Topic
Neogene
About: Neogene is a research topic. Over the lifetime, 7088 publications have been published within this topic receiving 210714 citations. The topic is also known as: Neogene period.
Papers published on a yearly basis
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Papers
TL;DR: The detailed texture and geochemistry of these glauconite-phosphorite grains are reported in this article within the stratigraphic framework established on the outer continental shelf in the Head of the Cape Canyon area.
Abstract: Glauconite and carbonate–fluorapatite (CFA) are significant components of the condensed Upper Oligocene to Holocene sediment succession recovered from the western margin of southern Africa. The detailed texture and geochemistry of these glauconite–phosphorite grains are reported here within the stratigraphic framework established on the outer continental shelf in the Head of the Cape Canyon area. Three texturally and stratigraphically distinct glauconite grain types are recognised: Oligo/Miocene infilled foraminiferal tests, Mio/Pliocene green and Quaternary dark green to black grains. Most of these glauconitic grains include a minor to significant amount of CFA. The Upper Oligocene to Lower Miocene sediment succession is dominated by fine sand-sized benthic and planktic foraminifera. Glauconite grains constitute 20–50% of the sediment and represent tests infilled by variable proportions of glauconite and CFA cement with the test wall replaced by CFA only. Glauconite–CFA formation during the Late Oligocene to Early Miocene was associated with warm-water upwelling coupled with third-order marine transgressions. Rare-earth element (REE) chemistry indicates that sub-oxic conditions prevailed during diagenesis. Mio/Pliocene green and Quaternary dark green to black medium sand-sized glauconite grains constitute between 20% and 95% of these predominantly siliciclastic sediments. The green to black glauconite grains are texturally different, but have similar major and REE chemistry. Since the mid-Miocene, formation of glauconite–CFA grains is associated with cold-water upwelling and detrital, Fe-rich terrigenous mud deposition in oxic to suboxic bottom waters analogous to the Holocene coast-parallel, organic-rich mudbelt on the shelf. The texture of these grains indicates repeated cycles of glauconite and CFA authigenesis during marine transgressions and winnowing and reworking during marine regressions.
53 citations
1 Sep 1998
TL;DR: In this article, the surface and near-surface paleotemperatures of the high and low latitudes in the North Atlantic and North Pacific were evaluated for several Neogene-Quaternary time-slices, and the deep sea drilling core samples and published data of the Deep Sea Drilling Project and Ocean Drilling Program serve as the bases for the study.
Abstract: The deep sea drilling core samples and published data of the Deep Sea Drilling Project and Ocean Drilling Program serve as the bases for this study. Original methods for paleotemperature interpretation of foraminiferal and oxygen isotopic data are suggested. For several Neogene–Quaternary time-slices, the surface and near-surface paleotemperatures of the high and low latitudes in the North Atlantic and North Pacific are evaluated. During the Neogene, the `Pole–Equator' gradient of the surface water mass at different depths tended to increase. It increased by 8°C at the oceanic surface, by 11.5°C at the depth of 50 m, by 15.5°C at the depth of 100 m and by 11.5°C at the depth of 200 m. This is related to the progressive cooling in the high latitudes during Neogene–Quaternary. Maximum gradient variations are observed at the depth of 100 m resulting from thermocline onset and evolution. Our data suggest that the first sharp increase of gradient by 4–6°C occurs between 10–5 Ma, and the second one (also 4–5°C) during the Middle–Late Pliocene. These abrupt changes correspond to the intensification of the oceanic circulation caused by the evolution of Neogene glaciation. In the Quaternary, the temperature gradient slightly decreased. During the Last Glacial maximum, the gradient was less than those observed during the Last Interglacial optimum and now.
53 citations
TL;DR: The new remains reported here, from an endemic insular fauna from southern Italy, Late Messinian to earliest Pliocene in age, represent the youngest European crocodylian and allow, for the first time, an unambiguous demonstration that Crocodylus dispersed into Europe, possibly during the Tortonian.
53 citations
University of Oxford1, United States Geological Survey2, North Dakota State University3, Ohio State University4, Victoria University of Wellington5, Florida State University6, Delft University of Technology7, Ames Research Center8, Russian Academy of Sciences9, University of Nebraska–Lincoln10, University of Glasgow11, Indiana University – Purdue University Indianapolis12, Northern Illinois University13, Stockholm University14, Queen Mary University of London15, Cornell University16
TL;DR: In this article, the authors obtained four shallow cores (COMRAC 8, 9, 10 and 11) from beneath the permafrost boundary in the Mount Feather Diamicton in order to understand its origin and relationship with the surrounding landscape Detailed studies of these cores (stratigraphy, sedimentology, palaeontology, microfossils, micromorphology, petrography and fabric) have yielded new data that demonstrate a much more complex climatic and glacial history.
53 citations
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Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 111 |
| 2024 | 242 |
| 2023 | 338 |
| 2022 | 423 |
| 2021 | 175 |
| 2020 | 218 |