Betzler, Christian (1991): Occurrence and type of dolomite in ODP Site 124-768 samples (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.762900, Supplement to: Betzler, C (1991): Data report: Occurrence of dolomite at Site 768 (Sulu Sea). In: Silver, EA; Rangin, C; von Breymann, MT; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 124, 527-530, https://doi.org/10.2973/odp.proc.sr.124.141.1991
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
Occurrence of deep-sea dolomites has been reported from numerous settings (for discussion see Lumsden, 1988). Different authors agree that dolomite formation in the pelagic realm is a relatively early diagenetic process (e.g., Jorgensen, 1983; Shimmield and Price, 1984; Kablanow et al., 1984; Kulm et al., 1984). Baker and Burns (1985) suggest that most of the pelagic dolomites formed within a few tens of meters below the seafloor within the zone of microbial sulfate reduction. According to Fuechtbauer and Richter (1988), dolomite can form in the deep-sea at a minimum temperature of 10°C. Other deep-sea dolomites are products of fluids derived from underlying evaporites or submarine weathering of basalts (Garrison, 1981). In some cases (Mullins et al., 1985; Dix and Mullins, 1988; Mullins et al., 1988), the existence of dolomite is linked to disconformities and its formation may have resulted from circulation of seawater through the sediment during prolonged exposure (Dix and Mullins, 1988, p. 287).
At Site 768 (Fig. 1), lithified carbonate layers, some containing variable amounts of dolomite, occur below 201 mbsf (Miocene). These beds alternate with unconsolidated or semi-lithified marl layers interbedded in clays and siliciclastic turbidites. The irregular depth distribution of the limestone beds and the variation in preservation and recrystallization of the calcareous microfaunas suggest that lithification of carbonates at Site 768 not only reflects burial diagenesis as described by Garrison (1981) and others, but in part may be a selective, early diagenetic process. The different types and distribution of the dolomite additionally seem to support this assumption.
The purpose of this report is to document the occurrence and textural nature of the dolomite at Site 768. Methods used were analyses of stained thin sections (Alizarin S and Ferrocyanide) and studies with the scanning electron microscope. No geochemical analyses (e.g., stable isotopes) were carried out; they will be the subject of further investigations.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 8.000000 * Longitude: 121.219800
Date/Time Start: 1988-11-28T10:45:00 * Date/Time End: 1988-12-13T07:00:00
Minimum Elevation: -4396.0 m * Maximum Elevation: -4396.0 m
Event(s):
124-768B * Latitude: 8.000000 * Longitude: 121.219800 * Date/Time Start: 1988-11-28T10:45:00 * Date/Time End: 1988-11-28T21:30:00 * Elevation: -4396.0 m * Penetration: 364.1 m * Recovery: 293.79 m * Location: Sulu Sea * Campaign: Leg124 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 364.1 m cored; 0 m drilled; 80.7 % recovery
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: Leg124 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 100 cores; 915 m cored; 0 m drilled; 57.5 % recovery
Comment:
+ = present, - = absent
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Betzler, Christian | DSDP/ODP/IODP sample designation | ||
| 3 | Dolomite | Dol | Betzler, Christian | pore filling (D1) | ||
| 4 | Dolomite | Dol | Betzler, Christian | clouds diss (D2) | ||
| 5 | Dolomite | Dol | Betzler, Christian | rhomboeders (D3) | ||
| 6 | Preservation | Preserv | Betzler, Christian | fossil, ++ = very good, + = good, +- = fair, - = bad. Foraminifers mostly recrystalized or preserved as small voids |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
59 data points
Data
| 1 Event | 2 Sample label | 3 Dol (pore filling (D1)) | 4 Dol (clouds diss (D2)) | 5 Dol (rhomboeders (D3)) | 6 Preserv (fossil, ++ = very good, + = g...) |
|---|---|---|---|---|---|
| 124-768B | 124-768B-23H-1,2-6 | + | - | - | ++ |
| 124-768B | 124-768B-25X-CC,3-5 | + | + | - | - |
| 124-768B | 124-768B-25X-CC,49-51 | - | + | + | +- |
| 124-768B | 124-768B-36X-CC,31-33 | - | - | + | + |
| 124-768C | 124-768C-1R-1,0-4 | - | - | + | + |
| 124-768C | 124-768C-1R-1,59-63 | - | - | + | + |
| 124-768C | 124-768C-2R-1,29-32 | + | + | - | - |
| 124-768C | 124-768C-3R-CC,11-13 | - | - | - | - |
| 124-768C | 124-768C-9R-2,126-128 | - | - | + | - |
| 124-768C | 124-768C-30R-1,141-143 | - | - | + | + |
| 124-768C | 124-768C-33R-6,27-29 | - | - | - | ++ |
| 124-768C | 124-768C-35R-1,23-25 | - | - | - |