Volume 11 - 2023 | https://doi.org/10.3389/feart.2023.1185241 This article is part of the Research TopicBiogeochemical Changes Across the Mesozoic–Paleogene Climate ExtremesView all 7 articles The end-Triassic mass extinction event (ETE) is considered to be linked with the emplacement of the Central Atlantic magmatic province (CAMP) yet their temporal relation and underlying nature of global environmental and biotic changes remain controversial A drastic radiolarian faunal turnover was associated with deep-sea acidification and changes in the chemical composition of pelagic terrigenous components which were interpreted as the results of increased CAMP-derived materials we re-examined these CAMP-like signatures in terms of changes in the chemical composition of the Triassic–Jurassic pelagic deep-sea chert succession in Japan Our newly compiled dataset suggests that changes in Fe2O3/Al2O3 and MgO/Al2O3 across the ETE were not significant they may not be appropriate proxies for CAMP-derived material potentially due to the dissolution of iron by ocean acidification and the formation of chlorite during diagenesis Decreased SiO2/Al2O3 was also considered to have been reflected in increased CAMP-related dust flux and/or decreased biosiliceous productivity but a slight increase in the Al2O3/TiO2 ratio (a biosiliceous productivity proxy) and an increase in shale bed thickness (dust flux proxy) across the radiolarian ETE imply increased eolian dust flux rather than decreased productivity statistically significant Na enrichment at the radiolarian ETE level might be related to CAMP volcanism and/or associated changes in the source areas of eolian dust To test the significance of changes in these proxies across the ETE we statistically compared these proxies derived from our newly compiled major elemental data below and above the ETE in the Inuyama area Although most of the changes in the previous ratios were not statistically significant μm-scale Na enrichment and increased shale bed thickness across the ETE imply increased eolian dust flux on pelagic Panthalassa which may be related to the continental climate change across the ETE Based on a 50-Myr travel history until the subduction during the Late Jurassic the distance from the paleoshoreline at Katusyama and Kurusu sections traveled before accretion can be assumed to be 1,500–3,000 km using a convergence rate of 3–6 cm/yr FIGURE 3. Stratigraphic changes in geochemical data across the Triassic–Jurassic (T–J) transition at the Katsuyama section, Inuyama, Japan. MgO/Al2O3, Fe2O3/Al2O3, SiO2/Al2O3, Al2O3/TiO2, and Na2O/Al2O3 ratios are according to the studies of Okada et al. (2015) and Fujisaki et al. (2016) Further independent analyses will be necessary to clarify the origin of organic carbon and the organic carbon isotope correlation considering the sedimentation rate of these sections as ca these Hg anomalies in our section are not necessarily derived from CAMP volcanism but possibly from other sources To examine the bulk chemical signature of the end-Triassic extinction event in deep-sea chert succession we compared these proxies of newly compiled data between pre- and post-ETE levels at the Katsuyama and Kurusu sections across the end-Triassic extinction considering the several times higher concentrations of elements other than SiO2 in shale samples relative to chert this analytical precision should be high enough to conduct statistical analyses Past version 4 software application was used for statistical analyses (Hammer et al., 2001). Although the sampling patterns of the two sections are different, we can compare the difference in the median of selected elemental data between pre- and post-ETE at the 95% confidence level, shown as no overlapping notches in the box and jitter plot (Figure 4; Chambers et al., 1983) Overlap of all (chert + shale) samples between pre-ETE and post-ETE are shown to emphasize that variations in those proxies between chert and shale are larger than those across the ETE due to large impact of diagenetic segregation and precession-scale environmental changes MgO/Al2O3 and Fe2O3/Al2O3 seem not to be appropriate proxies for CAMP-derived eolian dust although we cannot rule out this possibility Although CAMP volcanic material may fly to pelagic Panthalassa we cannot deny the possible formation of authigenic Na-aluminosilicate and its identification will need essential criteria the expansion of dust source regions in Pangea across the ETE may contribute to Na-enriched dust input into the pelagic Panthalassa Further provenance analyses will be needed to clarify CAMP volcanism and associated environmental changes recorded in the pelagic deep-sea succession It is noteworthy that the migration of biogenic Si from proto-shale intervals to adjacent proto-chert intervals during the diagenetic transformation from opal-A to opal-CT (Tada, 1991) suggests that SiO2/Al2O3 ratios in shales tend to be similar to those of eolian dust, while those in cherts reflect the biogenic Si content within a chert and adjacent shale beds per terrigenous material content in the proto-chert interval (e.g., Ikeda et al., 2017) a decrease in SiO2/Al2O3 ratios in chert does not necessarily imply a change in eolian dust composition but rather indicates a decrease in the biogenic Si content and/or an increase in the terrigenous content such changes cannot be explained by increased CAMP-derived material these factors need to be examined to understand the increased eolian dust burial flux in the pelagic deep-sea chert across the end-Triassic radiolarian turnover interval yet their age uncertainty needs to be improved such vegetation collapse may contribute to the increased eolian dust emission Further convincing evidence for eolian dust flux and its chemical composition will clarify this idea and deepen our understanding of the global environmental dynamics across the ETE This study examined the temporal relationship between the end-Triassic radiolarian extinction and CAMP volcanism based on the stratigraphic changes in chemical compositions of deep-sea cherts deposited in pelagic Panthalassa previously used signatures of CAMP-related eolian dust may not be appropriate due to authigenic/diagenetic formation of chlorite dissolution of magnetite and hematite by deep-ocean acidification statistically significant Na enrichment at the lowermost purple shale may reflect increased CAMP-derived material and/or changes in the provenance of eolian dust a decrease in SiO2/Al2O3 in conjunction with insignificant changes in Al2O3/TiO2 and an increase in shale bed thickness imply that increased eolian dust flux potentially reflects the expansion of the arid areas and wind gustiness due to CAMP volcanism and associated environmental perturbation MI and MB compiled the major element dataset MI primarily wrote the manuscript with input from MB and TC All authors contributed to the article and approved the submitted version This research was partly supported by grants from the Japan Society for the Promotion of Science 18K13647 and 19H02012 awarded to MI Julien (Shizuoka University) for their critical discussion The authors are grateful to the associate editor and reviewers for providing suggestions and comments that helped improve the manuscript The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest All claims expressed in this article are solely those of the authors 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Received: 13 March 2023; Accepted: 16 June 2023;Published: 17 July 2023 Copyright © 2023 Ikeda, Cho and Bôle. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use distribution or reproduction in other forums is permitted provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited in accordance with accepted academic practice distribution or reproduction is permitted which does not comply with these terms *Correspondence: Masayuki Ikeda, aWtlZGEubWFzYXl1a2lAZXBzLnMudS10b2t5by5hYy5qcA== Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher 94% of researchers rate our articles as excellent or goodLearn more about the work of our research integrity team to safeguard the quality of each article we publish Spots Cherry Blossom・Autumn Leaves there are many spots where you can enjoy barbecues and outdoor activities with the cherry blossoms and you can enjoy cherry blossom viewing at your leisure with your family and friends we will introduce 8 cherry blossom and flower viewing spots near Obihiro and Kushiro that are perfect for this coming season There are also places where you can see late-blooming cherry blossoms so you can enjoy the cherry blossoms for a long period of time by combining them with other areas This park is loved by many as the latest cherry blossom viewing spot in Japan At the Cherry Blossom Festival held every May you can enjoy cherry blossom viewing while watching local performing arts and other events There is a management building with a shop A campsite surrounded by a forest that is famous for its cherry blossoms in spring It is equipped with bungalows and a barbecue area that can accommodate up to 60 people There is a mountain stream nearby where you can fish and splash around in the water so you can enjoy outdoor activities in addition to cherry blossom viewing The adjacent "Fureai no Mori" is a scenic spot that has been selected as one of the Otobetsu New Eight Views and the autumn leaves are also spectacular was built as if it were embraced by Cape Barasan The grounds of Kokutai-ji Temple are one of the most famous cherry blossom spots in Hokkaido the old cherry tree with the most intensely colored flowers is the one that blooms and has long branches that spread out in all directions this park has over a thousand Siberian cherry trees (Ooyamazakura) making it a famous cherry blossom viewing spot In addition to Siberian cherry trees and Yaezakura trees It is also the venue for Akkeshi's signature events such as the Cherry Blossom and Oyster Festival in the spring and the Oyster Festival in the fall located on a small hill near the Tokachi Ohashi Bridge is a popular spot for cherry blossoms in spring you can also see the pretty and delicate lily of the valley flowers The park is surrounded by nature and is home to wild birds and Hokkaido squirrels This park is one of the most famous cherry blossom viewing spots in Obihiro City and is beautiful with cherry blossoms in the spring and autumn leaves in the fall You can also see a rich variety of wildlife There is also a Wildflower Garden where you can observe about 380 species of plants native to Tokachi and an 8-hectare lawn area called Green Park where you can enjoy a sense of openness that you can't experience in the city located on a hill overlooking Shimizu city including beautiful cherry blossoms in spring There is also a park golf course with a spectacular view of the Tokachi Plain and the park is bustling with people who come to experience a variety of outdoor activities [7 minutes walk from Sapporo Station] Enjoy hot springs A comfortable stay at the 605-room "Sapporo Hotel by Granbell" [Updated for 2025] A complete guide to accessing Daiwa House Premist Dome (Sapporo Dome) and nearby hotels "So cute it's unfair" - Feel the healing power of a sleeping miniature horse [Information on the early opening on April 25th] Sapporo Odori's newest attraction Floor details and highlights of "4PLA" opening in summer 2025 A hotel in the center of Sapporo with a superb sauna and large public bath Experience the warmth that is unique to Hokkaido at "Danyuki Sapporo" [2025 Edition] 7 recommended cherry blossom spots in the Kitami and eastern Hokkaido areas Enjoy cherry blossom viewing in the great outdoors Seasonal “news” of Hokkaido can be checked by category You can check the information of your “town” in one place Events” held throughout the province are easy to find and can be saved This page has been automatically translated by Google Translate service