de.pangaea.dataset858460 und dataset PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact 2026-04-30T23:13:52Z https://doi.pangaea.de/10.1594/PANGAEA.858460 <gco:CharacterString>Field observation of fossil manganese nodules and crusts in the the West Sicilian Jurassic limestone beds</gco:CharacterString> 1970-01-01 publication https://doi.org/10.1594/PANGAEA.858460 Jenkyns, Hugh C
hughj@earth.ox.ac.uk
https://orcid.org/0000-0002-2728-0984 information author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital Supplement to: Jenkyns, Hugh C (1970): Fossil managese nodules from the West Sicilian Jurassic. Eclogae Geologicae Helvetiae, 63(2), 741-774, https://doi.org/10.5169/seals-163867 Fossil ferromanganese crusts, nodules and pavements are contained in stratigraphically condensed pelagic limestones from the Middle Jurassic of western Sicily; and a similar association of iron-manganese deposits with condensed pelagic sequences is notable throughout the Tethyan region. The west Sicilian concretions contain goethite, haematite and todokorite as fine-grained phases; their internal structure consists of iron-manganese segregations in a calcite matrix. Electron-microprobe study indicates that the amount of iron and manganese varies considerably in nodules from different localities, notwithstanding the disparity in carbonate content; and the same is true of the minor elements. The most consistently established inter-element relationships are Ni, Ba with Mn, and Ti with Fe - but these associations are by no means invariably developed. For western Sicily, submarine volcanism seems to have been the most immediate source of supply for the formation of the concretions; and this may well have been the case elsewhere in the Alpine- Mediterranean region; however, the Jurassic was a time of widespread sedimentary iron-ore formation in epicontinental northern Europe, and river drainage must have also supplied some manganese to the Tethyan Ocean. These mineral concretions are interpreted as being formed on ancient limestone (non-volcanic) seamounts. The presence of algal stromatolites in many of the condensed sequences suggests formation within the photic zone; and this relatively shallow-water origin may have affected the minor-element composition of the concretions, particularly with reference to copper and vanadium. completed Jenkyns, Hugh C
hughj@earth.ox.ac.uk
https://orcid.org/0000-0002-2728-0984 information principalInvestigator NOAA-MMS NOAA and MMS Marine Minerals Geochemical Database theme <gco:CharacterString>PANGAEA Project List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-3.0: Creative Commons Attribution 3.0 Unported textTable und geoscientificInformation 12.826494 13.340833 37.62548 38.013782 0.0 5.25 From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database. Event label thematicClassification Identification thematicClassification DEPTH, sediment/rock physicalMeasurement m m Deposit type thematicClassification Substrate type thematicClassification Description thematicClassification File name thematicClassification Uniform resource locator/link to image thematicClassification text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.858460?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: JENK1 * LATITUDE: 38.013782 * LONGITUDE: 12.826494 * ELEVATION: 150.0 m * LOCATION: Monte Inici, Sicily * METHOD/DEVICE: Hammer EVENT LABEL: JENK5 * LATITUDE: 37.866762 * LONGITUDE: 13.182636 * ELEVATION: 282.0 m * LOCATION: Monte Galiello, Sicily * METHOD/DEVICE: Hammer EVENT LABEL: JENK6 * LATITUDE: 37.625480 * LONGITUDE: 12.983288 * ELEVATION: 202.0 m * LOCATION: Monte Arencio, Sicily * METHOD/DEVICE: Hammer EVENT LABEL: JENK8 * LATITUDE: 37.870333 * LONGITUDE: 13.340833 * ELEVATION: 772.0 m * LOCATION: Rocca Argenteria, Sicily * METHOD/DEVICE: Hammer EVENT LABEL: JENK9 * LATITUDE: 37.967667 * LONGITUDE: 13.253833 * ELEVATION: 1124.0 m * LOCATION: Monte Kumeta, Sicily * METHOD/DEVICE: Hammer Related to <gco:CharacterString>Fig. 8 Fossil ferromanganese nodules from various localities of Middle Jurassic limestone in western Sicily</gco:CharacterString> hdl:10013/epic.46903.d011 documentDigital Related to <gco:CharacterString>Fig.10 Iron-manganese crust with "cauliflower" structures in limestone. Vertical section. Monte Inici, Western Sicily</gco:CharacterString> hdl:10013/epic.46903.d012 documentDigital Related to <gco:CharacterString>Fig.12 Ferromanganese-encrusted ammonites from various localities of Middle Jurassic limestone in western Sicily</gco:CharacterString> hdl:10013/epic.46903.d014 documentDigital