From 1 - 10 / 15
  • Categories  

    This website provides interactive access to geospatial isotope data for Great Britain. The site includes isotope data for strontium, oxygen and sulphur distributions across Great Britain. The user can input isotope measurements from a sample and the website will compare it with British data distributions and provide a downloadable map of areas that match the composition of the unknown. The project is rooted in archaeological studies but has applications in the modern world of food traceability.

  • Categories  

    Database of samples taken from the Norham Westmains Farm borehole for isotope, thin section, palynology and fossil analysis. Westmains Farm, Norham, Berwick-upon-Tweed NT 91589 48135. BGS borehole ID NT94NW20.

  • Categories  

    This file documents the sulphur isotope data, and the manner in which it has been processed, to supply the reference data for isotope domains of the Isotope biosphere domains GB (V1) map. It includes a summary of the analytical methods used to determine the isotope ratios though time.

  • Categories  

    This file documents the strontium isotope data, and the manner in which it has been processed, to supply the reference data for isotope domains of the Biosphere Isotope Domains GB (V1) map. It includes a summary of the analytical methods used to determine the isotope ratios though time.

  • Categories  

    Chemical analysis of pyroxenes and BSE-SEM images from pumices and lava flows from Popocatepetl Volcano, Mexico. Whole rock isotope data from pumices and lava flows from Popocatepetl Volcano, Mexico.

  • Categories  

    Our proposed research is based on cores collected during the recent, and very successful, Integrated Ocean Drilling Program (IODP) Expedition 340. The aims of this expedition were to investigate the volcanism and landslide history of the Lesser Antilles volcanic arc, by collecting a number of cores offshore Montserrat and Martinique. As a shipboard planktic foraminifera (single celled calcareous plankton) biostratigrapher (dating sediment cores using the appearances and disappearances of fossil plankton), Deborah Wall-Palmer (proposed PDRA) has access to these cores during the one year moratorium period. Until IODP Exp. 340, the longest continuous record (~250,000 years) of volcanic activity on Montserrat was a 5.75 m core collected to the south-west of the island in 2002, CAR-MON 2. This core revealed a more extensive and complete record of volcanic activity than that available in terrestrial cores. The longest continuous sediment record collected during Exp. 340 extends this record considerably. At 139.4 m in length, Hole U1396C records events back to 4.5 million years ago. The majority of this Hole will undergo stratigraphic analysis at low resolution, which will be carried out by other Exp. 340 scientists (Andrew Fraass, Mohammed Aljahdali). The upper 7 m section of this Hole is estimated to span 300,000 years and is comparable to the time period recovered in sediments for Holes U1394A/B (0 to 125 cm) and U1395B (0 to 30 cm). Holes U1394A/B and U1395B were collected close to Montserrat, in the main path of eruptive material from the Soufriere Hills volcano and contain a high resolution, but interrupted record of volcanic eruptions and landslides. Our proposed research is to provide a high resolution (every 2000 yrs) age framework across the upper ~300,000 year sections of these three cores. This will be achieved by collecting specimens of the planktic foraminifera Globigerinoides ruber and analysing the stable oxygen isotope ratios contained within their calcium carbonate tests (shells). Oxygen isotope ratios provide information about the global ice volume and global climate, and the standard record can be identified world-wide. Correlation to this record can therefore be used to provide an age framework for sediments, which is more detailed than using the biostratigraphic range of species alone. Producing this age framework is essential for achieving the overall aims of Exp. 340 as it will be used, in collaboration with several other Exp. 340 scientists, to reconstruct the volcanic and landslide history of Montserrat. In addition to this, to ensure the conservative use of samples, some further work will be carried out on samples requested from the upper 7 m of Hole U1396C. This will assist in constructing the low resolution stable isotope and biostratigraphic framework for the remainder of this Hole. The majority of this work is being carried out by Andrew Fraass (University of Massachusetts) and Mohammed Aljahdali (Florida State University). We will analyse the upper 7 m of Hole U1396C, at low resolution, for stable oxygen isotopes of the benthic foraminifera Cibicidoides spp. and for planktic foraminifera datum species.

  • Categories  

    Isotope analysis data. Project details: The continental crust is our only archive of Earth history; not just of the crust itself but of the hydrosphere, atmosphere and biosphere, and of the deep Earth through its interactions with the crust. This archive, like the rock record itself, is incomplete and much effort is focused on interrogating the crust to gain a clearer and more complete picture of Earth history. The continental rock record is episodic with, for example, ages of igneous crystallization, metamorphism, continental margins, and seawater and atmospheric proxies distributed about a series of peaks and troughs that in part correspond with the cycle of supercontinent assembly and dispersal. At the core of the debate is what these well-established peaks of ages in the geological record represent and how they develop. The peaks of ages correspond with periods of global assembly of continents to form supercontinents. The project will address whether the peaks of ages are primary features associated with supercontinent assembly or break up, or they are they secondary features representing greater preservation potential at the times of supercontinent assembly. Our work will focus on the Rodinian supercontinent cycle, which extends from initiation of convergent plate interaction around 1.7 Ga, to continental collision at 1.1-1.0 Ga during the Grenville orogeny, to final breakup of the supercontinent by 0.54 Ga. Detrital zircons from sedimentary units throughout the supercontinent cycle provide a record of the magmatic activity for which the igneous rocks are often no longer preserved. We will determine (i) the ages ranges of magmatic activity preserved in the sedimentary rocks in the 600 Ma pre-collision phase, and (ii) how and when the distinctive Grenville peak of ages developed by comparing the zircon record from samples pre-, syn- and post- Rodinian supercontinent assembly with estimated volumes of magma and numbers of zircons produced during the same interval. This will differentiate primary generation processes from secondary processes, constraining when the dominant age peak developed, the tectonic processes that operated, and hence the method by which it developed. The wider implications of when the continental crust formed are considerable. Studies of continental growth continue to uncritically assume that the geological and isotopic record provide insight into processes of crust formation. Until it can be established whether the record is the outcome of generational or preservational processes, or a combination of both, then drawing conclusions on this fundamental question in the Earth Sciences are premature. If the record is a preservational record then this impacts on understanding continental growth through time and on secondary questions of how the crustal record is used to unravel the temporal evolution of the hydrosphere and biosphere, and the distribution of mineral deposits.

  • Categories  

    This is a geochemical dataset accompanying Emmings, J., Poulton, S., Vane, C., Davies, S., Jenkin, G., Stephenson, M., Leng, M., Lamb, A., Moss-Hayes, V. A Mississippian Black Shale Record of Redox Oscillation. Palaeogeography, Palaeoclimatology, Palaeoecology [submitted July 2019]. This dataset includes RockEval pyrolysis, major and trace element (XRF), Fe speciation, C, N and S isotopes and S species analyses through the Upper Bowland Shale in the Craven Basin (Lancashire, UK). This research was conducted by Joe Emmings, PhD researcher at the University of Leicester and British Geological Survey (BGS) between 2014-2018, and as a post-doctoral research associate (PDRA) at the British Geological Survey (2018-2021). The PhD research was funded by the Natural Environment Research Council (NERC), as part of the Central England Training Alliance (CENTA) [grant no. NE/L002493/1] and received CASE funding from the BGS. PDRA research was funded by the British Geological Survey. Reproduction or manipulation of these data in future analyses should cite one or more of the following related publications (as necessary): Emmings, J., 2018. Controls on UK Lower Namurian Shale Gas Prospectivity: Understanding the Spatial and Temporal Distribution of Organic Matter in Siliciclastic Mudstones. PhD Thesis, University of Leicester. Emmings J. et al. 2017. Stream and slope weathering effects on organic-rich mudstone geochemistry and implications for hydrocarbon source rock assessment: a Bowland Shale case study. Chemical Geology. 471. 74-91. Emmings, J. et al., 2019a. From Marine Bands to Hybrid Flows: Sedimentology of a Mississippian Black Shale. Sedimentology, [Accepted ms.]. Emmings, J.F. et al., 2019b. Controls on amorphous organic matter type and sulphurization in a Mississippian black shale. Review of Palaeobotany and Palynology, 268: 1-18. Emmings, J.F. et al. A Mississippian black shale record of redox oscillation. Palaeogeography, Palaeoclimatology, Palaeoecology [submitted July 2019] Co-workers: Sarah Davies (University of Leicester) - Primary PhD supervisor, sedimentology Chris Vane (BGS) - PhD supervisor, RockEval pyrolysis Mel Leng (BGS & University of Nottingham) - PhD supervisor, C & S isotopes Mike Stephenson (BGS) - PhD supervisor Simon Poulton (University of Leeds) - Fe speciation Gawen Jenkin (University of Leicester) - PhD supervisor Vicky Moss-Hayes (BGS) - RockEval pyrolysis Angela Lamb (BGS) - S isotopes

  • Categories  

    Clumped isotope analyses, raw data, replicates and temperatures calculated using the empirical calibration of Wacker et al. (2014), recalculated using the [Brand] isotopic parameters.

  • Categories  

    The dataset consists of a spreadsheet containing whole rock geochemistry (Major and trace elements, Hf isotopes) from 7 samples and zircon U-Pb, O, Hf isotope and trace elements compositions (>200 spots on zircons from 7 samples) analysed by Ion Microprobe (NERC EIMF) and MC-LA-ICP-MS (NIGL). The samples are Eoarchaean amphibolite-facies mafic gneisses and a pegmatite as well as granulite-facies mafic gneiss and migmatite (melano- and leucosome) from the Kapuskasing uplift in Ontario, Canada.