REVUE DE MICROPALEONTOLOGIE最新文献

{"title":"Progress on late Paleozoic radiolarians and their biostratigraphic applications – In memory of Martial CARIDROIT","authors":"Taniel Danelian , Paula Noble , Patrick De Wever","doi":"10.1016/j.revmic.2024.100821","DOIUrl":"10.1016/j.revmic.2024.100821","url":null,"abstract":"","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100821"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiolarian age and geochemical characteristics of the Permian bedded chert sequence in the Soi Dao area, Chanthaburi, Southeast of Thailand","authors":"Waraphorn Phromsuwan ,&nbsp;Yoshihito Kamata ,&nbsp;Takuya Hayashi ,&nbsp;Kei-ichi Kobayashi ,&nbsp;Thasinee Charoentitirat ,&nbsp;Katsumi Ueno ,&nbsp;Apsorn Sardsud","doi":"10.1016/j.revmic.2024.100786","DOIUrl":"10.1016/j.revmic.2024.100786","url":null,"abstract":"<div><div><span>Radiolarian<span> assemblages and geochemistry from </span></span>Permian<span> chert<span><span><span><span> and siliceous mudstone in the Soi Dao, Chanthaburi area of southeastern Thailand, are used here to determine the age and </span>depositional environment of these rocks. Moderate-to-well preserved radiolarian were obtained from three study areas, from bedded cherts and siliceous mudstones of Early Asselian to Early Capitanian, </span>Sakmarian to Roadian, and Capitanian to Changhsingian age. Considering the </span>lithofacies<span><span><span>, age, and chemical composition of the rocks, a primary stratigraphy can be reconstructed that consists, in ascending order, of basaltic rocks, radiolarian bedded cherts, siliceous mudstones, and clastics made of alternations of sandstone and mudstone. Geochemical analyses, particularly chondrite-normalized REEs patterns of chert and siliceous mudstone, show a gradual change in the degree of the Ce-negative anomaly, which decrease towards the younger strata. This change indicates that the depositional environment of the Permian rock was at the beginning highly influenced by </span>hydrothermal activity, which decreased with time, while the influx of terrestrial clastics increased. Permian bedded cherts accompanied by </span>basalts and siliceous mudstones recognized in the study area are very similar to the Paleo-Tethys bedded cherts in terms of their lithofacies and microscopic features; however, their depositional period is much shorter, indicating that they were deposited in another oceanic basin (i.e., a back-arc basin). The chemical composition also shows that the influence of hydrothermal activity weakened over time and the influence of terrigenous clastics increased.</span></span></span></div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100786"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141039762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preliminary report on Permian radiolarians from the Numakuma peninsula in Japan: Paleontological evidence for the presence of the Ultra-Tamba Belt","authors":"Tsuyoshi Ito,&nbsp;Daisuke Sato","doi":"10.1016/j.revmic.2023.100751","DOIUrl":"10.1016/j.revmic.2023.100751","url":null,"abstract":"<div><div>Permian<span><span> radiolarians were obtained from </span>mudstone of an accretionary complex cropping out on the Numakuma Peninsula of Japan. The establishment of a Permian age for the mudstone suggests that these rocks belong to the Permian accretionary complex and therefore to the Ultra-Tamba Belt.</span></div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100751"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139297095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Permian radiolarian Neoalbaillella caridroiti assemblage from the Loufanggou, Guangyuan-Shangsi area, Sichuan Province, China","authors":"Kiyoko Kuwahara ,&nbsp;Akira Yao ,&nbsp;Jianxin Yao","doi":"10.1016/j.revmic.2024.100784","DOIUrl":"10.1016/j.revmic.2024.100784","url":null,"abstract":"<div><div><span>A well-preserved Lopingian<span> (Late Permian) radiolarian assemblage including </span></span><em>Neoalbaillella</em> has been recovered from the Loufanggou 2 section of the Dalong Formation in northern Sichuan, China. The assemblage consists mainly of spherical radiolarians with spongy tests, such as Entactinaria and Spumellaria. Albaillellaria and Latentifistularia are relatively rare in the assemblage. The occurrence of <em>Neoalbaillella caridroiti</em> nov. sp., <em>Neoalbaillella antaixiangi</em> Yao and Kuwahara and <em>Albaillella triangularis</em> Ishiga, Kito and Imoto indicates that the Loufanggou 2 section may be correlated with the <em>Neoalbaillella optima</em> assemblage zone. Until now, only <em>Neoalbaillella caridroiti</em> nov. sp. and <em>Neoalbaillella antaixiangi</em> were known to occur in the northern Sichuan area. This limited occurrence indicates the possibility that the Dalong Formation depositional basin in northern Sichuan Province was a geographically limited area, and the radiolarian assemblage shows its provincialism.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100784"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141144007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Guadalupian–Lopingian (Middle–Late Permian) radiolarians from clastic rocks and zircon U–Pb ages of intercalated tuff and tuffaceous sandstone on Sado Island, central Japan","authors":"Toshiyuki Kurihara ,&nbsp;Keisuke Suzuki ,&nbsp;Tsuyoshi Ito ,&nbsp;Hirotaka Ishida ,&nbsp;Hayato Ueda ,&nbsp;Atsushi Matsuoka","doi":"10.1016/j.revmic.2023.100750","DOIUrl":"10.1016/j.revmic.2023.100750","url":null,"abstract":"<div><div><span>We investigated Permian<span><span> strata in the Ota area of the Kosado Hills, Sado Island, central Japan, and their depositional ages were determined based on radiolarian </span>biostratigraphy<span> and zircon U–Pb dating. We also focused on the geology of the region and its lithologic correlation with other geological units in the Inner Zone of Southwest Japan. The radiolarian analysis identified the presence of </span></span></span><em>Follicucullus porrectus</em> and <em>F. dilatatus</em><span> in mudstone exposed on the coastline of Ota, indicating a middle–late Capitanian to early Changhsingian age. Mudstone exposed along the forest road in the Ota area contained </span><em>Cariver charveti</em>, suggesting a late Capitanian–early Changhsingian age. Zircon U–Pb dating of the tuff layer intercalated within the <em>Follicucullus</em>-bearing mudstone yielded a weighted-mean age of 259.9 ± 2.0 Ma, corresponding to a Capitanian–Wuchiapingian age. The tuffaceous sandstone interbedded with mudstone containing <em>C. charveti</em><span> yielded a weighted-mean age of 264.1 ± 6.3 Ma, which covers the Roadian to Wuchiapingian ages. The youngest model peak age (256.6 ± 2.6 Ma; Wuchiapingian) provides the most reliable estimate of the maximum depositional age. The Paleozoic strata in the Kosado Hills have previously been correlated with the Ultra-Tamba and Maizuru belts in Southwest Japan based on fossil<span> occurrences. Our findings indicate that the Permian rocks in the Kosado Hills exhibit differences in lithology from those in the Ultra-Tamba belt but share similarities with the upper Guadalupian–Lopingian strata in the Maizuru belt.</span></span></div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100750"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136009398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Desmoinesian (middle Pennsylvanian) radiolarians from the Excello Shale of Kansas, USA","authors":"Galina P. Nestell ,&nbsp;John P. Pope ,&nbsp;Merlynd K. Nestell","doi":"10.1016/j.revmic.2024.100772","DOIUrl":"10.1016/j.revmic.2024.100772","url":null,"abstract":"<div><div><span>Desmoinesian (Middle Pennsylvanian) radiolarians<span> are described from carbonate concretions found in the black phosphatic facies in strata of the Excello Shale Member of the Fort Scott Limestone (Marmaton Group) in southeastern Kansas (K69 section), USA. Ten new species of radiolarians are described: </span></span><em>Albaillella kansaensis, Holdsworthella trifurca, Pseudoalbaillella deformata, Entactinia jayhawkensis, E. heckeli, E. boardmani, Apophysiacus martiali, Moskovistella insolita, Palacantholithus umbrelliformis</em>, and <em>Ormistonella perrara</em>. The Kansas radiolarian assemblage is different from the assemblage described from the Excello Shale of Iowa in the preservation and taxonomic composition. The radiolarians are preserved as pyritized internal molds or regular tests replaced by pyrite, and unidentifiable organic material. The domination of entactinarians and albaillellarians in the Kansas assemblage and their poor to excellent preservation indicate the formation of early diagenetic calcareous concretions in anoxic conditions. The appearance of the spicular radiolarian genus <em>Palacantholithus</em><span> indicates an influx of relatively cold water connected with upwelling. The Kansas location was much farther offshore (450 km basinward) compared to the Iowa localities suggesting a difference in thermocline depth, affecting water temperature, oxygenation, and nutrients.</span></div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100772"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140277137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Late Paleozoic radiolarians from the Kozuki Formation of the Ultra-Tamba Terrane in the Kanbayashi area, northern Kyoto Prefecture, Southwest Japan","authors":"Yoshiaki Sugamori ,&nbsp;Kotomi Ikeda","doi":"10.1016/j.revmic.2024.100806","DOIUrl":"10.1016/j.revmic.2024.100806","url":null,"abstract":"<div><div>The Ultra-Tamba Terrane within the Inner Zone of Southwest Japan is interpreted as a Guadalupian (Middle Permian) to Lopingian (Late Permian) subduction-related accretionary complex. The Kozuki Formation is the UT3 unit of the terrane and is mainly present in eastern Okayama and western Hyogo prefectures. Recently, it was shown that the Kozuki Formation is also distributed in the Kanbayashi area of northern Kyoto Prefecture based on the similarity of its lithological features and tectonic position. The exact age of the formation was unknown until now. In this study, radiolarian fossils are discovered in two sections, allowing for the determination of the ages of cherts and clastics within the Kozuki Formation. The cherts yielded radiolarians such as <em>Curvalbailella u-forma</em> (Holdsworth and Jones) and <em>Curvalbailella chilensis</em> (Ling and Forsythe), which indicate a latest Carboniferous or early Cisuralian, Early Permian age, and the mudstones yielded radiolarians such as <em>Latentifistula banchengensis</em> Wang, <em>Pseudotormentus</em> cf. <em>kamigoriensis</em> De Wever and Caridroit, <em>Quadriremis gracilis</em> (De Wever and Caridroit), which indicate Guadalupian to Lopingian, but most likely Guadalupian, age. This study establishes the Kozuki Formation in the studied area as a part of the UT3 unit of the Ultra-Tamba Terrane, confirms its age correlation with other regions, and emphasizes the northeasternmost extension of the unit.</div></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"85 ","pages":"Article 100806"},"PeriodicalIF":0.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143094405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Middle Triassic and middle Permian radiolarians from the Kamitaki Complex in the Sasayama area, Hyogo Prefecture, Southwest Japan: Evidence for Triassic plate subduction along the eastern margin of Paleo-Asia","authors":"Yoshiaki Sugamori","doi":"10.1016/j.revmic.2024.100788","DOIUrl":"10.1016/j.revmic.2024.100788","url":null,"abstract":"<div><p>The Kamitaki Complex, situated in the Sasayama area in Southwest Japan, has long been presumed to be a Permian<span><span> subduction-related accretionary complex based on correlations from previous studies. However, because of the lack of fossil evidence, the exact age of the complex remained uncertain for a long time period. To address this gap in knowledge, a geological survey and </span>microfossil mapping were conducted in the Kamitaki Complex to determine its age and geological context.</span></p><p><span><span><span>A geological survey revealed that the Kamitaki Complex mainly consists of clastic rocks, and a mixture of sandstone, </span>basalt, and </span>chert<span><span><span> blocks within the mudstones. The Kamitaki Complex is tectonically intercalated into the </span>Lopingian (Late Permian) accretionary complex of the Ultra-Tamba </span>Terrane<span><span> and Late Triassic accretionary complex of the Tamba Terrane. The lithological and structural characteristics of the Kamitaki Complex confirm that it is an accretionary complex. Microfossil mapping yielded depositional ages, with </span>radiolarian fauna such as </span></span></span><em>Eptingium nakasekoi, Pseudostylosphaera japonica, Cryptostephanidium japonicum</em>, and <em>Oertlispongus</em> cf. <em>diacanthus</em><span> identified in mudstones suggesting an Anisian (early Middle Triassic) age. In contrast, radiolarian fauna found in cherts, including </span><em>Pseudoalbaillella</em>? aff. <em>longicornis</em>, and <em>Follicucullus</em> cf. <em>porrectus</em><span><span>, indicate an early Capitanian (late Guadalupian, middle Permian) depositional age. These findings suggest that the Kamitaki Complex records a trenchward migration of the oceanic plate in a </span>pelagic environment<span> from the early Capitanian and an accretion at the trench during the Anisian period.</span></span></p><p><span><span>Conventionally, the plate boundary between the Panthalassa and Paleo-Asia during the latest Permian to </span>Middle Triassic was of the transform type, primarily because no subduction-related accretionary complexes from this period have been identified in the Japanese Islands. However, the discovery of Kamitaki Complex, an Anisian accretionary complex, provides evidence of Middle Triassic subduction activity along the eastern margin of Paleo-Asia. According to the internal structure and age polarity of the Ultra-Tamba and Tamba terranes, an accretionary complex developed over a prolonged period (approximately 120 million years) in a </span>tectonic setting<span> that persisted along the eastern margin of Paleo-Asia from the late Guadalupian to the earliest Cretaceous period.</span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"84 ","pages":"Article 100788"},"PeriodicalIF":0.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiolarian occurrence and origin of basaltic rocks in the Hebiki Unit, Northern Chichibu accretionary complex in the Kanto Mountains, Central Japan","authors":"","doi":"10.1016/j.revmic.2024.100782","DOIUrl":"10.1016/j.revmic.2024.100782","url":null,"abstract":"<div><p><span>Reconstructing ocean plate stratigraphy (OPS) and revealing the places of origin and ages of oceanic rocks of the Jurassic–Early Cretaceous accretionary complex in Eastern Asia are important to clarify the accretion process and the paleogeography and </span>tectonic setting<span><span><span><span> of the Panthalassa Sea during the Paleozoic to Mesozoic times. In this context, many geological investigations of the Middle Jurassic–Early Cretaceous units of the Northern Chichibu accretionary complex (except for an Early Jurassic<span> one) and Mikabu Unit have been performed. In this study, geological mapping, faunal analysis of </span></span>radiolarians, and geochemical analysis of basaltic rocks were conducted for the Hebiki Unit of the Northern Chichibu accretionary complex to obtain prime geological information such as its stratigraphy, ages, and origin of basaltic rock. The Early Jurassic Hebiki Unit consists of chaotic mélange, which contains sandstone, siliceous shale, </span>chert, and basaltic rocks as blocks in a highly sheared shale matrix. Late </span>Permian<span><span><span> and Late Triassic radiolarians were newly identified from chert blocks in this study. Based on the radiolarian evidence from this study and previous ones that identified Jurassic radiolarians from siliceous shale, the OPS of the Hebiki Unit are reconstructed as follows: Upper Permian and Upper Triassic (upper </span>Carnian<span> to Rhaetian) chert, and Lower Jurassic (Pliensbachian) siliceous shale in ascending order. Meanwhile, the basaltic rocks of the Hebiki Unit are divided into two types in terms of the major and trace element composition and REE profiles: low and high Nb/Zr types. The low and high types are interpreted as oceanic island </span></span>basalt (OIB) and mid-ocean ridge basalt (MORB), respectively. Considering the reconstructed OPS of the four tectonostratigraphic units (Kashiwagi, Kamiyoshida, Sumaizuku, and Hebiki) of the Northern Chichibu accretionary complex, the four units are considered to have accreted successively.</span></span></p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"84 ","pages":"Article 100782"},"PeriodicalIF":0.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141140728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Radiolarian dating of cherts from the Artofago Cave: Insights into prehistoric lithic tool production and resource exploitation in Southern Tuscany, Italy","authors":"Dario Ferrari ,&nbsp;Marco Chiari ,&nbsp;Enrico Pandeli ,&nbsp;Luca Bachechi","doi":"10.1016/j.revmic.2024.100790","DOIUrl":"10.1016/j.revmic.2024.100790","url":null,"abstract":"<div><p>New perspectives in the archaeometric investigation of the chert used in lithic tool assemblages allow us to learn more about the socio−economic behavior of prehistoric human groups. The case study presented here is from the Artofago Cave in South Tuscany, Italy. Among other findings, an Upper Paleolithic lithic complex was excavated from a large fireplace near the entrance.</p><p><span>The purpose of this study is to gather data aimed at determining the raw material used in the production of these lithic tools, thereby enhancing research into its geographic source area. Here we highlight the significance of the geological age of the rock as one of key factors enabling us to formulate hypotheses about its geological provenance. It showcases a successful application of radiolarian </span>biostratigraphy<span> in dating cherts from the archaeological record. Specifically, 67 chert samples from the Upper Paleolithic lithic complex of the Artofago cave were treated with HF to isolate the radiolarian assemblages. The samples had been carefully chosen in advance between broken chert pieces (chert debris) in the waste material given that the analysis is partially destructive.</span></p><p>Chert samples can be assigned to a Middle − Late Jurassic<span> age, more specifically middle Callovian−early Oxfordian to late Kimmeridgian−early Tithonian (UAZ 8-11).</span></p><p>These ages are comparable with those of the Diaspri di Monte Alpe Formation of the Ligurian Vara Unit, the uppermost tectonic unit of the Northern Apennines.</p></div>","PeriodicalId":45442,"journal":{"name":"REVUE DE MICROPALEONTOLOGIE","volume":"84 ","pages":"Article 100790"},"PeriodicalIF":0.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}