Sedimentology of the Nemuro group (Part II):Radiographic investigation of flysch-type sandstones in the Akkeshi Formation of the Nemuro Group

和雄, 君波

doi:10.5575/geosoc.81.697

Cited by 7 publications

(5 citation statements)

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“…The relationships of major oxides (TiO 2 , Fe 2 O 3 , MgO, K 2 O, Na 2 O, SiO 2 , and Al 2 O 3 ) can be used to classify the tectonic settings of sedimentary rocks [41][42][43][44][45]. The sandstones of the KKGp were mostly plotted in the passive margin field, whereas some fell in the active continental arc (Fig 7A -7C).…”

Section: Provenancementioning

confidence: 99%

“…Thus, the PWF, SKF, PPF, and KKF of the Khorat Group may be formed from sediments of mixed sources (felsic-intermediate rocks) of the continental arc. [44,45], and (D) discriminant function analysis using major oxides [42]. https://doi.org/10.1371/journal.pone.0284974.g007…”

Section: Plos Onementioning

confidence: 99%

“…Numerous studies have shown that the chemical composition of clastic rocks is partly influenced and controlled by tectonic settings, with different tectonic landscapes exhibiting different geochemical characteristics [41][42][43][44][45]. There are three main types of tectonic margins: passive continental margin, active continental margin, and oceanic island arc; these were classified using major and minor oxides in Fig 7A -7C.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…There are three main types of tectonic margins: passive continental margin, active continental margin, and oceanic island arc; these were classified using major and minor oxides in Fig 7A -7C. These tectonic classifications [41][42][43][44][45] revealed that most are deposited in the passive continental margin or intracratonic basin. Furthermore, REE tectonic classification diagrams [41] demonstrate the samples were deposited in either a passive continental margin or intracratonic basin.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…Tectonic-setting discrimination diagrams for the sedimentary rocks in Khon Kaen Geopark. (A) FeO+MgO vs. TiO 2 fields [41], (B) SiO 2 -Log(K 2 O/Na 2 O) diagram [43], (C) basicity diagram[44,45], and (D) discriminant function analysis using major oxides[42].…”

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confidence: 99%

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Geochemistry and provenance of Mesozoic sandstones in Khon Kaen Geopark: Implication for tectonics of the western Khorat Plateau of Thailand

et al. 2023

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Khon Kaen Geopark, representing an area of dinosaur fossil diversity, was selected for investigations to reveal the origin and tectonic setting of the Khorat Group. The area occupied by Mesozoic sedimentary rocks of four formal formations of the Khorat Group, namely the Phra Wihan Formation (PWF), Sao Khua Formation (SKF), Phu Phan Formation (PPF), and Khok Kruat Formation (KKF). A field investigation and macroscopic observations suggested that the immature sedimentary rocks of the study area are mainly clast-supported, pebbly sandstone and siltstone with few calcretes. The 50 rock samples that were selected for petrographical and geochemical investigations revealed that the sandstones of the PWF and PPF are quartz arenite and sublitharenite, with some subarkose, whereas those of the SKF are mainly subarkose and sublitharenite. In addition, the KKF dominantly presents sublitharenite with pebbles and calcretes. Mesozoic sandstones contain quartz, feldspars, various types of rock fragments, and accessory minerals (biotite, muscovite, zircon, and tourmaline), with siliceous, ferrous, and calcareous cement. Petrographic (Q–F–L) and geochemical (major and trace element) data suggested that the sources of sediments are mostly quartzose sedimentary rocks and some felsic-intermediate igneous rocks. Chondrite-normalized rare earth element patterns indicated that the origins of the studied sandstones are quartzose sedimentary rocks deposited in a passive continental margin or an upper continental crust. Geochemical traits of the sedimentary successions demonstrated that the provenance of the Khorat Basin prior to reworking by fluvial processes was situated in the passive continental margin or recycled orogen of the paleo-volcanic arc during the Mesozoic period.

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Section: Provenancementioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%