Two types of secondary sulfides occur on the walls of a vesicle in slightly altered basalt recovered from site 332A of DSDP Leg 37. The first consists of euhedral crystals of pure pyrite, with occasional small partial overgrowths of fibrous chalcopyrite, embedded within smectite (altered glass) which lines the vesicle. The second type occurs as small composite sulfide spherules lightly attached to the surface of the smectite. The spherules are composed of pyrite crystallites arranged in approximate pyritohedral symmetry, with marcasite crystallites decorating the pyritohedron edges. Precession camera photographs and optical studies suggest the marcasite and pyrite grew simultaneously from a pyrite nucleus, with marcasite adopting the pyrite growth habit. These spherules differ sharply from the magmatic sulfide spherules previously described.
This is a preview of subscription content, log in to check access.
Buy single article
Instant access to the full article PDF.
Price includes VAT for USA
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
This is the net price. Taxes to be calculated in checkout.
Brock, K.J., Slater, L.D.: Am. Mineralogist, in press (1977)
Czamanske, G.K., Moore, J.G.: Composition and phase chemistry of sulfide globules in basalt from the Mid-Atlantic Ridge rift valley near 37 ° N lat. Geol. Soc. Am. Bull. 88, 587–599 (1977)
Donnay, J.D.H., Kullerud, G., Donnay, G.: Cross-twinning as a mechanism of phase transition. Trans. Am. Cryst. Assoc. 7, 69–75 (1971)
Fleet, M.E.: Structural aspects of the marcasite-pyrite transformation. Can. Mineralogist 10, 225–231 (1970)
Fleet, M.E.: Structural chemistry of marcasite and pyrite type phases. Z. Krist. 142, 332–346 (1975)
MacLean, W.H.: Sulfides in drill core from Leg 37-Joides. Geol. Mineral. Assoc. Can. Annual Meeting, Abs., 60 (1976)
Mathez, E.A., Yeates, R.S.: Magmatic sulfides in basalt glass from DSDP hole 319A and site 320, Nazca Plate. DSDP XXXIV, pp. 363–373 (1976)
Moore, J.G., Calk, L.: Sulfide spherules in vesicles of dredged pillow basalt. Am. Mineralogist 56, 476–488 (1971)
Moore, J.G., Fabbi, B.F.: An estimate of the juvenile sulfur content of basalt. Contrib. Mineral. Petrol. 33, 118–127 (1971)
Skinner, B.J., Peck, D.L.: An immiscible sulfide melt from Hawaii. Econ. Geol. Mon. 4, 310–322 (1969)
Swanson, H.E., Gilfrich, N.T., Ugrinic, G.M.: Standard X-ray diffraction powder patterns. U.S. Nat. Bur. Stand. Circ. 539, 5, 29 (1955)
About this article
Cite this article
MacRae, N.D., Fleet, M.E. & Andrews, A.J. An occurrence of secondary sulfides from Leg 37 basalts. Contr. Mineral. and Petrol. 63, 309–317 (1977). https://doi.org/10.1007/BF00375578
- Growth Habit
- Optical Study