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Dmitriev, Yuri I (1982): Composition of minerals at DSDP Leg 67 Holes. PANGAEA, https://doi.org/10.1594/PANGAEA.817493, Supplement to: Dmitriev, YI (1982): Basalts of the Middle America Trench (Guatemala Transect) and their correlation with oceanic and island-arc tholeiites. In: Abouin, J; von Huene, R; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 67, 577-584, https://doi.org/10.2973/dsdp.proc.67.124.1982

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Abstract:
During the Leg 67 drilling of the Middle America Trench (Guatemala transect), basalts were reached in Hole 495, 22 km seaward from the Trench axis, in Holes 500 and 500B at the foot of the continental slope, and at four other holes not sampled for this study. Only olivine-plagioclase phyric basalts are present in Hole 495, whereas in Holes 500 and 500B these rocks are associated with plagioclase phyric high-alumina basalts. As illustrated by the content of TiO2, Al2O3, and the K2O/K2O + Na2O ratio, some of the Middle America Trench basalts do not differ essentially from oceanic tholeiites, but others have a composition transitional to island-arc tholeiitic basalts. It is suggested that basalts transitional from oceanic to island-arc tholeiites are typical manifestations of magmatism in zones of convergence of the oceanic and continental or island-arc crust.
Project(s):
Coverage:
Median Latitude: 12.613874 * Median Longitude: -90.981069 * South-bound Latitude: 12.496300 * West-bound Longitude: -91.037700 * North-bound Latitude: 13.063700 * East-bound Longitude: -90.795200
Date/Time Start: 1979-05-26T00:00:00 * Date/Time End: 1979-06-18T00:00:00
Event(s):
67-495 * Latitude: 12.496300 * Longitude: -91.037700 * Date/Time: 1979-05-26T00:00:00 * Elevation: -4140.0 m * Penetration: 455.5 m * Recovery: 333.7 m * Location: North Pacific/TRENCH * Campaign: Leg67 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 446 m cored; 9.5 m drilled; 74.8 % recovery
67-496 * Latitude: 13.063700 * Longitude: -90.795200 * Date/Time: 1979-05-30T00:00:00 * Elevation: -2049.0 m * Penetration: 378 m * Recovery: 191.9 m * Location: North Pacific/TRENCH * Campaign: Leg67 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 349.5 m cored; 19 m drilled; 54.9 % recovery
67-500 * Latitude: 12.689200 * Longitude: -90.941500 * Date/Time: 1979-06-18T00:00:00 * Elevation: -6094.0 m * Penetration: 165.5 m * Recovery: 73.3 m * Location: North Pacific/TRENCH * Campaign: Leg67 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 156 m cored; 9.5 m drilled; 47 % recovery
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