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A digital geochronological index to act as a domain constraint for geochronology columns in corporate data tables. It decodes geochronology codes, models pseudo parent-child relationships between intervals (for example, find the epochs within a given period), allows range searches (for example, find the epochs between lower limiting and upper limiting epochs) and provides radiometric ages with ranges of uncertainty. Follows the recommendations of the BGS Stratigraphy Committee. Phanerozoic after Gradstein and Ogg (1996), with the Ordovician scheme of Fortey et al. (1995); Proterozoic after Cowie and Bassett (1989); Archaean after an unpublished decision of the Precambrian Subcommission of the IUGS. Covers the whole of geological time. Geochronological resolution usually to age level. Lower resolution in the Archaean, Proterozoic, Cambrian. Greater resolution in the Caradoc Epoch.
Macrostrat.org is a live database project collecting geochemical, geospatial, and geochronological data associated with specific rock units within stratigraphic columns with a geographic footprint. The data in Macrostrat is an aggregate of previously reported measurements in the literature. The database is constantly updated, expanded, and improved. Hence, data are archived (5-2-23) in this file for posterity in support of the manuscript titled "Evolution of the crustal phosphorus reservoir" (Walton et al., 2023). In all measurements in the data file: ages are in millions of years (Ma) and elemental compositions are in wt%. Further details of all definitions and standards in Macrostrat data reporting are permanently available at https://macrostrat.org/api/defs. Macrostrat data are useful for weighting geochemical data by the relative areal and volume abundance of the rock units from which they derive, helping to address questions of (over/under) sampling-induced bias. Data in these files represent direct exports from Macrostrat.org via the API root, supplemented with data from Reinhard et al (2017). Unit areal extents for data from Reinhard et al 2017) are approximated with the relevant Eon average from Macrostrat.org. Macrostrat.org is maintained by Shanan Dr Peters, Dr Daven Quinn, and the hard work of many others (https://macrostrat.org/#people).
This dataset comprises a series of six .xls workbooks which contain the data auxiliary material for the manuscript "Metrology and Traceability of U-Pb Isotope Dilution Geochronology (EARTHTIME Tracer Calibration Part I)" by Daniel Condon, Blair Schoene, Noah McLean, Samuel Bowring and Randall Parrish, submitted to Geochimica et Cosmochimica Acta (June 2014). These data comprise the input measurement data for the EARTHTIME U-Pb Tracer Calibration experiment, the results of which are documented in the manuscript mentioned above. This data set contains isotope ratio data for the manuscript listed above. ts01.xls Amelin and Davis (2006) Pb reference material isotope ratio data ts02.xls CRM 115 U isotope ratio data ts03.xls Gravimetric-Tracer mixture isotope ratio data ts04.xls GDMS elemental concentration data ts05.xls Tracer-blank Pb isotope ratio data ts06.xls U critical mixture isotope ratio data. Link to Published Paper - Metrology and Traceability of U-Pb Isotope Dilution Geochronology (EARTHTIME Tracer Calibration Part I) http://dx.doi.org/10.1016/j.gca.2015.05.026
The concentration of both L and D amino acid isomers was determined by HPLC (High-performance liquid chromatography) for multiple amino acids. 30 samples of proboscidean enamel were taken from the collections at BGS. Samples of enamel (~30 mg) was removed from the teeth of proboscideans using a small electric drill. All of the samples were from UK sites dating to the Quaternary. These samples were used to build a regional geochronology based on the extent of racemisation of amino acids from the intra-crystalline fraction (Dickinson, 2018). Thesis http://etheses.whiterose.ac.uk/22261. A published paper 'A new method for enamel amino acid racemization dating: A closed system approach' is also available; https://doi.org/10.1016/j.quageo.2018.11.005
This dataset comprises 40Ar/39Ar dated detrital hornblende grains for 5 samples from IODP Expedition 374 Site U1521 to the Ross Sea, collected on the RV JOIDES Resolution. Shipboard biostratigraphy and magnetostratigraphy suggests the samples are early Miocene in age (McKay et al., 2019, Proceedings of the International Ocean Discovery Program). These data can be compared to terrestrial geochronological data, allowing the changing provenance of the sediments to be traced.
The dataset contains detrital zircon U-Pb ages from a large scale detrital provenance study of modern and recent sand and silt from the Chinese Loess Plateau (CLP) and its proposed sources in the Yellow River, its Tibetan headwaters, and the Taklamakan Desert, which lies upwind from the CLP. (NERC grant NE/I009248/1)
Samples of high-grade amphibolite-facies gneiss collected from north west Bhutan. Data comprises samples mineral chemistry data, U-Pb rutile data and garnet trace element compositions.
The data are associated with a paper entitled 'Widespread tephra dispersal and ignimbrite emplacement from a subglacial volcano (Torfajökull, Iceland)' by J Moles et al. (2019). See paper for full details. Data types: major element geochemistry; trace element geochemistry; 40Ar/39Ar geochronology. Table DR9 contains EPMA data of proximal lavas and ignimbrite fiamme. Table DR10 contains EPMA data of ash shards. Table DR11 contains EPMA standard data. Table DR12 contains LA-ICP-MS data of proximal lavas and ignimbrite fiamme. Table DR13 contains LA-ICP-MS data of ash shards. Table DR14 contains LA-ICP-MS standard data (raw). Table DR15 contains LA-ICP-MS standard data (corrected). Table DR16 contains 40Ar/39Ar geochronology data.
This dataset comprises zircon U-Pb data on 11 samples, each containing ~90-150 individual grains. This method was applied to sediment samples from IODP Expedition 374 Site U1521 to the Ross Sea, collected on the RV JOIDES Resolution. Shipboard biostratigraphy and magnetostratigraphy suggests the samples are mainly early Miocene in age (McKay et al., 2019). The uppermost samples do, however, include younger Plio-Pleistocene sediments. Samples were measured using an Agilent 7900 laser ablation inductively-coupled plasma mass spectrometer (LA-ICP-MS) with a 25-35 µm pit diameter in the London Geochronology Centre at University College London.
Petrographic, whole-rock, quartz and zircon geochemistry, zircon Lu-Hf isotopes, molybdenite Re-Os geochronology and zircon U-Pb CA-ID-TIMS data from the Yerington Batholith, Nevada, USA. This data set comprises 10 .xlsx files collected during 2017-2022, as summarised below. They are each numbered as per their place as Supplementary Data within L. C. Carter’s PhD thesis “Exsolution depth and migration pathways of mineralising fluids in porphyry deposit-forming magmatic systems” (Camborne School of Mines, University of Exeter). 3.1_QEMSCAN data – QEMSCAN automated mineralogical assessment of a thin section made from drill core from the Ann Mason porphyry deposit, containing quartz unidirectional solidification textures (USTs) interlaid with aplite, hosted within an aplite dyke that cross-cuts a porphyry dyke. Analysed at Camborne School of Mines. 3.2 EPMA data – trace elements (Ti, Fe, Al) of quartz USTs, measured by EPMA spot analysis at Camborne School of Mines. 4.1 EPMA and IBA analyses – trace elements of quartz in miarolitic cavities and aplite dykes, measured by EPMA spot analysis at Camborne School of Mines and Total-IBA at UKNIBC, University of Surrey. Also includes Total-IBA map of titanium in quartz in a miarolitic cavity hosted in an aplite dyke. 4.2 QEMCAN data - QEMSCAN automated mineralogical assessment of a thin section of a mineralised miarolitic cavity hosted within an aplite dyke which cross-cuts the Luhr Hill granite. Analysed at Camborne School of Mines. 5.1 Full sample list – Full sample list for the following data sets. 5.2 Geochronology data – Zircon U-Pb CA-ID-TIMS geochronology data from across the Yerington batholith, analysed at NIGL, BGS. Molybdenite Re-Os geochronology data from the Ann Mason porphyry deposit, analysed at Durham University. 5.3 QEMCAN data - QEMSCAN automated mineralogical assessments of thin sections of a miarolitic cavities hosted within aplite dykes. Analysed at Camborne School of Mines. 5.4 Whole rock geochem data – Whole rock major (XRF) and trace element (ICP-MS) geochemistry data, analysed at University of Leicester. 5.5 Zircon LA-ICP-MS data – analysed at Natural History Museum, London 5.6 Zircon Lu-Hf isotope data – analysed at NIGL, BGS. Together, these files form the supplementary data files for L.C. Carter’s PhD thesis “Exsolution depth and migration pathways of mineralising fluids in porphyry deposit-forming magmatic systems” (Camborne School of Mines, University of Exeter). Please refer to the thesis for further details. These data are previously published as Carter et al. (2021, Communications Earth & Environment), Carter and Williamson (2022, Ore Geology Reviews) and Carter et al. (2022, Scientific Reports).