Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
8
datasets available to search
ShareScore release 0.9.0
Dataset results
8 results for “Proterozoic”
Varied oxygen simulations with WACCM6 (Proterozoic to pre-industrial atmosphere)
<p>The history of molecular oxygen (O<sub>2</sub>) in Earth's atmosphere is still debated; however, geological evidence supports at least two major episodes where O<sub>2</sub> increased by an order of magnitude or more: the Great Oxidation Event (GOE) and the Neoproterozoic Oxidation Event. O<sub>2 </sub>concentrations have likely fluctuated (between 10<sup>−3</sup> and 1.5 times the present atmospheric level) since the GOE ∼ 2.4 Gyr ago, resulting in a time-varying ozone (O<sub>3</sub>) layer. Using a three-dimensional (3D) chemistry climate model, we simulate changes in O<sub>3</sub> in Earth's atmosphere since the GOE and consider the implications for surface habitability, and glaciation during the Mesoproterozoic. We find lower O<sub>3</sub> columns (reduced by up to 4.68 times for a given O<sub>2</sub> level) compared to previous work; hence, higher fluxes of biologically harmful UV radiation would have reached the surface. Reduced O<sub>3</sub> leads to enhanced tropospheric production of the hydroxyl radical (OH) which then substantially reduces the lifetime of methane (CH<sub>4</sub>). We show that a CH<sub>4</sub> supported greenhouse effect during the Mesoproterozoic is highly unlikely. The reduced O<sub>3</sub> columns we simulate have important implications for astrobiological and terrestrial habitability, demonstrating the relevance of 3D chemistry-climate simulations when assessing paleoclimates and the habitability of faraway worlds.</p>
Quantifying the global biodiversity of Proterozoic eukaryotes
Open the record for dataset details and reuse information.
Varied oxygen simulations with WACCM6 (Proterozoic to pre-industrial atmosphere)
Open the record for dataset details and reuse information.
Trace and rare-earth element composition of 2480 Ma detrital zircons in Proterozoic metapsammites from northwestern Arizona
<p>Detrital zircon grains in the ~1740-1750 Ma Vishnu Schist and similar rock units in northwestern Arizona consist of up to 30% grains dated by U-Pb isotopic analysis at 2470-2490 Ma. These zircon grains are distributed over ~40,000 km<sup>2 </sup>and define an age peak at 2480.0 ± 27.3 Ma (2SE). These grains have yielded unusually consistent <sup>207</sup>Pb/<sup>206</sup>Pb dates, with generally smaller analytical uncertainty and greater concordance to ideal U-Pb evolution than grains of other ages. A weighted mean age of 2480 ± 0.9 Ma (2SE) for this zircon population reflects consistent analytical results and high analytical precision but not the accuracy of the age. The source of these zircons has not been identified. To better characterize the unidentified source, we analyzed 45 of these grains for trace and rare-earth elements by laser-ablation mass spectrometry and scanned 16 grains with an electron microprobe to identify mineral inclusions. Mass spectrometer determinations of Sc/Yb and Nb/Sc support derivation from an oceanic-island igneous source. Electron microprobe scans revealed quartz in 5 of 16 grains, indicating a felsic source. The low variability in <sup>207</sup>Pb/<sup>206</sup>Pb dates and a generally linear relationship between U and Th support zircon derivation from a single igneous unit or closely related set of units without xenocrystic zircons. A literature search for other zircon populations with similar age and U/Th ratios identified ~2480 Ma zircons in a Mesoproterozoic(?) metapsammite and conglomerate in southwestern Montana. This sandstone was deposited near the margin of the Wyoming craton and contains almost entirely 2400-3600 Ma zircons, unlike zircon grains in Vishnu Schist which include a large population of 1730-1900 Ma zircons. From this relationship, we infer that the 2480 Ma zircons in both areas were derived from a source in the Wyoming craton. We conclude that the 2480 Ma Vishnu zircons were derived from a felsic batholith that formed above and from hotspot magma related to the ~2450-2480 Ma Matachewan Large Igneous Province, that this batholith formed by mixing between a mantle-derived hotspot magma and assimilated Archean continental crust, and that the source rock was emplaced during initial rifting between the Wyoming craton and the Superior province.</p>
Trace and rare-earth element composition of 2480 Ma detrital zircons in Proterozoic metapsammites from northwestern Arizona
Open the record for dataset details and reuse information.
Text-fig. 2. Stratigraphical section at Předboj (according to Žítt et al. (1999), modified). Legend: 1 – Proterozoic bedrock, 2 – conglomerate, 3 – marl, marlstone, Ph – phosphatic crusts, R – reworked deposit, C – Upper Cenomanian, T – Lower Turonian, Q – Quaternary deposits, c – occurrence of invertebrate coprolites. in Sabellid And Serpulid Worms (Polychaeta, Canalipalpata, Sabellida, Sabellidae, Serpulidae) From The Rocky Coast Facies (Late Cenomanian) At Předboj Near Prague
Text-fig. 2. Stratigraphical section at Předboj (according to Žítt et al. (1999), modified). Legend: 1 – Proterozoic bedrock, 2 – conglomerate, 3 – marl, marlstone, Ph – phosphatic crusts, R – reworked deposit, C – Upper Cenomanian, T – Lower Turonian, Q – Quaternary deposits, c – occurrence of invertebrate coprolites.
Text-fig. 1. Geological map of the site Kučlín, Trupelník Hill. 1 – dumpsite body, exploitation faces, 2 – landslide body, 3 – occurrence of the basalt in the landslide body, 4 – tuff, tuffite with gneiss particles, 5 – 11 – Late Eocene rocks. 5 – basalts, 6 – tuff, tufite, 7 – diatomaceous cherts layer enclosing lenses of diatomaceous earth, 8 – diatomitic breccia, 9 – diatomaceous shale, 10 – diatomaceous clays to diatomites, 11 – calcareous diatomaceous clays to diatomaceous limestones and re-deposited Cretaceous material, 12 – Late Turonian marlstone to limestone, 13 – Middle Turonian marlstone, 14 – Middle Turonian organo-detritic limestone to conglomerate, 15 – Late Proterozoic orthogneiss, 16 – Syčivka creek, 17 – road, field drives, 18 – Kučlín village. in Geology Of The Site Kučlín, Trupelník Hill Near Bílina In North Bohemia
Text-fig. 1. Geological map of the site Kučlín, Trupelník Hill. 1 – dumpsite body, exploitation faces, 2 – landslide body, 3 – occurrence of the basalt in the landslide body, 4 – tuff, tuffite with gneiss particles, 5 – 11 – Late Eocene rocks. 5 – basalts, 6 – tuff, tufite, 7 – diatomaceous cherts layer enclosing lenses of diatomaceous earth, 8 – diatomitic breccia, 9 – diatomaceous shale, 10 – diatomaceous clays to diatomites, 11 – calcareous diatomaceous clays to diatomaceous limestones and re-deposited Cretaceous material, 12 – Late Turonian marlstone to limestone, 13 – Middle Turonian marlstone, 14 – Middle Turonian organo-detritic limestone to conglomerate, 15 – Late Proterozoic orthogneiss, 16 – Syčivka creek, 17 – road, field drives, 18 – Kučlín village.
Data from: The Proterozoic record of eukaryotes
Open the record for dataset details and reuse information.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.