Conodont and radiolarian biostratigraphic age constraints on Carnian (Upper Triassic) chert-hosted stratiform manganese deposits from Panthalassa: Formation of deep-sea mineral resources during the Carnian pluvial episode

Tomimatsu, Yuki; Onoue, Tetsuji; Rigo, Manuel

doi:10.1016/j.marmicro.2021.102084

Cited by 5 publications

(11 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Julian (lower Carnian) samples from the stratigraphic interval from the LBCh to Mn units are characterized by relatively uniform and unradiogenic 187 Os/ 188 Os i values (Fig. 2 ): 0.393–0.748 (average = 0.487) in the Takahira section; 0.268–0.411 (average = 0.351) in the Tamaiwa section; 0.349–0.448 (average = 0.402) in the Kanzaki section; and 0.197–0.308 (average = 0.270) in the Otaniyama section 187 Os/ 188 Os i values of the UBCh units during the Tuvalian 1 (lowermost Carnian) 13 are higher than those of the Mn, MCh, and LBCh units (Supplementary Table S1 ).…”

Section: Resultsmentioning

confidence: 99%

“…The occurrence of smectite is based on Nakada et al 12 . The radiolarian and conodont biozones are based on Tomimatsu et al 13 , 16 and Sugiyama 51 . Abbreviations: CZ = Conodont zone, RZ = Radiolarian zone, NCIE = Negative carbon isotope excursion, Pa .…”

Section: Discussionmentioning

confidence: 99%

“…Acceleration of the hydrological cycle may have played an important role in the recovery from suboxic to anoxia in the Panthalassa. Notably, Mn ore deposits were only formed on the younger oceanic-plate sediments of the Panthalassa 13 during the recovery to an oxic ocean. Younger oceanic-plate sediments in the Jurassic accretionary complexes of Japan may have been deposited in the vicinity of the Wrangellia LIP, because they were adjacent to the oceanic plate that records the eruption of the Carnian oceanic basalts (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…S2 ). Detailed lithostratigraphic and biostratigraphic studies of these sections have been reported by Tomimatsu et al 13 (Supplementary Fig. S2 ).…”

Section: Geological Settingmentioning

confidence: 99%

“…In addition, the pelagic successions have described significant mid-Carnian lithological changes during the CPE from bedded cherts to manganese deposits (Supplementary information). It has been suggested that these manganese deposits may have been formed with the changes in marine redox conditions in the CPE 13 .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Pelagic responses to oceanic anoxia during the Carnian Pluvial Episode (Late Triassic) in Panthalassa Ocean

Tomimatsu,

Nozaki,

Onoue

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

The Carnian Pluvial Episode (CPE) was a short interval of extreme rainfall in the Late Triassic that caused significant changes in marine ecosystems. Global warming induced by Wrangellia volcanism is thought to have resulted in oceanic anoxia during the CPE, but the global extent, duration, and severity of anoxia, and its effects on major marine taxa, remain unclear. To address this, we examined an equatorial record of conditions in the Panthalassa Ocean during the CPE, focusing on marine Os isotope data, redox conditions, and conodont and radiolarian biostratigraphy. The results show that Wrangellia volcanism peaked in the latest Julian (early Carnian), coinciding with development of reducing conditions in the deep-sea Panthalassa. A strong conodont turnover occurred during the period of oceanic anoxia, whereas radiolarians were less affected and their diversity increased after the recovery from anoxia. The increased radiolarian diversity during the early Tuvalian (late Carnian) can be attributed to chemical weathering and enhanced nutrient fluxes associated with global warming and the more humid climate of Pangea.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…S2 ). Detailed lithostratigraphic and biostratigraphic studies of these sections have been reported by Tomimatsu et al 13 (Supplementary Fig. S2 ).…”

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations