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Duggen, Svend; Hoernle, Kaj; Klügel, Andreas; Geldmacher, Jörg; Thirlwall, Matthew F; Hauff, Folkmar; Lowry, David; Oates, N (2008): Geochemistry of Miocene Alborán Basin volcanism. PANGAEA, https://doi.org/10.1594/PANGAEA.772939, Supplement to: Duggen, S et al. (2008): Geochemical zonation of the Miocene Alborán Basin volcanism (westernmost Mediterranean): geodynamic implications. Contributions to Mineralogy and Petrology, 156(5), 557-593, https://doi.org/10.1007/s00410-008-0302-4

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Abstract:
We present new major and trace element and O-Sr-Nd-isotope data for igneous rocks from the western Mediterranean Alborán Sea, collected during the METEOR 51/1 cruise, and for high-grade schists and gneisses from the continental Alborán basement, drilled during the Ocean Drilling Programme (ODP Leg 161, Site 976). The geochemical data allow a detailed examination of crustal and mantle processes involved in the petrogenesis of the lavas and for the first time reveal a zonation of the Miocene Alborán Sea volcanism: (1) a keel-shaped area of LREE-depleted (mainly tholeiitic series) lavas in the central Alborán Sea, generated by high degrees of partial melting of a depleted mantle source and involving hydrous fluids from subducted marine sediments, that is surrounded by (2) a horseshoe-shaped zone with LREE-enriched (mainly calc-alkaline series) lavas subparallel to the arcuate Betic-Gibraltar-Rif mountain belt. We propose that the geochemical zonation of the Miocene Alborán Basin volcanism results from eastward subduction of Tethys oceanic lithosphere coupled with increasing lithospheric thickness between the central Alborán Sea and the continental margins of Iberia and Africa.
Project(s):
Coverage:
Median Latitude: 24.913384 * Median Longitude: 8.224070 * South-bound Latitude: -3.036700 * West-bound Longitude: -4.312780 * North-bound Latitude: 36.747500 * East-bound Longitude: 35.941500
Date/Time Start: 1995-05-21T09:00:00 * Date/Time End: 2001-10-13T00:00:00
Event(s):
161-976B * Latitude: 36.205300 * Longitude: -4.312780 * Date/Time Start: 1995-05-21T09:00:00 * Date/Time End: 1995-06-01T12:45:00 * Elevation: -1108.0 m * Penetration: 928.7 m * Recovery: 535.54 m * Location: Alboran Sea * Campaign: Leg161 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 106 cores; 928.7 m cored; 0 m drilled; 57.7 % recovery
161-976E * Latitude: 36.205300 * Longitude: -4.312500 * Date/Time Start: 1995-06-03T16:45:00 * Date/Time End: 1995-06-08T08:00:00 * Elevation: -1108.0 m * Penetration: 736.3 m * Recovery: 64.85 m * Location: Alboran Sea * Campaign: Leg161 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 192.5 m cored; 0 m drilled; 33.7 % recovery
M51/1_462DR (462) * Latitude Start: 35.843667 * Longitude Start: -4.213333 * Latitude End: 35.846000 * Longitude End: -4.211667 * Date/Time: 2001-10-06T00:00:00 * Elevation Start: -1312.0 m * Elevation End: -1130.0 m * Location: Ibn Batouta Western Seamount * Campaign: M51/1 * Basis: Meteor (1986) * Device: Dredge, chain bag (DRG_C)
Size:
7 datasets

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