Anoxic events in the Cretaceous ocean
نویسندگان
چکیده
منابع مشابه
Oceanic oxygenation events in the anoxic Ediacaran ocean.
The ocean-atmosphere system is typically envisioned to have gone through a unidirectional oxygenation with significant oxygen increases in the earliest (ca. 635 Ma), middle (ca. 580 Ma), or late (ca. 560 Ma) Ediacaran Period. However, temporally discontinuous geochemical data and the patchy metazoan fossil record have been inadequate to chart the details of Ediacaran ocean oxygenation, raising ...
متن کاملRecord bio-events and study the distribution of calcareous nannofossils in Cretaceous-Paleogene sediments, Neo-Tethys Ocean realm
In the present study, the sediments of the Gurpi Formation in the Jafarabad section located in the southeast of Ilam were examined from the point of view of calcareous calcareous nannofossils. The sediments of the upper part of Gurpi Formation with a thickness of about 42 m are composed of limy marl sediments. In this study, 34 species belonging to 22 genera from the group of calcareous nannopl...
متن کاملRecord bio-events and study the distribution of calcareous nannofossils in Cretaceous-Paleogene sediments, Neo-Tethys Ocean realm
In the present study, the sediments of the Gurpi Formation in the Jafarabad section located in the southeast of Ilam were examined from the point of view of calcareous calcareous nannofossils. The sediments of the upper part of Gurpi Formation with a thickness of about 42 m are composed of limy marl sediments. In this study, 34 species belonging to 22 genera from the group of calcareous nannopl...
متن کاملSeawater Strontium Isotopes, Oceanic Anoxic Events, and Seafloor Hydrothermal Activity in the Jurassic and Cretaceous
There were three negative seawater strontium-isotope excursions (shifts to lower Sr/Sr values) during the Jurassic and Cretaceous that were of relatively short duration (5-13 my) and showed a relatively quick recovery to pre-excursion Sr/Sr ratios. These excursions occurred in the Pliensbachian-Toarcian (Early Jurassic), Aptian-Albian, and Cenomanian-Santonian (Early and Late Cretaceous respect...
متن کاملOceanic anoxic events and plankton evolution: Biotic response to tectonic forcing during the mid-Cretaceous
[1] Mid-Cretaceous (Barremian-Turonian) plankton preserved in deep-sea marl, organic-rich shale, and pelagic carbonate hold an important record of how the marine biosphere responded to shortand long-term changes in the ocean-climate system. Oceanic anoxic events (OAEs) were short-lived episodes of organic carbon burial that are distinguished by their widespread distribution as discrete beds of ...
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ژورنال
عنوان ژورنال: Nature
سال: 1977
ISSN: 0028-0836,1476-4687
DOI: 10.1038/268015a0