Origin of Cretaceous and Oligocene Kaolinites from the Iwaizumi Clay Deposit, Iwate, Northeastern Japan

Mizota, Chitoshi; Longstaffe, Fred J.

doi:10.1346/ccmn.1996.0440310

Cited by 27 publications

(10 citation statements)

References 45 publications

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“…The majority of δD values of inclusion water in vein quartz fall into a relatively narrow range of about − 50 to − 80‰. Also, most of the H-isotopic data from the Cretaceous ore deposits in the GB are consistent with a paleometeoric water isotopic composition estimated from Japanese Cretaceous kaolinite deposits formed during weathering (Mizota and Longstaffe, 1996). However, the calculated δ 18 O H 2 O values (− 10.3∼5.1‰) of vein quartz from the precious-metal deposits are strongly depleted relative to magmatic waters, indicating that magmatic water contributed little to the ore-forming fluids (Fig.…”

Section: Resultssupporting

confidence: 62%

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The origin and evolution of mineralizing fluids in the Cretaceous Gyeongsang Basin, Southeastern Korea

Choi¹,

Pak²,

Kim³

et al. 2006

Journal of Geochemical Exploration

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Section: Resultssupporting

confidence: 62%

“…A = Meteoric water in equilibrium with Cretaceous kaolinite at 15°C from the Iwaizumi clay mine in Japan (Mizota and Longstaffe, 1996). The isotopic composition of 'subduction-related volcanic vapor' and 'crustal felsic magmas' are referred from Hedenquist and Lowenstern (1994).…”

Section: Resultsmentioning

confidence: 99%

The origin and evolution of mineralizing fluids in the Cretaceous Gyeongsang Basin, Southeastern Korea

Choi¹,

Pak²,

Kim³

et al. 2006

Journal of Geochemical Exploration

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“…Second, neoformed terrigenous clay minerals developed during weathering typically refl ect the isotopic composition of regional precipitation and associated soil water (Mizota and Longstaffe, 1996;Stern et al, 1997;Gilg, 2000). Such weathering is accelerated under warmer and more humid conditions (either year-round or seasonal).…”

Section: Implications Of the Oxygen Isotope Signature Of The Clay Framentioning

confidence: 99%

Clay assemblage and oxygen isotopic constraints on the weathering response to the Paleocene-Eocene thermal maximum, east coast of North America

John

Banerjee

Longstaffe

et al. 2012

Geology

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The Paleocene-Eocene thermal maximum, a transient global warming event, is characterized by extensive evidence of a more active hydrological cycle. This includes a widespread pulse of kaolinite accumulation on continental margins, viewed as the by-product of either enhanced chemical weathering consistent with much more humid conditions and/or increased erosion of previously deposited laterites. The former would be more consistent with yearround humid conditions, whereas the latter might be indicative of extreme seasonal precipitation patterns. To assess these hypotheses, we present a new high-resolution clay mineral assemblage and oxygen isotope record from Bass River, a site on the New Jersey margin (east coast of North America), which shows a sharp rise in the abundance of kaolinite beginning a few thousand years before the onset of the carbon isotope excursion (CIE). The δ 18 O of the <2-µm-size fraction exhibits a shift toward lower values during the event. On the basis of a coeval shift in clay assemblages, the shift in δ 18 O Clays can be explained by a shift in the relative percent of the primary clay phases rather than a change in the isotopic composition of kaolinite, as would be expected if the kaolinite had been produced primarily during the Paleocene-Eocene thermal maximum. This fi nding points to accelerated exhumation and erosion of kaolinitic soils, most likely Cretaceous laterites.

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“…Numerous studies have focused on the exchangeability of oxygen and hydrogen isotopes in phyllosilicate minerals (O'Neil and Kharaka, 1976;Bird and Chivas, 1988;Kyser and Kerrich, 1991;Mizota and Longstaffe, 1996). Results from both laboratory and fi eld studies indicate that mineral hydrogen may be susceptible to postformational isotopic exchange, through the process of proton exchange, in the absence of a mineralogic or chemical change.…”

Section: Retention Of Primary δD Compositions?mentioning

confidence: 99%

Mineralogical and geochemical evolution of a basalt-hosted fossil soil (Late Triassic, Ischigualasto Formation, northwest Argentina): Potential for paleoenvironmental reconstruction

Tabor

Montañez

Zierenberg

et al. 2004

Geol Soc America Bull

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Reconstruction of paleoclimatic conditions in the Ischigualasto basin, northwestern Argentina, has been constrained by fi eld studies coupled with mineralogic, whole-rock, and fi ne-fraction chemical and stable isotope analysis of a Triassic (Carnian) basalt-hosted fossil soil. Field evidence, such as wedgeshaped aggregate structure and slickensides, indicate this was likely a paleo-Vertisol. Whole-rock analysis defi nes down-profi le trends in clay mineralogy and chemical composition that are consistent with modern soils developed upon basalt parent material. X-ray diffraction analysis indicates that the basaltic parent material is dominated by plagioclase with trace amounts of weathered 2:1 phyllosilicate. Overlying weathered horizons show a progressive loss of plagioclase and an increase in phyllosilicates with minor amounts of kandite clays and detrital quartz. X-ray diffraction analysis of the <2 µm fraction shows that the weathered layers are dominated by dioctahedral smectite (montmorillonite) with a minor fraction of kaolinite in the upper layers of the profi le. There is a progressive loss of basic cations in conjunction with an increase in concentration, on a wt% basis, of conservative elements from the basalt upward through the weathering profi le. The combined data indicate that this soil likely formed on a stable landscape in a cool and humid climate. In addition, the presence of quartz in the paleosol profi le suggests an eolian contribution of sediment during pedogenesis. Despite these apparent morphologic and bulk chemical trends indicative of a pedogenic origin, none of the authigenic minerals formed in isotopic equilibrium. However, based on measured oxygen and hydrogen isotope compositions, these minerals apparently formed from meteoric waters with a narrow range of δ 18 O and δD compositions at different temperatures. If this is correct, then amygdaloidal calcites formed at ~60-100 °C, followed by precipitation of montmorillonites at 49-57 °C during late-stage hydrothermal alteration. Finally, goethite formed at low temperatures of 6 ± 3 °C in a pedogenic environment. This complex history of hydrothermal alteration and pedogenic overprinting brings to light the need for cautious interpretation of bulk chemical trends in paleosols as a means for paleoclimate reconstruction. Comparison of the calculated Triassic oxygen isotopic compositions of meteoric water and soil temperature with modern environments suggests that this soil formed in a seasonal, humid, and cool climate.

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Origin of Cretaceous and Oligocene Kaolinites from the Iwaizumi Clay Deposit, Iwate, Northeastern Japan

Cited by 27 publications

References 45 publications

The origin and evolution of mineralizing fluids in the Cretaceous Gyeongsang Basin, Southeastern Korea

The origin and evolution of mineralizing fluids in the Cretaceous Gyeongsang Basin, Southeastern Korea

Clay assemblage and oxygen isotopic constraints on the weathering response to the Paleocene-Eocene thermal maximum, east coast of North America

Mineralogical and geochemical evolution of a basalt-hosted fossil soil (Late Triassic, Ischigualasto Formation, northwest Argentina): Potential for paleoenvironmental reconstruction

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