Mechanism of long-standing Cenozoic basin formation in central Hokkaido: an integrated basin study on an oblique convergent margin
© Itoh et al.; licensee Springer. 2014
Received: 6 January 2014
Accepted: 15 March 2014
Published: 22 April 2014
The basin-forming process along a convergent margin off the eastern coast of Eurasia was pursued on the basis of geological, geochemical, and geophysical approaches. Central Hokkaido has been a site of vigorous tectonic events throughout the Cenozoic reflecting the long-standing subduction of oceanic plates in the region. Geochemical modeling provided an estimate of the eroded Paleogene unit in the study area. Data on the considerable thickness of the missing unit implied continued subsidence of the forearc region and its subsequent exhumation under the emergence of a compressive regime synchronous with the back-arc opening stage. Spatially large facies variety in the Paleogene system suggests that basin compartmentalization occurred as a result of the trench-parallel component of the plate convergence. Right-lateral motion seems to have been the dominant type in Hokkaido and the forearc of northeast Japan since the Late Cretaceous, except for a left-lateral episode during rapid subsidence of the Izanagi Plate around 110 Ma. Numerical modeling demonstrated that dextral slip on a bunch of longitudinal strike-slip faults restored the Neogenedepocenters in central Hokkaido, together with an east-west compressive regime related to an arc-arc collision.
Cenozoic strata in the Ishikari-Teshio Belt, which roughly coincides with the Sorachi-Yezo Belt in the Mesozoic tectonic architecture (Figure 1), are underlain by the Cretaceous Yezo Group that is regarded as a typical sequence in a forearc basin setting (Ando 2003). Compared to monotonous fine sediments of the Yezo Group, the Paleogene system has a large variety of sedimentary facies. We interpret this diversity as being related to the deformation of the forearc by transcurrent fault motions, which has been described on the basis of seismic interpretations. Intricate tectonic events since the Neogene, such as backarc spreading, arc-arc collisions, and hypothetical differential rotation of crustal blocks, should affect the basin-forming process in the Ishikari-Teshio Belt and regional mass balance on the east Eurasian convergent margin. In this paper, we describe significant geological events in the study area, which includes the Ishikari-Teshio Belt and forearc region of northeast Japan (Figure 1), under the same tectonic regime through the Cenozoic. Together with integrated review of basin analyses, our original geochemical data and basin modeling pave a path to the most probable tectonic history of the study area.
Spatio-temporal distribution of Paleogene sediments
Rock-eval pyrolysis, total organic carbon (TOC), and vitrinite reflectance data for the study areas
Total organic carbon
As for bulk analysis samples, total organic carbon (TOC) was measured using a CHN determinator (J-Science LAB JM10, Kyoto, Japan). Samples were powdered and dried as mentioned before. After weighing out about 3 mg of the samples, they were treated with 6 N HCl for an hour to remove carbonate minerals. Decalcified samples were then dried in an oven at 60°C for 2 days and stored in a desiccator. Dried samples were poured into tin containers and analyzed with the CHN determinator. The TOC data are listed in Table 1.
Visual kerogen analyses were conducted on selected samples using a Carl Zeiss MPM-03 microspectrophotometry system (Oberkochen, Germany). Coarsely crushed samples (25 g) were first treated with HCl for 2 h to remove carbonates and HF and HCl for 4 h on a hot plate at 97°C twice to remove silicate minerals. After 1 week, the solution was centrifuged with heavy liquid to separate kerogen. The kerogen was embedded in a resin plug and polished to a flat shiny surface. Measurements of the percentage of incident light reflected from vitrinite particles under oil immersion were conducted using Carl Zeiss MPM-03 at a magnification of ×500. Reflectance with a digital indicator was calibrated on a glass standard in oil. Vitrinite reflectance data (% Ro) are listed in Table 1, and typical histograms are shown in Figure 3b.
To understand burial and exhumation histories of the studied sections, thermal and kinetic modeling was performed using BasinMod 1-D® software at the Technology Research Center of JOGMEC (Japan Oil, Gas and Metals National Corporation, Tokyo, Japan). Additionally, JAPEX in-house basin modeling software BSS® was used. The T max data of the Rock-Eval pyrolysis were converted to vitrinite reflectance (% Ro) data by referring to a built-in conversion table, and then these data were utilized for the maturation modeling. Kinetic models of % Ro data adopted for the programs are after Suzuki et al. (1993; Simple-Ro) and Sweeney and Burnham (1990; Easy-Ro).
At the present time, we do not have clear geologic evidence to adopt a variable heat-flow model. Therefore, we adopted a constant heat-flow model for the whole modeling period, which extended from the Cretaceous to the present, as the first step of the modeling process. Scarce volcanic material in the sedimentary units in Urakawa implies that the geothermal province of the inner arc was far from our study area during the analyzed period; hence, present-day data of 40 mW/m2 that were calculated on the basis of temperature logging and thermal conductivity records at a drilling site in central Hokkaido (Tamaki et al. 2009) were adopted for use in this study. As for the Kitakawaguchi SK-1 and MITI Rumoi, a constant value of 48 mW/m2 (20% higher than Urakawa) was adopted through the consideration of prolonged igneous activities within the adjacent Rebun-Kabato Belt.
In sharp contrast, the one-dimensional modeling for the continental side of the forearc region (Figure 4e,f,g,h) suggests that basin subsidence had been stagnant throughout the late Paleogene, whereas the Neogene period was characterized by drastic subsidence at around 15 Ma. This result is concordant with seismic interpretation data of the Japan Sea side of northern Hokkaido (Itoh et al. 2009), which showed an episode of regional subsidence and change in the basin configuration related to Miocene back-arc spreading. Therefore, our geochemical approach has confirmed the presence of a tectonic episode of extensive longitudinal basin formation during the Paleogene.
Our geochemical analysis has revealed a dynamic process of burial and exhumation in the study area. The authors present a chronicle of the Cenozoic basin formation and related tectonic episodes in the following sections. Then, we evaluate tectonic models for the development of the convergent margin in the light of re-examination of the paleomagnetic data and numerical modeling of basin formation.
Early Paleogene setting
We divided the Paleogene into two stages based on the tectonic context. The middle Eocene setting consists of an initiation of sedimentary basins, and the late Oligocene setting represents a transition to a remarkable transpressional regime on the convergent margin. Sedimentary units in between periods (e.g., Poronai and Momijiyama Formations) have significance for the construction of a paleoenvironmental overview, and numerical modeling of basin formation has been conducted for the Poronai stage (Kusumoto et al. 2013). However, their subsurface distribution needs to be reassessed on the basis of updated biostratigraphic information; hence, we excluded these units from the basin analysis in the present study.
After sporadic basin formation during the Paleocene, the Eocene Ishikari Group in a bay-to-fluvial environment was deposited extensively in the Ishikari-Teshio Belt. Based on the mineral assemblage, Iijima (1959) showed that sand grains of the Ishikari Group were derived from the Kamuikotan metamorphic rocks on the trench side (east) of the depositional areas, a fact which is suggestive of uplift and erosion of the trench slope break on the forearc. The isolated basin of the Ishikari Group was probably connected with the open marine environment by narrow inlets, a recent analogue of which can be seen in the present Sacramento Valley that connects with the Pacific Ocean at San Francisco Bay in California (inset map of Figure 2). It represents the ‘shelved (shallow marine)’ or ‘benched (terrestrial)’ type of forearc after Dickinson (1995). Takano et al. (2013) presented a schematic and conceptual forearc setting model for the Eocene Ishikari basin.
It should be noted here that the sedimentary basin of the Ishikari Group was differentially subsided and can be divided into several compartments (Takano and Waseda 2003). Figure 2 delineates a plan view of the Ishikari sub-basins. As a modern analogue, similar compartmentalization can be observed on the Sunda forearc, where an oblique subduction setting is prevalent (Dickinson 1995). To the south of our study area, the contemporaneous forearc basin of northeast Japan seems to have suffered similar segmentation, and wrench deformation on this region was inferred from paleomagnetic data. Itoh and Tsuru (2006) reported paleomagnetic directions from a borehole on the forearc (MITI Sanriku-oki in Figure 1), which are suggestive of clockwise rotation since the Eocene, and proposed a tectonic model of forearc slivers divided by dextral faults.
Another characteristic of the Eocene basin is acceleration of subsidence. Based on a detailed sedimentological study, Takano and Waseda (2003) pointed out that the rate of subsidence had accelerated during deposition of the Ishikari Group. A contractional regime may have been coexistent during this stage, as was suggested by Takano et al. (2013) and Kusumoto et al. (2013). Kawakami et al. (2002) found fragments of metamorphic rocks from acidic tuff intercalated in a lower Oligocene unit in the Ishikari-Teshio Belt. A low-pressure and high-temperature type of metamorphic material implies considerable uplift and exhumation of the Hidaka Mountains. Existence of acidic tuff layers also suggests that subduction-related volcanism was still active. An Eocene geologic unit linked to an accretion episode was described by Kawakami et al. (2008). Thus, formation/deformation processes of the early Paleogene basins were probably governed by active subduction and transpressional motion on the N-S margin.
Late Paleogene setting
Regional unconformity: seismic interpretation
As predicted by Fitch (1972), prevailing oblique subduction upon the ancient forearc region may have provoked the development of a bisecting transcurrent fault parallel to the trench axis. Its modern analogue can be seen in the Barisan fault in the Sunda arc (Dickinson 1995). The southern part of the possible bisecting fault system was described by Itoh and Tsuru (2006). They found strike-slip faults within the northeast Japan forearc based on seismic interpretations. In this area, a remarkable Oligocene unconformity was found and named as ‘Ounc’ by Osawa et al. (2002). Because the angular unconformity is recognized along the most conspicuous fault on the forearc, this regional uplift and erosion event was probably linked to activation of dextral motions on the fault system.
Description of pull-apart basins
Unique forearc volcanism
Kurita and Yokoi (2000) showed that the Minaminaganuma Formation consists of a lower volcanic unit and an upper clastic unit. Figure 6 (top) depicts the radiometric age histogram obtained from late Oligocene and early Miocene volcanic/volcaniclastic rocks in the southern part of the Ishikari-Teshio Belt. The presence of volcanic material in central Hokkaido is an anomalous phenomenon because the coeval (approximately 30 Ma) volcanic front of northeast Japan was located on the eastern margin of the Japan Sea (Tatsumi et al. 1989). Based on a geochemical study of Takinoue volcanic rocks, which are included in the Takinoue Formation and Minaminaganuma Formation (Figure 1), Okamura et al. (2010) argued that the anomalous volcanism was related to the opening event of the Japan Sea. They also pointed out a linkage between the distribution of volcanic rocks and N-S trending coeval transcurrent faults. Niida (1992) noted that alkali igneous rocks with a high Na2O/K2O ratio occur in restricted areas along transform boundaries, as exemplified by the modern Andaman arc setting. Figure 6 (lower) depicts the geochemical plot for the Mesozoic (Niida 1992) and Oligocene-Miocene (Okamura et al. 2010) volcanic rocks in southern central Hokkaido. The compositional trend of the Oligocene-Miocene (Takinoue) volcanic rocks is in accord with that observed in Grenada, which is located in the vicinity of a major transform plate boundary (Niida 1992). Therefore, activation of the dextral strike-slip movement and formation of a pull-apart basin may have resulted in the formation of a deep crustal rupture and episodic volcanism.
Sedimentary environment during opening of the Japan Sea backarc basin
The Neogene of Japan was heralded by the opening event of the Japan Sea back-arc basin. There are two kinematic models of back-arc opening. One is a ‘double-door’ model based upon paleomagnetism (Otofuji and Matsuda 1983; Otofuji et al. 1994), and the other is a ‘pull-apart’ model deduced from regional tectonics (Lallemand and Jolivet 1985). The former model requires counterclockwise rotation and extensional deformation of Hokkaido adjacent to a pivot of the northern ‘door’ (a drifted coherent landmass). The latter model causes clockwise rotation of domino-style crustal blocks (Takeuchi et al. 1999) in Hokkaido that are situated on a dextral margin of the large rhomboidal back-arc basin. A paleomagnetic study by Tamaki et al. (2010) indicates that these simplistic models cannot account for complicated deformation in Hokkaido. Furthermore, seismic data (e.g., Itoh et al. 2005) indicate intensive deformation and detachment in the upper crust of the Ishikari-Teshio Belt.
Among the Neogene sedimentary units in Hokkaido, lithology of the Takinoue Formation seems to reflect environmental changes during the regional back-arc opening. The lower part of the Takinoue Formation consists of marine sediments in a transgression/regression cycle accompanied with voluminous volcanic material, whereas the upper part was deposited in a transgressive episode and gradually changed into turbidite facies of the overlying Kawabata Formation. Although the lower (ca. 18 to 19 Ma) and upper (<18 Ma) parts of the formation may represent rifting under a transtensional regime and development of elongate basins along the large strike-slip fault system, respectively, further investigations of the stratigraphy and sedimentary facies will be necessary to elucidate the tectonic context of this intriguing unit.
Prevalence of foreland basin setting
Miyasaka et al. (1986) proposed that uplift and massive sediment supplies had commenced in the middle Miocene when large amounts of clastic Hidaka metamorphic rocks appeared in sedimentary basins in the southern part of the Ishikari-Teshio Belt. Kawakami et al. (2008) showed that a part of the strong contraction was accommodated by thrusting of the Paleogene forearc unit, the Niseu Formation. Not only was the onshore sedimentary basin buried, the southern offshore Hidaka-oki basin was buried rapidly as well with the contemporaneous sediments. Itoh and Tsuru (2005) estimated that the rate of burial (equal to the erosion rate of the Hidaka Mountains) was comparable with that of the recent burial episode linked with intensive arc-arc collision tectonics. As stated by Jolivet and Huchon (1989), the geological structure of Hokkaido suggests that the long-standing transcurrent regime had diminished by the late Miocene. As for the northern part of the Ishikari-Teshio Belt, the timing of the remarkable contraction seems to have been later than that of the southern sector. Itoh et al. (2009) showed that an offshore basin on the eastern margin of the Japan Sea accelerated the subsidence rate during the Quaternary, and a half-graben morphology developed. This is an indication of the emergence of the foreland basin setting (Allen and Allen 2005).
Notwithstanding the prevailing compressive regime, our geological review has clarified that the transcurrent component was still significant in the Neogene basin-forming process. As shown in Figure 7 (right), the Kawabata sedimentary basin in the middle Miocene consists of elongate depocenters aligned in an en echelon shape, which implies that there was an effect of right-lateral wrench deformation.
Sense of lateral motion since the Cretaceous
As mentioned before, the structural architecture of the forearc of northeast Japan and the Paleogene basin configuration in central Hokkaido have a tendency towards dextral motion on the major arc-parallel faults. This seems, however, contradictory with reconstruction studies of old terranes in the arc that imply a remarkable Cretaceous sinistral displacement and deformation (e.g., Sasaki 2003), and the tectonic model of Otsuki (1992) that adopted left-lateral transportation of crust blocks along the continental margin.
On comparison with the east Eurasian paleomagnetic reference in Sikhote Alin (Figure 8;Otofuji et al. 2003), Itoh and Amano (2004) pointed out the presence of clockwise (CW) rotation in later periods (Figure 8a). They performed detailed paleomagnetic and structural analyses along the sampling route and found that complicated block rotation since the Cretaceous was governed by a north-trending dextral shear (Figure 8c). Thus, dextral deformation and CW rotation dominantly occurred on the forearc after the demise of the Izanagi Plate. Itoh and Tsuru (2006) inferred a similar rotation sequence (CCW to CW) in the offshore basin of northeast Japan based on remanence directions of the late Cretaceous and Eocene oriented core samples in a deep borehole (MITI Sanriku-oki in Figure 1).
Duration of strike-slip motion: dislocation modeling of basin formation
Our basin study has shown that a wrench deformation occurred in central Hokkaido even under the emergence of the compressive regime in the Miocene. Hence, for semi-quantitative evaluation of the transition of regional tectonic regimes, we attempted to restore the Kawabata sedimentary basin in the middle Miocene on the basis of numerical modeling.
Fault parameters of each fault for the Kawabata stage
Fault zone (ID in Figure 9)
Components of dislocation (km)
Early stage (transpression)
Late stage (compression)
Mass balance on the convergent margin
The Japan Trench is well-known as a typical consuming plate margin governed by the subduction erosion process. In previous studies, the rate of subduction erosion was estimated on the assumption that the Pacific Plate had been steadily subducting underneath northeast Japan (e.g., von Huene and Lallemand 1990; von Huene et al. 1994). However, our model of pull-apart basin formation indicates a considerable amount of south-southeastward migration of the forearc sliver. Itoh and Tsuru (2006) assumed more than 200 km of total migration on the basis of a reconstruction of the conspicuous geomagnetic anomaly on the forearc region. Such migration would have caused thrusting sliver toward the plate boundary and an increased rate of convergence between the oceanic and continental plates. Remarkable forearc unconformity linked with transcurrent faulting may be provoked by such tectonism. Temporal change in subduction erosion rate and mass balance on the Asian convergent margin should be considered on the basis of further integrated basin analyses.
Long-standing subduction of an oceanic plate provoked basin formation on the forearc region including central Hokkaido throughout the Paleogene.
The oblique mode of subduction resulted in compartmentalization of the Paleogene basins and occasional erosion events.
A compressive tectonic episode since the end of Paleogene was reflected as exhumation of the Paleogene basins and emergence of the foreland setting.
Middle Miocene basin morphology in central Hokkaido was successfully reproduced by assuming hybrid fault motions; these included initially right-lateral and subsequently reverse motions in the longitudinal fault zone.
Except for an episodic left-lateral motion event during the Cretaceous, dominant right-lateral slip upon the northeastern Japanese forearc controlled the long-standing basin-forming process until the middle Miocene.
The authors thank the Japan Petroleum Exploration Co. Ltd. (JAPEX) and Japan Oil, Gas, and Metals National Corporation (JOGMEC) for permission to publish this work. We are greatly indebted to S. Okubo, A. Obuse, late Y. Kajiwara, and N. Takeda for their helpful instructions during the course of geochemical analyses in the JAPEX Research Center. Thanks are also owed to H. Kurita for providing us with geological information for sampling routes in Urakawa. Constructive comments by two anonymous reviewers greatly helped to improve an early version of the manuscript.
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