Citation:

dsdp.proc.7.107.1971

Name: Annotated record of the detailed examination of Mn deposits from DSDP Site 65, Leg 7 (Cores 65-7, 65-9, 65-14, 65-17, 65A-1)
Published: 1971
License: https://creativecommons.org/licenses/by/3.0/

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Published: 1971 (exact date unknown) • DOI registered: 2016-12-12

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Abstract:

An acoustically very transparent layer is present over much of the deep basin—here termed the Central Basin—between the Gilbert and Marshall Islands on the west and the Line Islands on the east. The Pacific Panel recommended drilling in this region to sample at least the upper transparent layer, and the first opaque layer beneath. Several possible sites were considered by the panel and by the shipboard party. Of paramount importance in choosing a particular site was a concern that sufficient sediments be present to bury the bottom-hole assembly (the drill collars and bumper subs) before the bit struck hard rock. A set of nearly continuous cores of an apparently uninterrupted section of radiolarian ooze ranging in age from middle Eocene to Recent was obtained, but the bit did not reach the deepest seismic reflector. Below depths of 127 meters, in the Oligocene and Eocene, thin chert and turbidite beds are sparsely interbedded with ooze.

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: 4.353500 * Median Longitude: 176.985850 * South-bound Latitude: 4.353500 * West-bound Longitude: 176.985700 * North-bound Latitude: 4.353500 * East-bound Longitude: 176.986000

Date/Time Start: 1969-09-11T00:00:00 * Date/Time End: 1969-09-11T00:00:00

Minimum DEPTH, sediment/rock: 62.6 m * Maximum DEPTH, sediment/rock: 1129.1 m

Event(s):

7-65 * Latitude: 4.353500 * Longitude: 176.985700 * Date/Time: 1969-09-11T00:00:00 * Elevation: -6142.0 m * Penetration: 145 m * Recovery: 130.5 m * Location: North Pacific/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 144 m cored; 0 m drilled; 90.6 % recovery

7-65A * Latitude: 4.353500 * Longitude: 176.986000 * Date/Time: 1969-09-11T00:00:00 * Elevation: -6142.0 m * Penetration: 187 m * Recovery: 17.1 m * Location: North Pacific/BASIN * Campaign: * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 43 m cored; 9 m drilled; 39.8 % 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	Substrate type	Substrate
9	Sediment type	Sediment
10	Comment	Comment
11	Description	Description

License:

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

Size:

41 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 Substrate	9 Sediment	10 Comment	11 Description
7-65	7-65-7-CC,0-1	7-65-7-CC,0	62.6	In sediment	Mn micronodule	Few		Consolidated sediment	The rock is a pale yellowish-brown (10 YR7/2) to pale olive gray (5Y7/1) somewhat friable arenite (Middle Miocene)	Rare manganese micronodules, 100-500 microns. They are rounded or botryoidal, with often a core of altered volcanic debris. The presence of broken micronodules indicates that they were introduced as clastic particles, rather than formed in situ.
7-65	7-65-9-1,0-100-1	7-65-9-1,0-100	74.7	In sediment	Mn micronodule	Several		Ooze	Radiolarian ooze, slight secondary silicification, moderate brown, slight grayish orange mottling (Lower Miocene)	Scattered coarser beds rich in palagonite, ferromanganese micronodules and spicules. (Lithology and biostratigraphy of Core 9, Hole 65.0, page 884)
7-65	7-65-14-CC,0-1	7-65-14-CC,0	128.1	Buried	Mn coating	Several	Radiolaria	Consolidated sediment	Impure cristobalitic porcelanite, 40% grains of altered organic and volcanic origin (almost all of which appear to be ""floating""), and 60% groundmass that is largely cristobalite (Upper Eocene)	Of the grains, remains of radiolarians are most abundant. There is every range from sharp outlines, often accented by thin ferromanganese coatings on the walls of the radiolarians and interiors of slightly different colored matrix
7-65	7-65-17-CC,0-1	7-65-17-CC,0	147.0	In sediment	Mn micronodule	Several		Consolidated sediment	Sandstone, laminated, yellowish brown, irregularly silicified (Upper Eocene)	Grains with ferromanganese micronodules and sponge spicules. (Lithology and biostratigraphy of Core 17, Hole 65.0, page 703)
7-65A	7-65A-1-CC,0-1	7-65A-1-CC,0	1129.1	In sediment	Mn micronodule	Several		Consolidated sediment	Porcelanite, dark brownish gray, grading to clinoptilolitecristobalite mudstone (Upper Eocene)	Contains 10% of sand-size radiolarians, palagonite fragments, and ferromanganese micronodules. (Lithology and biostratigraphy of Core 1, Hole 65.1, page 704)