Comptes Rendus Geoscience最新文献_第4页

A cryptotephra from the Upper Pleistocene volcanism of the Bas-Vivarais in the sedimentary infilling of the Chauvet-Pont d’Arc cave (Ardèche, France) 下维瓦莱地区上更新世火山活动中的一种隐孢子虫(法国ard<e:1>区)

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-05-04 DOI: 10.5802/CRGEOS.52

J. Pastre, É. Debard, Catherine Ferrier, M. Fialin, B. Gély, Bertrand Kervazo, Frédéric Maksud, F. Mokadem, S. Nomade, N. Rividi, Ségolène Saulnier-Copard

{"title":"A cryptotephra from the Upper Pleistocene volcanism of the Bas-Vivarais in the sedimentary infilling of the Chauvet-Pont d’Arc cave (Ardèche, France)","authors":"J. Pastre, É. Debard, Catherine Ferrier, M. Fialin, B. Gély, Bertrand Kervazo, Frédéric Maksud, F. Mokadem, S. Nomade, N. Rividi, Ségolène Saulnier-Copard","doi":"10.5802/CRGEOS.52","DOIUrl":"https://doi.org/10.5802/CRGEOS.52","url":null,"abstract":"A cryptotephra belonging to the Upper Pleistocene volcanism of the Bas-Vivarais was identified for the first time in the sedimentary infilling of the entrance area of the Chauvet-Pont d’Arc cave. This slightly reworked tephra fall is characterized by its heavy minerals assemblage, among which magnesian olivine, enstatite, and chromian diopside issued from peridotites and olivine and diopside of basaltic origin. This composition likely refers to a phreatomagmatic eruption of a maar crater. The 14C datings of the cryptotephra beds are contemporaneous with the Aurignacian settlement and paintings, that is, an age slightly older or close to 36 ka. Among the maar craters from the Bas-Vivarais, the Ray-Pic maar have the closest 40Ar/39Ar age (36.2±11.3/32.2±11.1 ka). By contrast, the Vestide du Pal, the biggest maar crater of this country, seems to have a younger age, but the 40Ar/39Ar dating was measured on a basalt which could have occurred later and been the source of the tephra fall, since its tephras contain the same minerals of unknown origin as those found in Chauvet cave. This discovery strengthens the previous hypothesis according to which the humans living in the Chauvet-Pont d’Arc area during the Upper Paleolithic have witnessed eruptions from the Bas-Vivarais volcanic field and","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46319380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Lead abundances in bony fish from the world oceans: significance for contaminated marine habitats and environmental policies 世界海洋硬骨鱼的铅丰度：对受污染的海洋栖息地和环境政策的意义

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-03-31 DOI: 10.5802/CRGEOS.49

A. Véron, Isabelle Bernier, B. Hamelin

{"title":"Lead abundances in bony fish from the world oceans: significance for contaminated marine habitats and environmental policies","authors":"A. Véron, Isabelle Bernier, B. Hamelin","doi":"10.5802/CRGEOS.49","DOIUrl":"https://doi.org/10.5802/CRGEOS.49","url":null,"abstract":"This manuscript presents the largest review of lead (Pb) content in bony fish collected worldwide. Lead analyses are assigned to specific species and localized using the Food and Agricultural Organization geographical fishing zones. The data set is expanded according to the number of analyses in each cohort leading to a record of 22190 and 5954 Pb concentrations for muscle and liver, respectively. Descriptive and comparative statistics demonstrate the usefulness of this chronicle to examine Pb content differences in bony fish from the Atlantic, Indian, Pacific oceans, and basins of the Mediterranean Sea. Investigation of distinct tissues are indicative of contaminated habitat imprints on metabolic Pb accumulation at global and regional scales. Muscle and liver Pb content from all mixed species are significantly correlated above 0.1 ppm (wet weight) suggesting a threshold above which liver metabolism may not efficiently balance uptake and excretion of Pb that accumulates more readily in both tissues. This review constitutes a prerequisite to monitor the effect of environmental policies on fish bioindicators, and to examine interand intraspecies responses to environmental Pb insult according to various habitats and biological factors.","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45978763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Iron isotopes and the redox evolution of Ediacaran sediments 铁同位素与埃迪卡拉纪沉积物氧化还原演化

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-01-27 DOI: 10.5802/CRGEOS.44

F. Moynier, D. Fike, Gabrielle Menard, W. Fischer, J. Grotzinger, A. Agranier

{"title":"Iron isotopes and the redox evolution of Ediacaran sediments","authors":"F. Moynier, D. Fike, Gabrielle Menard, W. Fischer, J. Grotzinger, A. Agranier","doi":"10.5802/CRGEOS.44","DOIUrl":"https://doi.org/10.5802/CRGEOS.44","url":null,"abstract":"The Ediacaran age (ca. 570 Ma) Shuram excursion, a ca. 12h depletion in δCcarb, may record a dramatic oxidation of marine sediments associated with a reorganization of Earth’s carbon cycle closely preceding the rise of large metazoans. However, several geochemical indicators suggest it may instead record secondary processes affecting the sediments such as post-depositional alteration. The stable isotopic composition of iron incorporated within carbonates (δFecarb) reveals an anomalous 56Fe-depletion (down to −1.05h) in strata containing the Shuram excursion, while the underlying and overlying strata have crustal δFecarb values. These depleted δ Fecarb data during the Shuram excursion reflect incomplete reduction of iron oxides, limited by low ambient organic carbon contents. This elevated pulse of sedimentary iron oxides would consume the majority of the limited pool of organic carbon and therefore would give rise to very low net organic carbon burial during a time of enhanced detrital delivery of oxidized iron to the sediments. These results imply a syndepositional origin for the Shuram excursion, which represents a shift in the redox composition of Earth’s sedimentary shell toward more oxidizing conditions, perhaps removing a long-lived buffer on atmospheric","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43895174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sedimentological and sequence stratigraphy analyses of the syn-rift Triassic series of the Mohammedia–Benslimane–ElGara–Berrechid basin (Moroccan Meseta) 摩洛哥梅塞塔Mohammedia-Benslimane-ElGara-Berrechid盆地同裂谷三叠系沉积与层序地层学分析

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-01-15 DOI: 10.5802/crgeos.36

Abdelkrim Afenzar, R. Essamoud

引用次数: 3

Paleobotanical and palynological evidence for the age of the Matzitzi Formation, Mexico 墨西哥Matzitzi组时代的古植物学和孢粉学证据

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-01-15 DOI: 10.5802/CRGEOS.33

U. Villanueva-Amadoz, Marycruz Gerwert Navarro, M. Juncal, J. Díez

{"title":"Paleobotanical and palynological evidence for the age of the Matzitzi Formation, Mexico","authors":"U. Villanueva-Amadoz, Marycruz Gerwert Navarro, M. Juncal, J. Díez","doi":"10.5802/CRGEOS.33","DOIUrl":"https://doi.org/10.5802/CRGEOS.33","url":null,"abstract":"This study addresses some of the stratigraphical problems of the Matzitzi Formation of Puebla and Oaxaca States in Mexico. The age assignment for this unit is controversial although most researchers today accept a Leonardian age (Kungurian, 279.3–272.3 Ma) based on the presence of the gigantopterid Lonesomia mexicana Weber. However, after re-examination of the holotype and two paratypes, the absence of diagnostic taxonomic characters prevents the assignment of this fossil type species to the gigantopterid group. Excluding the presence of gigantopterids in this formation, the macroflora seems to be Permian in age. Samples were collected for palynological analysis to determine the age of the formation. Studied palynological assemblages seem to be reworked and are represented by 18 fossil taxa assigned to the following genera: Calamospora, Deltoidospora, Densosporites, Granulatisporites, Laevigatosporites, Latipulvinites, Lophotriletes, Platysaccus, Punctatosporites, Raistrickia, Schopfipollenites, Thymospora, Triquitrites, Verrucosisporites, and Vesicaspora. Described palynomorphs are likely Late Pennsylvanian according to the presence of Latipulvinites kosankii and Thymospora thiessenii. The biostratigraphic and geochronologic age disparities should be solved in the future.","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45921963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Anticiper l’évolution des territoires 预测领土的演变

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-01-12 DOI: 10.5802/CRGEOS.32

H. L. Treut

引用次数: 0

La Science n’est pas Floue ... 科学并不模糊。。。

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-01-12 DOI: 10.5802/CRGEOS.31

É. Ghys, G. Marsily

引用次数: 0

Le changement climatique, une chance pour l’humanité ? 气候变化，人类的机遇?

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2021-01-12 DOI: 10.5802/CRGEOS.28

M. Delmas-Marty

引用次数: 0

Les batteries sont-elles la bonne option pour un développement durable ? 电池是可持续发展的正确选择吗？

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2020-12-16 DOI: 10.5802/crgeos.27

Jean-Marie Tarascón

{"title":"Les batteries sont-elles la bonne option pour un développement durable ?","authors":"Jean-Marie Tarascón","doi":"10.5802/crgeos.27","DOIUrl":"https://doi.org/10.5802/crgeos.27","url":null,"abstract":"The challenges related to energy storage have led, over the past decade, to a scientific proliferation giving birth to spectacular innovations in battery research. They have contributed in making todays electric mobility a reality, and have been key enablers in the deployment of renewable energies. However, it is legitimate to wonder what will be the battery of the future and, in particular, if this battery will be the right option for sustainable development. This is what this manuscript addresses by discussing many aspects of battery research enlisting performances improvements in terms of autonomy, durability and safety. Moreover it presents on ongoing strategies aiming towards the development of more eco-compatible and smarter batteries, based either on new chemistries enlisting abundant metals (Na-ion), on innovative recycling processes or on the injections of smart sensing and self-healing functionalities. Such a diversity of fundamental scientific challenges emerging from concrete technological bottlenecks generates a myriad of fascinating opportunities to arouse new generation of talented students to take part in this exciting adventure. Mots-clés. Batteries, Énergie, Stockage, Lithium, CO2. ISSN (electronic) : 1778-7025 https://comptes-rendus.academie-sciences.fr/geoscience/ 402 Jean-Marie Tarascon","PeriodicalId":50651,"journal":{"name":"Comptes Rendus Geoscience","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48714264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Quelles transitions pour l’atténuation du changement climatique ? Transformations globales, enjeux sociétaux, et leçons pour la décision 缓解气候变化的过渡是什么？全球转型、社会问题和决策经验教训

IF 1.4 4区地球科学

Comptes Rendus Geoscience Pub Date : 2020-12-16 DOI: 10.5802/crgeos.18

H. Waisman

引用次数: 2