Unknown
PANGAEA
In:
Supplement to: Distler, V V; Pertsev, Nikolay N; Boronikhin, V A (1983): Sulfide petrology of basalts from Deep Sea Drilling Project Holes 504B and 505B. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 607-617, https://doi.org/10.2973/dsdp.proc.69.134.1983
Publication Date:
2023-06-27
Description:
Primary sulfide mineralization in basalts of the Costa Rica Rift occurs mainly in chrome-spinel-bearing olivine tholeiites. Primary sulfides form both globules, consisting of quenched single-phase solid solutions, and irregular polymineralic segregations of pyrrhotite, chalcopyrite, cubanite, and pentlandite.
Two types of sulfide solid solutions - iron-nickel (Mss) and iron-copper (Iss) - were found among sulfide globules. These types appear to have formed because of sulfide-sulfide liquid immiscibility in the host magmas; as proved by the presence of globules with a distinct phase boundary between Mss and Iss. Such two-phase globules are associated with large olivine phenocrysts. Inhomogeneties among the globule composition likewise are caused by sulfide-sulfide immiscibility.
Secondary sulfides form irregular segregations and veins consisting of pyrite, marcasite, and chalcopyrite.
Keywords:
69-504B; 69-505B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg69; North Pacific/GRABEN
Type:
Dataset
Format:
application/zip, 3 datasets
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