Tasman Frontier Subduction Initiation and Paleogene Climate

Sutherland, Rupert; Dickens, Gerald R.; Blum, Peter

doi:10.14379/iodp.proc.371.2019

Cited by 18 publications

(61 citation statements)

References 150 publications

(274 reference statements)

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“…Redeposition of Paleocene or older sediments is suggested by the frequent presence of large, broken specimens of the genus Lenticulina, which is inferred to have been derived from shelf environments (e.g., in Samples 378-U1553C-35R-CC and 378-U1553D-9R-CC to 12R-CC). A similar occurrence of this genus in deepwater settings was reported by Sutherland et al (2019) for IODP Expedition 371 sediments. The presence of bryozoan fragments in Samples 378-U1553C-35R-CC and 378-U1553D-11R-CC also suggests downslope redeposition of shelf sediments.…”

Section: Benthic Foraminiferssupporting

confidence: 86%

See 1 more Smart Citation

Site U1553

Röhl¹,

Thomas²,

Childress³

et al. 2022

Proceedings of the International Ocean Discovery Program

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Section: Benthic Foraminiferssupporting

confidence: 86%

“…Hollis, unpubl. data;Sutherland et al, 2019). This zonation incorporates the Oligocene-late Eocene Southern Ocean zonation of Funakawa and Nishi (2005).…”

Section: Radiolariansunclassified

Site U1553

Röhl¹,

Thomas²,

Childress³

et al. 2022

Proceedings of the International Ocean Discovery Program

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“…In 2017, IODP Expedition 371 recovered Paleocene and Upper Cretaceous sediments at Site U1509 on the southeastern Lord Howe Rise (Fig. 1) (Sutherland et al, 2019). The stratigraphy of the K-Pg boundary at Site Martini (1971) and Agnini et al (2014), and those of the Upper Cretaceous are after Burnett (1998).…”

Section: Discussionmentioning

confidence: 99%

Stratigraphy around the Cretaceous-Paleogene boundary in sediment cores from the Lord Howe Rise, Southwest Pacific

et al. 2021

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During Deep Sea Drilling Project (DSDP) Leg 21, Cenozoic and latest Cretaceous sediments were recovered at Site 208 on the Lord Howe Rise, Southwest Pacific. We provide new biostratigraphic, magnetostratigraphic and chemostratigraphic data from Site 208 to constrain the stratigraphy around the Cretaceous-Paleogene (K-Pg) boundary and to determine the depth of the K-Pg boundary more precisely. Biostratigraphic data from calcareous nannofossils indicate a near-continuous succession of sediments from the mid-Maastrichtian (Late Cretaceous) to lowermost Thanetian (Paleocene) at depths of 540−590 m below seafloor (mbsf). The biostratigraphic data suggest that the K-Pg boundary corresponds to a siliceous claystone at the base of an interval of silicified sediments (576.0−576.8 mbsf). Carbonate carbon isotopic composition (δ13Ccarb) reveals a negative shift across this interval, which is consistent with global patterns of δ13C across the K-Pg boundary. Osmium concentration and Os isotopic composition (187Os/188Os) can also be used to identify the K-Pg boundary interval, as it is marked by a peak in Os concentration and a drop in 187Os/188Os values to 0.12−0.15, both of which are the result of the Chicxulub impact event. Our 187Os/188Os data show trends similar to those of coeval global seawater with the lowest value of 0.12−0.16 in the siliceous claystone (576.8 mbsf). However, the concentration of Os is low (<80 pg g−1) in this sample, which suggests that this siliceous claystone was deposited around the K-Pg boundary but may not include the boundary itself. Although the sedimentary record across the K-Pg interval at Site 208 may not be completely continuous, it nevertheless captures a time interval that is close to the Chicxulub impact event.

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“…The age model for this study was created using a combination of magnetostratigraphy (Lam & Leckie, 2020b) and calcareous nannofossil biostratigraphy from ODP Leg 198 (Bralower et al, 2002), with ages of calcareous nannofossil datums updated to those of Sutherland et al (2019). In total, nine chrons and microfossil datums were used to constrain age to a depth of 30.00 mbsf (Table 2).…”

Section: Time Series Analysismentioning

confidence: 99%

“…An untuned age model (Lam & Leckie, 2020a) was used to explore external forcing factors that may influence the expansion and contraction of the subtropical gyre system independent of ice volume changes as recorded in the global benthic foraminiferal oxygen isotope stack (e.g., Ahn et al, 2017;Lisiecki & Raymo, 2005;Reilly et al, 2021). Power spectral estimates were made using the robust locally weighted regression spectral background estimation (LOWSPEC), as this technique has been proven to produce substantially lower rates of (Lam & Leckie, 2020b) and Calcareous Nannofossil Biostratigraphy (Bralower et al, 2002) With Ages of Datums Updated to Those in Sutherland et al (2019) false positive estimates compared to other methods (e.g., Mann & Lees, 1996). Furthermore, this technique also provides a better estimation of the overall detection of the combination of low and high frequencies associated with Milankovitch cycles (i.e., Mann & Lees, 1996;Meyers, 2012).…”

Section: Time Series Analysismentioning

confidence: 99%

Expanded North Pacific Subtropical Gyre and Heterodyne Expression During the Mid‐Pleistocene

Taylor

Patterson

Lam

et al. 2022

Paleoceanog and Paleoclimatol

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The Kuroshio Current (KC) and Kuroshio Current Extension (KCE) form a western boundary current as part of the North Pacific Subtropical Gyre. This current plays an important role in regulating weather and climate dynamics in the Northern Hemisphere in part by controlling the delivery of moisture to the lower atmosphere. Previous studies indicate the KCE responded dynamically across glacial and interglacial periods throughout the Pliocene‐Pleistocene. However, the response of the KCE during Pleistocene super‐interglacials has not been examined in detail. We present a ∼2.2 Ma record of X‐ray fluorescence elemental data from Ocean Drilling Program Hole 1207A and employ hierarchical clustering techniques to demonstrate paleoenvironmental changes around the KCE. Time‐frequency analysis identifies significant heterodyne frequencies, which suggests there were nonlinear interactions between high‐latitude and low‐latitude climate regulating expansion and contraction of the North Pacific Subtropical Gyre prior to the onset of the Mid‐Pleistocene Climate Transition (MPT). We observe two periods of elevated ln Ca/Ti, which may represent sustained warmth with northward migrations of the KCE in the northwestern Pacific. These intervals correspond to Marine Isotope Stages 29‐25, 15, and 11‐9 and occur around recent climatic transitions, the MPT and Mid‐Brunhes Event. Northward expansion of the subtropical gyre during these exceptionally warm interglacials would have delivered more heat and moisture to the high latitudes of the northwest Pacific. Furthermore, enhanced evaporation from the warm KCE vented to the lower atmosphere may have preconditioned the Northern Hemisphere for ice volume growth during two of the most recent periods of climate transition.

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Tasman Frontier Subduction Initiation and Paleogene Climate

Abstract: Introduction 4 Scientific background 7 Scientific objectives 7 Drilling strategy 8 Site summaries 19 Summary of scientific results 27 References

Cited by 18 publications

References 150 publications

Site U1553

Site U1553

Stratigraphy around the Cretaceous-Paleogene boundary in sediment cores from the Lord Howe Rise, Southwest Pacific

Expanded North Pacific Subtropical Gyre and Heterodyne Expression During the Mid‐Pleistocene

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