Sulfide petrology of basalts at DSDP Holes 69-504B and 69-505B
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
1983
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| _version_ | 1867168563771473920 |
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| author | Distler, V V Pertsev, Nikolay N Boronikhin, V A |
| author_facet | Distler, V V Pertsev, Nikolay N Boronikhin, V A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_816530 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sulfide petrology of basalts at DSDP Holes 69-504B and 69-505B Distler, V V Pertsev, Nikolay N Boronikhin, V A 69-504B; 69-505B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg69; North Pacific/GRABEN 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. |
| title | Sulfide petrology of basalts at DSDP Holes 69-504B and 69-505B |
| topic | 69-504B; 69-505B; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Leg69; North Pacific/GRABEN |
| url | https://doi.org/10.1594/PANGAEA.816530 |