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Broglia, Christina; Schreiber, Charlotte; Cita, Maria Bianca; Mazaud, Alain; Dove, Roy (1990): Grain size distribution and clay mineralogy of upper Miocene sediments of ODP Hole 107-652A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745855, Supplement to: Broglia, C et al. (1990): Mineralogical study of upper Miocene sediments from wireline logs and core measurements, Site 652, Ocean Drilling Program Leg 107 (Tyrrhenian Sea). In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 229-243, https://doi.org/10.2973/odp.proc.sr.107.178.1990

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Abstract:
The upper Miocene sedimentary sequence of Site 652, located on the lower continental margin of eastern Sardinia, was cored and logged during Ocean Drilling Program (ODP) Leg 107. Geophysical and geochemical logs from the interval 170-365 m below seafloor (mbsf), as well as various core measurements (CaCO3, grain size, X-ray diffraction), provide a mineralogical-geochemical picture that is interpreted in the framework of the climatic and tectonic evolution of the western Tyrrhenian.
The results indicate the presence of short- and long-term mineralogical variations. Short-term variations are represented by calcium-carbonate fluctuations in which the amount of CaCO3 is correlated to the grain size of the sediments; coarser sediments are associated with high carbonate content and abundant detrital material. Long-term variation corresponds to a gross grain-size change in the upper part of the sequence, where predominantly fine-grained sediments may indicate a gradual deepening of the lacustrine basin towards the Pliocene. Regional climatic changes and rift-related tectonism are possible causes of this variability in the sedimentation patterns.
The clay association is characterized by chlorite, illite, and smectite as dominant minerals, as well as mixed-layers clays, kaolinite, and palygorskite. Chlorite, mixed-layers clays, and illite increase at the expense of smectite below the pebble zone (335 mbsf). This is indicative of diagenetic processes related to the high geothermal gradient and to the chemistry of the evaporative pore waters, rather than to changes in the depositional environment.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 40.355000 * Longitude: 12.143200
Date/Time Start: 1986-01-18T08:20:00 * Date/Time End: 1986-01-28T21:30:00
Event(s):
107-652A * Latitude: 40.355000 * Longitude: 12.143200 * Date/Time Start: 1986-01-18T08:20:00 * Date/Time End: 1986-01-28T21:30:00 * Elevation: -3446.0 m * Penetration: 721.1 m * Recovery: 445.3 m * Location: Tirreno Sea * Campaign: Leg107 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 75 cores; 721.1 m cored; 0 m drilled; 61.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets

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Datasets listed in this publication series

  1. Broglia, C; Schreiber, C; Cita, MB et al. (1990): (Table 2) CaCO3 and grain size analyses of selected samples at ODP Hole 107-652A. https://doi.org/10.1594/PANGAEA.745853
  2. Broglia, C; Schreiber, C; Cita, MB et al. (1990): (Table 3) Clay mineralogy of selected samples at ODP Hole 107-652A. https://doi.org/10.1594/PANGAEA.745854