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24 results for “Neoproterozoic”
Plate model for 'Extending Full-Plate Tectonic Models into Deep Time: Linking the Neoproterozoic and the Phanerozoic '
<p>Plate model for the last 1 Ga accompanying Merdith et al. (2021), Earth Science Reviews.</p> <p>-changes</p> <p>Correction to animation file.</p>
Delimiting the Neoproterozoic São Francisco Paleocontinental Block with P-wave travel-time tomography
<p>Tomographic data set for different depths (CSV-files with Longitude, Latitude anda Velocity Perturbation in percentage), Interpreted limit of the São Francisco Paleocontinent and the Abstract for the paper "Delimiting the Neoproterozoic São Francisco paleocontinental block with P-wave travel-time tomography" accepted by Geophysical Journal International.</p>
Fig. 4 in Silicified and phosphatized Tianzhushania, spheroidal microfossils of possible animal origin from the Neoproterozoic of South China
Fig. 4. Tianzhushania in thin−section of phosphorites from the Weng'an area. A. Tianzhushania ornata (Xiao and Knoll, 2000) comb. nov., MESIG 10008 (42.1/98.2), cross−section view of specimen lacking the surrounding multilamellar outer covering (arrow in A1 shows position of A2); A2, close−up of A1, showing contour of prominences. B. Tianzhushania sp., MESIG 10008 (59.7/96.2), cross−section view of surface tubercles. C. Tianzhushania sp., MESIG 10007 (19.1/84.3), equatorial view of the tubercular wall.
Fig. 7 in Silicified and phosphatized Tianzhushania, spheroidal microfossils of possible animal origin from the Neoproterozoic of South China
Fig. 7. Phosphatized globular fossils from Doushantuo phosphorites in the Weng'an area. A. MESIG 21070, Tianzhushania ornata (Xiao and Knoll, 2000) comb. nov. with enclosed smooth internal body. B–J. Parapandorina raphospissa Xue et al. 1995. B. MESIG 20296, two−cell stage. C. MESIG 21027, four−cell stage. D. MESIG 20304. E. MESIG 21031. F. MESIG 21033, eight−cell stage. G. MESIG 21037. H. MESIG 20252. I. MESIG 20258. J. MESIG 21129, possible later stages. K, L. Globular fossils with smooth envelope. K. MESIG 20211. L. MESIG 21122.
Fig. 3. A in Silicified and phosphatized Tianzhushania, spheroidal microfossils of possible animal origin from the Neoproterozoic of South China
Fig. 3. A. Tianzhushania sp. with possible two−cell stage cleavage from thin sections of chert in the Weng'an area, MESIG 10003 (44/89.6); A1, general view, showing the wall and internal structures; note that the internal body is cleaved into two; arrow shows position of A2; A2, enlarged view of A1, showing details of the structure of the envelope. B. Typical Tianzhushania spinosa Yin and Li, 1978, found in a chert nodule from eastern Yangtze Gorges, MESIG 10006 (40.1/94.2); B1, general view, for comparison with the specimen (Fig. 2A) found in the Weng'an area (arrow shows position of B2); B2, enlarged view of B1, showing details of the structure of the wall (arrow points to external membrane between two bundles of processes).
Fig. 6 in Silicified and phosphatized Tianzhushania, spheroidal microfossils of possible animal origin from the Neoproterozoic of South China
Fig. 6. Phosphatized Tianzhushania ornata (Xiao and Knoll, 2000) comb. nov. in Doushantuo phosphorites at Weng'an. A. MESIG 21042; A2, detail of A1, showing a part of outer covering surrounding the envelope with tubercles. B. MESIG 21045, specimen preserving part of outer covering. C. MESIG 21064; note the internal membrane. D. MESIG 20303, showing shrunken internal body with membrane and secondary overgrowth on internal body. E. MESIG 20190, polygons with fractal branching; note numerous dimples at top. F. MESIG 21076; F2, detail of F1, showing details of irregularly distributed dimples. G. MESIG 21078, polygonal envelope ornamentation; note that dimples also occur on arches. H. MESIG 21009; H2, detail of H1, showing deflated envelope and details of envelope ornamentation. I. MESIG 21026, deflated envelope with envelope ornamentation.
Fig. 3 in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 3. SEM images of late Ediacaran Cloudina. A, C–E. Cloudina ex gr. C. riemkeae Germs, 1972; Kyyry−Ytyga (1.6 km downstream from Ulakhan−Ytyga Creek mouth), Yudoma River, right bank, Siberian Platform, Russia, Ust'−Yudoma Formation. A. SNIIGGiMS 1630/1, tube fragment with abraded shell wall. C. SNIIGGiMS 1630/2, fragment of tube with holes formed after microdolomite crystal dissolution. D. SNIIGGiMS 1630/3, detail of tube fragment with holes formed after microdolomite crystal dissolution. E. SNIIGGiMS 1630/4, tube nested funnels. B, F–H. Cloudina ex gr. C. hartmanae Germs, 1972; Tirteafuera River, Abenójar Anticline, East Lusitanian–Alcudian Zone, central Spain, lower La Grajera−Cañuelo unit, Ibor Group. B. MPZ 2007/3918, abraded tube fragment with imprints of mica crystals of the matrix. F. MPZ 2007/3919; F1, tube fragment with wall preserved; F2, detail of F1; F3, detail of F1, wall microstructure. G. MPZ 2007/3920, abraded tube fragment. H. MPZ 2007/3921; H1, tube fragment with wall preserved; H2, detail of H1 showing wall microstructure. Scale bars A, D, E, H1 100 µm; B, C, F2 300 µm; F1, G 1 mm; F3 50 µm; H2 30 µm.
Fig. 6 in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 6. Microstructure of late Ediacaran and early Cambrian microfossils. A. Namacalathus hermanastes Grotzinger, Watters, and Knoll, 2000, Kuibis Subgroup, Nama Group, Upper Ediacaran, Zaris Subbasin, Namibia; MNHN Ca 370−1; A1, cross−section of stem; A2, detail of A1 showing blade−like elongate parallel crystals (laths) of calcite. B. Cribricyath Szecyathus cylindrucus Vologdin, 1957, Usa Formation, Botoman Stage, Lower Cambrian, Batenevskiy Range, Altay Sayan Foldbelt, Russia; MNHN Ca 194; B1, detail of skeleton outer wall; B2, detail of B1 (rectangle) showing microgranular microstructure. C. Cloudina hartmanae Germs, 1972, Birba Formation, Ara Group, Upper Ediacaran, Oman; MNHN Ca 361; C1, oblique longitudinal section; C2, detail of C1; C3, oblique longitudinal ultrathin section, crossed nicols. D. Cloudina hartmanae Germs, 1972, Birba Formation, Ara Group, Upper Ediacaran, Oman; MNHN Ca 360; D1, longitudinal section showing two primary skeletal layers; D2, detail of D1 showing secondary elongated crystals initiated at primary layer surface; D3, longitudinal ultrathin section showing several primary layers, crossed nicols; D4, detail of D3, transmitted light; D5, detail of D4, crossed nicols. Scale bars A1, B1, C1, D3 1 mm; A2, B2, C2, D1, D4 100 µm; C3, D2, D5 10 µm.
Fig. 2 in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 2. Stratigraphic distribution of Ediacaran skeletal fossil assemblages from around the world. A. Zaris (Kuibis Subgroup) and Witputs (Schwarzrand Subgroup) subbasins, Nama Basin, Namibia (Grotzinger et al. 1995, 2000, 2005; Saylor et al. 1998; Wood et al. 2002). B. Yangtze Platform, southern Shaanxi, China (Hua et al. 2000b; Steiner et al. 2007; Zhu et al. 2007: lower C isotope curve; Ishikawa et al. 2008: upper C isotope curve; Pb/U radiometric data after Condon et al. 2005; Compston et al. 2008; Zhu et al. 2009). C. Abenójar (Abenójar Village and Tirteafuera River) Anticline, East Lusitanian–Alcudian Zone, central Spain (Ortega Girones and Sánchez Vizcaíno 1987). D. Yudoma River, Uchur−Maya region, Siberian Platform, Russia (C isotope data after Brasier et al. 1994; Podkovyrov and Davydov 1998; Pb−Pb radiometric data after Semikhatov et al. 2003). E. South Oman Salt Basin (Brasier et al. 2000; Amthor et al. 2003; Schröder and Grotzinger 2007). Abbreviations: Dolom., dolomite; Fm., formation; Gr., group; Mb., member.
Fig. 5 in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 5. Late Ediacaran Sinotubulites sp. MPZ 2007/3922; Tirteafuera River, Abenójar Anticline, East Lusitanian–Alcudian Zone, central Spain; Ibor Group. A. Tube inner mold fragment with a longitudinal crack. B. Detail of A. Scale bars A 200 µm; B 100 µm. Both SEM images.
Fig. 4 in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 4. Late Ediacaran calcareous fabrics from Ibor Group, Abenójar Anticline, East Lusitanian–Alcudian Zone, central Spain. A, B. Cloudina ex gr. C. hartmanae Germs, 1972, lower La Grajera−Cañuelo unit, Tirteafuera River. A. MPZ 2007/3923, longitudinal section showing wall fragments or bacterial microburrowing within skeleton ̕arrow). B. MPZ 2007/1465, oblique longitudinal section. C. MPZ 2009/496, longitudinal section of corolla−bearing "Cloudina" carinata Cortijo, Martí Mus, Jensen, and Palacios, 2010, lower La Grajera−Cañuelo unit, Tirteafuera River. D. MPZ 2007/3925, thrombolite structure, breccia unit "calizas de Abenójar", Abenójar. Scale bars 250 µm.
Fig. 1. Maps indicating studied localities. A in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 1. Maps indicating studied localities. A. Map of Uchur−Maya region showing reference sections of the Yudoma River: 1, Nuuchchalakh; 2, Kyyry−Ytyga; 3, Ust'−Yudoma (Suvorovella and Majaella locality). Inset map indicates location within Siberian Platform. B. Pre−Hercynian outcrops and tectonostratigraphic zones of Iberian Peninsula. Valdelacasa, Ibor, Navalpino, and Abenójar anticlines are outlined. Zones: CZ, Cantabrian; ELAZ, East Lusitanian–Alcudian; GCZ, Galician–Castilian; OMZ, Ossa−Morena; SPZ South Portuguese; WALZ, West Asturian−Leonese.
Fig. 7 in New finds of skeletal fossils in the terminal Neoproterozoic of the Siberian Platform and Spain
Fig. 7. Global reconstruction of late Ediacaran continental positions, simplified from Smith (2001), and indicating areas where carbonate deposits and principal skeletal fossil assemblages occur (symbols). 1, Kuibis and Schwarzrand subgroups, Namibia; 2, La Ciénega Formation, Sonora, Mexico; 3, upper Reed Dolomite and lower Deep Spring Formation, California and Nevada, USA; 4, Byng Formation, British Columbia, Canada; 5, Ust'−Yudoma Formation, Yakutia, Russia; 6, Zabit and Ungut formations, Eastern Sayan; Belka and Karchit formations, Mountain Shoria; Tarzhul Formation, Kuznetsky Alatau, Altay Sayan Foldbelt; Kotodzha and Raiga formations, West Siberian Plate, Russia; 7, Río Huso and Ibor groups, Castilla−La Mancha, Spain; 8, Birba Formation, Oman; 9, Beiwan and Baimatuo members, Dengying Formation, Hubei and Shaanxi, China; 10, Tamengo Formation, Corumbá Group, Mato Grosso do Sul, Brazil; 11, Yerbal Formation, Arroyo del Soldado Group, Uruguay.
Extending full-plate tectonic models into deep time: Linking the Neoproterozoic and the Phanerozoic
<p>This file describes the plate model accompanying Merdith et al. (in review), 'A continuous, kinematic full-plate motion model from 1 Ga to present'. It is a compilation of four plate models: Domeier (2016; 2018); Merdith et al. (2017); Young et al. (2019) and presented purely in a palaeomagnetic reference frame derived from Tetley (2018).</p> <p>This directory contains <strong>Merdith_etal_2021_ESR_v1.2.4.gproj</strong>, which is a GPlates project file that will load the following:</p> <p><strong>1000_0_rotfile_Merdith_etal.rot</strong> - the Global Rotation Model but with a purely paleomagnetic reference frame</p> <p><strong>1000_410-*{Convergence/Divergence/Transform/Topologies}-Merdith_etal.gpml</strong> - the plate topologies for 1000 to 410 Ma</p> <p><strong>410-250_plate_bounds_Merdith_etal.gpml</strong> - the plate topologies for 410 to 250 Ma</p> <p><strong>250-0_plate_bounds_Merdith_etal.gpml</strong> - the plate topologies for 250 to 0 Ma</p> <p><strong>TopologyBuildingBlocks_Merdith_etal.gpml</strong> - building blocks for some topologies between 410 and 0 Ma</p> <p><strong>coastlines_Merdith_etal.gpml</strong> - a Global Coastline file (mainly for the past 400 Ma)</p> <p><strong>continents_Merdith_etal.gpml </strong>- a Global Continent shapes file (for the past 1 Ga)</p> <p><strong>cratons_Merdith_etal.gpml</strong> - a Global cratonic shapes file (for the past 1 Ga)</p> <p><strong>static_polygons_Merdith_etal.gpml</strong> - a Global static polygon file (for the past 1 Ga)</p> <p><strong>1000-410_poles.gpml </strong>- collection of palaeomagnetic data used to constrain the model between 1000 and 410 Ma (corresponds to Table 1 in the associated publication)</p> <p>For the Mesozoic and Cenozoic, the plates comprising the Pacific Ocean traditionally move in a separate reference to the other ocean basins and continental motions, instead defined by hotspot motion. In order to preserve the plate motion of the Pacific relative to the continental domains where the new GAPWAP was implemented, we extracted relative plate rotations between the Pacific (plateID: 901) and Africa (plateID: 701) in 5 Ma intervals between 250 and 83 Ma from the Young et al. (2019) model, which has been corrected for errata as discussed in Torsvik et al. (2019). This results in the same relative motion of all Pacific plates to continental plates; however it slightly alters the absolute position of the Pacific plates between 250 and 83 Ma. Studies interested in short(er) timescale (< 5 Ma) analysis or absolute plate motions should use a different model that explicitly links plate motion with the mantle (e.g. (Muller et al. 2019; Tetley et al. 2019)). To be clear, if you want to analyse the Pacific Ocean, including hotspot motion, Hawaiian-Emperor Bend kinematics etc. you should not use this model.</p> <p>To load these datasets in GPlates do the following:</p> <p>1. Open GPlates</p> <p>2. Pull down the GPlates File menu and select Open Project</p> <p>3. Click to select the GPROJ file</p> <p>4. Click Open</p> <p>Alternatively, drag and drop the GPROJ file onto the globe.</p> <p>You now have a global present day continents loaded in GPlates as well as the underlying rotation model and evolving plate topologies. Play around with the GPlates buttons to make an animation, select features, draw features, etc. For more information, read the GPlates manual which can be downloaded from <a href="https://www.gplates.org">www.gplates.org.</a> </p> <p>The agegrids associated with this model were subsquently developed as part of the <a href="../records/10910449" target="_blank" rel="noopener">Muller et al. 2022</a> model and can be accessed at: <a href="https://repo.gplates.org/webdav/PlateModel_Age_SR_Grids/Muller_etal_2022_SE/" target="_blank" rel="noopener">https://repo.gplates.org/webdav/PlateModel_Age_SR_Grids/Muller_etal_2022_SE/</a>.</p> <p><br> </p>
First identification of the Ediacaran Yukengou Formation in western Kuruktag, northeastern Tarim and its implications for the Neoproterozoic rift basin evolution
<p>This supporting information provides three supplemental tables containing the sandstone composition counting and zircon U-Pb dating results.</p>
Data from: Insights into VSM diversity and Neoproterozoic biostratigraphy in the light of recent Brazilian discoveries
Vase-shaped microfossils occur in dolostone clasts within conglomerates, breccias and diamictites of the Neoproterozoic Urucum Formation, Jacadigo Group, SW Brazil. Although their taphonomic history is distinct from those of other VSM assemblages, morphometric comparison of Urucum fossils with five others described previously from North America and Europe show that two of the Urucum species --- the long-necked Limeta lageniformis Morais, Fairchild and Lahr, 2017 and the funnel-necked Palaeoamphora urucumense Morais et al., 2017 occur in the Kwagunt and Callison Lake assemblages, as does Pakupaku kabin Riedman, Porter and Calver, 2017 recently described from the Togari Group, Tasmania. Obelix rootsii Cohen, Irvine and Strauss, 2017a (new combination), previously known only from the Callison Lake Formation, is documented here from the Kwagunt Formation. In addition, Trigonocyrillium horodyskii (Bloeser, 1985) and Bonniea dacruchares Porter, Meisterfeld and Knoll 2003, first described from the Kwagunt assemblage, have now been found in the Urucum Formation. In light of this survey, 16 of the 18 validly described VSM species are now known to occur in the Kwagunt Formation and 13 in the Callison Lake Formation, with 12 of them shared by both formations. The fact that the Urucum VSM assemblage exhibits six of seven species in common with the Kwagunt Formation --- L. lageniformis, P. urucumense, Cycliocyrillium simplex Porter et al., 2003, C. torquata Porter et al., 2003, B. dacruchares Porter et al., 2003, and T. horodyskii (Bloeser, 1985) --- and all but the last of these in common with the Callison Lake Formation supports correlation of these three assemblages and indicates that the source of the fossiliferous clasts within the Urucum Formation may well have been a now vanished late Tonian carbonate platform
New paleomagnetic insights into the Neoproterozoic connection between South China and India and their position in Rodinia
<p>These documents are supplementary tables for a manuscript submitted to Geophysical Research Letters entitled "New paleomagnetic insights into the Neoproterozoic connection between South China and India and their position in Rodinia" by Chang et al.</p>
Supplementary data for Provenance Analysis of Early Neoproterozoic Metasedimentary Rocks in Western Central Tianshan Block and Paleogeographical Reconstruction
<p>Supplementary data for Provenance Analysis of Early Neoproterozoic Metasedimentary Rocks in Western Central Tianshan Block and Paleogeographical Reconstruction.</p>
Supporting dataset for "Magnetotelluric images of Paleoproterozoic accretion and Mesoproterozoic to Neoproterozoic reworking processes in the northern Sao Francisco Craton, central-eastern Brazil"
<p>This dataset presents .edi files from 38 magnetotelluric stations across the northern São Francisco Craton in central-eastern Brazil. Data collection was financially supported by CNPq Project 573713/2008-1.</p>
Data from: Organic-walled microfossils of the mid-Neoproterozoic Alinya Formation, Officer Basin, Australia
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