Composition of chromian diopside megacryst in DSDP Leg 37 basalts (Table 2, 3) ...

• Main Authors: Donaldson, Colin H, Brown, Roy W
• Format: Dataset
• Language: English
• Published: PANGAEA 1977
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; Sample code/label; Lithology/composition/facies; Silicon dioxide; Titanium dioxide; Aluminium oxide; ChromiumIII oxide; Iron oxide, Fe2O3; Iron oxide, FeO; Manganese oxide; Magnesium oxide; Calcium oxide; Sodium oxide; Potassium oxide; Magnesium number; Wollastonite; Enstatite; Ferrosilite; Chromium; Drilling/drill rig; DSDP/ODP/IODP sample designation; Leg37; Glomar Challenger; Deep Sea Drilling Project DSDP; Donaldson; Greenland; Pacific
• Online Access: https://dx.doi.org/10.1594/pangaea.708792; https://doi.pangaea.de/10.1594/PANGAEA.708792

Refractory megacrysts of olivine, plagioclase, chromian diopside and Cr-Al spinel, which were not in equilibrium with the host oceanic tholeiite on eruption, are present in samples from several dredge sites and DSDP drill sites in the Atlantic and Pacific Oceans. They have multiple origins: (1) cognate or accidental mantle fragments; (2) relict fragments from fractional crystallization of parental liquids considerably more primitive than oceanic tholeiite; and most commonly (3) the fractional crystallization products of such liquids mixed with oceanic tholeiite magma. Melt inclusions in chrome-spinel phenocrysts provide evidence for this postulated Mg- and Ca-rich magma which has counterparts in the Scottish Tertiary Province and in west Greenland. ... : Supplement to: Donaldson, Colin H; Brown, Roy W (1977): Refractory megacrysts and magnesium-rich melt inclusions within spinel in oceanic tholeiits: indicators of magma mixing and parental magma composition. Earth and Planetary Science Letters, 37(1), 81-89 ...