Citation:

dsdp.proc.61.1981

Name: Annotated record of the detailed examination of Mn deposits from DSDP Leg 61 (Holes 462 and 462A)
Published: 1981
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The goal of Site 462 was to study the paleontologic, sedimentary, petrologic, tectonic, and magnetic histories of that area through Recent to Late Jurassic time by drilling a deep re-entry site into the Nauru Basin west of the Ralik Chain of the Marshall Islands. This area formed at a fast-spreading Pacific Plate boundary 145 to 155 m.y. ago, in the Late Jurassic. Cores from this area allow to better understand the biostratigraphic evolution and sedimentary processes in a Mesozoic open-ocean environment, the petrologic nature of fast-spreading oceanic crust, the tectonic history of the Late Jurassic Pacific Plate, and the nature of the Jurassic magnetic quiet zone.

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):

Deep Sea Drilling Project (DSDP)

NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)

Coverage:

Median Latitude: 7.239600 * Median Longitude: 165.031100 * South-bound Latitude: 7.237500 * West-bound Longitude: 165.030500 * North-bound Latitude: 7.241700 * East-bound Longitude: 165.031700

Date/Time Start: 1978-05-28T00:00:00 * Date/Time End: 1978-06-09T00:00:00

Minimum DEPTH, sediment/rock: 34.03 m * Maximum DEPTH, sediment/rock: 573.38 m

Event(s):

61-462 * Latitude: 7.237500 * Longitude: 165.030500 * Date/Time: 1978-05-28T00:00:00 * Elevation: -5181.0 m * Penetration: 617 m * Recovery: 386 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 70 cores; 627.4 m cored; 0 m drilled; 61.5 % recovery

61-462A * Latitude: 7.241700 * Longitude: 165.031700 * Date/Time: 1978-06-09T00:00:00 * Elevation: -5177.0 m * Penetration: 1068.5 m * Recovery: 344 m * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 90 cores; 619.5 m cored; 14.5 m drilled; 55.5 % recovery

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	Method/Device	Comment
1	Event label	Event
2	Identification	ID
3	Sample code/label	Sample label
4	DEPTH, sediment/rock	Depth sed	m		Geocode
5	Position	Position		Visual description
6	Deposit type	Deposit type
7	Quantity of deposit	Quantity
8	Size	Size
9	Substrate type	Substrate
10	Sediment type	Sediment
11	Comment	Comment
12	Description	Description

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

71 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 ID	3 Sample label	4 Depth sed [m]	5 Position	6 Deposit type	7 Quantity	8 Size	9 Substrate	10 Sediment	11 Comment	12 Description
61-462	61-462-4-4,53-1	61-462-4-4,53	34.03	In sediment	Mn micronodule	Many			Sand	Light yellow brown laminated ashy foraminiferal sand (Plioene)	30% Mn micronodules (Site 462, Core 4, Cored interval: 29.0 to 38.5 m, page 153)
61-462	61-462-18-3,80-1	61-462-18-3,80	165.80	Buried	Mn coating	Several		Foraminifera	Ooze	Very pale brown calcareous radiolarian ooze (Lower Miocene)	Turning darker due to thin films of manganese coating some of the foraminifera. (Site 462, Core 18, Cored interval: 162.0 to 171.5 m, page 160)
61-462	61-462-22-1,30-1	61-462-22-1,30	200.30	Buried	Mn coating	Several		Foraminifera	Ooze	Sandy firm radiolarian ooze (Upper Oligocene)	Large forminifera with volcanic and shallow water fossil grains all stained by Fe-Mn oxides (Site 462, Core 22, Cored interval: 200.0 to 209.5 m, page 162)
61-462	61-462-40-1-CC,0-1	61-462-40-1-CC,0	371.50	Buried	Mn coating	1		Pebble; porcellanite	Hard ground	One moderate orange pink porcellanite	Basaltic glass replaced by clay material with a visible rim of Fe hydroxides coats the fragment. (Site 462, Core 40, Cored interval: 371.0 to 380.5 m, page 169)
61-462	61-462-59-2,30-1	61-462-59-2,30	551.30	In sediment	Mn rich layer	1	3.0 thick		Mudstone	Reddish brown zeolitic mudstone (Cretaceous)	A Fe-Mn rich 3 cm. thick bed occurs at 1.8 m (Site 462, Core 59, Cored interval: 549.5 to 558.5 m, page 175)
61-462	61-462-60-2,103-107-1	61-462-60-2,103-107	561.05	Buried	Mn coating	1		Rock; basalt	Hard ground	Altered basalt with sill interior	Secondary green smectite and iron-manganese oxides (Site 462A, Core 60, Section 2, Core interval: 560.0 to 561.5 m, Visual core description for igneous rocks, page 177)
61-462A	61-462A-15-1,44-48-1	61-462A-15-1,44-48	566.95	Buried	Mn coating	1		Rock; basalt	Hard ground	Higly altered basalt from sill margin with alteration vein	Pyroxene replaced by green clay with Fe-Mn oxides and hydroxides (Site 462A, Core 15, Section 1, Core interval: Core interval: 566.5 to 568.0 m, Visual core description for igneous rocks, page 208)
61-462A	61-462A-16-1,137-140-1	61-462A-16-1,137-140	573.38	Buried	Mn coating	1		Rock; basalt	Hard ground	Altered basalt	Vein contains, quartz, brown clay and Fe-Mn oxides and hydroxides (Site 462A, Core 16, Section 1, Core interval: 572.0 to 573.5 m, Visual core description for igneous rocks, page 209)