Vertical changes of depositional environments of the Lower to Middle Miocene Kadonosawa Formation based on analyses of fossil ostracode faunas

Irizuki, Toshiaki; Matsubara, Takashi

doi:10.5575/geosoc.100.136

Cited by 27 publications

(31 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Three shallow coldwater genera, Finmarchinella, Hemicythere and Kotoracythere, defined by Matsubara (1994, 1995), also occurred in this sandstone ( Figure 10; Table 2). However, these three taxa were not found in assemblages from (Yajima, 1992;Irizuki and Matsubara, 1994;Tanaka et al, 2004Tanaka et al, , 2012b. These genera were dominant in the upper horizons of Ninohe during 16.4-15.0 Ma (in the NPD3B and 4A zones) in the upper part of the Kadonosawa and Suenomatsuyama formations Matsubara, 1994, 1995; Figure 11).…”

Section: Water Temperature Of Shallow Watermentioning

confidence: 91%

“…1 (e.g. Yajima, 1992;Irizuki and Matsubara, 1994;Irizuki, 2003;Tanaka et al, 2004Tanaka et al, , 2012b. These were warm-subtropical species during the Miocene (Irizuki, 2003;Goto et al, 2013).…”

Section: Water Temperature Of Shallow Watermentioning

confidence: 96%

“…The depositional period of the two mudstone members in Yatsuo, with bathyal ostracods, correlates to the appearance period of warm-water shallow-sea ostracods in the Mizunami, Kanazawa, Tomioka and Ota areas and lower horizons of the Ninohe area (lower part of the Kadonosawa Formation), with numerous subtropical warm-water ostracod and molluscan assemblages characteristic of Japan (Figure 11; e.g. Irizuki and Matsubara, 1994;Amano et al, 2004;.…”

Section: Temperature Of Bathyal Watermentioning

confidence: 97%

“…The Japan Sea began to open as a marginal sea around 20 Ma, caused by back-arc spreading due to pull-apart opening, until 15 Ma (Otofuji et al, 1994;Hoshi and Takahashi, 1999;Hoshi et al, 2006;Baba et al, 2007;Yanai et al, 2010;Sawada et al, 2013). Major geological and tectonic events in this region from the early to middle Miocene led to drastic changes of the aquatic environment from freshwater lakes to shallow seas and deep-sea basins with corresponding changes of benthic faunas (Chinzei, 1991;Tada, 1994;Ogasawara, 1994;Irizuki and Matsubara, 1994;Uemura, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Ozawa

2016

Paleontological Research

View full text Add to dashboard Cite

Section: Water Temperature Of Shallow Watermentioning

confidence: 91%

Section: Water Temperature Of Shallow Watermentioning

confidence: 96%

Section: Temperature Of Bathyal Watermentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Ozawa

2016

Paleontological Research

View full text Add to dashboard Cite

“…3: Barron and Gladenkov (1995). 4: Samata (1976), Koizumi (1986), Irizuki and Matsubara (1994). 5: Ishizuka and Uto (1995).…”

Section: Geology Sampling and Tilt Correctionmentioning

confidence: 99%

Early Miocene paleomagnetic results from the Ninohe area, NE Japan: Implications for arc rotation and intra-arc differential rotations

Hoshi

Matsubara

2014

Earth Planet Sp

Self Cite

View full text Add to dashboard Cite

We have carried out a paleomagnetic study on well-dated Early Miocene volcanic rocks from the Ninohe area in northern NE Japan. Dacitic welded tuffs ranging from 24 to 21 Ma possess westerly paleomagnetic directions with normal polarity (formation-mean: D/I = 294.5°/44.2° with α 95 = 8.3°, 8 sites), while the andesite flows formed at 17 Ma exhibit southerly directions with reversed polarity (D/I = 186.6°/-61.9°, 2 sites). A positive conglomerate test assures the stability of high-temperature components of remanent magnetization. Our results demonstrate that northern NE Japan rotated counter-clockwise through more than 60° between 21 and 17 Ma, most likely in association with the opening of the Japan Sea. The rotation of northern NE Japan thus preceded the about 15 Ma rapid clockwise rotation of SW Japan, and was synchronous with the possible pre-16 Ma southward translation of it. In comparison with published data, we further suggest that intra-arc block rotations occurred in the back-arc region of NE Japan during and after the arc rotation.

show abstract

Slip Inversion Along Inner Fore‐Arc Faults, Eastern Tohoku, Japan

et al. 2017

View full text Add to dashboard Cite

The kinematics of deformation in the overriding plate of convergent margins may vary across timescales ranging from a single seismic cycle to many millions of years. In Northeast Japan, a network of active faults has accommodated contraction across the arc since the Pliocene, but several faults located along the inner fore arc experienced extensional aftershocks following the 2011 Tohoku‐oki earthquake, opposite that predicted from the geologic record. This observation suggests that fore‐arc faults may be favorable for stress triggering and slip inversion, but the geometry and deformation history of these fault systems are poorly constrained. Here we document the Neogene kinematics and subsurface geometry of three prominent fore‐arc faults in Tohoku, Japan. Geologic mapping and dating of growth strata provide evidence for a 5.6–2.2 Ma initiation of Plio‐Quaternary contraction along the Oritsume, Noheji, and Futaba Faults and an earlier phase of Miocene extension from 25 to 15 Ma along the Oritsume and Futaba Faults associated with the opening of the Sea of Japan. Kinematic modeling indicates that these faults have listric geometries, with ramps that dip ~40–65°W and sole into subhorizontal detachments at 6–10 km depth. These fault systems can experience both normal and thrust sense slip if they are mechanically weak relative to the surrounding crust. We suggest that the inversion history of Northeast Japan primed the fore arc with a network of weak faults mechanically and geometrically favorable for slip inversion over geologic timescales and in response to secular variations in stress state associated with the megathrust seismic cycle.

show abstract

Vertical changes of depositional environments of the Lower to Middle Miocene Kadonosawa Formation based on analyses of fossil ostracode faunas

Cited by 27 publications

References 0 publications

Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Early to Middle Miocene Ostracods from the Yatsuo Group, Central Japan: Significance for the Bathyal Fauna between Japan Sea and Northwest Pacific Ocean During the Back-Arc Spreading

Early Miocene paleomagnetic results from the Ninohe area, NE Japan: Implications for arc rotation and intra-arc differential rotations

Slip Inversion Along Inner Fore‐Arc Faults, Eastern Tohoku, Japan

Contact Info

Product

Resources

About