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Gibson, Ian L (1991): Composition of Broken Ridge samples (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.759426, Supplement to: Gibson, IL (1991): Diagenesis, heat flow, and rifting at Broken Ridge, Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 519-523, https://doi.org/10.2973/odp.proc.sr.121.164.1991

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Published: 1991 (exact date unknown) • DOI registered: 2011-05-11

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Abstract:
The Broken Ridge tilted and truncated sequence of middle Eocene to Turanian calcareous sediments with intercalated basaltic ash layers is characterized by diagenetic alteration. The level at which opal-CT forms from volcanic glass and the opal-CT/quartz boundary shows that this alteration increases in intensity with stratigraphic depth and is not related to depth below the seafloor. Thus, the rocks were altered before they were tilted and truncated. The preservation of the pre-rift alteration history may be a function of the rapid uplift and erosion following the initiation of spreading between Broken Ridge and the Kerguelen Plateau. The geothermal gradient at the time of rifting, deduced from the pattern of silica diagenesis, agrees with results from present-day heat-flow measurements and suggests that there was no large thermal anomaly at Broken Ridge that time.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -30.928400 * Median Longitude: 93.569420 * South-bound Latitude: -31.030000 * West-bound Longitude: 93.546700 * North-bound Latitude: -30.839000 * East-bound Longitude: 93.589900
Date/Time Start: 1988-05-12T16:30:00 * Date/Time End: 1988-05-24T07:30:00
Minimum DEPTH, sediment/rock: 45.5 m * Maximum DEPTH, sediment/rock: 406.8 m
Event(s):
121-752B  * Latitude: -30.891000 * Longitude: 93.577500 * Date/Time Start: 1988-05-18T09:00:00 * Date/Time End: 1988-05-22T12:30:00 * Elevation: -1097.0 m * Penetration: 435.6 m * Recovery: 112.34 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 158 m cored; 0 m drilled; 71.1 % recovery
121-753A  * Latitude: -30.839000 * Longitude: 93.589900 * Date/Time Start: 1988-05-12T16:30:00 * Date/Time End: 1988-05-13T06:15:00 * Elevation: -1187.0 m * Penetration: 62.8 m * Recovery: 61.06 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 62.8 m cored; 0 m drilled; 97.2 % recovery
121-754A  * Latitude: -30.941000 * Longitude: 93.566500 * Date/Time Start: 1988-05-13T18:30:00 * Date/Time End: 1988-05-15T05:15:00 * Elevation: -1075.0 m * Penetration: 172.1 m * Recovery: 128.27 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 170 m cored; 0 m drilled; 75.5 % recovery
Comment:
At Site 753, stratigraphic depth = mbsf; at Site 752, stratigraphic depth = mbsf + 77 m; at Site 754, stratigraphic depth = mbsf + 342 m; at Site 755, stratigraphic depth = mbsf + 1091.5 m. These transformations assume that 190 m of the section is missing between Sites 753 and 752, that there is a 20-m overlap between Sites 752 and 754, and that 460 m of the section is missing between Sites 754 and 755.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Sample code/labelSample labelGibson, Ian LDSDP/ODP/IODP sample designation
3 NumberNoGibson, Ian LXRD
4 DEPTH, sediment/rockDepth sedmGeocode
5 Depth, reconstructedReconstr depthmGibson, Ian LCalculatedstratigraphic depth
6 Mineral nameMineralGibson, Ian LX-ray diffraction (XRD)silica phase
7 HeulanditeHulGibson, Ian LX-ray diffraction (XRD)heulandite/clinoptilolite, X = phase identified as present
8 ClayClayGibson, Ian LX-ray diffraction (XRD)numbers indicate the angstrom spacing of the major basal reflection of air-dried and glycolated samples
9 Mineral nameMineralGibson, Ian LX-ray diffraction (XRD)other
10 PlagioclasePlGibson, Ian LX-ray diffraction (XRD)X = phase identified as present
11 Calcium carbonateCaCO3%Gibson, Ian L
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
268 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 
No
(XRD)		4 
Depth sed [m]		5 
Reconstr depth [m]
(stratigraphic depth, Calculated)		6 
Mineral
(silica phase, X-ray diffracti...)		7 
Hul
(heulandite/clinoptilolite, X ...)		8 
Clay
(numbers indicate the angstrom...)		9 
Mineral
(other, X-ray diffraction (XRD))		10 
Pl
(X = phase identified as prese...)		11 
CaCO3 [%]
121-753A 121-753A-6H-2,36-3745.545.5Fresh glass
121-753A121-753A-6H-3,34-3546.946.9Fresh glass
121-753A121-753A-7H-3,35-3656.656.5Fresh glass
121-753A121-753A-7H-5,107-10760.360.3Fresh glass
121-752B 121-752B-7R-4,100-10254321.6398.6Xdiffuse -> 16.5X47.6
121-752B121-752B-8R-2,124-12753327.2404.2opal-CT?X12.5 -> 16.5X29.7
121-752B121-752B-8R-3,148-15050328.9405.9opal-CT?none -> none
121-752B121-752B-10R-7,25-2879354.4431.4none -> noneX24.2
121-752B121-752B-11R-1,41-4484355.2432.2X12.5 -> 16X4.0
121-752B121-752B-11R-2,78-8085357.1434.1X12 -> 16.2X9.5
121-752B121-752B-16R-3,83-8651406.8483.812.5 -> 16.5X37.0
121-754A 121-754A-21H-1,79-818167.9509.9X11.8 -> 16.251.5
121-754B 121-754B-23H-1,70-720171.8513.8X12.2 -> 15.9X25.0
121-754B121-754B-5R-2,24-2519153.4495.4X11.5 -> 16.5X59.6
121-754B121-754B-7R-1,28-3055171.0513.012.3 -> 16.2mordenite56.9
121-754B121-754B-9R-2,78-8048192.6534.6opal-CT?X12.7 -> 17mordeniteX59.8
121-754B121-754B-9R-2,132-13549193.1535.1opal-CT?12.8 -> 16.9stilbiteX35.7
121-754B121-754B-9R-5,69-7147197.0539.0opal-CT12.6 -> 17mordeniteX64.1
121-754B121-754B-9R-6,82-8345198.6540.6opal-CTX12.9 -> 16.9mordenite58.9
121-754B121-754B-9R-6,103-10523198.8540.8opal-CT12.8 -> 16.2mordeniteX9.1
121-754B121-754B-9R-6,107-10844198.9540.9opal-CTX12.4 -> 16.2X21.8
121-754B121-754B-10R-3,133-13446204.3546.3opal-CT12.8 -> 17stilbiteX51.5
121-754B121-754B-11R-1,80-8122210.4552.4opal-CTX12.6 -> 16.1X14.1
121-754B121-754B-12R-CC,0-221221.0563.0opal-CTdiffuseX66.6
121-754B121-754B-13R-3,50-5424231.4573.4opal-CT12.8 -> 16.7mordeniteX22.5
121-754B121-754B-13R-4,106-10925233.4575.4opal-CTX12.8 -> 16.5stilbiteX20.5
121-754B121-754B-14R-5,93-9518245.3587.3opal-CTX13.5 -> 17.7X19.5
121-754B121-754B-15R-3,96-987252.2594.2X12.6 -> 15.825.9
121-754B121-754B-15R-3,10280252.2594.2X10 -> 13.6X27.1
121-754B121-754B-15R-5,25-28254.4596.4opal-CTX12.7 -> 16.7X7.4
121-755A 121-755A-6R-1,56-588772.71164.2opal-CTmordenite12.6 -> 15.820.2
121-755A121-755A-7R-2,72-758684.01175.5quartzmordenite12.6 -> 16X13.1
121-755A121-755A-9R-1,128-13175102.51194.0quartzstilbiteX16.6
121-755A121-755A-12R-1,1-476131.11222.6quartzmordenite12.6, 14.6 -> 16X18.7
121-755A121-755A-13R-3,75-7881144.41235.9quartzmordenite12.9, 14.0 -> 16X20.7
121-755A121-755A-14R-2,62-6582153.91245.4quartzX12.8, 14.7 -> 16.5X18.8
121-755A121-755A-18R-6,123-12577196.81288.3quartz?X12.5, 14.2 -> 14.2X1.7
121-755A121-755A-19R-2,5478quartzX14.1 -> 14.5X
121-755A121-755A-19R-6,1283quartz?X14 -> 15.2X2.7