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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
Volume:
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Title: Boundary
in Southwestern Indian Ocean: ABSTRACT
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Abstract:
The Pleistocene-Holocene boundary
has been determined in deep-sea cores from the southern Mozambique Channel area of the Indian Ocean. The
boundary
, dated by radiocarbon at approximately 10,000 years B.P., is defined by changes in the relative abundance of planktonic Foraminifera. These changes reflect a warming in the Holocene of a few degrees Celsius. The temperate species Globorotalia inflata (d'Orbigny) shows a marked decrease in relative abundance in the Holocene; it comprises about 20% of the planktonic foraminiferal population below the
boundary
and only 3% or less above. Simultaneously,
End_Page 558------------------------------
the percentage of warmer water species shows an increase in the Holocene. Neogloboquadrina dutertrei (d'Orbigny) increases from about 5% of the population below the boundary
to about 15-20% above, and Pulleniatina obliquiloculata (Parker and Jones) increases from less than 1% to 10%.
There is a significant increase in the radiolarian number in sediments of the Holocene.
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