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Bertrand, Herve; Boivin, P; Robin, C (1990): Petrology and geochemistry of basalts from the Vavilov Basin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745739, Supplement to: Bertrand, H et al. (1990): Petrology and geochemistry of basalts from the Vavilov Basin (Tyrrhenian Sea), Ocean Drilling Program Leg 107, Holes 651A and 655B. In: Kastens, KA; Mascle, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 107, 75-92, https://doi.org/10.2973/odp.proc.sr.107.142.1990

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Abstract:
During ODP Leg 107, two holes were drilled in the basement of Vavilov Basin, a central oceanic area of the Tyrrhenian sea. Hole 655B is located near the Gortani ridge in off-axis position at the western rim of the basin; Hole 651A is located on a basement swell at the axis of the basin. This paper deals with mineral chemistry, major and trace element geochemistry, and petrogenesis of the basalts recovered in the two holes.
The mineralogy of the basalts is broadly homogeneous, but all of them have suffered important seawater alteration. Their major-element compositions are similar to both normal-mid-ocean-ridge-basalts (N-MORB) and back-arc-basalts (BAB) except for Na2O contents (BAB-like), and K2O which is somewhat enriched in upper unit of Hole 651 A. Their affinity with N-MORB and BAB is confirmed by using immobile trace elements such as Zr, Y, and Nb. However, basalts from the two sites present contrasting geochemical characteristics on spidergrams using incompatible elements. Hole 655B basalts are homogeneous enriched tholeiites, similar to those from DSDP Hole 373 (located on the opposite side of the basin near the eastern rim), and show affinities with enriched MORB (E-MORB). At Hole 651 A, the two basalt units are chemically distinct. One sample recovered in lower unit is rather similar to those from Hole 655B, but basalts from upper unit display calc-alkaline characteristic evidenced by the increase of light-ion-lithophile-element (LILE)/high-field-strength-element (HFSE) ratio, and appearance of a negative Nb-anomaly, making them comparable with orogenic lavas from the adjacent Eolian arc. The observed chemical compositions of the basalts are consistent with a derivation of the magmas from a N-MORB type source progressively contaminated by LILE-enriched fluids released from dehydration of the bordering subducted plate.
Implications for evolution of the Tyrrhenian basin are tentatively proposed taking into consideration geochemical and chronological relationships between basalts from Leg 107 Holes 655B and 651 A, together with data from Leg 42 Site 373 and Vavilov Seamount. These data illustrate back-arc spreading in ensialic basin closely associated with the maturation of the adjacent subduction, followed by the growth of late off-axis central volcano, whereas the active subduction retreats southeastward.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 40.167212 * Median Longitude: 12.629188 * South-bound Latitude: 40.150500 * West-bound Longitude: 12.465500 * North-bound Latitude: 40.188700 * East-bound Longitude: 12.756500
Date/Time Start: 1986-01-11T05:22:00 * Date/Time End: 1986-02-13T13:55:00
Event(s):
107-651A * Latitude: 40.150500 * Longitude: 12.756500 * Date/Time Start: 1986-01-11T05:22:00 * Date/Time End: 1986-01-17T23:00:00 * Elevation: -3578.0 m * Penetration: 550.9 m * Recovery: 185.66 m * Location: Tirreno Sea * Campaign: Leg107 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 58 cores; 550.9 m cored; 0 m drilled; 33.7 % recovery
107-655B * Latitude: 40.188700 * Longitude: 12.465500 * Date/Time Start: 1986-02-10T16:15:00 * Date/Time End: 1986-02-13T13:55:00 * Elevation: -3390.0 m * Penetration: 196.1 m * Recovery: 49.32 m * Location: Tirreno Sea * Campaign: Leg107 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 12 cores; 114.9 m cored; 0 m drilled; 42.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Bertrand, H; Boivin, P; Robin, C (1990): (Table 1) Petrographic characteristics of basalts of ODP Holes 107-651A and 107-655B. https://doi.org/10.1594/PANGAEA.745730
  2. Bertrand, H; Boivin, P; Robin, C (1990): (Table 7) Major elements and CIPW norms of basalts from ODP Holes 107-651A and 107-655B. https://doi.org/10.1594/PANGAEA.745737
  3. Bertrand, H; Boivin, P; Robin, C (1990): (Table 8) Trace elements of basalts from ODP Holes 107-651A and 107-655B. https://doi.org/10.1594/PANGAEA.745738
  4. Bertrand, H; Boivin, P; Robin, C (1990): (Table 5) Geochemistry of biotites from ODP Holes 107-651A. https://doi.org/10.1594/PANGAEA.745735
  5. Bertrand, H; Boivin, P; Robin, C (1990): (Table 3) Geochemistry of clinopyroxenes from ODP Holes 107-651A and 107-655B. https://doi.org/10.1594/PANGAEA.745733
  6. Bertrand, H; Boivin, P; Robin, C (1990): (Table 4) Geochemistry of plagioclase from ODP Holes 107-651A and 107-655B. https://doi.org/10.1594/PANGAEA.745734
  7. Bertrand, H; Boivin, P; Robin, C (1990): (Table 6) Geochemistry of spinels and ilmenite from ODP Holes 107-651A. https://doi.org/10.1594/PANGAEA.745736
  8. Bertrand, H; Boivin, P; Robin, C (1990): (Table 2) Geochemistry of olivines from ODP Hole 107-655B. https://doi.org/10.1594/PANGAEA.745731