(Table 1) Spacing of diatom abundance index and opal index at ODP Site 175-1084 ...

An important discovery during Ocean Drilling Program Leg 175, when investigating the record of upwelling off Namibia, was the finding of a distinct Late Pliocene diatom maximum spanning the lower half of the Matuyama reversed polarity chron (MDM, Matuyama Diatom Maximum) and centered around 2.6-2.0...

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Bibliographic Details
Main Authors: Berger, Wolfgang H, Lange, Carina Beatriz, Pérez, M E
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
AGE
Age, minimum/young
Age, maximum/old
Diatom abundance index
Index
Composite Core
Abundance estimate
Calculated, see references
Leg175
Joides Resolution
Ocean Drilling Program ODP
Antarc*
Antarctica
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.744076
https://doi.pangaea.de/10.1594/PANGAEA.744076
Description
Summary:An important discovery during Ocean Drilling Program Leg 175, when investigating the record of upwelling off Namibia, was the finding of a distinct Late Pliocene diatom maximum spanning the lower half of the Matuyama reversed polarity chron (MDM, Matuyama Diatom Maximum) and centered around 2.6-2.0 Ma. This maximum was observed at all sites off southwestern Africa between 20°S and 30°S, and is most strongly represented in sediments of Site 1084, off Lüderitz, Namibia. The MDM is characterized by high biogenic opal content, high numbers of diatom valves, and a diatom flora rich in Southern Ocean representatives (with Thalassiothrix antarctica forming diatom mats) as well as coastal upwelling components. Before MDM time, diatoms are rare until ca. 3.6 Ma. After the MDM, in the Pleistocene, the composition of the diatom flora points to increased importance of coastal upwelling toward the present, but is accompanied by a general decrease in opal and diatom deposition. Here we present a simple conceptual model as ...

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