Data report: clay mineral assemblages in the upper Shikoku Basin, results from IODP Expedition 333, Sites C0011 and C0012

Underwood, Michael B.; Guo, Junhua

doi:10.2204/iodp.proc.333.205.2017

Cited by 5 publications

(7 citation statements)

References 24 publications

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“…However, on this >20 Ma lithosphere, the highest temperatures in the sediments (i.e., at the base of the sediment column) at Sites C0011 and C0012 are projected to be 79 °C and 64 °C, respectively (Expedition 333 Scientists, 2012a; Expedition 333 Scientists, 2012b). Consistent with those results, the clay-mineral assemblages at these sites show no significant smectite-to-illite reaction progress (Underwood and Guo, 2013;Underwood and Guo, 2017).…”

Section: Nankaisupporting

confidence: 85%

Diagenetic, metamorphic, and hydrogeologic consequences of hydrothermal circulation in subducting crust

et al. 2018

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Section: Nankaisupporting

confidence: 85%

Diagenetic, metamorphic, and hydrogeologic consequences of hydrothermal circulation in subducting crust

et al. 2018

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“…Underwood and Guo (, ) documented the clay mineral assemblages at IODP Sites C0011 and C0012 (Figure ). Just as at Site 1177, they found no empirical evidence for a diagenetic overprint, and both IODP sites yield similar stratigraphic trends in mineral assemblages.…”

Section: Resultsmentioning

confidence: 99%

“…See Underwood et al () for age‐depth models. X‐ray diffraction data are from Underwood and Guo (, ). Enlarged plots highlight linear regression statistics for depositional ages of 10 Ma to Recent.…”

Section: Resultsmentioning

confidence: 99%

“…All of the procedures for sampling, sample processing, X‐ray diffraction (XRD) analysis, determination of normalization factors, and computation of relative mineral abundances have been described thoroughly in a series of IODP data reports (Guo & Underwood, ; Underwood, , ; Underwood & Guo, , ; Underwood & Song, , ). Briefly, those workers isolated the < 2 μm size fraction from core samples and cuttings and scanned glycol‐saturated oriented aggregates for smectite, illite, chlorite, kaolinite, and quartz.…”

Section: Methodsmentioning

confidence: 99%

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The origin of strata within the inner accretionary prism of Nankai Trough: Evidence from clay mineral assemblages along the NanTroSEIZE transect

Underwood

2018

Island Arc

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One of the more prominent architectural elements of the Nankai subduction margin, offshore southwest Japan, is an out‐of‐sequence thrust fault (megasplay) that separates the inner accretionary prism from the outer prism. The inner prism (hanging wall of the megasplay) is dominated by mudstone, which is enigmatic when the sedimentary facies is compared to coeval deposits in the Shikoku Basin (i.e. inputs from the subducting Philippine Sea plate) and to coarser‐grained turbidite sequences from the Quaternary trench wedge. Clay mineral assemblages amplify the mismatches of sedimentary facies. Mudstones from the inner prism are uniformly depleted in smectite, with average bulk values of 23–24 wt%, whereas the Shikoku Basin deposits show progressive decreases in proportions of smectite over time, from averages of 46–48 wt% at 10 Ma to 17–21 wt% at 1 Ma. Plate‐boundary reconstructions for the Philippine Sea region provide one solution to the conundrum. Between 15 Ma and 10 Ma, the Pacific plate subducted near the NanTroSEIZE transect, and a trench‐trench‐trench triple junction migrated to the northeast. Accretion during that period involved sediments that had been deposited on the Pacific plate. Motion of the Philippine Sea plate changed from 10 Ma to 6 Ma, resulting in sinistral slip along the proto‐Nankai Trough. Sediments accreted during that period probably had been deposited near the triple junction, with a hybrid detrital provenance. Renewed subduction of the Philippine Sea plate at 6 Ma led to reorganization of watersheds near the Izu–Honshu collision zone and gradual incision of large submarine canyons on both sides of the colliding Izu arc. Accreted Pliocene mudstones share more of an affinity to the triple junction paleoenvironment than they do to Shikoku Basin. These differences between subducting Shikoku Basin strata and accreted Pacific plate sediments have important implications for interpretations of frictional properties, structural architecture, and diagenetic fluid production.

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“…The core samples and logging data used in this study were acquired at Sites C0006 (Expedition 314 Scientists, 2009a; Expedition 316 Scientists, 2009a) and C0024 (Yamaguchi et al., 2020) in the prism toe, Sites C0001 (Expedition 314 Scientists, 2009b; Expedition 315 Scientists, 2009a) and C0004 (Expedition 314 Scientists, 2009a; Expedition 316 Scientists, 2009b) on the outer ridges, and Sites C0002 (Expedition 314 Scientists, 2009b; Expedition 315 Scientists, 2009b; Strasser et al., 2014b; Tobin et al., 2015; Kitajima et al., 2020) and C0009 (Expedition 319 Scientists, 2010a) in the Kumano Basin (Figure 2). Clay and smectite fractions in sediments were measured by Expedition 319 Scientists (2010a), Guo and Underwood (2012), Underwood (2017a, 2017b), Underwood and Guo (2013, 2017), Underwood and Song (2016), and Yamaguchi et al. (2020).…”

Section: Geological Settingmentioning

confidence: 99%

Multiple Types of Porosity – P‐Wave Velocity Relationships for the Nankai Trough

et al. 2022

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The empirical relationship between the porosity and P‐wave velocity is a useful tool for probing large‐scale underground physical properties and stress states based on P‐wave velocity structures acquired by seismic surveys. In this study, the porosity‐velocity curves were examined using local core sample and logging datasets acquired along the Kumano transect in the Nankai Trough, Southwest Japan. We tested Hashimoto et al.’s (2010) hypothesis that slope apron and accreted sediments have different relationships. Our advantage is using a large amount of logging and core data obtained at multiple sites in the Nankai Trough under various geological conditions, from the incoming oceanic plate to the inner wedge. We identified multiple types of porosity – P‐wave velocity relationships: 1) The first type agrees with the low‐velocity model in the global empirical relation of Erickson and Jarrard 1998), which is observed at lithostatic stress state condition (incoming upper Shikoku basin and slope sediments), 2) The second type consistent with high‐velocity models of the global empirical relation observed at compressive stress state condition (accreted sediments), which have a higher velocity and larger dependence on the porosity than the first type with the same porosity, and 3) The third type for incoming sediments with high smectite content has lower velocity than the first type. Based on our results, the transition between the first and second porosity – velocity relationships occurs in the prism toe, implying that compressive stress due to subduction controls acoustic properties and the lithification process of these sediments.

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Data report: clay mineral assemblages in the upper Shikoku Basin, results from IODP Expedition 333, Sites C0011 and C0012

Cited by 5 publications

References 24 publications

Diagenetic, metamorphic, and hydrogeologic consequences of hydrothermal circulation in subducting crust

Diagenetic, metamorphic, and hydrogeologic consequences of hydrothermal circulation in subducting crust

The origin of strata within the inner accretionary prism of Nankai Trough: Evidence from clay mineral assemblages along the NanTroSEIZE transect

Multiple Types of Porosity – P‐Wave Velocity Relationships for the Nankai Trough

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