Citation:

odp.proc.sr.124.174.1991

Name: Isotope characterization and estimated temperature of formation of calcite veins in ODP Sites 124-768 and 124-770 (Table 1)
Published: 1991
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Secondary carbonate minerals were recovered within the basalts at both ODP Sites 768 and 770 in the Sulu and Celebes seas. Petrographic and X-ray diffraction analyses indicate that the carbonates are calcites. Other alteration products recognized in the thin sections are smectites, iron oxides, and gypsum. The 13C values of carbonates from both sites range from 1.6 per mil to 2.3 per mil, which are indicative of inorganic carbonate formation with no contributions from 13C-depleted sources such as oxidized organic carbon or methane. The oxygen isotopes at Site 770 range from 30.8 per mil to 31.6 per mil, which indicates a pervasive circulation of cold seawater (9° to 12°C) during alteration of the Celebes

Sea basalts. In contrast, carbonates associated with Site 768 basalts have less positive d18O values (21.0 per mil to 27.3 per mil). A lighter 18O isotopic signature indicates the formation of secondary calcite at either higher temperatures or in a system closed to seawater. The rapidly deposited pyroclastic flows at Site 768 would have limited water access to the crust very soon after its formation, which leads us to speculate that the carbonates in the Sulu Sea basalts were formed by isotopically modified fluids resulting from basalt alteration in a closed system.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 6.572400 * Median Longitude: 122.444100 * South-bound Latitude: 5.144800 * West-bound Longitude: 121.219800 * North-bound Latitude: 8.000000 * East-bound Longitude: 123.668400

Date/Time Start: 1988-12-01T14:30:00 * Date/Time End: 1988-12-30T18:00:00

Minimum DEPTH, sediment/rock: 458.7 m * Maximum DEPTH, sediment/rock: 1259.8 m

Event(s):

124-768C * Latitude: 8.000000 * Longitude: 121.219800 * Date/Time Start: 1988-12-01T14:30:00 * Date/Time End: 1988-12-13T07:00:00 * Elevation: -4396.0 m * Penetration: 1268.5 m * Recovery: 525.69 m * Location: Sulu Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 100 cores; 915 m cored; 0 m drilled; 57.5 % recovery

124-770C * Latitude: 5.144800 * Longitude: 123.668400 * Date/Time Start: 1988-12-24T08:00:00 * Date/Time End: 1988-12-30T18:00:00 * Elevation: -4516.0 m * Penetration: 529.5 m * Recovery: 54.81 m * Location: Mindanao Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 115.8 m cored; 0 m drilled; 47.3 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Sample code/label	Sample label		von Breymann, Marta T	DSDP/ODP/IODP sample designation
3	DEPTH, sediment/rock	Depth sed	m			Geocode – mbsf
4	Color description	Color desc		von Breymann, Marta T
5	δ13C, calcite	δ13C cal	‰ PDB	von Breymann, Marta T	Mass spectrometer Finnigan MAT 250
6	δ18O, calcite	δ18O cal	‰ PDB	von Breymann, Marta T	Mass spectrometer Finnigan MAT 250
7	δ18O, calcite	δ18O cal	‰ SMOW	von Breymann, Marta T	Mass spectrometer Finnigan MAT 250
8	Temperature, calculated	T cal	°C	von Breymann, Marta T	Calculated	0 per mil
9	Temperature, calculated	T cal	°C	von Breymann, Marta T	Calculated	-1 per mil

License:

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

Size:

154 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 Depth sed [m] (mbsf)	4 Color desc	5 δ13C cal [‰ PDB] (Mass spectrometer Finnigan MA...)	6 δ18O cal [‰ PDB] (Mass spectrometer Finnigan MA...)	7 δ18O cal [‰ SMOW] (Mass spectrometer Finnigan MA...)	8 T cal [°C] (0 per mil, Calculated)	9 T cal [°C] (-1 per mil, Calculated)
124-770C	124-770C-5R-5,48-49	458.7	light red	1.94	0.46	30.84	16	12
124-770C	124-770C-5R-5,48-49	458.7	dark red	1.64	0.77	31.16	15	11
124-770C	124-770C-6R-5,63-65	468.5	light red	1.97	0.77	31.16	15	11
124-770C	124-770C-6R-5,63-65	468.5	dark red	1.96	0.77	31.16	15	11
124-770C	124-770C-6R-5,63-65	468.5	dark red	1.70	0.47	30.85	16	12
124-770C	124-770C-6R-5,63-65	468.5	dark red	1.71	0.71	31.10	15	11
124-770C	124-770C-7R-3,93-95	475.4	white	1.94	0.65	31.04	15	11
124-770C	124-770C-12R-3,99-100	523.9	light brown	1.58	1.17	31.58	13	9
124-770C	124-770C-12R-3,99-100	523.9	light brown	1.61	1.16	31.57	13	9
124-768C	124-768C-75R-1,25-26	1066.2	gray	1.80	-6.22	23.96	50	45
124-768C	124-768C-79R-2,17-18	1092.2	gray	1.84	-8.19	21.93	63	57
124-768C	124-768C-79R-2,17-18	1092.2	gray	1.86	-8.32	21.80	64	57
124-768C	124-768C-83R-2,17-18	1112.3	gray	1.89	-6.81	23.35	54	48
124-768C	124-768C-83R-2,17-18	1112.3	gray	1.89	-6.75	23.42	54	48
124-768C	124-768C-87R-1,129-130	1137.6	gray	1.98	-9.08	21.01	70	63
124-768C	124-768C-87R-1,129-130	1137.6	gray	1.95	-8.58	21.53	66	59
124-768C	124-768C-89R-5,59-60	1161.6	gray	2.11	-2.97	27.31	32	27
124-768C	124-768C-89R-5,59-60	1161.6	gray	2.09	-3.01	27.27	32	27
124-768C	124-768C-97R-1,35-36	1230.1	gray	2.31	-4.78	25.44	42	37
124-768C	124-768C-97R-1,35-36	1230.1	gray	2.31	-4.81	25.41	42	37
124-768C	124-768C-100R-1,97-99	1259.8	gray	2.30	-7.49	22.65	59	52
124-768C	124-768C-100R-1,97-99	1259.8	gray	2.28	-7.48	22.66	58	52