Showing papers by "Wolfgang H Berger published in 1977"
TL;DR: The aragonite compensation depth fluctuated considerably during the last 20,000 yr. This fluctuation culminated in a preservation spike at about 14,000 yr BP as discussed by the authors, and constitutes part of a worldwide phenomenon signalling considerable changes in ocean chemistry and providing a useful tool for correlation.
Abstract: The aragonite compensation depth fluctuated considerably during the last 20,000 yr. This fluctuation culminated in a preservation spike at about 14,000 yr BP. The aragonite preservation stratigraphy parallels that in calcitic foraminifera, and constitutes part of a worldwide phenomenon signalling considerable changes in ocean chemistry and providing a useful tool for correlation.
161 citations
TL;DR: The oxygen and carbon isotopic signals of planktonic Foraminifera from closely spaced samples from two box cores taken in the western equatorial Pacific change through the glacial-to-Holocene transition as a result of several factors, one of which is the Holocene dissolution pulse starting about 12,000 years ago and reaching full force shortly after.
Abstract: The oxygen and carbon isotopic signals of planktonic Foraminifera from closely spaced samples from two box cores taken in the western equatorial Pacific change through the glacial-to-Holocene transition as a result of several factors, one of which is the Holocene dissolution pulse starting about 12,000 years ago and reaching full force shortly after. The onset of dissolution comes shortly after the maximum rate of deglaciation but well before the maximum drop in fertility in upper waters. The effect of dissolution is 20 to 30 percent of the amplitude of isotopic change in Globigerinoides sacculifer, at the depth of the present lysocline.
146 citations
TL;DR: The Berger-Heath model of vertical mixing in deep-sea sediments provides a simple means of simulating an original input signal by unmixing a signal found in deepsea cores as mentioned in this paper.
Abstract: The Berger–Heath model of vertical mixing in deep-sea sediments provides a simple means of simulating an original input signal by ‘unmixing’ a signal found in deep-sea cores. When applied to an oxygen isotope record from the western equatorial Pacific, the possibility emerges that the entire ocean was covered by a low salinity water layer, during deglaciation.
90 citations
TL;DR: The physical properties of calcareous ooze are not significantly affected by any reprecipitation or incipient cementation of calcite that may occur soon after deposition as mentioned in this paper.
82 citations
01 Jan 1977
55 citations
15 Mar 1977
29 citations
TL;DR: In this article, a verfahren zur standardisierung of Artefakt-Typs entwickelt is described, in which the Gewicht eines Typs (TG) wird fiber die jeweilige Dichte auf den Durchmessers einer volumengleichen Kugel transformiert.
Abstract: Im Rahmen eines Forschungsvorhabens fiber die Evolution der Pal/iotechnik [1] wurde ein Verfahren zur Standardisierung yon Artefakten entwickelt. Das Gewicht eines Artefakt-Typs (TG) wird fiber die jeweilige Dichte auf den Durchmesser einer volumengleichen Kugel transformiert. Solche Werte sind nach der Gleichung y = ae -bx~ normalverteilt und dadurch .den Rechnungen und Tests der mathematischen Statistik zug~nglich. An Serien mit hohen Stfickzahlen aus Olduvai, Tansania, Fundstelle BK II (oberes bed II), die nach [2] vorzugsweise ein ,,Developed Olduwan B" enthalten, konnte nach unserer Methode erstmals die Standardisierung frfiher menschlicher Artefakte exakt bestimmt werden [3]. Als Parameter dienen die aus dem Typengewicht TG transformierten Lokalisationsmage ~ und 2 des Kugeldurchmessers sowie die Dispersionsmal3e Varianz und Standardabweichung s. In Figur 1 umschliel3t der Kurvenzug A alle Grenzwerte des gesamten Artefakt-Ensembles, also Werkzeuge der verschiedenen Typen, Abschl~ge und Kernsteine einschlieBlich der benutzten Kernsteine. Alle Typen sind wenn auch verschieden hoch standardisiert. Ihre Fertigung war deutlich institutionalisiert. Die geringste Standardabweichung zeigen die Werkzeuge des
6 citations