Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 1970 Field observation of fossil manganese nodules and crusts in the the West Sicilian Jurassic limestone beds dataset https://doi.org/10.1594/PANGAEA.858460 Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 1970 Fossil managese nodules from the West Sicilian Jurassic Eclogae Geologicae Helvetiae 63(2) https://doi.org/10.5169/seals-163867 741-774 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. Fig. 8 Fossil ferromanganese nodules from various localities of Middle Jurassic limestone in western Sicily hdl:10013/epic.46903.d011 Fig.10 Iron-manganese crust with "cauliflower" structures in limestone. Vertical section. Monte Inici, Western Sicily hdl:10013/epic.46903.d012 Fig.12 Ferromanganese-encrusted ammonites from various localities of Middle Jurassic limestone in western Sicily hdl:10013/epic.46903.d014 12.826494 13.340833 37.62548 38.013782 13.1174168 37.8688048 0.0 5.25 irregular surface NOAA-MMS NOAA and MMS Marine Minerals Geochemical Database https://wiki.pangaea.de/wiki/NOAA-MMS JENK1 38.013782 12.826494 Monte Inici, Sicily 150.0 Hammer HAM JENK5 37.866762 13.182636 Monte Galiello, Sicily 282.0 Hammer HAM JENK6 37.62548 12.983288 Monte Arencio, Sicily 202.0 Hammer HAM JENK8 37.870333 13.340833 Rocca Argenteria, Sicily 772.0 Hammer HAM JENK9 37.967667 13.253833 Monte Kumeta, Sicily 1124.0 Hammer HAM 28 CC-BY-3.0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/ 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 Event Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 Event Identification ID Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 ID DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 Depth sed [m] Deposit type Deposit type Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 Deposit type Substrate type Substrate substrate Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 Substrate Description Description description Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 Description File name File name Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 File name Uniform resource locator/link to image URL image Jenkyns Hugh C hughj@earth.ox.ac.uk 0000-0002-2728-0984 URL image supplement citable author28062 event2797717 event2797721 event2797722 event2797724 event2797725 geocode1 geocode1600 geocode1601 geocode8128 journal16588 license101 method11122 param144749 param25541 param48490 param54243 param7055 param7056 pi28062 project4198 ref79235 ref79236 ref79237 ref79238 term1073131 term34114 term34118 term34119 term34121 term34122 term38263 term40710 term41044 term41056 term43863 topotype6