Tectonic Synthesis and Implications of Japan Sea ODP Drilling

Tamaki, Kensaku

doi:10.2973/odp.proc.sr.127128.240.1992

Cited by 227 publications

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“…Otofuji and Matsuda (1984) Otofuji et al (1985) 25 46 (Otofuji and Matsuda, 1984) (1985) 15 Ma 100 47 15 Ma ( 60 cm/yr) Miyashiro (1986) ( ) Tatsumi et al (1989) (300 C ) (McKenzie and Bickle, 1988) Tamaki et al (1992) ODP ( = BABB) 17 24 Ma (Kaneoka et al, 1992;795;17 24 Ma 797;18 19 Ma 794; 20 21 Ma) BABB (= MORB) (= island arc tholeiite; IAT) (= ocean island tholeiite; OIT) 2 (Allan and Gorton, 1992) BABB MORB MORB (Cousens and Allan, 1992;Cousens et al, 1994) 794 BABB 2 (Allan and Gorton, 1992) ( Cousens and Allan, 1992;Cousens et al, 1994) ( LREE) BABB ( ) (Chen and Lee, 1996) III. Tamaki et al (1992).…”

Section: IImentioning

confidence: 99%

Peridotite xenoliths from the Takeshima seamount, Japan: an insight into the upper mantle beneath the Sea of Japan

小満¹,

章司²,

輝秋³

2007

Japanese Magazine of Mineralogical and Petrological Sciences

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The Sea of Japan is one of the back arc basins distributed around the western rim of the Pacific. Nature of the plume for back arc basin (= BAB) opening is unknown partly because petrological characteristics of the BAB mantle are not well known compared with mid ocean ridge (= MOR) mantle.Peridotite xenoliths in an alkali basalt dredged from the Takeshima seamount (tentative name), ca. 230 km to the north of Oki islands, are examined to clarify the petrological feature of the Japan Sea mantle. They are spinel bearing lherzolite to harzburgite with equigranular to porphyroclastic textures. They can be classified into two types (Type 1 and Type 2 peridotites) in terms of REE (= rare earth elements) patterns of clinopyroxene (= cpx). Type 1 peridotites (Cr# of spinels, 0.4 0.5) are similar to abyssal peridotites in terms of major element chemistry and middle to heavy REE concentrations of cpx. The cpx in the former shows slight enrichment of LREE (= light REE), which is apparently due to metasomatism by slab derived fluids/melts. Type 2 peridotites have high REE cpx with flat to slightly LREE enriched patterns, and are quite similar to subcontinental peridotites obtained as xenoliths from China. The southern part of the Sea of Japan was formed by mainly thinning and rifting of the continental lithosphere. Type 2 peridotites are a remnant of the continental lithospheric mantle.Chemical characteristics of BAB basalts and Type 1 peridotites indicate that open system melting of peridotite affected by a flux from the downgoing slab was involved in the Japan Sea opening.

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Section: IImentioning

confidence: 99%

Peridotite xenoliths from the Takeshima seamount, Japan: an insight into the upper mantle beneath the Sea of Japan

小満¹,

章司²,

輝秋³

2007

Japanese Magazine of Mineralogical and Petrological Sciences

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“…For all sites, the scatter in values suggests that the method has a maximum uncertainty of about 25° C. The ramification of this simple interpretation is that the silica transitions represent approximate isotherms. When tied to seismic reflection data, they provide a regional look at present gradient and heat flow variation in the eastern Japan Sea (e.g., Tamaki, Pisciotto, Allan, et al, 1990;Kuramoto et al, this volume).…”

Section: Isotopic Temperatures and Thermal Gradientsmentioning

confidence: 99%

“…Interstitial water samples were obtained at each hole drilled during Leg 127 by squeezing 10-cm-long, whole-round sediment samples immediately upon retrieval using a conventional stainless steel device and a newly developed plastic-lined squeezer (Manheim and Sayles, 1974;Tamaki, Pisciotto, Allan, et al, 1990;Brumsack et al, this volume). Sampling frequency averaged one sample per 10 m of section in the soft sediments and one sample every 10-40 m in the underlying indurated sediments at each site.…”

Section: Pore Watersmentioning

confidence: 99%

“…One of the principal findings of the recent ODP drilling in the eastern Japan Sea was that diagenetic processes significantly affect the Neogene sediments at all sites (Tamaki, Pisciotto, Allan, et al, 1990;Ingle, Suyehiro, von Breymann, et al, 1990). The most pronounced and widespread of these processes is the thorough alteration of opaline diatomaceous sediments to hard porcellanites and cherts.…”

Section: Introductionmentioning

confidence: 99%

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Thermal History of Japan Sea Sediments from Isotopic Studies of Diagenetic Silica and Associated Pore Waters

Pisciotto¹,

Murray²,

Brumsack³

1992

Proceedings of the Ocean Drilling Program

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Over a broad region of the eastern Japan Sea, Neogene opaline diatomaceous sediments alter with depth to hard porcellanites and cherts composed of opal-CT and quartz. We examined the oxygen isotopic compositions of these diagenetic silica minerals at four widely spaced sites occupied during ODP Leg 127 in order to investigate the thermal history of the region. Formation temperatures computed from these isotopic data range from 22° to 68° C for opal-CT and from 44° to 92° C for diagenetic quartz, quite similar to temperature ranges estimated from the extrapolated modern gradients, 36°-43°C and 49°-64°C, respectively. At each site the isotopic temperature values cluster near the extrapolated ambient sediment temperatures. As a first approximation, the similarities suggest that the positions of the silica transformations in the basin are controlled by the present thermal regime.In detail, isotopic and ambient temperatures differ. If these differences are real, then they reflect variations in the thermal histories at these sites. At Sites 794 and 797 in the Yamato Basin, isotopic temperatures and gradients computed from these data are lower than or comparable to ambient temperatures and gradients. We suggest that the silica zones have roughly equilibrated with the modern gradients at these localities. At Site 795 in the Japan Basin, isotopic temperatures are also lower than ambient sediment temperatures at comparable depths, but the gradient computed from the isotopic temperatures is higher than the present measured gradient. For both scenarios to hold, the silica zones must have formed under initially high gradients during the early post-rift period at this locality. These zones were then rapidly buried and have yet to equilibrate with the modern lower gradient. At Site 796 on Okushiri Ridge, isotopic temperatures exceed present temperatures as expected for an area of recent uplift. The gradient computed from our isotopic data and the thickness of the opal-CT zone indicate a higher gradient than at present at this site, apparently reflecting higher heat fluxes during the early post-rift period or recent frictional heating from nearby reverse fault activity.

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“…1 (Tamaki et al, 1992) ( ) ( 1973;1983;Iwamori, 1991) 9 6 3. Mercier and Nicolas (1975) Mercier and Nicolas (1975) (Fig.…”

mentioning

confidence: 99%

Petrography and Geochemistry of the mantle xenoliths: Implications for lithospheric mantle beneath the Japan arcs

なつ江

章司²

2005

Japanese Magazine of Mineralogical and Petrological Sciences

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Recent developments in instrumentation for in situ trace element analysis of peridotite minerals give us valuable data set of petrological and geochemical insights of the upper mantle. Here, we summarize petrographical, petrological and geochemical characteristics of mantle xenoliths from the Northeastern and Southwestern Japan arcs. They have clear correlations between microtexture and mineral compositions in terms of both major and trace elements. That suggests that influx assisted melt extraction occurs simultaneously with deformation/recrystalization in the upper mantle. Their characteristics of trace elements in clinopyroxene are distinguished from those of abyssal peridotite and peridotite xenoliths from continental regions. The geochemistry of Japan arcs clinopyroxenes have characteristics of arc type mantle source; i.e., low light rare earth element (LREE) and high field strength element (HFSE; Ti, Zr and so on), rather high heavy rare earth (HREE) relative to LREE elements and Sr concentrations. They also have a rather constant Ti/Zr ratio, variable REE patterns, and relatively low LREE/HREE ratios. The simple melt extraction model can not explain these characteristics. These features are due to metasomatism, which is different from carbonatite metasomatism.

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Tectonic Synthesis and Implications of Japan Sea ODP Drilling

Cited by 227 publications

References 0 publications

Peridotite xenoliths from the Takeshima seamount, Japan: an insight into the upper mantle beneath the Sea of Japan

Peridotite xenoliths from the Takeshima seamount, Japan: an insight into the upper mantle beneath the Sea of Japan

Thermal History of Japan Sea Sediments from Isotopic Studies of Diagenetic Silica and Associated Pore Waters

Petrography and Geochemistry of the mantle xenoliths: Implications for lithospheric mantle beneath the Japan arcs

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