Sedimentary history and provenance analysis of the Sanbagawa Belt in eastern Kii Peninsula, Southwest Japan, based on detrital zircon U–Pb ages

Jia, Sui; Takeuchi, Makoto

doi:10.1016/j.jseaes.2020.104342

Cited by 11 publications

(8 citation statements)

References 75 publications

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“…In addition to the ductile deformation features, the studied region also displays several northwest–southeast oriented faults (Figure 2; Takeuchi, 1996; Jia & Takeuchi, 2020). The boundary between the Kayumi and Iitaka units coincides with clear discontinuities both in lithology (Figure 2) and structural elements including orientations of the Ls and Fu axes (Figure 4b).…”

Section: Structural Analysismentioning

confidence: 95%

“…Detrital grains of quartz are rarely elongate and studies of psammitic rocks with less clear signs of ductile strain in the southern part of the study area show aspect ratios close to 1. Detrital feldspar tends to show elongate shapes due to fracturing of the mineral grains along their cleavage planes (e.g., figure 5d in Jia & Takeuchi, 2020). For these reasons we consider our results to represent good estimates of the true strain.…”

Section: Ds Strain Analysismentioning

confidence: 99%

“…This boundary also corresponds to a sudden change in metamorphic grain size and a switch from penetrative to spaced tectonic foliation (Figure 3a,b). Based on U–Pb detrital zircon ages, Jia and Takeuchi (2020) suggest the Iitaka unit can be sub‐divided into the Haze, Hachisu, and Mayoidake subunits. However, the apparent depositional–accretional ages show significant variation between the samples for each suggested unit, and changes in the detrital source of the units may occur without the need for a tectonic boundary.…”

Section: Geological Settingmentioning

confidence: 99%

“…This boundary also corresponds to a sudden change in metamorphic grain size and a switch from penetrative to spaced tectonic foliation (Figure 3a,b). Based on U-Pb detrital zircon ages, Jia and Takeuchi (2020) suggest the Iitaka unit can be sub-divided into the Haze, Hachisu, and Mayoidake subunits.…”

Section: Geology Of Central Kii Peninsulamentioning

confidence: 99%

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Recognition of broad thermal anomaly around the median tectonic line in central Kii peninsula, southwest Japan: Possible heat sources

Yamaoka

Wallis

2022

Island Arc

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Application of Raman spectroscopy of carbonaceous material thermometry to samples of metasedimentary rock from the low‐grade Sanbagawa belt in the central Kii peninsula reveals a progressive decrease in temperature from ~390 °C close to the northern boundary, a major continental shear zone—the median tectonic line (MTL)—to ~270 °C and ~7 km to the south and roughly constant temperature distribution thereafter. Within the Sanbagawa belt, the thermal structure is not significantly modified by slip‐on fault boundaries between different geological units or folding. Meso‐ and microstructural observations combined with strain analysis using detrital grains in meta‐mudstone indicate a similar deformation history throughout the area and no correlation between ductile strain and temperature gradients. These observations suggest the observed thermal structure was developed after the main stages of ductile deformation of the Sanbagawa belt were complete and are not due to localized preferential exhumation along with the MTL. The observations also require a heat source along with the MTL. Order of magnitude estimates suggest the influx of warm fluid along the MTL are viable causes of the observed thermal anomaly. Although shear heating would be another possible explanation, thermal calculations require anomalous fast slip rates along the MTL and much greater frictional strength than generally considered reasonable. For these reasons, fluid infiltration is our preferred model.

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Section: Structural Analysismentioning

confidence: 95%

Section: Ds Strain Analysismentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geology Of Central Kii Peninsulamentioning

confidence: 99%

See 2 more Smart Citations

Recognition of broad thermal anomaly around the median tectonic line in central Kii peninsula, southwest Japan: Possible heat sources

Yamaoka

Wallis

2022

Island Arc

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“…Naturally, peninsulas are formed around mineral deposits with the intervention of tides and currents over time. As the peninsula forms, the nearby surface is populated by plants and mineral residues (Jia and Takeuchi, 2020;Senaratne and Dissanayake, 1982). When civilizations are built around these areas, though the original mineral deposits are likely to be preserved, new and alien substances will be introduced to the environment.…”

Section: Introductionmentioning

confidence: 99%

Single-target mineral detection with site-specific endmember extraction for survey points identification: A case study of Jaffna, Sri Lanka

Ranasinghe¹,

Weerasooriya²,

Herath³

et al. 2021

Preprint

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As field surveys used for manual lithological mapping are costly and time-consuming, digital lithological mapping (DLM) that utilizes remotely sensed spectral imaging provides a viable and economical alternative. Generally, DLM has been performed using spectral imaging with the use of laboratory-generated generic endmember signatures. However, the use of generic signatures is error-prone due to the presence of site-specific impurification processes. To that end, this paper proposes generating a single-target abundance mineral map for DLM, where the generated map can further be used as a guide for the selection or avoidance of a field survey. For that, a stochastic cancellation-based methodology was used to generate a site-specific endemic signature for the mineral in concern to reduce the inclusive nature otherwise present in DLM. Here, single-target detection allows the generation of a more accurate site-specific signature for lithological mapping as opposed to multi-target detection. Furthermore, a soil pixel alignment strategy to visualize the relative purity level of the target mineral has been introduced in the proposed work. Then, for the method validation, mapping of limestone deposits in the Jaffna peninsula of Sri Lanka was conducted as the case study using satellite-based spectral imaging as the input. It was observed that despite the low signal-to-noise ratio of the input hyperspectral data the proposed methodology was able to robustly extract the rich information contained in the input data. Further, a field survey was conducted to collect soil samples of four sites chosen by the proposed DLM from the Jaffna peninsula as an algorithm validation and to demonstrate the application of the proposed solution. The proposed abundance threshold of 0.1 -a hard decision boundary for limestone presence and absence -coincided with the industrial standard X-ray diffraction (XRD) threshold of 5 % for the mineral presence. The results of the XRD test validated the use of the algorithm in the selection of sites to be surveyed, hence could avoid conducting a costly field survey on the assumption of the existence of a mineral. Then a more rigorous survey may be performed, if required, only if the proposed digital lithological survey affirms.

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Provenance analysis of the Cretaceous Gyeongsang Basin, SE Korea: A synthesis and tectonic implications for active continental margin in East Asia

Lee

Choi

2023

Earth-Science Reviews

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Sedimentary history and provenance analysis of the Sanbagawa Belt in eastern Kii Peninsula, Southwest Japan, based on detrital zircon U–Pb ages

Cited by 11 publications

References 75 publications

Recognition of broad thermal anomaly around the median tectonic line in central Kii peninsula, southwest Japan: Possible heat sources

Recognition of broad thermal anomaly around the median tectonic line in central Kii peninsula, southwest Japan: Possible heat sources

Single-target mineral detection with site-specific endmember extraction for survey points identification: A case study of Jaffna, Sri Lanka

Provenance analysis of the Cretaceous Gyeongsang Basin, SE Korea: A synthesis and tectonic implications for active continental margin in East Asia

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