G118 0735B001D010000001 1-24 KUE FOLIATED METAGABBRO. Variegated greenish-dark gray to white. No primary layering apparent. Mylonitic zones in Piece 4 (25-30 cm) and Piece 22 (130-135 cm). Foliation defined by granulated pyroxene lenses and by deformed and recrystallized plagioclase; lenses may define a lineation in foliation, but unclear. Dipping 14-45 degree. Plagioclase Clinopyroxene Orthopyroxene Olivine ? ? ? ? < 0.5 mm. Up to 1 cm. Up to 0.5 mm. 1-2 mm. Anhedral porphyroclasts. Anhedral porphyroclasts. Anhedral porphyroclasts. Anhedral porphyroclasts. In foliation. In foliation. In foliation. In foliation. 90%, recrystallized-albite. 60%, neoblasts, amphibole. See comments See comments Mode: 50% originally, 5% now. Mode: 37% originally, 10-20% now. Replacement: 90% oxidized red clay minerals, amphibole. Mode: 10% originally, 5% now. Mode: 3% originally, 0% now. Soft red clay minerals, 100% replaced. 40-95Includes plagioclase and pyroxene neoblasts. First replacement-orthopyroxene or olivine replaced by red clayey pseudomorphs with thin S-shapes in foliation. There are white/green zones cutting the foliation at various angles. See comments. Most as amphibole-filled veins cutting fractured pyroxene grains. Percent vein material: 2%. Texture: There appear to be alteration fronts where a green amphibole has pseudomorphed the pyroxene porphyroclasts and albitic plagioclase has replaced the plagioclase neoblasts (e.g., Pieces 2 and 3). Deformation intensity varies greatly. Pieces 10-12 are coarse-grained and show the least well-developed foliation. The foliation is more marked and the layers finer grained as the rocks are more deformed-section includes mylonitic zones as noted. The amphibolitized zones vary along the core; some clearly post-date deformation, while in other areas the amphibole looks to be deformed as well and may be syndeformational. G118 0735B001D020000001 1-14 KUE FOLIATED METAGABBRO. Variegated greenish-dark gray to white. No primary layering apparent. Well-developed gneissic foliation dipping close to 30 degree in all four oriented samples. Ranges from coarse-grained augen gneiss (Pieces 9-13) at bottom of section to medium-grained gneiss containing 1-4 mm augen of oxidized pyroxene (Pieces 1-8). Pieces 7, 11, and 13: Mylonitic zones. Plagioclase Clinopyroxene Hypersthene Ilmenite 60 33-353-5 2 1-5 mm. 1-5 mm. 0.5-2 mm. Not determined. Anhedral. Anhedral. Anhedral. Anhedral. Not determined. None observed. None observed. See comments 50-90% to sodic plagioclase. 50-90% by amphibole. See comments Not determined. Replacement: 60%. Extensively oxidized to a rust-red or yellow clay mineral and carbonate. Orientation: Occurs as bands and schlieren along foliation. 10-25Extensive zones of albitization occuring concentrically about crosscutting amphibole veins. Sharp contacts between albitized zones and less altered rock. Piece 1: Spectacular plumose texture. Adjacent to amphibole vein (2-5 mm thick), primary pyroxene is altered to amphibole. See comments. Amphibole. Percent vein material: 1%. Texture: And plagioclase to milky albite in a wedge-shaped zone up to 4 cm wide. Many of the pyroxene are rimmed or pseudomorphed by amphibole. Many of the amphibole veins crosscut and crisscross the foliated gneiss, while others appear to have been deformed with the primary minerals and are stretched out along the plane of foliation. G118 0735B002D010000001 1-24 KUE FOLIATED METAGABBRO. Gray with brownish oxidized orthopyroxene. Some phase layering with mafic-rich (not Pieces 7, 8, and 20-22) and mafic-poor portions. Possible modal layering. Layer contacts unclear. Foliation is variable, 15 degree at the top and 65 degree at the bottom, partly mylonitic. Gneissic layering of plagioclase-rich and pyroxene-rich layers. Lineation is clear and is almost parallel to dips of foliation. Grain size: Porphyroclastic clinopyroxene- 1.7 mm across; neoblastic clinopyroxene < 1 mm; orthopyroxene or olivine pseudomorphs - 1 mm; and plagioclase (neoblast) < 1 mm. Porphyroclast/neoblast ratio varies widely (50-95%) showing various degrees of deformation. Pieces 14 and 15: Have weak, vague foliation. Pieces 8 and 10: Are mylonitic with 95% neoblasts. Plagioclase Clinopyroxene Orthopyroxene Olivine 50 ~40 25 > 1 Unknown, now < 1 mm (neoblast). 1.8 cm. < 1 mm. < 1 mm. Unknown, now anhedral. Anhedral. Anhedral. Unknown(now anhedral from deformation). Not evident. Not evident. Not evident. Not evident. Replaced with sodic plagioclase, 70%. 50-95%. Replaced with amphibole. 50-100% see comments 100% see comments Replaced hematite + smectite + calcite aggregate. Replaced by hematite + smectite + calcite aggregate. 50-95Secondary phases appear as neoblast in mylonite matrix. Plagioclase recrystallized into neoblast. Amphibole veins 0.7 mm wide, inclined at 30 degree - perpendicular to the foliation and the lineation. Total percent: 50-90 % neoblasts and up to 20% amphibole. Percent vein material: Not determined. Pieces are classified into four types by textural characteristics: (1) Mylonitic gabbro (Pieces 2, 5, 8, 10, and part of 24). (2) Porphroclastic gabbro (Pieces 3, 4, 6, 7, 9, 11, and part of 24). (3) Well-foliated gabbro (Pieces 1, and 13-17). (4) Gneissic to augen gneissic metagabbro (Pieces 12, and 18-23). G118 0735B002D020000001 1, 6, 10, 12, and 16. KUE PORPHYROCLASTIC METAGABBRO. Greenish gray. Faint magmatic layering, normal to foliation. Foliation defined by flattening of plagioclase and pyroxene to poorly defined gneissic bands. Plagioclase Orthopyroxene Clinopyroxene Ilmenite 55-605-25 15-38< 1 1-20 mm. 1-20 mm. 1-20 mm. 1-20 mm. See comments See comments See comments See comments Plane of foliation. Plane of foliation. Plane of foliation. Plane of foliation. 40%. Replaced by secondary plagioclase. 100%. Iron oxides. 25%. Green amphibole. 100% recrystallized in foliation plane. Shape: Elongated and recrystallized in plane of foliation. Shape: Elongated and recrystallized in plane of foliation. Shape: Elongated and recrystallized in plane of foliation. Shape: Elongated and recrystallized in plane of foliation. 70-20Pseudomorphic. Green amphibole. Percent vein material: 5%. G118 0735B002D020100001 2,3,7,9,11,13,22,and 23 KUE WELL-FOLIATED METAGABBRO. Greenish gray. Faint magmatic layering, normal to foliation. Foliation more distinct. Strongly foliated pyroxene porphyroclasts. Plagioclase Clinopyroxene 68 20 2-12 mm. 2-15 mm. Anhedral. Anhedral. None remains. None remains. 90% with secondary plagioclase. 80%. Largely replaced by green amphibole 70 Pseudomorphic, coronitic. Amphibole. Percent vein material: 25%. G118 0735B002D020300001 4, 5, and 14. KUE MYLONITIC METAGABBRO. Greenish gray. Faint magmatic layering, normal to foliation. Foliation more distinct with discrete mylonitic zones, 1-2 cm thick. Same as well-foliated gabbro. Very elongated in the plane of foliation. Crystal size is < 1 mm in mylonitic zones. 20 Pseudomorphic, coronitic. Carbonate-hematite pseudomorphs of olivine with talc and tremolite. Clays and iron-oxides in fractures. Clays and iron-oxides. Percent vein material: 5%. G118 0735B002D020700001 17-21 KUE POORLY FOLIATED METAGABBRO. Greenish gray. Faint magmatic layering, normal to foliation. Poorly foliated. Plagioclase Orthopyroxene Clinopyroxene 65 10 22 1-20 mm. < 1 mm. 1-4 mm. Idiomorphic. Idiomorphic. Idiomorphic. None observed. None observed. None observed. 80%. 20%. Partially replaced by iron oxides. 50%. Green rims. 36 Coronas around clinopyroxene. N/A Percent vein material: No vein. G118 0735B002D030000001 1-9 KUE FOLIATED METAGABBRO. Greenish gray. None. Foliation variable, 40-70%, defined by stretched plagioclase and clinopyroxene. Plagioclase Clinopyroxene Olivine 50 40 10 < 1-7 mm. < 1-7 mm. Not determined. Anhedral, porphyroclastsand neoblasts. Anhedral, porphyroclasts and neoblasts Not determined. In plane of foliation. In plane of foliation. Not determined. Partly recrystallized. Partly replaced by amphibole. Not determined. 30-50Plagioclase and pyroxenes partly recrystallized. Pyroxenes partly replaced by amphibole. Not determined. Percent vein material: Not determined. G118 0735B003D010000001 1-25 KUE MYLONITIC METAGABBRO(1-6, 8), AUGEN GNEISSIC METAGABBRO(7,9,10), WELL-FOLIATED METAGABBRO(22-25),PORPHYROCLAST METAGABBRAll types variably dark gray-green to white. No primary layering apparent. Mylonitic metagabbro: Pieces 1-6 and 8. Fine-scale alternating layers of pyroxene and plagioclase. Piece 2 has a few lenses of pyroxene and plagioclase augen. Inclination of foliation about 50 degree in Piece 2; amphibolite lenses is same piece slightly S-shaped and slightly offset from main foliation. Augen gneissic metagabbro: Pieces 7,9 & 10. No oriented pieces, but similar to first group with small pyroxene augen. Well-foliated metagabbro:Pieces 22-25. Inclination of foliation about 45 degree in Piece 25. has stretched lens of amphibole with rounder cores of oxidized pyroxene.SEE COMMENTS Plagioclase Pyroxene Olivine 50 45 5(?) 0.5-2 mm. 1-4 mm. See description Anhedral. Anhedral. Not apparent due to alteration. In plane of foliation. Elongate in plane of foliation. Not apparent due to alteration. See description See description See description Replacement: 30-80%. Replaced by more Na-rich plagioclase. Mode:Proportions of clinopyroxene/orthopyroxene are difficult to estimate because of replacement by amphibole, but orthopyroxene probably greater than clinopyroxene. Replacement: 50-90%. Clinopyroxene replaced by amphibole; orthopyroxene by amphibole and orangish iron-oxide. Size: Difficult to estimate because of total alteration. Replacement: 100%. Replaced by dark orange-brown iron-oxide. 50-95Plagioclase replaced by more Na-rich plagioclase, clinopyroxene replaced by amphibole, orthopyroxene replaced by amphibole and orangish iron-oxides, and olivine replaced by orange-brown iron-oxide. Pieces 1,2,5,11,14-16,19,21, and 23-25 contain crosscutting fractures filled by amphibole. Fractures fairly random in orientation and very thin. Percent vein material: 1-2%. Deformation: Porphyroclastic metagabbro: Pieces 13, 14, and 17-21. Foliation near horizontal in Piece 14. Defined by stretched augen of clinopyroxene. G118 0735B003D020000001 1A-3 KUE FOLIATED METAGABBRO (MEDIUM- TO COARSE-GRAINED). Gray. No primary layering apparent. Foliation defined by stretched and elongated lensoidal pyroxene and plagioclase dipping at 30 degree in all three oriented pieces. Plagioclase Clinopyroxene Orthopyroxene Olivine 50 40 7 3 Not determined. Not determined. Not determined. Not determined. Anhedral. Anhedral. Anhedral. Anhedral. Elongated in plane of foliation. Elongate in plane of foliation. Elongate in plane of foliation. Elongate parallel foliation. Extensive albitization. Extensively altered to amphibole. 80% altered to rust-red clay minerals. 100% altered to rust-red clay mineral. N/A Extensive albitization of feldspar (milky) and alteration of pyroxene to amphibole, which forms rims or pseudomorphs around primary pyroxene. All olivine(?) appears to be totally altered to rust-red clay mineral, along with much of the orthopyroxene. Pieces 1 and 2 contain 1-mm-thick amphibole vein nearly at right angles to foliation (inclined 53 degree from horizontal). Piece 3: Contains single, 0.5-mm-thick white carbonate(?) vein lying horizontal. Percent vein material:1%. G118 0735B004D010000001 1-20B KUE FOLIATED TO MYLONITIZED METAGABBRO. Dark gray to white. No primary layering apparent. Piece 17-Mylonitic metagabbro. Pieces 9,10,15, and 16: Intensely deformed but not mylonitic. Consist of small round orthopyroxene, 1-3 mm in size, often rounded in appearance, in very fine-grained matrix of amphibole(?). Pieces 11-13: Poorly foliated, coarse-grained. Remaining pieces: Foliated metagabbro, medium- to fine-grained. Plagioclase Orthopyroxene Clinopyroxene 40-5025-3025-30 0.5-3 mm. 1-4 mm. 1-7 mm. Anhedral. Anhedral. Anhedral. None evident. None evident. None evident. See description See description 75-80% by amphibole. Replacement: 50-100% by milky white plagioclase (albite). Replacement: 100% by amphibole and light orange-brown iron-oxide. > 75 Amphibole replaces clinopyroxene and partially replaces orthopyroxene. Orthopyroxene also replaced by light orange-brown iron-oxide. Plagioclase replaced by milky white plagioclase (albite). Pieces 2-6 and 18-20 have fractures filled by amphibole oblique to foliation. Percent vein material: 2-5%. G118 0735B004D020000001 1-9 KUE FOLIATED AND MYLONITIZED METAGABBRO. Gray, some black. No primary igneous layering. Foliation defined by elongated and stretched pyroxene and plagioclase with orthopyroxene augen often prominent. Pieces 3-9: Heavily mylonitized. Pieces 3 and 9: Have zones of dense black glassy-appearing material containing coarse orthopyroxene augen, which is mylonitized ilmenite gabbro. Plagioclase Clinopyroxene Orthopyroxene Iron oxides 50 40 7 3 < 1-4 mm. 0.5-4 mm. 0.5-5 mm. Not determined. Anhedral. Anhedral. Anhedral. Interstitial, anhedral. Often elongate parallel to foliation. Often elongate parallel to foliation. Often elongate parallel to foliation. None observed. See description 62% by amphibole. 66% oxidized to rust-red clay minerals. 0%. Replacement: replaced by milky albite(sodic plagioclase) 29 Plagioclase extensively altered to milky albite. Pyroxene altered to or rimmed by amphibole. Orthopyroxene oxidized to rust-red clay minerals. Amphibole, occuring in veins up to 3 mm thick. Percent vein material: Not determined. Pieces 1 and 2: Gneissic gabbro. Pieces 3-9: Mylonitized metagabbro. Pieces 3 and 4: Contain mylontic oxide-rich zones. G118 0735B005D010000001 1-7 KUE MYLONITIC METAGABBRO. Gray, dark gray, speckled rust brown. None remaining, if ever present. All pieces profoundly foliated on a very fine scale. Pieces 1-3 and 6: Foliation is more distinct because of mafic/felsic alternation, also easier to see on rounded rather than cut surfaces. Pieces 4 and 7: Especially finely foliated. Pieces 1 and 7: Founded by upper and lower foliation surfaces; all other pieces show foliation inclined to flat surfaces on pieces. Plagioclase Clinopyroxene Orthopyroxene 40-50~40 5 < 2 mm. < 2 mm. < 2 mm. Porphyroclasts and neoblasts. Porphyroclasts and neoblasts. Porphyroclasts and neoblasts. Marks foliation. Marks foliation. Marks foliation. See description 75% by amphibole. See description Replacement: 50% with milky feldspar (probably albite). Total pyroxenes, ~40% (difference between orthopyroxene and clinopyroxene; See thin section description. Mode: See clinopyroxene. Pieces 1 and 6: Small relict orthopyroxene (altered) porphyroclasts (5% of each piece). Replacement: 100% by orange-brown secondary minerals (obviously partly iron-oxides). > 30 Mostly green amphibole after clinopyroxene, and milky feldspar (probably albite) after plagioclase. Orthopyroxene (minor) replaced by orange-brown secondary minerals (obviously partly iron-oxides). Small (<< 1 mm) veins filled with amphibole cut mylonite and fill cracks in plagioiclase. Percent vein material: Not determined. The primary igneous mineralogy is recrystallized during deformation. G118 0735B006D010000001 1-16, and 18 (bottom)-21 KUE FOLIATED METAGABBRO (PARTLY MYLONITIC). Gray to dark gray with reddish brown dots. No primary layering apparent. Foliation defined by fine-grained mylonitic bands and less deformed foliated porphyroclastic bands. Porphyroclasts are clinopyroxene, orthopyroxene, and plagioclase. Pieces 4 and 13: Mylonitic gabbro. Pieces 1-3, 5-12, 14-16, most of 18, 19 (with mylonitic band), 20, and 21:Gneissic to augen gneissic gabbro. Pieces 6,9,12, and 14: Have amphibole vein parallel/subparallel to the foliation. Pieces 17 and 18: Have a dark gray part (metabasalt?). The contacts with foliated gabbro are present at the top of Piece 17 and 1 cm from the top of Piece 18. SEE PRIMARY MINERAL COMMENTS Plagioclase Clinopyroxene Orthopyroxene 55 40 ~5 See description Porphyroclast < 1 cm. Porphyroclasts < 1 cm. Anhedral. Anhedral. Anhedral. No clear preferred orientation. No clear preferred orientation. No clear preferred orientation. Moderate by sodic plagioclase(?). 50-80% by amphibole. See description Size: Mostly neoblast, porphyroclast < 3 mm. Replacement: 100-90% oxidized to reddish mineral (iron oxide). DEFORMATION CONTINUED: The contact in Piece 17 is probably the upper and that in Piece 18 is the lower contact of basalt(?) and gabbro. Piece 3: Contains an isoclinal fold. N/D Plagioclase is altered into white sodic plagioclase, especially in Pieces 3 and 7-9. Clinopyroxene is altered to amphibole. Clinopyroxene porphyroclasts are surrounded by amphibole aggregates. Orthopyroxenes is oxidized to reddish mineral, probably ferric oxyhydroxide + hematite. 2%; Pieces 6, 9, 12 and 14 contain common amphibole veins (or layers). Piece 7: Veins are up to 4 mm thick, cutting foliation at 30 degree. G118 0735B006D011000001 17 and 18(top) KUE MYLONITE. Dark gray. No layering. Foliation is apparent by parallel arrangement of 1 mm long laths (plagioclase(?) or amphibole(?)) and is horizontal at ~20 degree. Too altered to determined. N/D Not determined. N/A Percent vein material:None. Because of extensive metamorphism, the protolith is hard to determine. It is probably microgabbro. Contact of mylonite with adjacent metagabbro is subparallel to foliation. G118 0735B007D010000001 1, 16, and 17 KUE GABBRO. Dark gray. Massive. Minor. Plagioclase Clinopyroxene Olivine Orthopyroxene 55 39 5 1 1-10 mm. 1-20 mm. 0.5-10 mm. 1 mm. Subhedral-euhedral. Anhedral, incipient oikocrysts. Anhedral. Anhedral. None. None. None. None. Fresh. ~5% by amphibole. 10% by tremolite + chlorite. 5% by amphibole. 5-10 Amphibole replacing olivine and pyroxene. Amphibole. Percent vein material: 1%. G118 0735B007D010100001 2-15 KUE FOLIATED METAGABBRO. Gray to dark gray with reddish brown dots. No primary layering. Foliation defined by fine-grained mylonitic bands and less deformed foliated porphyroclastic bands. Porphyroclasts are clinopyroxene, orthopyroxene, and plagioclase. Pieces 2A and 2B: Gneissic metagabbro containing isoclinal holds. Pieces 3, 12, 14, and 15: Porphyroclastic metagabbro. Pieces 4, 5, 9, and 10: Well-foliated metagabbro. Pieces 7 and 8: Poorly-foliated metagabbros. Plagioclase Clinopyroxene Orthopyroxene 55 40 ~5 See description Porphyroclast < 1 cm. Porphyroclast < 1 cm. Anheral. Anhedral. Anhedral. No clear preferred orientation. No clear preferred orientation. No clear preferred orientation. Moderate by sodic plagioclase(?). 50-80% by amphibole. See description Size: Mostly neoblast, porphyroclast < 3 mm. Replacement: 100-90% oxidized to reddish mineral( iorn oxide). N/D Plagioclase is altered into white sodic plagioclase. Clinopyroxene is altered to amphibole. Orthopyroxene is oxidized to reddish mineral. Not determined. Percent vein material: Not determined. G118 0735B007D020000001 1 KUE GABBRO. Dark gray. Massive. Minor. Plagioclase Clinopyroxene Olivine Orthopyroxene 55 39 5 1 1-10 mm. 1-20 mm. 0.5-10 mm. ~1 mm. Subhedral-euhedral. Anhedral, incipient oikocrysts. Anhedral. Anhedral. None. None. None. None. Fresh. ~5% by amphibole. ~10% by tremolite + chlorite. 5% by amphibole. 5-10 Amphibole replacing olivine and pyroxene. Amphibole. Percent vein material: 1%. Gabbro continued from Section 118-735B-7D-1. G118 0735B007D020200001 2-4 KUE PORPHYROCLASTIC METAGABBRO. Gray to dark gray with reddish brown dots. No primary layering. Piece 4: Has mylonitic band. Plagioclase Clinopyroxene Orthopyroxene 55 40 ~5 See description Porphyroclast < 1 cm. Porphyroclast < 1 cm. Anhedral. Anhedral. Anhedral. No clear preferred orientation. No clear preferred orientation. No clear preferred orientation. Moderate by sodic plagiooclase(?). 50-80% by amphibole. See description Size: Mostly neoblast, porphyroclast < 3 mm. 100-90% oxidized to reddish mineral (iron oxide). N/D Plagioclase is altered into white sodic plagioclase. Clinopyroxene is altered to amphibole. Orthopyroxene is oxidized to reddish mineral. Not determined. Percent vein material: Not determined. G118 0735B008D010000001 1, 4, 8, AND 9 KUE PORPHYROCLASTIC METAGABBRO (SEE UNIT 1). Gray. None. Extensive, porphyroclastic textures. Plagioclase Pyroxene Olivine 60 40 8 0.1-5 mm. 0.5-5 mm. 1 mm. Anhedral porphyroclasts. Anhedral. Anhedral. Porphyroclasts aligned in foliation. Porphyroclasts aligned in foliation. None. Not determined. Not determined. See description Replacement: 100% replaced by Fe-oxyhydroxides and clays mostly in Piece 9. Orthopyroxene is the same as olivine. 90 10% pyroxene porphyroclasts, rest is amphibolitized. Plagioclase is albitized. None. Percent vein material: 0%. G118 0735B008D010100001 2, and 5-7. KUE MASSIVE GABBRO. Gray. None. Piece 5-half of piece is strongly foliated metagabbro. Deformation increases downward; grain size decreases in bottom half of piece to poorly foliated gabbro. Clinopyroxene Plagioclase Olivine 55 40 5 Up to 0.5 cm. Up to 0.5 cm. 0.5-2 mm. Anhedral. Anhedral. Anhedral. Weak foliation. None observed. None observed. Minor. Minor. See description Extensively pseudomorphed by clay minerals. The same as orthopyroxene. 8 Orthopyroxene and olivine altered to clay minerals. Some amphibole after clinopyroxene. White, prehnite(?) and albite(?). Size not determined, < 3 mm certainly. Percent vein material: 3%.