/* DATA DESCRIPTION:
Citation:	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
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) (URI: https://www-odp.tamu.edu:443/)
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 (URI: https://doi.org/10.2973/odp.proc.ir.121.1989) * BASIS: Joides Resolution (URI: https://www-odp.tamu.edu:443/resolutn.html) * 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 (URI: https://doi.org/10.2973/odp.proc.ir.121.1989) * BASIS: Joides Resolution (URI: https://www-odp.tamu.edu:443/resolutn.html) * 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 (URI: https://doi.org/10.2973/odp.proc.ir.121.1989) * BASIS: Joides Resolution (URI: https://www-odp.tamu.edu:443/resolutn.html) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: 23 cores; 170 m cored; 0 m drilled; 75.5 % recovery
	121-754B * LATITUDE: -30.941000 * LONGITUDE: 93.566500 * DATE/TIME START: 1988-05-15T05:15:00 * DATE/TIME END: 1988-05-18T05:40:00 * ELEVATION: -1076.0 m * PENETRATION: 354.7 m * RECOVERY: 91.85 m * LOCATION: South Indian Ridge, South Indian Ocean * CAMPAIGN: Leg121 (URI: https://doi.org/10.2973/odp.proc.ir.121.1989) * BASIS: Joides Resolution (URI: https://www-odp.tamu.edu:443/resolutn.html) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: 24 cores; 232 m cored; 0 m drilled; 39.6 % recovery
	121-755A * LATITUDE: -31.030000 * LONGITUDE: 93.546700 * DATE/TIME START: 1988-05-22T15:00:00 * DATE/TIME END: 1988-05-24T07:30:00 * ELEVATION: -1069.0 m * PENETRATION: 208.4 m * RECOVERY: 80.21 m * LOCATION: South Indian Ridge, South Indian Ocean * CAMPAIGN: Leg121 (URI: https://doi.org/10.2973/odp.proc.ir.121.1989) * BASIS: Joides Resolution (URI: https://www-odp.tamu.edu:443/resolutn.html) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: 19 cores; 178.4 m cored; 0 m drilled; 45 % 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):	Event label (Event)
	Sample code/label (Sample label) * PI: Gibson, Ian L * METHOD/DEVICE: DSDP/ODP/IODP sample designation (URI: hdl:10013/epic.27914.d001)
	Number (No) * PI: Gibson, Ian L * COMMENT: XRD
	DEPTH, sediment/rock [m] (Depth sed) * GEOCODE
	Depth, reconstructed [m] (Reconstr depth) * PI: Gibson, Ian L * METHOD/DEVICE: Calculated * COMMENT: stratigraphic depth
	Mineral name (Mineral) * PI: Gibson, Ian L * METHOD/DEVICE: X-ray diffraction (XRD) * COMMENT: silica phase
	Heulandite (Hul) * PI: Gibson, Ian L * METHOD/DEVICE: X-ray diffraction (XRD) * COMMENT: heulandite/clinoptilolite, X = phase identified as present
	Clay (Clay) * PI: Gibson, Ian L * METHOD/DEVICE: X-ray diffraction (XRD) * COMMENT: numbers indicate the angstrom spacing of the major basal reflection of air-dried and glycolated samples
	Mineral name (Mineral) * PI: Gibson, Ian L * METHOD/DEVICE: X-ray diffraction (XRD) * COMMENT: other
	Plagioclase (Pl) * PI: Gibson, Ian L * METHOD/DEVICE: X-ray diffraction (XRD) * COMMENT: X = phase identified as present
	Calcium carbonate [%] (CaCO3) * PI: Gibson, Ian L
License:	Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/)
Size:	268 data points
*/
Event	Sample label (DSDP/ODP/IODP sample designation)	No (XRD)	Depth sed [m]	Reconstr depth [m] (stratigraphic depth, Calculated)	Mineral (silica phase, X-ray diffracti...)	Hul (heulandite/clinoptilolite, X ...)	Clay (numbers indicate the angstrom...)	Mineral (other, X-ray diffraction (XRD))	Pl (X = phase identified as prese...)	CaCO3 [%]
121-753A	121-753A-6H-2,36-37		45.5	45.5	Fresh glass					
121-753A	121-753A-6H-3,34-35		46.9	46.9	Fresh glass					
121-753A	121-753A-7H-3,35-36		56.6	56.5	Fresh glass					
121-753A	121-753A-7H-5,107-107		60.3	60.3	Fresh glass					
121-752B	121-752B-7R-4,100-102	54	321.6	398.6		X	diffuse -> 16.5		X	47.6
121-752B	121-752B-8R-2,124-127	53	327.2	404.2	opal-CT?	X	12.5 -> 16.5		X	29.7
121-752B	121-752B-8R-3,148-150	50	328.9	405.9	opal-CT?		none -> none			
121-752B	121-752B-10R-7,25-28	79	354.4	431.4			none -> none		X	24.2
121-752B	121-752B-11R-1,41-44	84	355.2	432.2		X	12.5 -> 16		X	4.0
121-752B	121-752B-11R-2,78-80	85	357.1	434.1		X	12 -> 16.2		X	9.5
121-752B	121-752B-16R-3,83-86	51	406.8	483.8			12.5 -> 16.5		X	37.0
121-754A	121-754A-21H-1,79-81	8	167.9	509.9		X	11.8 -> 16.2			51.5
121-754B	121-754B-23H-1,70-72	0	171.8	513.8		X	12.2 -> 15.9		X	25.0
121-754B	121-754B-5R-2,24-25	19	153.4	495.4		X	11.5 -> 16.5		X	59.6
121-754B	121-754B-7R-1,28-30	55	171.0	513.0			12.3 -> 16.2	mordenite		56.9
121-754B	121-754B-9R-2,78-80	48	192.6	534.6	opal-CT?	X	12.7 -> 17	mordenite	X	59.8
121-754B	121-754B-9R-2,132-135	49	193.1	535.1	opal-CT?		12.8 -> 16.9	stilbite	X	35.7
121-754B	121-754B-9R-5,69-71	47	197.0	539.0	opal-CT		12.6 -> 17	mordenite	X	64.1
121-754B	121-754B-9R-6,82-83	45	198.6	540.6	opal-CT	X	12.9 -> 16.9	mordenite		58.9
121-754B	121-754B-9R-6,103-105	23	198.8	540.8	opal-CT		12.8 -> 16.2	mordenite	X	9.1
121-754B	121-754B-9R-6,107-108	44	198.9	540.9	opal-CT	X	12.4 -> 16.2		X	21.8
121-754B	121-754B-10R-3,133-134	46	204.3	546.3	opal-CT		12.8 -> 17	stilbite	X	51.5
121-754B	121-754B-11R-1,80-81	22	210.4	552.4	opal-CT	X	12.6 -> 16.1		X	14.1
121-754B	121-754B-12R-CC,0-2	21	221.0	563.0	opal-CT		diffuse		X	66.6
121-754B	121-754B-13R-3,50-54	24	231.4	573.4	opal-CT		12.8 -> 16.7	mordenite	X	22.5
121-754B	121-754B-13R-4,106-109	25	233.4	575.4	opal-CT	X	12.8 -> 16.5	stilbite	X	20.5
121-754B	121-754B-14R-5,93-95	18	245.3	587.3	opal-CT	X	13.5 -> 17.7		X	19.5
121-754B	121-754B-15R-3,96-98	7	252.2	594.2		X	12.6 -> 15.8			25.9
121-754B	121-754B-15R-3,102	80	252.2	594.2		X	10 -> 13.6		X	27.1
121-754B	121-754B-15R-5,25-28		254.4	596.4	opal-CT	X	12.7 -> 16.7		X	7.4
121-755A	121-755A-6R-1,56-58	87	72.7	1164.2	opal-CT	mordenite	12.6 -> 15.8			20.2
121-755A	121-755A-7R-2,72-75	86	84.0	1175.5	quartz	mordenite	12.6 -> 16		X	13.1
121-755A	121-755A-9R-1,128-131	75	102.5	1194.0	quartz	stilbite			X	16.6
121-755A	121-755A-12R-1,1-4	76	131.1	1222.6	quartz	mordenite	12.6, 14.6 -> 16		X	18.7
121-755A	121-755A-13R-3,75-78	81	144.4	1235.9	quartz	mordenite	12.9, 14.0 -> 16		X	20.7
121-755A	121-755A-14R-2,62-65	82	153.9	1245.4	quartz	X	12.8, 14.7 -> 16.5		X	18.8
121-755A	121-755A-18R-6,123-125	77	196.8	1288.3	quartz?	X	12.5, 14.2 -> 14.2		X	1.7
121-755A	121-755A-19R-2,54	78			quartz	X	14.1 -> 14.5		X	
121-755A	121-755A-19R-6,12	83			quartz?	X	14 -> 15.2		X	2.7