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Riech, Volkher (1981): (Table 1) Characteristics of silicified sediments at DSDP Site 61-462 according to host-rock lithology, opal-CT-to-quartz ratio, and the origin of the quartz phase [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.819840, Supplement to: Riech, V (1981): Siliceous sediments from the Nauru Basin: Diagenetic alteration of biogenic opal and authigenesis of silica and silicates. In: Larson, RL; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 61, 523-531, https://doi.org/10.2973/dsdp.proc.61.109.1981

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Published: 1981 (exact date unknown) • DOI registered: 2013-10-28

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Abstract:
This study deals with the mineralogical variability of siliceous and zeolitic sediments, porcellanites, and cherts at small intervals in the continuously cored sequence of Deep Sea Drilling Project Site 462. Skeletal opal is preserved down to a maximum burial depth of 390 meters (middle Eocene). Below this level, the tests are totally dissolved or replaced and filled by opal-CT, quartz, clinoptilolite, and calcite. Etching of opaline tests does not increase continously with deeper burial. Opal solution accompanied by a conspicuous formation of authigenic clinoptilolite has a local maximum in Core 16 (150 m). A causal relationship with the lower Miocene hiatus at this level is highly probable.
Oligocene to Cenomanian sediments represent an intermediate stage of silica diagenesis: the opal-CT/quartz ratios of the silicified rocks are frequently greater than 1, and quartz filling pores or replacing foraminifer tests is more widespread than quartz which converted from an opal-CT precursor.
As at other sites, there is a marked discontinuity of the transitions from biogenic opal via opal-CT to quartz with increasing depth of burial. Layers with unaltered opal-A alternate with porcellanite beds; the intensity of the opal-CT-to-quartz transformation changes very rapidly from horizon to horizon and obviously is not correlated with lithologic parameters.
The silica for authigenic clinoptilolite was derived from biogenic opal and decaying volcanic components.
Project(s):
Deep Sea Drilling Project (DSDP)
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 Elevation: -5181.0 m * Maximum Elevation: -5177.0 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: Leg61 * 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: Leg61 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 90 cores; 619.5 m cored; 14.5 m drilled; 55.5 % recovery
Comment:
- = no data, + = least abundant, ++++ = most abundant, ? = unknowns.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Sample code/labelSample labelRiech, VolkherDSDP/ODP/IODP sample designation
3 Lithology/composition/faciesLithologyRiech, VolkherX-ray diffraction (XRD)Of silicified rock
4 Main LithologyMain lithRiech, VolkherX-ray diffraction (XRD)Calcareous
5 Main LithologyMain lithRiech, VolkherX-ray diffraction (XRD)Siliceous
6 QuartzQzRiech, VolkherX-ray diffraction (XRD)Early Diagenetic
7 --Riech, VolkherX-ray diffraction (XRD)Opal-CT/quartz ratio
8 --Riech, VolkherX-ray diffraction (XRD)Stage of opal-CT - quartz transformation: + = small amount of opal-CT starts to transform into quartz, ++++ = all opal-CT transformed into quartz
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
273 data points

Data

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

1 
Event		2 
Sample label
(DSDP/ODP/IODP sample designation)		3 
Lithology
(Of silicified rock, X-ray dif...)		4 
Main lith
(Calcareous, X-ray diffraction...)		5 
Main lith
(Siliceous, X-ray diffraction ...)		6 
Qz
(Early Diagenetic, X-ray diffr...)		7 
-
(Opal-CT/quartz ratio, X-ray d...)		8 
-
(Stage of opal-CT - quartz tra...)
61-462 61-462-32-2,64-66Radiolarian porecellanite-+ + + +-Infinity-
61-462A 61-462A-H1-CCCalcareous porcellanite+ + + +++>>1-
61-46261-462-34-CCRadiolarian porcellanite-+ + + ++>>1-
61-46261-462-40-CCOpal-CT-bearing quartzose chert+ + + +-+ + +<1?
61-462A61-462A-H2-1,40-43Porcellanite with quartzose patches+ + + +++>1+ +
61-462A61-462A-H2-1,55-60(1)Porcellaneous radiolarian claystone-+ + + +->>1-
61-462A61-462A-H2-1,55-60(2)Calcareous quartz-bearing porcellanite+ + + +++ +>1?
61-462A61-462A-H2-1,79-83Radiolarian porcellanite-+ + + +->>1-
61-462A61-462A-H2-1,131-135Foraminiferal arenite with quartzose patches+ + + +-+ + +<1+
61-46261-462-42-1,1-4Foraminiferal limestone with opal-CT- and quartz-bearing layers+ + + +-+ +1-
61-46261-462-42-1,8-10Calcarenite, partly replaced and cemented by opal-CT and quartz+ + + +-+ + +<1+
61-46261-462-42-1,24-27Foraminifer-nannofossil limestone impregnated by opal-CT+ + + +-+ +<1-
61-46261-462-42-1,42-44Quartzose chert+ + + +-+ +0+ + + +
61-46261-462-42-1,51-54Foraminifer-nannofossil limestone impregnated by opal-CT+ + + +++ +>1-
61-46261-462-43-1,13-15Foraminifer-nannofossil limestone impregnated by opal-CT+ + + +++ +>1-
61-46261-462-43-1,39-41Calcareous porcellanite+ + + +++>1-
61-462A61-462A-3-1.24Quartzose chert+ + + +-+ +0+ + + +
61-46261-462-3-1,23-25Radiolarian porcellanite with quartz-replaced sponge spicules-+ + + ++ +>1-
61-462A61-462A-3-1,37-39Foraminiferal arenite with opal-CT and quartz+ + + +++ + +1+
61-46261-462-44-1,2-4Foraminiferal limestone impregnated by opal-CT+ + + +-+ +>1-
61-46261-462-4-1,21-23Foraminiferal limestone with opal-CT and quartz+ + + +++ +1-
61-46261-462-44-1,29-32Quartzose chert+ + + +-+ + +0+ + + +
61-46261-462-44-1,44Opal-CT-bearing limestone+ + + ++?>>1-
61-46261-462-44-1,66-67Quartzose chert+ + + +-?0+ + + +
61-462A61-462A-4-1,2-5Radiolarian porcellanite-+ + + ++ +>1-
61-462A61-462A-4-1,32-36Quartzose chert+ + + +-+ + +0+ + + +
61-462A61-462A-4-1,44-48Opal-CT-bearing quartzose chert+ + + +-+ + +<1+ + +
61-462A61-462A-4-1,62-64Marly porcellanite+ ++ ++ +>1-
61-462A61-462A-4-1,72-74Marly porcellanite+ ++ ++ +>1-
61-46261-462-45-1,7-10Opal-CT-bearing quartzose chert+ + + +-+ + +<1+
61-46261-462-47-CC(1)Quartz-bearing porcellanite+ ++ ++>1+
61-46261-462-47-CC(2)Quartzose chert+ + + +-+ + +0+ + + +
61-462A61-462A-7-1,5-7Quartz-rich porcellanite+ + +++ +1+ +
61-462A61-462A-7-1,39Porcellaneous limestone+ + ++->>1-
61-462A61-462A-7-1,127-129Porcellaneous foraminifer-nannofossil limestone+ + + +++ +>1+
61-462A61-462A-9-1,90Zeolitic radiolarian claystone with opal-CT-+ + + +-Infinity-
61-462A61-462A-12-1,31-35Zeolitic radiolarian claystone with opal-CT-+ + + +-Infinity-
61-46261-462-59-1,13-15Radiolarian porcellanite-+ + + ++ +>1+
61-462A61-462A-14-1,120Quartzose chert, rich in radiolarians and goethite (above basalt sill)-+ + ++ +0+ + + +