Global cooling in marine climates and local tectonic events in Southwest Japan at the Plio–Pleistocene boundary

Iwatani, Hokuto; Irizuki, Toshiaki; Hayashi, Hiroki

doi:10.1016/j.palaeo.2012.05.025

Cited by 18 publications

(12 citation statements)

References 48 publications

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“…Our model simulations do show a reduction of the temperature difference between the North Atlantic and North Pacific from the Pliocene to the pre-industrial (Table 2). However, the simulated difference in the Pliocene is not as enhanced as seen in the records2, perhaps suggesting that there could be local palaeogeographic changes not incorporated into the PlioMIP experimental design that affect the temperatures on Shatsky Rise20212223. As North Pacific circulation similar to modern is produced in the Pliocene simulations with more ice, this causes a warming of North Pacific waters, explaining the long-term increases in North Pacific temperatures during the initiation of Northern Hemisphere Glaciation2.…”

Section: Resultsmentioning

confidence: 95%

Modelled ocean changes at the Plio-Pleistocene transition driven by Antarctic ice advance

2017

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The Earth underwent a major transition from the warm climates of the Pliocene to the Pleistocene ice ages between 3.2 and 2.6 million years ago. The intensification of Northern Hemisphere Glaciation is the most obvious result of the Plio-Pleistocene transition. However, recent data show that the ocean also underwent a significant change, with the convergence of deep water mass properties in the North Pacific and North Atlantic Ocean. Here we show that the lack of coastal ice in the Pacific sector of Antarctica leads to major reductions in Pacific Ocean overturning and the loss of the modern North Pacific Deep Water (NPDW) mass in climate models of the warmest periods of the Pliocene. These results potentially explain the convergence of global deep water mass properties at the Plio-Pleistocene transition, as Circumpolar Deep Water (CDW) became the common source.

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Section: Resultsmentioning

confidence: 95%

Modelled ocean changes at the Plio-Pleistocene transition driven by Antarctic ice advance

2017

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“…Ostracod and planktic foraminiferal analyses reveal cooling in a 2.8 to 2.5 Ma section on the west coast of Kyushu (Iwatani et al 2012). Modern analog technique (MAT) reveals that Kuroshio influence decreased significantly across the Pliocene-Pleistocene boundary (~2.6 Ma) associated with global glacio-eustatic intensification (Iwatani et al 2012).…”

Section: Pliocene To Middle Pleistocene History Of the Kuroshio Currentmentioning

confidence: 99%

“…Modern analog technique (MAT) reveals that Kuroshio influence decreased significantly across the Pliocene-Pleistocene boundary (~2.6 Ma) associated with global glacio-eustatic intensification (Iwatani et al 2012).…”

Section: Pliocene To Middle Pleistocene History Of the Kuroshio Currentmentioning

confidence: 99%

The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach

Gallagher

Kitamura

Iryu

et al. 2015

Prog. in Earth and Planet. Sci.

160

121

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The Kuroshio Current is a major western boundary current controlled by the North Pacific Gyre. It brings warm subtropical waters from the Indo-Pacific Warm Pool to Japan exerting a major control on Asian climate. The Tsushima Current is a Kuroshio offshoot transporting warm water into the Japan Sea. Various proxies are used to determine the paleohistory of these currents. Sedimentological proxies such as reefs, bedforms, sediment source and sorting reveal paleocurrent strength and latitude. Proxies such as coral and mollusc assemblages reveal past shelfal current activity. Microfossil assemblages and organic/inorganic geochemical analyses determine paleo-sea surface temperature and salinity histories. Transportation of tropical palynomorphs and migrations of Indo-Pacific species to Japanese waters also reveal paleocurrent activity. The stratigraphic distribution of these proxies suggests the Kuroshio Current reached its present latitude (35°N) by~3 Ma when temperatures were 1 to 2°C lower than present. At this time a weak Tsushima Current broke through Tsushima Strait entering the Japan Sea. Similar oceanic conditions persisted until~2 Ma when crustal stretching deepened the Tsushima Strait allowing inflow during every interglacial. The onset of stronger interglacial/glacial cycles~1 Ma was associated with increased North Pacific Gyre and Kuroshio Current intensity. This triggered Ryukyu Reef expansion when reefs reached their present latitude (~31°N), thereafter the reef front advanced (~31°N) and retreated (~25°N) with each cycle. Foraminiferal proxy data suggests eastward deflection of the Kuroshio Current from its present path at 24°N into the Pacific Ocean due to East Taiwan Channel restriction during the Last Glacial Maximum. Subsequently Kuroshio flow resumed its present trajectory during the Holocene. Ocean modeling and geochemical proxies show that the Kuroshio Current path may have been similar during glacials and interglacials, however the glacial mode of this current remains controversial. Paleohistorical studies form important analogues for current behavior with future climate change, however, there are insufficient studies at present in the region that may be used for this purpose. Modeling of the response of the Kuroshio Current to future global warming reveals that current velocity may increase by up to 0.3 m/sec associated with a northward migration of the Kuroshio Extension.

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“…The age control from C0002 cores is not precise enough to resolve eustatic cycles ( Figure S1), but it stands to reason that sediment influx to the Kumano Basin accelerated during each of the Pleistocene glacial lowstands, particularly after the onset of major Northern Hemisphere glaciation at 1.4 Ma [e.g., Miller et al, 2005;Lisiecki and Raymo, 2007]. Those eustatic cycles affected oceanographic circulation (i.e., Kuroshio and Tsushima Currents) [Iwatani et al, 2012] and forearc stratigraphy [e.g., Pickering et al, 1999].…”

Section: Geologic Background and Geographic Settingmentioning

confidence: 99%

Apparent overconsolidation of mudstones in the Kumano Basin of southwest Japan: Implications for fluid pressure and fluid flow within a forearc setting

Guo

Underwood

Likos

et al. 2013

Geochem Geophys Geosyst

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[1] The Kumano Basin is located in the Nankai Trough subduction zone of southwest Japan. During the past 1.6 million years, approximately 800 meters of sandy turbidites and hemipelagic mud were deposited near the distal edge of the forearc basin, at Site C0002 of the Integrated Ocean Drilling Program. Constant-rate-of-strain consolidation tests yield estimates of in situ permeability that range from 2.6 Â 10 À17 m 2 to 2.5 Â 10 À18 m 2 ; overconsolidation ratios range from 1.7 to 2.6, and values of the compression index range from 0.39 to 0.78. Several processes contributed to the apparent overconsolidation. Strata dip toward land, and pore fluids probably migrate up-dip and vent along a bathymetric notch near the seaward edge of the basin. Efficient lateral drainage through sandy turbidites has kept pore pressures within interbeds of mudstone at (or close to) hydrostatic. In addition, alteration of dispersed volcanic glass, precipitation of authigenic clay minerals, and collapse of random grain fabric has probably strengthened the bonding among grains. Cementation is particularly likely within the lower basin (unit III), where values of porosity remain anomalously high. If fluid overpressures (and underconsolidation) exist anywhere within the basin, the most likely loci are where sandy turbidites terminate against impermeable mudstones along landward-dipping on-lap surfaces. Those types of on-lap geometries, in addition to structural closures, might provide promising targets for oil/gas accumulation in other forearc basins, particularly where petroleum source rocks have been buried to the optimal depths of catagenesis.

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Global cooling in marine climates and local tectonic events in Southwest Japan at the Plio–Pleistocene boundary

Cited by 18 publications

References 48 publications

Modelled ocean changes at the Plio-Pleistocene transition driven by Antarctic ice advance

Modelled ocean changes at the Plio-Pleistocene transition driven by Antarctic ice advance

The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach

Apparent overconsolidation of mudstones in the Kumano Basin of southwest Japan: Implications for fluid pressure and fluid flow within a forearc setting

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