Mid-Pleistocene extinction of deep-sea foraminifera in the North Atlantic Gateway (ODP sites 980 and 982)

Citation for published item:w glymontD iFvF nd osdi nD FwF nd osellEwel¡ e D eF nd osenth lD F @PHIQA 9i rly leisto ene se Esurf e temper ture trends X e rly oolingD gl i l intensi( tionD nd impli tions for the midE leisto ene lim te tr nsitionF9D i rthEs ien e reviewsFD IPQ F ppF IUQEIWQF Further information on publisher's website:httpXGGdxFdoiForgGIHFIHITGjFe rs irevFPHIQFHRFHHT Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Earth-science reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Earth-science reviews. 123, 2013, 10.1016/j.earscirev.2013.04.006 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractThe mid-Pleistocene climate transition (MPT) is defined by the emergence of high amplitude, quasi-100 ka glacial-interglacial cycles from a prior regime of more subtle 41 ka cycles. This change in periodicity and amplitude cannot be explained by a change in 'external' astronomical forcing. Here, we review and integrate published records of sea-surface temperatures (SSTs) to assess whether a common global expression of the MPT in the surface ocean can be recognized, and examine our findings in light of mechanisms proposed to explain climate system reorganization across the MPT. Weshow that glacial-interglacial variability in SSTs is superimposed upon a longer-term cooling trend in oceanographic systems spanning the low-to high-latitudes. Regional Alongside the long-term SST cooling trends, quasi-100 ka cycles begin to emerge in both the SST and  18 O records at 1.2 Ma, and become dominant with the expansion of the ice-sheets at 0.9 Ma. We show that the intensified glacial-stage cooling is accompanied by...

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“…12 associated with circulation change across the MPT (Kawagata et al, 2005). The potential impacts of such events are considered below.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Pleistocene sea-surface temperature evolution: Early cooling, delayed glacial intensification, and implications for the mid-Pleistocene climate transition

McClymont

Sosdian

Rosell-Melé

et al. 2013

Earth-Science Reviews

177

172

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“…These single shells are considered allochthonous, as the corresponding planktonic foraminifers indicate reworking ( Table T8). After careful consideration and comparison with age estimates from the other microfossil groups, the Stilostomella extinction (0.58-0.7 Ma) (Hayward, 2002;Kawagata et al, 2005) is placed between Samples 339-U1390A-31X-CC and 32X-CC (284.61-293.68 mbsf).…”

Section: Benthic Foraminifersmentioning

confidence: 99%

Site U1390

2013

Proceedings of the IODP

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Integrated Ocean Drilling Program (IODP) Site U1390 (36°19.110′N, 7°43.078′W, 992 m water depth) is located southeast of the Guadalquivir Bank and the Guadalquivir contourite channel (Fig. F1, F2) over the large sheeted drifts from the northwest part of Sector 3 of the contourite depositional system (CDS) (channel and ridge sector defined by Hernández-Molina et al., 2003, andLlave et al., 2007a). This site represents an opportunity for identifying the recent tectonic influence on the architecture and evolution of the CDS and how it affected Mediterranean Ocean Water (MOW) distribution. It was selected to recover an early Pleistocene to present sedimentary record as well as date several prominent unconformities (Fig. F2) that can be traced regionally across the dense seismic grid.This area, located in the central middle slope of the Gulf of Cádiz, has been affected by recent tectonic activity, which controlled the major morphostructural features and its recent evolution (Maldonado et al

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“…Locations of North Atlantic cores discussed in this paper (see Table 1). Paths of major deep-water (Raymo et al 2004, Kawagata et al 2005) and surface-water flows (de Vernal and Hillaire-Marcel 2006) may be less important for metazoan taxa compared to protozoans such as benthic foraminifera (Shimanaga et al 2004). On the other hand, Hunt et al (2005) recently pointed out the importance of temperature in benthic foraminiferal diversity.…”

Section: Productivity and Temperature As Causal Factors Of Large-scalmentioning

confidence: 99%

Climatic Influences on Deep‐sea Ostracode (Crustacea) Diversity for the Last Three Million Years

Yasuhara¹,

Cronin²

2008

Ecology

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Abstract. Ostracodes are small, bivalved crustaceans with the finest-scale fossil resolution of any metazoan, rivaled only by the fossil record of the protistan Foraminifera. This article presents a synthesis of the patterns and possible causes of alpha species diversity variation in benthic deep-sea ostracodes at drilling sites in the North Atlantic and Arctic Oceans. Taken together, these sites represent a period of great climatic variability covering the past three million years. Sediment cores taken from the Mid-Atlantic Ridge show a positive correlation between warm temperatures and high species diversity. These Mid-Atlantic Ridge cores, at the same latitude as northern Spain, show the same positive correlation during the last two glacial-interglacial cycles (200-0 ka [thousands of years ago]) as they do during the pre-glacial Pliocene 2.85-2.4 Ma (millions of years ago). This positive correlation is also found in Pliocene cores from the Rockall Plateau, at the same latitude as Ireland. During the last 200 thousand years, however, this correlation is reversed in cores taken from both the Rockall and Iceland Plateaus. The discovery of high diversity during colder periods in recent high-latitude Rockall and Iceland cores seems to be explained by spikes in diversity caused by ice-rafting events, which would not affect the lower-latitude Mid-Atlantic Ridge. The Heinrich ice-rafting events reduce North Atlantic surface temperatures and salinity every ;6-12 ka, dramatically decreasing surface productivity. This increase in diversity during Heinrich events may be explained either by a negative correlation between surface productivity and benthic diversity or by increase in diversity caused by moderate disturbance when ice rafted debris fall to the bottom of the ocean.

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Mid-Pleistocene extinction of deep-sea foraminifera in the North Atlantic Gateway (ODP sites 980 and 982)

Cited by 58 publications

References 53 publications

Pleistocene sea-surface temperature evolution: Early cooling, delayed glacial intensification, and implications for the mid-Pleistocene climate transition

Pleistocene sea-surface temperature evolution: Early cooling, delayed glacial intensification, and implications for the mid-Pleistocene climate transition

Site U1390

Climatic Influences on Deep‐sea Ostracode (Crustacea) Diversity for the Last Three Million Years

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