CLIMATIC ZONATION OF THE SOUTHERN HEMISPHERE IN CAMPANIAN TIME ACCORDING TO THE STUDY OF PLANKTON FORAMINIFERA

  • E. A. Sokolova Shirshov Institute of Oceanology, Russian Academy of Sciences
DOI 10.29006/1564-2291.JOR-2019.47(4).8
Keywords Late Cretaceous, Campan, foraminifera, thanatocenoses, paleotemperature, paleoclimate, climatic zonality, paleolatitudes, water masses

Abstract

In the Campanian cores of deep water drilling in the Indian Ocean, on the Falklands Plateau, in the central part of the Atlantic Ocean and in the Australian shelf seas, the systematic composition of shells of planktonic foraminifera was studied. The revealed complexes of foraminifera are attributed to one or another type of than at ocenosis. On the basis of the spatial distribution of types of tanatocenoses, maps of climatic zonality for sections of the early, middle beginning, and end of the late campaign have been constructed. Different climatic zones correspond to different types of water masses. In the southern hemisphere, there were three climatic zones, but their sizes and the outline of the boundaries changed during the Campanian period. In the early and middle campaigns, the climate was smooth and mild. The beginning of the late campaign is marked by short-term warming which was replaced by a sharp late Campan cooling. The obtained reconstructions are confirmed by our own and literary data of oxygen isotope analysis.

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Published
2019-12-01
Section
Marine geology, geophysics and geochemistry