Asymmetrical melange fabrics as possible indicators of the convergent direction of plates: a case study from the Shimanto Belt of the Akaishi Mountains, central Japan

Kano, Ken‐ichi; Nakaji, Masaya; Takeuchi, Shinji

doi:10.1016/0040-1951(91)90455-2

Cited by 58 publications

(72 citation statements)

References 21 publications

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“…Although all the mélanges with shaly matrix contain only fragments of sandstones formed in situ and do not have blocks of exotic rocks, close spatial relations between the mélange units and D 2 thrust faults, together with the occurrence of non-coaxial brittle deformational structures in the former, argue for origin of these units by tectonic shearing synchronous with the formation of corresponding thrust faults (D 2 event). In general, the mélange units of the Ainyn and Upupkin terranes are very similar to those described in Shimanto Belt of the southeast Japan (Kano, Nakaji & Takeuchi, 1991; mélange type I of Kimura & Mukai, 1991;Needham, 1995) and in southern Alaska (Fisher & Byrne, 1987).…”

Section: B the Second Deformational Event (D 2 )mentioning

confidence: 78%

Structural evolution of the northeast Asian continental margin: an example from the western Koryak fold and thrust belt (northeast Russia)

Khudoley

Соколов

1998

Geol. Mag.

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The western Koryak fold and thrust belt consists of a set of tectonostratigraphic terranes that contain units ranging from Lower Palaeozoic to Cenozoic. Three deformational events have been identified in the study area. The first event structures are folds, domes and shear zones with related high-pressure/ low-temperature metamorphism. These structures are early Carboniferous and are only recognized in the metamorphic terranes. The second event structures are imbricate fans of thrusts and folds with southeast vergence, broken formation and serpentinite mélange. These are latest Jurassic to early Cretaceous (early Albian) and occur throughout the study area. During this event, thrusting was accompanied by dextral strike-slip faulting. The second event structures are overlapped by the Upper Albian sedimentary rocks with an angular unconformity at the base. During metamorphism associated with the first and second deformational events, some of the rocks were metamorphosed to blueschist grade and were affected by strain with axial ratios of up to 15:1. The third deformational event is characterized by significant sinistral strike-slip displacement at higher crustal levels. This resulted in a new set of structures and rotation of pre-existing structures. The age of the sinistral strike-slip faults is interpreted to be late Cretaceous to Cenozoic. The kinematics of the second and third deformational events correspond to assumed proto-Pacific plate motions based on palaeomagnetic data.

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Section: B the Second Deformational Event (D 2 )mentioning

confidence: 78%

Structural evolution of the northeast Asian continental margin: an example from the western Koryak fold and thrust belt (northeast Russia)

Khudoley

Соколов

1998

Geol. Mag.

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“…However, the inherent weathering resistance of the sandstone is generally higher than that of the shale around the Aka-kuzure landslide (Nagai and Nakamura, 2000). Joint spacing in the sandstone (generally N 10 cm) is much wider than that in the shale (generally form several millimeters to 10 cm) that has high-density joints along slaty cleavage (Kano et al, 1986(Kano et al, , 1991Matsuoka and Sakai, 1999). Sandstone sediment which accumulated at the talus cone and in gullies is much smaller than shale sediment accumulation, indicating that the shale is susceptible to surficial rock weathering activities such as diurnal freeze-thaw that actively occurs in the region (Imaizumi et al, 2006).…”

Section: Discussionmentioning

confidence: 96%

Parallel retreat of rock slopes underlain by alternation of strata

et al. 2015

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“…The geological map is according to Kano et al (1991). ISTL, ItoigawaShizuoka Tectonic Line; MTL, Median Tectonic Line.…”

Section: Sampling Sitementioning

confidence: 99%

Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan

et al. 2009

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To identify the methanogenic pathways present in a deep aquifer associated with an accretionary prism in Southwest Japan, a series of geochemical and microbiological studies of natural gas and groundwater derived from a deep aquifer were performed. Stable carbon isotopic analysis of methane in the natural gas and dissolved inorganic carbon (mainly bicarbonate) in groundwater suggested that the methane was derived from both thermogenic and biogenic processes. Archaeal 16S rRNA gene analysis revealed the dominance of H 2 -using methanogens in the groundwater. Furthermore, the high potential of methane production by H 2 -using methanogens was shown in enrichments using groundwater amended with H 2 and CO 2 . Bacterial 16S rRNA gene analysis showed that fermentative bacteria inhabited the deep aquifer. Anaerobic incubations using groundwater amended with organic substrates and bromoethanesulfonate (a methanogen inhibitor) suggested a high potential of H 2 and CO 2 generation by fermentative bacteria. To confirm whether or not methane is produced by a syntrophic consortium of H 2 -producing fermentative bacteria and H 2 -using methanogens, anaerobic incubations using the groundwater amended with organic substrates were performed. Consequently, H 2 accumulation and rapid methane production were observed in these enrichments incubated at 55 and 65 1C. Thus, our results suggested that past and ongoing syntrophic biodegradation of organic compounds by H 2 -producing fermentative bacteria and H 2 -using methanogens, as well as a thermogenic reaction, contributes to the significant methane reserves in the deep aquifer associated with the accretionary prism in Southwest Japan.

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Asymmetrical melange fabrics as possible indicators of the convergent direction of plates: a case study from the Shimanto Belt of the Akaishi Mountains, central Japan

Cited by 58 publications

References 21 publications

Structural evolution of the northeast Asian continental margin: an example from the western Koryak fold and thrust belt (northeast Russia)

Structural evolution of the northeast Asian continental margin: an example from the western Koryak fold and thrust belt (northeast Russia)

Parallel retreat of rock slopes underlain by alternation of strata

Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan

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