Late Triassic compositional changes of aeolian dusts in the pelagic Panthalassa: Response to the continental climatic change

Nakada, Ryoichi; Ogawa, Kōichi; Suzuki, Noritoshi; Takahashi, Satoshi; Takahashi, Yoshio

doi:10.1016/j.palaeo.2013.10.014

Cited by 58 publications

(50 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The anomalous interval of low-dust and low-silica was followed by resumption of "normal" Carnian bedded radiolarites. Cyclostratigraphy using precession cycles of this episode in these bedded cherts suggests a duration close to 0.9 myr (Nakada et al, 2014), which is similar to the duration estimated in the Germanic Basin for the Stuttgart Formation (Kozur and Bachmann, 2010).…”

Section: A Warmer and Wetter Worldsupporting

confidence: 74%

“…A sudden and temporary shift from a relatively drier-cooler arid climate with extensive deserts and dust storms to a wetter-humid world is reflected in a reduction in atmospheric dust fallout into those oceanic sediments (Nakada et al, 2014). This reduction in land-derived dust was accompanied by a reduction in the essential iron-nutrients needed for the productivity of plankton, therefore a slowdown in the rate of silica-rich deposition from radiolarian tests.…”

Section: A Warmer and Wetter Worldmentioning

confidence: 99%

See 1 more Smart Citation

The mysterious Mid-Carnian “Wet Intermezzo” global event

Ogg

2015

J. Earth Sci.

View full text Add to dashboard Cite

Approximately 230 million years ago in the middle of the Carnian stage of the Upper Triassic, the sedimentary records in different regional basins display dramatic changes. Tropical carbonate platforms abruptly ended, and engorged river systems left widespread sand-rich layers across inland basins and coastal regions. This pulse lasted less than a million years in some basins, but constituted a permanent shift in others. Following this event, the Late Carnian has the earliest record of significant dinosaurs on land and the emergence of the calcareous nannoplankton in the oceans that now govern Earth's carbon cycle. This "most distinctive climate change within the Triassic" has been interpreted by some geoscientists as a global disruption of the Earth's land-ocean-biological system. The eruption of the Wrangellia large igneous province may have been the trigger for a sudden carbon-dioxide-induced warming and associated increased rainfall in some of these regions. Indeed, some workers have proposed that this "wet intermezzo" warming event is a useful analog to aid in predicting the effects of our future greenhouse on land ecosystems and ocean chemistry. However, the understanding of the onset, duration, global impacts and relatively rapid termination of this postulated warming pulse has been hindered by lack of a global dataset with inter-calibrated terrestrial and marine biostratigraphy, precise radio-isotopic ages, stable isotope records of temperature and the carbon system, and cycle-calibrated rates of regional and global change.

show abstract

Section: A Warmer and Wetter Worldsupporting

confidence: 74%

Section: A Warmer and Wetter Worldmentioning

confidence: 99%

The mysterious Mid-Carnian “Wet Intermezzo” global event

Ogg

2015

J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Further discussion of Fe K-edge XANES were conducted related to Fe species in the sediments and mineral airborne dust based on the linear combination fitting for possible Fe minerals contained in natural samples (Takahashi et al, 2011;Nakada et al, 2014). Consequently, the spectra of the surface sediments can be wellfitted by the combination of the spectra of ferrihydrite, illite, and chlorite.…”

Section: Early Diagenesis Effects On Mn Nitrate and Fe In The Sedimmentioning

confidence: 99%

“…Another possible component that should be considered for the fitting of Fe K-edge XANES is montmorillonite (Oinuma and Kobayashi, 1966;Griffin et al, 1968), but the similarity of Fe K-edge XANES between montmorillonite and illite (Nakada et al, 2014) makes it difficult to distinguish the two minerals only by XANES due to the similarity of coordination of Fe in the two minerals. As a result, fitting of the XANES spectra by those of montmorillonite, chlorite, and ferrihydrite gave similar results to those in Fig.…”

Section: Early Diagenesis Effects On Mn Nitrate and Fe In The Sedimmentioning

confidence: 99%

Transfer of rare earth elements (REE) from manganese oxides to phosphates during early diagenesis in pelagic sediments inferred from REE patterns, X-ray absorption spectroscopy, and chemical leaching method

et al. 2015

Self Cite

View full text Add to dashboard Cite

tool to estimate sedimentary environment at the time of deposition of sediments (Chaudhuri and Cullers, 1979; Nath et al., 1997). In particular, the cerium (Ce) anomaly is a decent redox indicator of the depositional environment and has been widely employed in geochemical studies (Shimizu and Masuda, 1977; Palmer, 1985; Wang et al., 1986). To develop REE pattern as a geochemical tool for sediments or sedimentary rocks, the host phases of REEs within the sediments or sedimentary rocks should

show abstract

“…Moreover, XAFS analysis can be performed without any special treatment, such as the digestion or powdering of plagioclase crystal, and thus enables us to conduct subsequent magnetic and microscopic measurements using the same plagioclase crystal. The Fe K‐edge XAFS analysis has recently been applied to geological materials to determine the oxidation states of Fe in silicate glass (Wilke et al, ; Kelley & Cottrell, ; Cottrell et al, ) and Fe‐bearing clay minerals in sedimentary rocks (Ikeda et al, ; Nakada et al, ). In the current study, Fe K‐edge XANES was measured to determine the averaged valence state of Fe in a single plagioclase crystal.…”

Section: Introductionmentioning

confidence: 99%

Variation of Iron Species in Plagioclase Crystals by X‐ray Absorption Fine Structure Analysis

Nakada

Sato

Ushioda

et al. 2019

Geochem Geophys Geosyst

Self Cite

View full text Add to dashboard Cite

Speciation analysis of Fe in single plagioclase crystals separated from two different gabbros was performed to understand the crystallization mechanisms of magnetite exsolution. Iron species in single crystals were measured using Fe K‐ and LIII‐edge X‐ray absorption fine structure (XAFS) analysis. The K‐edge pre‐edge analysis showed variation in the averaged valence state of Fe in plagioclase crystals even if they had been separated from the same gabbro that was further confirmed by the LIII‐edge analysis. The K‐edge pre‐dedge analysis also suggests the various degrees of contribution from tetrahedral Fe. The mixing of tetrahedral and octahedral Fe leads to an underestimation of the averaged valence state of Fe for the K‐edge pre‐edge analysis; thus, we adopted the LIII‐edge result for the valence state of Fe in plagioclase crystals. Iron K‐edge extended XAFS (EXAFS) analysis of two plagioclase crystals separated from the same gabbro clearly showed different coordination environments. A weakening of EXAFS oscillation was recognized in one sample, because two Fe–O bonds (Fe3+–O1 and Fe2+–O2) cancelled out the oscillations of each other. The EXAFS spectrum of the other plagioclase crystal suggested a homogeneous distribution of Fe. The content of exsolved magnetite in these crystals is nearly identical, indicating that the exsolution of magnetite in plagioclase crystal had been completed before the temperature decrease that stopped the ordering of Fe ions in tetrahedral sites.

show abstract

Late Triassic compositional changes of aeolian dusts in the pelagic Panthalassa: Response to the continental climatic change

Cited by 58 publications

References 61 publications

The mysterious Mid-Carnian “Wet Intermezzo” global event

The mysterious Mid-Carnian “Wet Intermezzo” global event

Transfer of rare earth elements (REE) from manganese oxides to phosphates during early diagenesis in pelagic sediments inferred from REE patterns, X-ray absorption spectroscopy, and chemical leaching method

Variation of Iron Species in Plagioclase Crystals by X‐ray Absorption Fine Structure Analysis

Contact Info

Product

Resources

About