A physical record of the Antarctic Circumpolar Current: Late Miocene to recent slowing of abyssal circulation

Hassold, Noralynn J C; Rea, David K.; Pluijm, Ben A. van der; Parés, Josep M.

doi:10.1016/j.palaeo.2009.01.011

Cited by 28 publications

(17 citation statements)

References 42 publications

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“…During this episode, orbitally forced glacial cycles switched in periodicity from 41 to 100 kyr cycles, resulting in colder, extended glacial conditions and northerly shifts in the ACC polar front in the South Atlantic far beyond the northerly extent of recent glacial front migrations [58]. Sediment analyses off the Antarctic Peninsula indicate that there has been a decline in ACC strength since approximately 2.5 Ma [59], which might have cut off the supply of Kiwa larvae across fracture zones such as the ABFZ at some point. Exploration of the American–Antarctic Ridge and lower reaches of the SWIR around the Bouvet Triple Junction may elucidate present-day barriers to gene flow between the ESR and SWIR kiwaids, and help in the inference of past changes responsible for their divergence.…”

Section: Discussionmentioning

confidence: 99%

The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura)

et al. 2013

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The phylogeny of the superfamily Chirostyloidea (Decapoda: Anomura) has been poorly understood owing to limited taxon sampling and discordance between different genes. We present a nine-gene dataset across 15 chirostyloids, including all known yeti crabs (Kiwaidae), to improve the resolution of phylogenetic affinities within and between the different families, and to date key divergences using fossil calibrations. This study supports the monophyly of Chirostyloidea and, within this, a basal split between Eumunididae and a Kiwaidae–Chirostylidae clade. All three families originated in the Mid-Cretaceous, but extant kiwaids and most chirostylids radiated from the Eocene onwards. Within Kiwaidae, the basal split between the seep-endemic Kiwa puravida and a vent clade comprising Kiwa hirsuta and Kiwa spp. found on the East Scotia and Southwest Indian ridges is compatible with a hypothesized seep-to-vent evolutionary trajectory. A divergence date estimate of 13.4–25.9 Ma between the Pacific and non-Pacific lineages is consistent with Kiwaidae spreading into the Atlantic sector of the Southern Ocean via the newly opened Drake Passage. The recent radiation of Kiwaidae adds to the list of chemosynthetic fauna that appear to have diversified after the Palaeocene/Eocene Thermal Maximum, a period of possibly widespread anoxia/dysoxia in deep-sea basins.

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Section: Discussionmentioning

confidence: 99%

The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura)

et al. 2013

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“…Sedimentary magnetic fabrics, which can be detected using the anisotropy of magnetic susceptibility (AMS) or other types of magnetic anisotropy (Jackson, 1991;Rochette et al, 1992), have been widely analysed in tectonic studies (e.g., Borradaile and Tarling, 1981;Kissel et al, 1986;Tarling and Hrouda, 1993;Aubourg et al, 1995;Sagnotti et al, 1998;Kanamatsu et al, 2001;Weaver et al, 2004), in analysis of paleocurrent directions (e.g., Rees, 1961Rees, , 1965Hamilton and Rees, 1970;Ellwood and Ledbetter, 1977;Kissel et al, 1997Kissel et al, , 1998Hassold et al, 2006Hassold et al, , 2009Parés et al, 2007), and to detect sedimentary disturbances (e.g., Marino and Ellwood, 1978;Rosenbuam et al, 2000;Schwehr and Tauxe, 2003). If elongated magnetic particles are aligned by paleocurrents, the magnetic fabric of the sediment will have been preserved from the time of deposition.…”

Section: Locking Of Sedimentary Magnetic Fabricsmentioning

confidence: 99%

Magnetic mineral diagenesis

Roberts

2015

Earth-Science Reviews

343

347

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“…Bottom currents affect not only the sorting of particles in drift sediments, but also their spatial arrangement. This typically results in enhancement of the initial sedimentary fabric; important insights on bottom current dynamics have also therefore been inferred from both the directional properties of the magnetic fabric (anisotropy of magnetic susceptibility, AMS) [ Parés et al , 2007] as well as its shape and degree of anisotropy [ Kissel et al , 1997, 1998; Hassold et al , 2006, 2009a, 2009b]. Most if not all rock magnetic and AMS studies of drift sediments have focused on bottom current dynamics in high‐latitude settings such as the North Atlantic and peri‐Antarctic basins.…”

Section: Recent Developments In Environmental Magnetismmentioning

confidence: 99%

Environmental magnetism: Principles and applications

Liu

Roberts

Larrasoaña

et al. 2012

Reviews of Geophysics

576

405

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In environmental magnetism, rock and mineral magnetic techniques are used to investigate the formation, transportation, deposition, and postdepositional alterations of magnetic minerals under the influences of a wide range of environmental processes. All materials respond in some way to an applied magnetic field, and iron‐bearing minerals are sensitive to a range of environmental processes, which makes magnetic measurements extremely useful for detecting signals associated with environmental processes. Environmental magnetism has grown considerably since the mid 1970s and now contributes to research in the geosciences and in branches of physics, chemistry, and biology and environmental science, including research on climate change, pollution, iron biomineralization, and depositional and diagenetic processes in sediments to name a few applications. Magnetic parameters are used to routinely scan sediments, but interpretation is often difficult and requires understanding of the underlying physics and chemistry. Thorough examination of magnetic properties and of the environmental processes that give rise to the measured magnetic signal is needed to avoid ambiguities, complexities, and limitations to interpretations. In this review, we evaluate environmental magnetic parameters based on theory and empirical results. We describe how ambiguities can be resolved by use of combined techniques and demonstrate the power of environmental magnetism in enabling quantitative environmental interpretations. We also review recent developments that demonstrate the mutual benefit of environmental magnetism from close collaborations with biology, chemistry, and physics. Finally, we discuss directions in which environmental magnetism is likely to develop in the future.

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A physical record of the Antarctic Circumpolar Current: Late Miocene to recent slowing of abyssal circulation

Cited by 28 publications

References 42 publications

The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura)

The biogeography of the yeti crabs (Kiwaidae) with notes on the phylogeny of the Chirostyloidea (Decapoda: Anomura)

Magnetic mineral diagenesis

Environmental magnetism: Principles and applications

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