Residual gas in extensive stratified Miocene Izura carbonate concretions exhibiting thermogenic origin and isotopic fractionation associated with carbonate precipitation

Maeyama, Daichi; Suzuki, Noriyuki; Kazukawa, Keisuke; Ando, Hisao

doi:10.1016/j.marpetgeo.2020.104466

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…The low δ 18 O values of the studied samples may be attributed to the mixing of water in the flux. The higher δ 18 O values may be the result of 1) high temperature carbonate fractionation of a carbonatite-like melt (Maeyamaa et al, 2020;Ray and Ramesh, 2000), 2) interaction between the carbon flux and ambient materials from mantle to the magma chamber, and 3) a later-stage influence or alteration from hydrothermal fluid; a similar feature was observed in natrocarbonatites from Oldoinyo Lengai (Keller and Hoefs, 1995). The C-O isotope compositions from the colloform carbonates in Section 5 are consistent with those of hydrothermal origin (δ 13 C VPDB ~ -0.8 to -1.4 and δ 18 O SMOW ~ 17.6 to 18.6, Supplement I); this hydrothermal event may have also affected the rocks in the other sections.…”

Section: Euhedral Pseudomorphic Ankerite Grainsmentioning

confidence: 99%

Carbon flux and alkaline volcanism: Evidence from carbonatite-like carbonate minerals in trachytes, Ulleung Island, South Korea

Chen,

Ren,

Lee

et al. 2022

American Mineralogist

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Section: Euhedral Pseudomorphic Ankerite Grainsmentioning

confidence: 99%

Carbon flux and alkaline volcanism: Evidence from carbonatite-like carbonate minerals in trachytes, Ulleung Island, South Korea

Chen,

Ren,

Lee

et al. 2022

American Mineralogist

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Organic geochemical and petrological evaluation to assess the remaining hydrocarbon potential and depositional conditions: a case study of the Paleozoic shales of west Perlis region, northern Peninsular Malaysia

et al. 2022

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Neogene Taga and Hitachi groups in the Kitaibaraki-Takahagi area, Ibaraki Prefecture, Japan: sedimentary complexes of shelf to slope deposits, submarine channel fills and submarine slide scar fills, reconstructed from lithostratigraphy and diatom biostratigraphy

幸夫

寿男

2020

Bull. Geol. Surv. Japan

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Stratigraphy of the Neogene Taga and Hitachi groups in the Kitaibaraki-Takahagi area (southern Joban area, Ibaraki Prefecture, Japan) has been established based on field survey and diatom biostratigraphic analysis. The both groups are the part of sedimentary sequences deposited in the Early Cretaceous to Recent Off-Joban forearc sedimentary basin.The Miocene Taga group in this area, ranging in age from 16.6 Ma to 7.5 Ma, is a sedimentary complex made of three different kinds of deposits: shelf to slope deposits, submarine channel fills and submarine slide scar fills. The shelf to slope deposits include the Takaku, Kidoba, Kohama, Juogawa and Kushigata formations. In this study, the Takaku Formation, a unit previously treated as a distinct group (Takaku Group), is placed at the lowest part of the Taga Group on the basis of diatom biostratigraphy and field evidence on the stratigraphic relations with below and above. The formation unconformably overlies the Lower Miocene Yunagaya Group, and consists of basal lag conglomerate, poorly stratified bioturbated sandstone in the lower part, and massive sandy mudstone in the upper part. The Kidoba, Kohama, Juogawa and Kushigata formations are composed of diatomaceous massive mudstone or sandy mudstone deposited in the slope environment. The submarine channel fills of the Taga group consist of mudstone and sandstone that buried 18 small submarine channels (0.3 to 1.2 km in width) incised into the submarine slope environment. They form a nested sedimentary complex, preserving discrete 14 units (Units T1-T14) separated by erosional surfaces with hiatuses from each other, although Unit T13 is not distributed in this area. The stacking patterns of submarine channel fills reflects alternate periods of erosion and deposition and the long-lived nature of the channels ranging several million years. Although some units of the channel fills are composed of sandstone deposited from turbidity current, much of the units are characterized by hemipelagic massive diatomaceous mudstone with thin sandstone layers. Each of the submarine channel fills shows a synclinal structure that probably formed by post-burial compaction of mudstone. As submarine slides scar fills of the Taga Group, two units (the Takado and Kokaigahama Units) are recognized in the uppermost part of the group. The both units consist of sandy mudstone and mudstone overlying shelf to slope deposits of the Kohama and Kushigata formations, respectively with sharp and flat erosional surfaces.The Hitachi Group distributed in the souther part of the studied area and the further southwars ranges in age from latest Miocene (ca. 7 Ma) to Pliocene (ca. 3 Ma). The group consists of 11 units (Units H1-H11) of submarine channels fills produced by repeated burial and re-incision within channels. Among 11 units, Units H6-H11 are distributed in this area, most of which are composed mainly of sandy mudstone, and to the lesser amount, interbedded mudstone and sandstone, and amalgamated thick sandstone. Five small submarine channels of 0.3-0....

show abstract

Residual gas in extensive stratified Miocene Izura carbonate concretions exhibiting thermogenic origin and isotopic fractionation associated with carbonate precipitation

Cited by 3 publications

References 47 publications

Carbon flux and alkaline volcanism: Evidence from carbonatite-like carbonate minerals in trachytes, Ulleung Island, South Korea

Carbon flux and alkaline volcanism: Evidence from carbonatite-like carbonate minerals in trachytes, Ulleung Island, South Korea

Organic geochemical and petrological evaluation to assess the remaining hydrocarbon potential and depositional conditions: a case study of the Paleozoic shales of west Perlis region, northern Peninsular Malaysia

Neogene Taga and Hitachi groups in the Kitaibaraki-Takahagi area, Ibaraki Prefecture, Japan: sedimentary complexes of shelf to slope deposits, submarine channel fills and submarine slide scar fills, reconstructed from lithostratigraphy and diatom biostratigraphy

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