Calcareous nannofossil abundance and datums of ODP Leg 189 sites

Quaternary sediments were recovered at all five sites drilled during Ocean Drilling Program (ODP) Leg 189 in the Tasmanian Gateway. Two of these sites lie north of the present-day Subtropical Front (STF), and three sites lie south of the STF. Quaternary sediments recovered at Sites 1168, 1170, 1171,...

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Bibliographic Details
Main Authors: Stant, S Audra, Lara, Jonathan, McGonigal, Kristeen L, Ladner, Bryan
Format: Other/Unknown Material
Language:English
Published: PANGAEA 2004
Subjects:
189-1168A
189-1170A
189-1171A
189-1171C
189-1172A
189-1172B
DRILL
Drilling/drill rig
Indian Ocean
Joides Resolution
Leg189
Ocean Drilling Program
ODP
South Pacific Ocean
Tasman Sea
Antarc*
Antarctica
Prydz Bay
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.780093
https://doi.org/10.1594/PANGAEA.780093
Description
Summary:Quaternary sediments were recovered at all five sites drilled during Ocean Drilling Program (ODP) Leg 189 in the Tasmanian Gateway. Two of these sites lie north of the present-day Subtropical Front (STF), and three sites lie south of the STF. Quaternary sediments recovered at Sites 1168, 1170, 1171, and 1172 were studied in detail to determine the calcareous nannofossil biostratigraphy and construct an age model for these sediments. The Pliocene/Pleistocene boundary was identified by the last occurrence (LO) of Discoaster brouweri at Site 1172 and approximated by the LO of Calcidiscus macintyrei at the other sites because of a lack of discoasterids. A hiatus encompassing the entire Helicosphaera sellii Zone was tentatively identified at Sites 1168 and 1172 by the coincident LOs of C. macintyrei and H. sellii. Similar hiatuses have been noted at ODP Site 1127 on the Great Australian Bight, Deep Sea Drilling Project Site 282 off the Tasman subcontinent, and ODP Site 1165 in Prydz Bay, Antarctica.

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