Major Strike-Slip Faults and their Bearing on Spreading in the Japan Sea

Otsuki, Kenshiro; Ehiro, Masayuki

doi:10.1007/978-94-009-9535-2_39

Cited by 12 publications

(11 citation statements)

References 40 publications

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“…A second dextral strike-slip shear zone is known along the southeastern coast of Korea and in the Tsushima Strait [Otsuki and Ehiro, 1978]. The NE-trending Yangsan fault offsets the Cretaceous Bulgugsa granites by several tens of kilometers.…”

Section: Sakhalin and Hokkaido Kodama Et Al [1993] Andmentioning

confidence: 99%

Paleomagnetic rotations and the Japan Sea opening

Jolivet

Shibuya

Fournier

1995

Active Margins and Marginal Basins of the Western Pacific

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The apparent incompatibility of the classical "bar door" opening model of the Japan Sea based on paleomagnetic studies and the pull-apart geometry based on the observation of shear zones in and around Japan is symptomatic of a lack of understanding of the tectonic history of the Japan Sea. After a critical review of paleomagnetic data and a discussion on the possible error bars we present information concerning the internal strain of the Japan arc during the opening. We show that it is possible to integrate both sets of data in a single model, provided that some of the paleomagnetic rotations are due to distributed deformation of SW and NE Japan and not to a rigid body rotation of 600 km long blocks. Rotations occur at all scales and the 50 ø of clockwise rotation of southwest Japan is the sum of 30 ø of rotation of southwest Japan as a whole and of 20 ø due to internal deformation. The amount of paleomagnetic rotation is then compatible with the kinematics based on the internal structure of the Japan Sea and the geometry of major dextral shear zones. The rigid body rotation of southwest Japan is accommodated by extension and left-lateral motion along the Median Tectonic Line which is a second order fault between the two major dextral shear zones that bound the Japan Sea to the east and to the west. The problem of the apparent instantaneous rotation of southwest Japan as opposed to the progressive opening of the Japan Sea probably results from the way paleomagnetic data and radiometric dates are averaged. PROBLEM SETTINGThe past ten years have seen the development of a debate on the opening mechanism of the Japan Sea ( Figure 1). An important breakthrough was made by Otofuji et al.short period, less than 2 m.y. long, about 15 Ma. The model is that of a double rotation about two nearby poles and a double fan-shaped opening of the Japan Sea. The rigid behavior of the two continental blocks, each of them being more than 500 km long, implies that oceanic crust formation in the Japan Sea was contemporaneous with the rotation. A rapidly opening model was then postulated in concert with rapid rates of motion of the rotating blocks.Based on different data, Lallemand and Jolivet [ 1985] postulated that major dextral strike slip faults guided the opening of the Japan Sea in a pull-apart manner, in opposition with the fan-shaped kinematics of Otofuji et al.Later Jolivet et al. [1989, 1991] and Jolivet and Tamaki [1992] introduced block rotations in the pull-apart model, describing the whole region as a wide dextral shear zone (Figure 2). 356 PALEOMAGNETIC ROTATIONS AND THE JAPAN SEA OPENING JOLIYET ET AL. 357 JOLIVET ET AL. 359

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Section: Sakhalin and Hokkaido Kodama Et Al [1993] Andmentioning

confidence: 99%

Paleomagnetic rotations and the Japan Sea opening

Jolivet

Shibuya

Fournier

1995

Active Margins and Marginal Basins of the Western Pacific

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“…It has been widely accepted that the Tan‐Lu Fault Zone had played the most important role in the understanding of the late Mesozoic tectonic framework of East Asia. Some earth scientists have discussed the Cretaceous strike–slip events along the eastern margin of the Asian continent (Otsuki & Ehiro 1978; Taira et al 1983; Xu (ed.) 1993; Otsuka 1996); however, the Late Cretaceous strike–slip nature of the Tan‐Lu Fault Zone has been paid little attention.…”

Section: Introductionmentioning

confidence: 99%

Strike–slip origin of Cretaceous Mazhan Basin, Tan‐Lu Fault Zone, Shandong, east China

Hong

Miyata

1999

Island Arc

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The Mazhan Basin, Shandong Province, China, is located between the main faults, F3 and F4, of the Tan‐Lu Fault Zone. It is an elongated basin more than 60 km in length and 8 km in width and contains a series of typical continental sediments (the Upper Cretaceous Wangshi Group). This series was divided into three sedimentary facies associations: conglomerate facies association; sandstone facies association of alluvial fan to lake margin environment; and siltstone facies association of lacustrine origins. Their zonal distribution pattern may represent a contemporaneous heterotopic facies due to a lateral facies change from margins to axis of the basin. Their stratigraphic sequence becomes younger northward along the boundary faults. This suggests that the depocenter of the fan–lake system tends to migrate northward along F3. From the asymmetric features (i.e. basin shape, lithofacies distribution, facies change) the Mazhan Basin can be explained by progressive subsidence at the Tangwu releasing bend of F3 with sinistral strike–slip movement. Judging from the fission track (FT) ages from the Wangshi Group, it was concluded that a sinistral strike–slip movement along the main fault, F3 of the Tan‐Lu Fault in Shandong, has lasted until the Late Cretaceous. Its displacement is estimated to be larger than the migrated distance, 60 km, of the depocenter of the Mazhan Basin.

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“…late Oligocene to middle Miocene (Kobayashi & Nakada 1978). In the Miocene, the Sea of Japan also began to open, associated with largescale lateral faulting in the eastern and western parts of Japan (Otsuki & Ehiro 1978). The Eo-Nippon Cordillera was detached from the Eurasian Continent at this stage to form the detached type of island arc of Dickinson & Seely (1979).…”

Section: Tectonic Settingmentioning

confidence: 98%

Tectonics of some forearc fold belts in and around the arc-arc crossing area in central Japan

Ogawa

1982

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Summary The zonal structure of the old Honshu arc in central Japan is deflected and cut by the colliding younger Izu-Bonin arc causing peculiar types of accretionary fold belts. The Shimanto Fold Belt (s.s.), made up of Cretaceous flysch and pre-flysch sediments, shows a collisional fold pattern: arcward vergence in the inner side and oceanward vergence on the outer side. The minor structures are also different, with shear folds on the inner side of the belt and lens folds on the outer side. Structures in the inner side grew by flattening and those in the outer side by simple shearing. The divergent development of structural characteristics is explained by the differences in geothermal gradient and stress fields across the belt. The Izu-Bonin arc has a forearc fold belt situated between the Honshu and Izu-Bonin arcs. The stratigraphical, palaeogeographical and structural history of the area shows that it developed in a strike-slip regime associated with the transform fault between the Eurasian and Philippine Sea plates.

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Major Strike-Slip Faults and their Bearing on Spreading in the Japan Sea

Cited by 12 publications

References 40 publications

Paleomagnetic rotations and the Japan Sea opening

Paleomagnetic rotations and the Japan Sea opening

Strike–slip origin of Cretaceous Mazhan Basin, Tan‐Lu Fault Zone, Shandong, east China

Tectonics of some forearc fold belts in and around the arc-arc crossing area in central Japan

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