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Site 1035 Thin Sections 602 169-1035A-01H-05, 104-105 cm Thin section: # 35 NB: Polished slab ROCK NAME: Sulfide sand ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Total percentage of section: 40 Pyrrhotite 47 0.005-1.0 Subhedral to euhedral, laths or blades. Sphalerite 10 0.01-0.1 Anhedral to subhedral. Some with partly hexagonal morphology. Chalcopyrite 8 0.02-0.05 Anhedral. Mottled or rippled surface, elongate minute grains in sphalerite (0.001-0.005 mm). Isocubanite 2 0.005-0.01 Anhedral. Associated with chalcopyrite. NON-OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Total percentage of section: 20 Silicates 33 ≤ 0.05 Controlled by pyrrhotite network. VOID SIZE SPACE PERCENT (mm) MORPHOLOGY COMMENTS Note: Void space is not considered as part of mineral percentage given above. 40 0.02-0.4 Mainly controlled by pyrrhotite network. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COMMENTS: Dominantly open interlocking network of hexagonal pyrrhotite. Chalcopyrite, sphalerite, and silicates (mainly quartz?) occur interstitial to pyrrhotite crystals. Sphalerite often has inclusions of larger grains of anhedral chalcopyrite with minor isocubanite. Sphalerite also has minute elongated inclusions of crystallographically oriented, as well as occasional small blebs (chalcopyrite disease), of chalcopyrite. Some grains of sphalerite have a partly preserved hexagonal outline, which suggests that the original zinc sulfide was wurtzite. Irregular grains of isocubanite occur in chalcopyrite. No exsolution lamellae are found (maybe too fine for detection in light microscope?). 169-1035C 5X-CC, Piece 6 (42-47 cm) Thin section: #36 ROCK NAME: Vuggy and colloform massive pyrite-marcasite. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Total percentage of section: 95 Marcasite 50 <0.01-0.02 Crystalline, twinned; colloform layers (interlayered with unidentified extremely fine-grained and fibrous gangue), framboids, granoblastic (120° grain boundaries); partly replaced by pyrite. Pyrite 50 <0.01-1 Fine-grained massive; colloform layers (interlayered with unidentified extremely fine-grained and fibrous gangue), framboids, granoblastic (120° grain boundaries); partly replacing the marcasite. NON-OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Anhydrite Trace 0.1 Subhedral. In vugs in pyrite and marcasite. VOID SIZE SPACE PERCENT (mm) MORPHOLOGY COMMENTS Note: Void space is not considered as part of the mineral percentage. Vugs 5 Irregular. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COMMENTS: Recrystallized pyrite and marcasite; colloform in some, and vuggy in other places. Rare anhydrite in vugs. Marcasite occurs predominantly in colloform layers as epitaxial growths on predominantly granoblastic pyrite. 603 169-1035D-2H-1, (95-96 cm) Thin section: # 37 (Polished slab) ROCK NAME: Sulfide sand ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Percentage of section: 10 Pyrrhotite 3 0.005-0.2 Typically euhedral to Partly to totally replaced by pyrite. subhedral and lath-shaped. Pyrite 4 <0.001-0.04 Anhedral to euhedral. Partly replacing pyrrhotite in extremely fine-grained aggregates. Often larger anhedral grains associated with marcasite. Euhedral grains are either pyritohedrons or pseudomorphs after hexagonal pyrrhotite. Sphalerite 2 <0.01-0.07 Anhedral in very Rimmed by chalcopyrite, or in larger grains fine-grained aggregates. sometimes with a hexagonal outline, suggesting that the original zinc sulfide was wurtzite. Chalcopyrite disease is common in larger grains. Other grains have inclusions of pyrite. One grain shows a well developed zonation, from light core to dark rim. Chalcopyrite Trace 0.005-0.04 Anhedral grains. Typical with a mottled surface, occasionally with inclusions of isocubanite. Isocubanite Trace ≤0.01 Inclusions in chalcopyrite, too fine-grained to see any lamellae. Galena Trace ≤0.005 Numerous small inclusions in an aggregate of larger sphalerite crystals. Marcasite 1-2 ≤0.01 In larger aggregates, sometimes twinned, often smaller grains associated with pyrite. NON-OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Percentage of section: 90 Not possible to determine, because of thickness of slab. VOID SIZE SPACE PERCENT (mm) MORPHOLOGY COMMENTS Note: Void space is not considered in mineral percentages given above. 5 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COMMENTS: Weak impregnation of various sulfides in random orientation, suggesting a clastic origin, though no oxidation can be seen in any of the sulfide grains. 169-1035D-9X-1, Piece 2B (25-30 cm) Thin section: # 38 ROCK NAME: Clastic sulfide. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Percentage of section: 70 Pyrite 42 <0.001-0.02 Anhedral. Extremely fine-grained colloform with dark bands (clay?) and, in more coarse-grained aggregates, forming pseudomorphs after elongate pyrrhotite grains. A few small subhedral to euhedral cubes, Sphalerite 14 0.005-0.5 Anhedral to subhedral. sometimes with equant faces. Chalcopyrite disease, mainly following crystallographic directions in the sphalerite. Chalcopyrite 7 0.02-0.1 Lamellar intergrowth. Exsolution, less isocubanite than chalcopyrite. + Isocubanite Pyrrhotite (?) 7 <0.0005- Anhedral aggregates. Intergrown with dark material (clay?). Could also be 0.002 very fine-grained pyrite. NON-OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Percentage of section: 30 Sericite 15 0.01-0.05 Fibrous, felty mass. Typically radiating out from the sulfides. Quartz 6 0.02-0.1 Aggregates of anhedral grains between sulfides. Anhydrite 6 0.1-0.7 Equant grains. Controlled by sulfide morphology. Barite 3 0.1-0.5 Equant grains. Controlled by sulfide morphology. VOID SIZE SPACE PERCENT (mm) MORPHOLOGY COMMENTS Note: Void space is not considered in the mineral percentage given above. 25-30 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COMMENTS: Pyrite forms partly an open interlocking network texture with interstitial chalcopyrite, sphalerite, silicates and sulfates, obviously replacing earlier formed network of coarse grained pyrrhotite. Pyrite also occur in colloform banding with dark material (clay?), maybe together with minor pyrrhotite. 604 169-1035D-10X-1, Piece 15 (80-84 cm) Thin section: # 39 (polished slab) ROCK NAME: Massive sulfide with sediment ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Percentage of section: 60 Pyrite 43.8 0.05-3.0 Euhedral, Lath-shaped as pseudomorphs. and ≤0.002 Anhedral Extremely fine-grained in intergrowth with dark material (clay?) and magnetite. Magnetite 9 0.05-0.1 Anhedral to euhedral. Lath-shaped as pseudomorphs. Extremely and ≤0.002 fine-grained in intergrowth with dark material (clay?) and pyrite. Chalcopyrite + 6 0.02-0.2 Anhedral. Extremely fine-grained in intergrowth, but color suggests less isocubanite than chalcopyrite. Isocubanite Sphalerite 1.2 0.02-0.05 Anhedral grains. Pyrrhotite Trace Very few inclusions in pyrite NON-OPAQUE SIZE MINERALOGY PERCENT (mm) MORPHOLOGY COMMENTS Percentage of section: 40 Anhydrite Can be detected from crystal shapes, otherwise unknown, because of thickness of slab. Quartz Can be detected from crystal shapes, otherwise unknown, because of thickness of slab. VOID SIZE SPACE PERCENT (mm) MORPHOLOGY COMMENTS 0 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ COMMENTS: Mainly an interlocking, open network of pyrite laths and minor magnetite laths with interstitial chalcopyrite, magnetite, and silicates. Both pyrite and magnetite can be seen replacing anhydrite, probably also earlier formed pyrrhotite has been replaced. Locally, patches with interlocking network of magnetite can be seen with interstitial sphalerite.
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