Noble gases in mesozoic cherts from the U.S.A. and Japan

Matsubara, Kayo; Matsuda, Jun‐ichi; Sugisaki, Ryuichi

doi:10.1016/0168-9622(91)90011-k

Cited by 8 publications

(8 citation statements)

References 16 publications

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“…(e) Noble gas patterns in cherts from sedimentary systems [30]. (f) The noble gas abundances of cherts from sedimentary systems [30]. Figure 6: (a) Noble gas patterns in obsidians and glasses [31].…”

Section: Discussionmentioning

confidence: 99%

“…(d) The noble gas abundances in shales [4,10,28]. (e) Noble gas patterns in cherts from sedimentary systems [30]. (f) The noble gas abundances of cherts from sedimentary systems [30].…”

Section: Discussionmentioning

confidence: 99%

“…Critical experiments detailing the metamorphic history of sedimentary lithologies combined with noble gas studies should prove interesting. Figure 5e shows the noble gas enrichment pattern of Mesozoic cherts [29,30]. The silica of these sediments includes both biogenic and diagenic components and some samples have a hydrothermal component.…”

Section: Comparison Of Model Concepts and Literature Datamentioning

confidence: 99%

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Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Torgersen

Kennedy

Soest

2004

Earth and Planetary Science Letters

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The mechanisms responsible for noble gas concentrations, abundance patterns, and strong retentivity in sedimentary lithologies remain poorly explained. Diffusion-controlled fractionation of noble gases is modeled and examined as an explanation for the absolute and relative abundances of noble gases observed in sediments. Since the physical properties of the noble gases are strong functions of atomic mass, the individual diffusion coefficients, adsorption coefficients and atomic radii combine to impede heavy noble gas (Xe) diffusion relative to light noble gas (Ne) diffusion. Filling of lithic grains/half-spaces by diffusive processes thus produces Ne enrichments in the early and middle stages of the filling process with F(Ne) values similar to that observed in volcanic glasses. Emptying lithic grains/half-spaces produces a Xe-enriched residual in the late (but not final) stages of the process producing F(Xe) values similar to that observed in shales. 'Exotic …but unexceptional' shales that exhibit both F(Ne) and F(Xe) enrichments can be produced by incomplete emptying followed by incomplete filling. This mechanism is consistent with literature reported noble gas abundance patterns but may still require a separate mechanism for strong retention. A system of labyrinths-with-constrictions and/or C-, Sinanotubes when combined with simple adsorption can result in stronger diffusive separation and nonsteady-state enrichments that persist for longer times. Enhanced adsorption to multiple C atoms inside C-nanotubes as well as dangling functional groups closing the ends of nanotubes can provide potential mechanisms for 'strong retention'. We need new methods of examining noble gases in rocks to determine the role and function of angstrom-scale structures in both the diffusive enrichment process and the 'strong retention' process for noble gas abundances in terrestrial rocks.2

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Section: Discussionmentioning

confidence: 99%

“…(d) The noble gas abundances in shales [4,10,28]. (e) Noble gas patterns in cherts from sedimentary systems [30]. (f) The noble gas abundances of cherts from sedimentary systems [30].…”

Section: Discussionmentioning

confidence: 99%

Section: Comparison Of Model Concepts and Literature Datamentioning

confidence: 99%

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Diffusive separation of noble gases and noble gas abundance patterns in sedimentary rocks

Torgersen

Kennedy

Soest

2004

Earth and Planetary Science Letters

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“…Studying the rare gas in silica can be helpful to understanding the origin and evolution of the volatile components in fluid when it was formed [15] . The research on the abnormity of the He isotopes of the Pacific ridge shows that the bottom hydrothermal fluid diffuses in a plume level way, in a range of 5000 km [16] . This causes the surplus 3 He of seawater.…”

Section: The Origin Of Armentioning

confidence: 99%

“…These spherical particles are usually full of fluid (gas and water, etc.) [12] that can be maintained for a long period of geological time [13,14] . Studying the rare gas in silica can be helpful to understanding the origin and evolution of the volatile components in fluid when it was formed [15] .…”

Section: The Origin Of Armentioning

confidence: 99%

The noble gas isotope geochemical composition of chert at the bottom of Cambrian in Tarim Basin, China

Sun

Chen²,

Zheng

et al. 2009

Sci. China Ser. D-Earth Sci.

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In the Tarim Basin, black shale series at the bottom of Cambrian is one of the important marine facies hydrocarbon source rocks. This research focuses on the analysis of the isotope of noble gas of 11 cherts. The R/R a ratio of chert in the Keping area is 0.032-0.319, and 40 Ar/ 36 Ar is 338-430. In Quruqtagh the R/R a ratio is 0.44-10.21, and 40 Ar/ 36 Ar is 360-765. The R/R a ratio of chert increases with 40 Ar/ 36 Ar from the west to the east accordingly. They have evolved from the crust source area to the mantle source area in a direct proportion. Surplus argon 40 Ar E in chert is in direct proportion to the R/R a ratio, indicating that it has the same origin of excess argon as in fluid and mantle source helium. Comparison of the R/R a ratios between the west and the east shows that the chert in the eastern part formed from the activity system of the bottom hydrothermal venting driven by the mantle source, where the material and energy of crust and mantle had a strong interaction in exchange; whereas in the western part, chert deposited from the floating of hydrothermal plume undersea bottom, which is far away from the centre of activities of the hydrothermal fluid of ocean bottom. In addition, from noble gas isotope composition of chert, it is suggested that the ocean anoxia incident happened at the black shale of the Cambrian bottom probably because of the large-scaled ocean volcanoes and the following hydrothermal activities.Tarim Basin, Cambrian, chert, rare gas isotope Chert is widely spread in a long time span. It may appear under various circumstances from the Archean to modern ocean bottom hydrothermal venting area and the terrestrial hot spring area. It seems that from the formation cause, the older the chert is, the more advantageous the chemical cause of formation would be. However, the biological cause of formation gradually gained advantage since Mesozoic [1] . The cause of formation of marine facies black shale is always being concerned by geologists, but opinions differ, such as the cause of the accident of anoxia. Silica is one of the important rock of black shales [2][3][4][5][6] . It can reflect the ancient environment, the ancient structure, the source of mineralization and other information, etc., because it had a strong resistance against later reconstruction and formed under certain geochemical conditions. So it attracts a wide range of attention from geologists. This paper tries to probe into the construction activities and the interaction between crust and mantle at that time through the research on the rare gas isotope of chert from the black shale at the bottom of Cambrian in the Tarim Basin.

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