Jenkyns, Hugh C (1970): Field observation of fossil manganese nodules and crusts in the the West Sicilian Jurassic limestone beds [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.858460, Supplement to: Jenkyns, HC (1970): Fossil managese nodules from the West Sicilian Jurassic. Eclogae Geologicae Helvetiae, 63(2), 741-774, https://doi.org/10.5169/seals-163867
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Published: 1970 (exact date unknown) • DOI registered: 2016-03-24
Abstract:
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.
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Coverage:
Median Latitude: 37.868805 * Median Longitude: 13.117417 * South-bound Latitude: 37.625480 * West-bound Longitude: 12.826494 * North-bound Latitude: 38.013782 * East-bound Longitude: 13.340833
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 5.250 m
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Comment:
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.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Jenkyns, Hugh C | |||
| 2 | Identification | ID | Jenkyns, Hugh C | |||
| 3 | DEPTH, sediment/rock | Depth sed | m | Jenkyns, Hugh C | Geocode | |
| 4 | Deposit type | Deposit type | Jenkyns, Hugh C | |||
| 5 | Substrate type | Substrate | Jenkyns, Hugh C | |||
| 6 | Description | Description | Jenkyns, Hugh C | |||
| 7 | File name | File name | Jenkyns, Hugh C | |||
| 8 | Uniform resource locator/link to image | URL image | Jenkyns, Hugh C |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
28 data points
Data
| 1 Event | 2 ID | 3 Depth sed [m] | 4 Deposit type | 5 Substrate | 6 Description | 7 File name | 8 URL image |
|---|---|---|---|---|---|---|---|
| JENK1 | JENK1-1-11 | 0.000 | Mn nodule | Large discoid manganese nodule at bedding surface | Fig11_Jenkyns_1970.jpg | hdl:10013/epic.46903.d013 | |
| JENK5 | JENK5-1-3 | 5.250 | Fe-Mn crust | Rock; limestone | Ferromanganese crust capping a white Liassic limestone with Strornatactis cavities, overlain by lensing Toarcian iron pisolite. Polished section | Fig3_Jenkyns2_1970.jpg | hdl:10013/epic.46903.d008 |
| JENK6 | JENK6-1-4 | 0.000 | Mn nodule | Core; iron pisolite | Polished section of a ferromanganese nodule with an iron pisolite core | Fig4_Jenkyns2_1970.jpg | hdl:10013/epic.46903.d009 |
| JENK8 | JENK8-1-3 | 2.300 | Mn nodule | Bed of ferromanganese nodules with a distinctive concentric layered structure | Fig3_Jenkyns_1970.jpg | hdl:10013/epic.46903.d007 | |
| JENK9 | JENK9-1-5 | 0.000 | Fe-Mn crust | Rock; limestone | Thick ferromanganese crust with limestone interstices. Bedding surface | Fig5_Jenkyns_1970.jpg | hdl:10013/epic.46903.d010 |