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17 Figure 1. Regional map from Roure and Blanchet (1983), Blake et al. (1982, 1985a), and G. Harper and M. Giaramita (unpublished mapping). Mineral Hill and Saddle Mountain greenstone blocks are blocks in the serpentinite melange underlying the Colebrooke Schist. 4
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28 Figure 3. Terrane map of northwestern California, modified after Figures 2a and 2b in Blake et al. (1985b). 15
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40 Figure 5. Regional map from Roure and Blanchet (1983), Blake et al. (1982, 1985a), and G. Harper and M. Giaramita (unpublished mapping), showing the locations of Colebrooke Schist metasedimentary rock samples and other types of rock samples. Mineral Hill and Saddle Mountain greenstone blocks are blocks in the serpentinite melange underlying the Colebrooke Schist. 27
41 Figure 6. Hand sample of JM-79c, a Colebrooke Schist phyllite. The Colebrooke phyllites are black and very fine grained, with abundant veins. Figure 7. Photomicrograph, under plane polarized light, of metagreywacke sample SM- 49 showing foliation. Quartz (qz) and plagioclase (pl) grains are flattened and chlorite (chl) grains are aligned. 28
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43 Figure 8. Outcrop of coarse-grained Colebrooke semischist with mud rip-up clast (arrow). Depositional features such as this and bedding surfaces were rarely observed, largely because of heavy vegetation and deformation. 30
44 Figure 9. Outcrop photo of metabasalt block on Snowcamp Mountain, showing typical appearance of small Colebrooke meta-igneous blocks. Figure 10. Outcrop of metabasalt sample JM-67 showing preserved pillow structures. 31
45 Figure 11. Photomicrograph, under crossed nicols, of metabasalt sample JM-29 showing foliation. Foliation is evident by flattening of grains and by alignment of chlorite (chl) grains. ti = titanite Figure 12. Outcrop of metabasalt sample JM-86 showing foliation. White lines parallel foliation. Photo from G. Harper (unpublished data). 32
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47 Figure 13. Exposure of a fault on the north side of Snowcamp Mountain between Colebrooke phyllite (black rock on right) and serpentinite (red weathering rock on left). If the serpentinite is part of the Snow Camp terrane, this fault is the Coast Range Fault; however, it is possible that the serpentinite is part of the Colebrooke. The serpentinite appears to have a clastic texture (Figure 14). Foliation in both rock types dips to the east (left side of photo), but is not evident in the phyllite in this photo. 34
48 Figure 14. Sample JM-06b, a probably detrital serpentinite (see Figure 13) This sample has sedimentary texture (note white and green clasts). This sample also has foliation and flattened grains. The sample pictured on bottom was cut parallel to lineation and perpendicular to foliation. 35
49 Figure 15. Hand sample from Colebrooke melange outcrop. This sample has sedimentary texture, as evidenced by the presence of clasts (green material). Clasts also appear to be deformed. 36
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51 Figure 16. Hand sample of the brecciated metatonalite block from the peak of Snowcamp Mountain. Arrows point to metarhyolite dike clasts. pum pumpelleyite (blue-green color) 38
52 Figure 17. Hand sample (A) and photomicrograph (B), under plane polarized light, of metatonalite block showing pelitic matrix. Arrow points to pelitic matrix in hand sample (A), and dark areas are pelitic matrix in photomicrograph (B). 39
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60 Figure 18. Regional map from Roure and Blanchet (1983), Blake et al. (1982, 1985a), and G. Harper and M. Giaramita (unpublished mapping), showing the locations of Colebrooke Schist meta-igneous rock samples. Mineral Hill and Saddle Mountain greenstone blocks are blocks in the serpentinite melange underlying the Colebrooke Schist. 47
61 Figure 19. Photomicrographs, under crossed nicols, showing relict igneous textures. Sample JM-68 (A) is typical of Colebrooke metabasalts. Subophitic texture and relict clinopyroxene (cpx), plagioclase (pl) altered to albite and relict spinel (sp) are visible. SM-13c (B) has trachytic texture, evident by aligned plagioclase (pl) grains. chl - chlorite 48
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63 Figure 20. Photomicrograph, under plane polarized light, of sample JM-66a showing spherulitic texture. pl - plagioclase (pl), chl - chlorite 50
64 Figure 21. Outcrop of metatonalite block with metarhyolite sample JM-200 in place. Arrow points to JM-200 (green). 51
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73 Figure 22. Regional map from Roure and Blanchet (1983), Blake et al. (1982, 1985a), and G. Harper and M. Giaramita (unpublished mapping), showing the locations of analysed Colebrooke Schist meta-igneous rock samples. Mineral Hill and Saddle Mountain greenstone blocks are blocks in the serpentinite melange underlying the Colebrooke Schist. 60
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85 Figure 27. Ocean Ridge Granite normalized spider diagram with modern reference suite and Colebrooke metarhyolite sample JM-200 (yellow circle), modified from Pearce et al. (1984). Low-Ca boninitic rhyolite from Izu-Bonin forearc (sample 61R-4, hole 786B) (Murton et al. 1992), E-ORG (enriched ocean ridge granite) from Mid-Atlantic Ridge, 45N (Pearce et al. and references therein, 1984), backarc basin dacite from central Lau Srpeading Center, Lau Basin (ODP Leg 135) (Hawkins, 1995), SSZ (suprasubduction zone) ophiolite granite from Troodos Massif (Pearce et al. and references therein, 1984). 72
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92 Figure 29. Stereonet projections of F2 fold axes. Plots are divided geographically. Figure from Plake (figure 34b, 1989). Red box indicates overlap with the field area from this study. 79
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99 Figure 33. Illustrations from Davis and Reynolds (figures 9.37 and 9.38, 1996) showing the orientation of foliation in a shear zone. (A) is a cross section of a shear zone and (B) is a block diagram showing the surface trace of foliation as well as a cross section. 86
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101 Figure 34. Stereonet projection of all stretching lineation measurements in the Snowcamp Mountain area. Stereonet generated with the program Stereonett, written by Johannes Duyster of Ruhr-Universitat-Bochum (2000). Value for the Coast Range fault was measured atop Snowcamp Mountain. Red shaded area represents area between measured Coast Range fault value and value calculated from the mapped fault trace 3.5 km north of Snowcamp Mountain. L = linear, P = planar 88
102 Figure 35. Stereonet projection of foliation and lineation measurements in the Snowcamp Mountain area. Only samples with clear shear sense indicators are included. Stereonet generated with the program Stereonett, written by Johannes Duyster of Ruhr- Universitat-Bochum (2000). Value for the Coast Range fault (bold red) was measured atop Snowcamp Mountain. Red shaded area represents area between measured Coast Range fault value and value calculated from the mapped fault trace 3.5 km north of Snowcamp Mountain. L = linear, P = planar 89
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27 Figure 7 Poorly cleaved, massive, light-weathering Bomoseen graywacke outcrop located on Brandon Mountain Road. Figure 8 Photomicrograph of Bomoseen graywacke. Subangular, poorly sorted quartz grains
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