (glauconite, phosphorite, siderite) which sometimes form crusts, intensive bioturbation, organic matter and concentrations of the platinum group elements such as iridium, etc. (Vail et al, 1987Loutit et al, 1988;Van Wagoner et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…Due to this supposed ease of recognition, condensed sections are one of the most sought-after features in the field by geologists (Doglioni et al,identification of depositional sequences and they play an important role in stratigraphic correlation at a regional as well as at a global scale (Haq et al, 1988;Loutit et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Condensation processes in shallow platforms

Gómez¹,

Fernández-López

1994

Sedimentary Geology

View full text Add to dashboard Cite

Sequence stratigraphy allows elucidation of the time-space relationships of deposits in sedimentary basins. However, the relative distribution of unconformities and condensed sections can neither be used as diagnostic criteria for particular palaeogeographic settings, nor as indicators of maximum regional transgressions. Condensation processes also occur in the shallowest portions of platforms and during maximum regression episodes. Three separate processes of condensation are here distinguished: stratigraphic, sedimentary and taphonomic. These three categories of condensation can be used to analyze patterns of sediment distribution, and also to estimate lateral and vertical variations in sedimentation rates. Contrary to the usual interpretation, the maximum values of rate of sedimentation and degree of accommodation of sediments, as well as the highest relative sea level, occur in the lowest levels of the shallowing-upward sequences. The distinction between these condensation processes allows one to predict that the degree of sedimentary and stratigraphic condensation will be higher towards the distal portions of the platforms, whereas the stratigraphic condensation processes without sedimentary condensation will show the maximum intensity and frequency in the shallowest portions of the platforms.

show abstract

Condensed Sections: The Key to Age Determination and Correlation of Continental Margin Sequences

Cited by 361 publications

References 0 publications

Upper Eocene sequence stratigraphy and the Absecon Inlet Formation, New Jersey Coastal Plain

Upper Eocene sequence stratigraphy and the Absecon Inlet Formation, New Jersey Coastal Plain

Mg-rich ferric illite in marine transgressive and highstand systems tracts: Examples from the Paleoproterozoic Semri Group, central India

Condensation processes in shallow platforms

Contact Info

Product

Resources

About