Late Mesozoic phytogeography in eastern Eurasia with special reference to the origin of angiosperms in time and site.

Ohana, Tamiko; Kimura, Takeshi

doi:10.5575/geosoc.101.54

Cited by 27 publications

(15 citation statements)

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“…However, we conclude that the low generic diversity of fossil wood in the Japanese Outer Zone, especially during the Late Jurassic to Early Cretaceous, can be explained by the existence of a marked dry season in the JOZ. This is consistent with previous inferences from fossil leaves and cuticles (Ohana and Kimura, 1995;Yamada and Uemura, 2008). A temporary cold oceanic current, much like the ''Oya Shio'' today, could determine such a dry season.…”

Section: Discussionsupporting

confidence: 86%

“…Palynological researches have evidenced that the palaeophytogeographic provincialism might have weakened after the Albian (late Early Cretaceous; Umetsu and Sato, 2007). This latitudinal distribution pattern is interpreted as a consequence of climate, with Ryoseki-type floras having features of hot and arid to semi-arid floras and Tetori-type plants being ''typical of warm-temperate and moderately humid climatic conditions'' (Ohana and Kimura, 1995).…”

Section: Introductionmentioning

confidence: 99%

“…Seminal studies by Kimura and others (Kimura, Ta., 1980, 1987aOhana and Kimura, 1995) of the Late Mesozoic (Late Jurassic -Early Cretaceous) leaf assemblages distinguished two types of Mesozoic floras ( Fig. 1): the so-called Ryoseki-type in the south, with Euro-Sinian affinities, and the Tetori-type in the north, with Siberian affinities.…”

Section: Introductionmentioning

confidence: 99%

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Fossil wood diversity gradient and Far-East Asia palaeoclimatology during the Late Triassic – Cretaceous interval

Legrand

Kim

et al. 2011

Journal of Asian Earth Sciences

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Section: Discussionsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Fossil wood diversity gradient and Far-East Asia palaeoclimatology during the Late Triassic – Cretaceous interval

Legrand

Kim

et al. 2011

Journal of Asian Earth Sciences

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“…The inferred low latitude position for the South Kitakami massif during Cretaceous is consistent with plant assemblages (Ohana and Kimura, 1995), even though the original proposal of the northward translation mechanism with Pacific plate motion (Otofuji et al, 1997) is incompatible with the presence of voluminous acidic rocks and with the correlation of timing of magmatic events in the massif with that in some continental terranes in SW Japan (Sakashima et al, 2003).…”

Section: Sample Descriptionmentioning

confidence: 50%

Nonlinear thermoremanence corrections for Thellier paleointensity experiments on single plagioclase crystals with exsolved magnetites: a case study for the Cretaceous Normal Superchron

Usui

Nakamura

2009

Earth Planet Sp

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Single plagioclase paleointensity experiment has been an excellent tool to reliably estimate ancient geomagnetic field intensity. Although transparent plagioclases with magmatic nanophase magnetites have shown their potential for paleointensity estimation, in most cloudy plagioclases with exsolved magnetites, the problems of strong anisotropy as rod-shape magnetites, the hyperbolic tangential saturation of thermoremanence (TRM), and slow cooling of host plutons need to be addressed. In this paper, we propose experimental schemes to address these problems with considerations of error estimation and uncertainty for paleointensity experiments on exsolved magnetite. First, in order to experimentally check the effect of the hyperbolic tangential saturation of TRM, we performed Thellier simulation experiments using laboratory total TRM as simulated natural remanence (NRM). Single cloudy plagioclases were sampled from early Cretaceous granite in the Kitakami massif, Northeast Japan. We designed the experiment where the total TRM and the partial TRMs in the Thellier experiments were acquired under different field intensities. For these experiments, correction for hyperbolic tangential TRM acquisition yielded precise field intensity estimations. Next, Thellier experiments on NRM of the crystals from the same granite were performed as a demonstration of correction schemes for both magnetic anisotropy and hyperbolic tangential TRM acquisition. Precise determination of anisotropy tensor seems to be the major challenge for single plagioclase paleointensity estimation with exsolved magnetite.

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“…-173 SBEI FPDM Kimura, 1987, 1995Kimura, 1987Kimura, 1987 , Geyler 1877 Yokoyama, 1889;, 1933;Ogura et al, 1951;Kimura and Sekido, 1972, 1976a, b, 1978, 1978;, 1979;, 20003 Kimura, 1975, 1987Yabe et al, 2003Yabe and Kubota, 2004;Yabe et al, 2003Matsukawa et al, 2006Sano et al, 20082003bMatsukawa et al 20062003a/ / 2003c2003a/ Kimura 1975Kimura and Sekido 1976b, 19781978/ Matsukawa et al 2006 2003a …”

mentioning

confidence: 99%

Stratigraphy of the Lower Cretaceous Tetori Group and stratigraphic implication of plant assemblages in the border area between Ishikawa and Fukui Prefectures, central Japan

Sakai

Sekido

Matsuoka

2018

Jour. Geol. Soc. Japan

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The stratigraphy of the Tetori Group in the Shiramine area of Ishikawa Prefecture and the Takinamigawa area of Fukui Prefecture has been reexamined, and the plant-bearing horizons stratigraphically compared. The Tetori Group in the study areas is divided into the Gomijima, Kuwajima, Akaiwa, and Kitadani Formations, in ascending stratigraphic order. Plant assemblages from the Akaiwa Formation around Mt. Oarashiyama in the Shiramine area comrise species of genera typified by the abundant occurrence of Tetoritype floral elements including ferns, ginkgoaleans, and conifers. The floral elements are associated with minor Zamites-like macrophyllous bennettitalean (or cycadalean) and microphyllous coniferous foliage represented by Brachyphyllum, indicating a climate with a dry season(s). Previously the occurrence of the Ryoseki-type floral elements was presumed to be consistent with floral change and a warming and drying climate during the deposition of the Kitadani Formation. However, this study suggests that such a trend started from the deposition of the Akaiwa Formation, earlier than previously thought.

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Late Mesozoic phytogeography in eastern Eurasia with special reference to the origin of angiosperms in time and site.

Cited by 27 publications

References 0 publications

Fossil wood diversity gradient and Far-East Asia palaeoclimatology during the Late Triassic – Cretaceous interval

Fossil wood diversity gradient and Far-East Asia palaeoclimatology during the Late Triassic – Cretaceous interval

Nonlinear thermoremanence corrections for Thellier paleointensity experiments on single plagioclase crystals with exsolved magnetites: a case study for the Cretaceous Normal Superchron

Stratigraphy of the Lower Cretaceous Tetori Group and stratigraphic implication of plant assemblages in the border area between Ishikawa and Fukui Prefectures, central Japan

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