By D. Kroon, R. D. Norris, A. Klaus
ISBN-10: 1862390789
ISBN-13: 9781862390782
Palaeogene and Cretaceous palaeoceaongraphy has been the focal point of extreme overseas curiosity within the previous couple of years, spurred through deep ocean drilling at Blake nostril within the North Atlantic in addition to the necessity to use previous weather switch as enter for modelling destiny weather switch. This ebook brings jointly a couple of assessment papers that describe old oceans and special occasions within the Earth's climatic historical past and evolution of biota. The papers express facts of sessions characterized through extraordinary worldwide heat similar to past due Palaeocene Thermal greatest and Cretaceous anoxic occasions. Geochemical files and modelling will make the reader acutely aware that those classes have been pressured through greenhouse gases. this data is key for figuring out the reaction of the ocean-climate process to the present enter of fossil fuels. during this feel, the booklet contributes to the knowledge of basic facets of Earth's weather, the carbon cycle, and marine ecosystems. a couple of papers describe mammoth mass losing deposits caused by strength published by means of the bolide influence on the Cretaceous-Tertiary boundary in addition to the geochemistry of the boundary itself. extra papers hide points of cyclostratigraphy and biostratigraphy of Palaeogene and Cretaceous documents. Readership:Earth Scientists drawn to Palaeogene-Cretaceous palaeoceanography, severe weather modelling, Cretaceous-Tertiary boundary, overdue Palaeocene Thermal greatest, Cretaceous anoxic occasions, in addition to these particularly attracted to radiolarian, dinoflagellate and coccolithophorid stratigraphy.
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Extra info for Western North Atlantic Palaeogene and Cretaceous Palaeoceanography
Sample text
D. NORRIS ET AL. Ever since the development of seismic profiling for correlation of deep-sea deposits, it has been recognized that there are widespread, smooth reflectors in the deep North Atlantic basins. Ewing & Ewing (1963) designated one of the more prominent horizons Horizon 'A' and suggested that it represents a sequence of turbidites. Subsequently, various refinements of Atlantic acoustic stratigraphy were made, including recognition of a reflector that apparently represented sediments filling in lows over ocean crust (Horizon P), and a number of subdivisions of the 'A' reflector (Fig.
The LPTM is recognized at Site 1051 by a c. 2%0 decrease in the 513C of bulk carbonate, a c. 3%o decrease in the 13C of planktonic foraminifera, and the presence of the 'excursion fauna' of planktonic foraminifera, including species such as Acarininia africana and Morozovella allisonensis, which are closely associated with the LPTM in the Pacific and Tethys (Norris & Rohl, 1999). Katz et al. (1999) have shown that the LPTM at Site 1051 is also associated with a c. 3%o decrease in benthic foraminifer 13C and the last occurrence of CONTINENTAL SLOPE MASS WASTING several species of benthic foraminifera, as well as a distinctive chalk breccia.
1966). Erosion of the base of the Blake Escarpment occurred during Oligocene time as well. The northern side of Blake Nose is a relatively gentle ramp. Gently dipping Cretaceous rocks that make up most of the platform are truncated and overlapped by a veneer of Palaeogene strata. In contrast, the southeastern side of Blake Nose features well-preserved slump blocks that are not overlapped by younger pelagic sediments (EEZScan 87 Scientific Staff 1991). Strata on top of Blake Nose terminate abruptly at the southeastern escarpment without obvious thinning or pinch-outs.
Western North Atlantic Palaeogene and Cretaceous Palaeoceanography by D. Kroon, R. D. Norris, A. Klaus
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