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Kelts, Kerry; McKenzie, Judith A (1982): Diagenetic dolomite formation in Quaternary anoxic diatomaceous muds at DSDP Leg 64 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.818339, Supplement to: Kelts, K; McKenzie, JA (1982): Diagenetic dolomite formation in Quaternary anoxic diatomaceous muds of Deep Sea Drilling Project Leg 64, Gulf of California. In: Curray, JR; Moore, DG; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 64, 553-569, https://doi.org/10.2973/dsdp.proc.64.110.1982

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Abstract:
During drilling in the Gulf of California, diagenetic carbonate rocks were recovered at 7 out of 8 sites. These are primarily dolomites which record 13C isotopic evidence of the incorporation of carbon derived from the decomposition of organic matter. In Hole 479, drilled to a sub-bottom depth of 440 meters on the Guaymas Slope, under a fertile upwelling belt, we recognized an excellent example of deep sea dolomitization in progress. This Quaternary section of organic-carbon- rich, low-carbonate, hemipelagic diatomaceous oozes contains numerous fine-grained, decimeter-thin, episodic beds of dolomite, which show sedimentologic, geochemical, and isotopic evidence of accretion by precipitation below 40 meters sub-bottom in zones of high alkalinity and low sulfate. The beds preserve original sedimentary structures. Carbon-13 varies from +3 to +14 per mil, indicating biogenic CO2 reservoirs related to active methanogenesis. In single beds, 18O values range outwardly from +5 to –7 per mil, reflecting increasing temperature with progressive accretion of dolomite with depth; the values parallel progressive trends in lithification, texture, mineralogy, and fossil preservation. We estimate slow accretion rates on the order of 0.1-0.7 mm/10**3 yr. with burial. Dolomitization does not proceed merely at the expense of nearby nannofossils. Ca and Mg ions must be derived from interstitial waters. The episodic appearance of beds in the sequence seems partly a reflection of latent climate signals. This process of deep sea dolomitization carries implications for hydrocarbon migration, as well as an interpretation of the presence of dolomite in other modern and ancient pelagic to hemipelagic sediment sequences.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 27.120519 * Median Longitude: -111.303996 * South-bound Latitude: 23.050500 * West-bound Longitude: -111.655700 * North-bound Latitude: 27.901700 * East-bound Longitude: -109.053200
Date/Time Start: 1978-12-10T00:00:00 * Date/Time End: 1978-12-31T00:00:00
Event(s):
64-475 * Latitude: 23.050500 * Longitude: -109.053200 * Date/Time: 1978-12-10T00:00:00 * Elevation: -2631.0 m * Penetration: 196 m * Recovery: 127.8 m * Location: North Pacific/Gulf of California/SLOPE * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 196 m cored; 0 m drilled; 65.2 % recovery
64-477 * Latitude: 27.030800 * Longitude: -111.400300 * Date/Time: 1978-12-18T00:00:00 * Elevation: -2003.0 m * Penetration: 191 m * Recovery: 50.6 m * Location: North Pacific/Gulf of California/BASIN * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 21 cores; 172 m cored; 19 m drilled; 29.4 % recovery
64-478 * Latitude: 27.096800 * Longitude: -111.507500 * Date/Time: 1978-12-24T00:00:00 * Elevation: -1889.0 m * Penetration: 464 m * Recovery: 297.6 m * Location: North Pacific/Gulf of California/CHANNEL * Campaign: Leg64 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 49 cores; 427 m cored; 24 m drilled; 69.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Kelts, K; McKenzie, JA (1982): (Table 3) Geochemistry of dolomite samples at DSDP Holes 64-479 and 64-478. https://doi.org/10.1594/PANGAEA.818336
  2. Kelts, K; McKenzie, JA (1982): (Table 4) Calculated versus measured oxygen isotope values for diagenetic dolomite at DSDP Hole 64-479. https://doi.org/10.1594/PANGAEA.818338
  3. Kelts, K; McKenzie, JA (1982): (Table 1) Carbon and oxygen isotopes correlated with lithology and bulk carbonate mineralogy at DSDP Leg 64 Holes. https://doi.org/10.1594/PANGAEA.818334
  4. Kelts, K; McKenzie, JA (1982): (Table 2) Total carbon at DSDP Leg 64 Holes. https://doi.org/10.1594/PANGAEA.818335