Organic-rich sedimentation in the South Pacific Ocean associated with late Paleocene climatic cooling

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doi: 10.1016/j.earscirev.2014.03.006
Author(s): Hollis, Christopher J.; Tayler, Michael J. S.; Andrew, Benjamin; Taylor, Kyle W.; Lurcock, Pontus; Bijl, Peter K.; Kulhanek, Denise K.; Crouch, Erica M.; Nelson, Campbell S.; Pancost, Richard D.; Huber, Matthew; Wilson, Gary S.; Ventura, G. Todd; Crampton, James S.; Schioler, Poul; Phillips, Andy
Author Affiliation(s): Primary:
GNS Science, Lower Hutt, New Zealand
Other:
University of Waikato, New Zealand
University of Bristol, United Kingdom
University of Otago, New Zealand
Utrecht University, Netherlands
University of New Hampshire, United States
Volume Title: Earth-Science Reviews
Source: Earth-Science Reviews, Vol.134, p.81-97. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-8252 CODEN: ESREBW
Note: In English. Includes appendices. 143 refs.; illus., incl. sketch map
Summary: A distinctive organic-rich marine mudstone of Late Paleocene age occurs in most of New Zealand's sedimentary basins and has been identified as a potential source rock for oil and gas. Identified as the Waipawa Formation in the East Coast Basin and the Tartan Formation in the Great South and Canterbury Basins, the unit is a relatively uniform massive mudstone that varies greatly in thickness (2-70 m) and grades laterally into distinctive facies equivalents, notably greensand and a thin-bedded siliceous mudstone. All these facies are characterised by relatively high TOC (0.5-10 wt.%) and 13C enrichment (δ13CTOC>-24 ppm), and we refer to them collectively as "Waipawa organofacies". Our detailed stratigraphic and geochemical studies refine the age (58.7 to 59.4 Ma), distribution and nature of the Waipawa organofacies. We have determined that deposition occurred in continental margin settings throughout much of the southwest Pacific under cool, dysoxic conditions associated with a significant influx of terrestrial organic matter, high marine productivity, a global fall in sea level, and a regional unconformity across shallow and deep marine settings. The combination of cool temperatures, lowered sea level and bathyal erosion suggests that deposition was linked to short-lived growth of an Antarctic ice sheet in the earliest Late Paleocene (∼59 Ma). Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic ice sheet; Antarctica; Australasia; C-13/C-12; Carbon; Cenozoic; Clastic rocks; Climate change; Cooling; East Coast Basin; Foraminifera; Invertebrata; Isotope ratios; Isotopes; Leg 181; Leg 189; Lithofacies; Lithostratigraphy; Marine sedimentation; Marine sediments; Microfossils; Mudstone; New Zealand; ODP Site 1121; ODP Site 1172; Ocean Drilling Program; Organic compounds; Pacific Ocean; Paleocene; Paleoclimatology; Paleogene; Petroleum; Petroleum exploration; Protista; Radiolaria; Sea-level changes; Sedimentary rocks; Sedimentation; Sediments; Source rocks; South Pacific; Southwest Pacific; Stable isotopes; Tartan Formation; Tasman Sea; Tertiary; Total organic carbon; Upper Paleocene; Waipawa Formation; West Pacific
Coordinates: S435800 S435700 E1495600 E1495500
Record ID: 2015066723
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands