Batiza, Rodey; Rosendahl, Bruce R; Fisher, Robert L (1977): Annotated record of the detailed examination of Mn deposits from the QUEBRADA (1969) and SIQUEIROS (1974) expeditions around the East Pacific Rise [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.860429, Supplement to: Batiza, R et al. (1977): Evolution of oceanic crust: 3. Petrology and chemistry of basalts from the East Pacific Rise and the Siqueiros Transform Fault. Journal of Geophysical Research, 82(2), 265-276, https://doi.org/10.1029/JB082i002p00265
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Abstract:
Basalt samples obtained from the Siqueiros transform fault/fracture zone and the adjacent East Pacific Rise are mostly very fresh oceanic tholeiite and fractionated oceanic tholeiite with Fe+3/ Fe+2 ? 0.25; however, alkali basalts occur in the area as well. The rocks of the tholeiitic suite are ol + pl phyric and ol + pl + cpx phyric basalts, while the alkali basalts are ol and ol + pl phyric. Microprobe analyses of the tholeiitic suite phenocrysts indicate that they are Fo68-Fo86, An58-An75, and augite (Ca34Mg50Fe16). The range of olivine and plagioclase compositions represents the chemical variation of the phenocryst compositions with fractionation. The phenocyrsts in the alkali basalts are Fo81 and An69. The suite of tholeiites comprises a fractionation series characterized by relative enrichment of Fe, Ti, Mn, V, Na, K, and P and depletion of Ca, Al, Mg, Ni, and Cr. The fractionated tholeiites occur on the median ridge (which is a sliver of normal oceanic crust) of the double Siqueiros transform fault, on the western Siqueiros fracture zone, and on the adjoining East Pacific Rise, while the two transform fault troughs contain mostly unfractionated or only slightly fractionated tholeiite. We suggest that the fractionated tholeiites are produced by fractional crystallization of more 'primitive' tholeiitic liquid in a crustal magma chamber below the crest of the East Pacific Rise. This magma chamber may be disrupted by the transform fault troughs, thus explaining the paucity of fractionated tholeiites in the troughs. The alkali basalts are found only on the flanks of a topographic high near the intersection of the northern transform trough with the East Pacific Rise.
Source:
Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT
Further details:
Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN
Project(s):
Coverage:
Median Latitude: 8.190859 * Median Longitude: -104.010284 * South-bound Latitude: 8.123684 * West-bound Longitude: -105.098355 * North-bound Latitude: 8.383000 * East-bound Longitude: -103.150032
Date/Time Start: 1964-07-04T00:00:00 * Date/Time End: 1969-12-01T00:00:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
QBR-17D * Latitude: 8.150308 * Longitude: -103.383365 * Date/Time: 1969-12-01T00:00:00 * Elevation: -3705.0 m * Location: Pacific Ocean * Campaign: QUEBRADA * Basis: Thomas Washington * Method/Device: Dredge (DRG)
QBR-19D * Latitude: 8.150319 * Longitude: -103.150032 * Date/Time: 1969-12-01T00:00:00 * Elevation: -2145.0 m * Location: Pacific Ocean * Campaign: QUEBRADA * Basis: Thomas Washington * Method/Device: Dredge (DRG)
SIQR-2D * Latitude: 8.123684 * Longitude: -105.098355 * Date/Time: 1964-07-04T00:00:00 * Elevation: -3692.0 m * Location: Pacific Ocean * Campaign: SIQUEIROS * Basis: Thomas Washington * Method/Device: Dredge (DRG)
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 | Batiza, Rodey | |||
| 2 | Identification | ID | Batiza, Rodey | |||
| 3 | DEPTH, sediment/rock | Depth sed | m | Batiza, Rodey | Geocode | |
| 4 | Position | Position | Batiza, Rodey | Visual description | ||
| 5 | Deposit type | Deposit type | Batiza, Rodey | |||
| 6 | Quantity of deposit | Quantity | Batiza, Rodey | |||
| 7 | Substrate type | Substrate | Batiza, Rodey | |||
| 8 | Description | Description | Batiza, Rodey | |||
| 9 | Uniform resource locator/link to image | URL image | Batiza, Rodey |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
31 data points
Data
| 1 Event | 2 ID | 3 Depth sed [m] | 4 Position | 5 Deposit type | 6 Quantity | 7 Substrate | 8 Description | 9 URL image |
|---|---|---|---|---|---|---|---|---|
| SIQR-2D | SIQR-2D-1 | 0 | Surface | Mn nodule | Few | Mn nodules, small collection | ||
| SIQR-3D | SIQR-3D-1 | 0 | Surface | Mn coating | Few | Rock; basalt | Mn coating on basalt | library.ucsd.edu |
| SIQR-4D | SIQR-4D-1 | 0 | Surface | Mn nodule | Few | Core; basalt fragment | Mn nodules, small collection with core of fresh glassy basalt | library.ucsd.edu |
| QBR-17D | QBR-17D-1 | 0 | Surface | Mn crust | Several | Rock; basalt | 1 cm Mn oxide crust on basalt angular blocks and pillows | |
| QBR-19D | QBR-19D-1 | 0 | Surface | Mn crust | Several | Rock; basalt | 1 cm Mn oxide crust on basalt angular blocks and pillows |