Initial Reports of the Deep Sea Drilling Project, 31

Karig, Daniel E.; Ingle, J.C. Jr.

doi:10.2973/dsdp.proc.31.1975

Cited by 283 publications

(56 citation statements)

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“…The lower stratified layer and the lower transparent layer are only observed in the marginal part of the basin and on the flank of the rise. There are two deep sea drilling sites in the Yamato Basin and its vicinity; Site 299 in the central part of the basin and Site 302 on the northeastern flank of the Yamato Rise (KARIG and INGLE, Jr., 1975). Outcrops of the lower sedimentary units of the Yamato Basin are commonly observed along the surrounding rises and ridges such as the Yamato Rise and the Sado Ridge (TAMAKI et al,1981).…”

Section: Age Estimation Based On Sediment Stratigraphymentioning

confidence: 99%

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Age Estimation of the Japan Sea on the Basis of Stratigraphy, Basement Depth, and Heat Flow Data

Tamaki

1986

J. geomagn. geoelec

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Ages of the Japan and the Yamato Basins in the Japan Sea were examined on the basis of three independent methods; stratigraphic consideration of the basin sediments, age-depth correlation, and age-heat flow correlation. Basement depths of the Japan and the Yamato Basins after sediment loading correction were compared with those of other marginal seas in the Western Pacific whose ages are well constrained. The age estimations by age-depth correlation and age-heat flow correlation show good coincidence in the Japan Basin. The age estimation of the Yamato Basin, however, shows a discrepancy among the three methods; the basement depth shows an age range from 6Ma to 0Ma, sediment stratigraphy shows that of about 10Ma, and heat flow data show the age from 30Ma to just over 10Ma. This discrepancy can be explained by the thick accumulation of Neogene volcaniclastics which are represented as acoustic basements on seismic reflection records with a refraction velocity of 3.5km/sec. The final estimated age of the Japan and the Yamato Basins is identical with a range of 30Ma or older to 15Ma or slightly younger.

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Section: Age Estimation Based On Sediment Stratigraphymentioning

confidence: 99%

“…Four DSDP holes of the Japan Sea did not reach the basement in the basin area ( Fig. 1) (KARIG and INGLE, Jr., 1975).…”

Section: Introductionmentioning

confidence: 99%

Age Estimation of the Japan Sea on the Basis of Stratigraphy, Basement Depth, and Heat Flow Data

Tamaki

1986

J. geomagn. geoelec

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“…Major research initiatives to study the Nankai Trough include active and passive source seismic surveys (e.g., Moore et al 1990Moore et al , 2009, drilling, and analysis of associated core, cuttings, and geophysical data (e.g., Karig et al 1975;Moore et al 2001;Tobin et al 2009). Scientific drilling in the Nankai Trough has included Ocean Drilling Program (ODP) Legs 131, 190, and 196 (Hill et al 1993;Moore et al 2001;Mikada et al 2002) offshore of Shikoku Island, and several IODP Expeditions offshore the Kii Peninsula as part of the NanTroSEIZE experiment 319,322,326,(332)(333)338, and 348) Tobin et al 2009Tobin et al , 2015Saffer et al 2010;Saito et al 2010;Kopf et al 2011;Henry et al 2012;Moore et al 2013).…”

Section: Geologic Setting and Backgroundmentioning

confidence: 99%

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

2016

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We present a method to simultaneously constrain both far-field horizontal stress magnitudes (S hmin and S Hmax ) and in situ rock unconfined compressive strength (UCS), using geophysical logging data from two boreholes located 70 m apart that access the uppermost accretionary prism of the Nankai subduction zone . The boreholes sample the same sediments and are affected by the same tectonic stress field, but were drilled with different annular pressures, thus providing a unique opportunity to refine estimates of both in situ stress magnitudes and rock strength. We develop a forward model to predict the angular width of compressional wellbore failures (borehole breakouts), and identify combinations of S Hmax and UCS that best match breakout widths observed in resistivity images from the two boreholes. The method requires knowledge of S hmin , which is defined by leak-off tests conducted during drilling. Our results define a normal to strike-slip stress regime from 900 to 1386 m below seafloor, consistent with observations from seismic and core data. Our analysis also suggests that in situ values of UCS are generally slightly lower that commonly assumed on the basis of published empirical relations between UCS and P-wave velocity.

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“…The result by DSDP Leg 31 (sites 299-302 in Fig. 1) only indicated the younger limit for them as late Miocene (5-1OMa), because the drilling could not reach the base ment (Karig et al, 1975). In 1989, ODP Leg 127 and 128 could succeed in recovering volcanic rocks of the basement, though most of them are regarded to be sills.…”

Section: Various Approachesmentioning

confidence: 99%

Radiometric age and Sr isotope characteristics of volcanic rocks from the Japan Sea floor.

Kaneoka

1990

Geochem. J.

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Based on the radiometric age (mostly K-Ar and 40Ar 39Ar ages) and isotopic ratio data for volcanic rocks recovered from the Japan Sea floor, the formation age and the characteristics of magma sources for these volcanic rocks are discussed.Most volcanic rocks from the Yamato and Japan Basins, where oceanic crusts are presumed to exist, show radiometric ages of less than 20Ma. Igneous rocks dredged from such areas as continental remains are conjectured show radiometric ages of more than 100 Ma. Volcanic activity in the Yamato Bank area along the borderland of the Yamato Basin seems to have ceased after 20Ma, which might have related to the formation of the Yamato Basin. Combining such data with the detailed information on the obtained ages, the formation of the Yamato Basin has been inferred to have started prior to 17Ma and not later than around 25Ma. The Japan Basin probably formed almost at the same period or slightly earlier.87Sr/86Sr ratios for volcanic rocks are systematically different between the Yamato Basin and the Yamato Bank together with continental shelf areas: the former indicate values of 0.7035-0.7040, whereas the latter of higher than 0.7045. This might reflect the difference in the degree of incorporation of continental crustal materials.

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Initial Reports of the Deep Sea Drilling Project, 31

Cited by 283 publications

References 1 publication

Age Estimation of the Japan Sea on the Basis of Stratigraphy, Basement Depth, and Heat Flow Data

Age Estimation of the Japan Sea on the Basis of Stratigraphy, Basement Depth, and Heat Flow Data

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

Radiometric age and Sr isotope characteristics of volcanic rocks from the Japan Sea floor.

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