Cenozoic Fault Zone Activity and Geologic Evolution of the Offshore Regions of Fukushima and Miyagi Prefectures, Northeastern Japan, Based on Petroleum Exploration Data

Arato, Hiroyuki

doi:10.5772/67391

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…In this region, these formations were originally deposited in continuous nonmarine basin formed by extentional tectonics, but subsequent right‐slip faults evolved and have displaced these formations to their present positions. More examples are described in the Wecoma fault in the Cascadia basin, in the offshore Oregon convergent margin (Goldfinger et al., 1996), and at strike‐slip fault zones in the offshore regions of Fukushima and Miyagi, Japan (Arato, 2017).…”

Section: Discussionmentioning

confidence: 99%

Polyphase Deformation and Strain Migration on the Septentrional‐Oriente Fault Zone in the Windward Passage, Northern Caribbean Plate Boundary

et al. 2021

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Oblique collision between the Caribbean plate and the Bahama Banks has lead an eastward migration of the northern Caribbean plate boundary by successive southward jumps of major strike‐slip faults. The Septentrional‐Oriente Fault zone (SOFZ) defines the present‐day northern Caribbean plate boundary accommodating most of the eastward escape of the Caribbean plate. Here, we reevaluate the complex history of the SOFZ along the Windward Passage area between the easternmost region of Cuba and the northwest of Haiti. Based on seismic reflection and swath‐bathymetric data set we interpret the structure and tectonic pattern of the Windward Passage. The tectono‐sedimentary framework of this large strait shows contrasting patterns of deformation linked to a complex polyphase tectonic history of dominantly strike‐slip faulting. SOFZ segments offset the seismic units and yield key markers of displacement along the fault system. Our study provides structural and stratigraphic insights into the relative timing of deformation along the Windward Passage and presents new elements that constrain the southeastward jump of the north Caribbean plate boundary to its present‐day position. We propose dates for the identified seismic units based on the correlation of offshore deformation phases recorded in the Windward Passage sedimentary cover with major paleogeographic reorganization episodes described onland (Late Eocene, Late Oligocene, Middle Miocene and Late Pliocene). By restoring the offset of the seismic units, we demonstrate that at least ∼80 km of left‐lateral motion has occurred on the SOFZ, and that the SOFZ has been active since the Pliocene.

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Section: Discussionmentioning

confidence: 99%

Polyphase Deformation and Strain Migration on the Septentrional‐Oriente Fault Zone in the Windward Passage, Northern Caribbean Plate Boundary

et al. 2021

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“…The opening of the Sea of Japan was the most significant geological event in the Cenozoic, leading to the right‐lateral rotation of the NE Japan arc and left‐lateral transcurrent faults (known as tectonic lines) across the NE Japan arc (Figures 1b, 2 and 3) (Baba & Yoshida, 2020; Kimura et al, 2014; Kimura & Tamaki, 1986; Nakajima, 2013, 2018). After cessation of the seafloor spreading of the Sea of Japan in the Middle‐Late Miocene, the compressional events in Tohoku occurred successively at 10.5, 6, 3.6 and 1.8 Ma, most likely reflecting the changes in motion of the Pacific Plate (Figure 3) (Arato, 2017; Baba & Yoshida, 2020; Kato, 1996).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The seafloor spreading of the Sea of Japan and the associated right‐lateral rotation of the NE Japan arc have led to a series of large‐scale transcurrent faults known as tectonic lines. These tectonic lines include the northernmost Offshore Hidaka tectonic line, Offshore Sanriku tectonic lines, Hizume‐Kesennuma tectonic lines, Honjo‐Sendai tectonic line and the southernmost Miomote‐Tanakura tectonic line (brown dashed lines with annotated H, S, K, I and T in Figure 2a,b) (Arato, 2017; Baba & Yoshida, 2020; Otsuki & Ehiro, 1992). These tectonic lines run in NW‐SE trending, elongating for several hundred kilometres and spanning mostly across Tohoku.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The ISC is located between the Hizume‐Kesennuma tectonic lines to the north and the Abukuma ridge to the south, very close to the Honjo‐Sendai tectonic line (also known as the Ishinomaki tectonic line in Arato (2017), Figure 2b). The Honjo‐Sendai tectonic line is supposed to be an active (and a catastrophic) tectonic line that is close to Sendai, the administrative center and largest city of Tohoku.…”

Section: Geological Backgroundmentioning

confidence: 99%

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Architecture, formation and implication of active structure‐controlled intraslope channel system southeast offshore Sendai, Tohoku, Japan

et al. 2022

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Located off the Pacific coast of central Tohoku (NE Japan), the Ishinomaki slope channel (ISC) provides an excellent opportunity to study a structure‐controlled intraslope channel and downslope sedimentation along the active margin. The seismic reflection data across ISC show an extensive basal surface and overlying channel complexes between the basement structures of the Abukuma ridge to the south and Kitakami massif to the north, indicating that the formation of the intraslope basin, channelization of ISC and sedimentation of the downstream channel‐lobe transition zone (CLTZ) are very likely to be structure‐controlled. The oblique channel stacking pattern, faulting of the seafloor and subsurface Abukuma ridge in the upper and lower domains of ISC, collectively suggest that ISC has migrated northward and is currently under the influence of active compression. Differences in styles of accommodation space between the upper and lower domains of ISC suggest that differential subsidence occurred along the strike‐slip tectonic line. Based on the regional strike‐slip tectonic line, we propose that a Kitakami‐Abukuma ridge existed before the formation of ISC. The strike‐slip faulting divided the Kitakami‐Abukuma ridge into the Kitakami massif to the north and the Abukuma ridge to the south, and an intervening fault trough as the precursor of the intraslope basin and ISC. As the subduction of the Pacific Plate and associated compressional events continued, the Abukuma ridge was reactivated to narrow the intraslope basin into a confined channel. Located near the epicentre of the devastating 2011 Tohoku earthquake event, the ISC, downstream CLTZ and underlying intraslope basin provide information on active basement structure and the evolving sediment routing system on the tectonically active margin.

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Cenozoic Fault Zone Activity and Geologic Evolution of the Offshore Regions of Fukushima and Miyagi Prefectures, Northeastern Japan, Based on Petroleum Exploration Data

Cited by 2 publications

References 17 publications

Polyphase Deformation and Strain Migration on the Septentrional‐Oriente Fault Zone in the Windward Passage, Northern Caribbean Plate Boundary

Polyphase Deformation and Strain Migration on the Septentrional‐Oriente Fault Zone in the Windward Passage, Northern Caribbean Plate Boundary

Architecture, formation and implication of active structure‐controlled intraslope channel system southeast offshore Sendai, Tohoku, Japan

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