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Lookout Schist

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Summit area of Lookout Mountain where outcrop of the Cascade River Schist is exposed, including the outcrop shown in Figures 6(a) and 17. View is to the northwest. For regional context, the geology in the distance lies on the western side of the Straight Creek-Fraser River fault (Figures 3 and 6). Mt. Baker, an active Cascade arc volcano, is seen on the left. On the right is snow-covered Mt. Shuksan, underlain by Jurassic ocean floor basalts recrystallized to the blueschist facies.
Published: 10 November 2020
Figure 18 Summit area of Lookout Mountain where outcrop of the Cascade River Schist is exposed, including the outcrop shown in Figures 6 (a) and 17 . View is to the northwest. For regional context, the geology in the distance lies on the western side of the Straight Creek-Fraser River fault
Journal Article
Published: 01 August 1965
American Mineralogist (1965) 50 (7-8): 909–923.
...Eugene B. Gross Abstract In 1956 several unusual uranium deposits were uncovered in the Marshall Pass district, Saguache County, Colorado. Two of the ore bodies occurred in alluvium at an elevation of about 10,000 feet. The largest of these, on the Lookout No. 22 claim, produced about five tons...
Image
Geology of the North Cascades. Sources: (a) [46], (b) [65], (d) [54], (e) [42], (f) [30], (g) [43], (h) [66], (j) [33], (l) [48], (m) [50], (n) [67], (p) [36], (q) [68], (r) [49], (s) [15], (t) [55], and (u) [39]. WPT = Windy Pass thrust; WRSZ = White River Shear Zone; RLFZ = Ross Lake fault zone; GPTB = Gabriel Peak tectonic belt; A = pseudomorphed andalusite. Napeequa Schist: 89f and 90f are zircon ages in small plutons, 125q is a detrital zircon age in the Tonga Formation component of the Nason terrane, and 149izq is a zircon age from volcanic strata interlayered with sedimentary rocks in the Nason terrane (Brown, unpublished data). The Diablo Lake inset is described in the text. Note that the view northwest from Lookout Mountain (LM) is seen in the photograph of Figure 18.
Published: 10 November 2020
 = Windy Pass thrust; WRSZ = White River Shear Zone; RLFZ = Ross Lake fault zone; GPTB = Gabriel Peak tectonic belt; A = pseudomorphed andalusite. Napeequa Schist: 89 f and 90 f are zircon ages in small plutons, 125 q is a detrital zircon age in the Tonga Formation component of the Nason terrane
Journal Article
Published: 01 July 2017
The Journal of Geology (2017) 125 (4): 423–438.
... granodiorite and biotite hornblende tonalite of the Quartz Mountain stock and its cupolas are located in the Manastash inlier, central Cascades, Washington. This stock and its cupolas intrude the low- PT metamorphosed Lookout Mountain Formation turbidites—which are interpreted to have formed in a forearc...
FIGURES
First thumbnail for: Evidence of a Late Jurassic Ridge Subduction Event...
Second thumbnail for: Evidence of a Late Jurassic Ridge Subduction Event...
Third thumbnail for: Evidence of a Late Jurassic Ridge Subduction Event...
Journal Article
Journal: GSA Bulletin
Published: 23 August 2024
GSA Bulletin (2025) 137 (1-2): 740–768.
...-silicate, amphibolite, and quartzite are interlayered with these rocks. The granulitic belt lies structurally below Late Cretaceous tonalites and granodiorites of the San Antonio terrane (termed the Tonalite of San Sevaine Lookout by Morton et al., 2001 ; Figs. 2 and 3K – 3P ). Thermobarometry of lower...
FIGURES
First thumbnail for: Tectonic and magmatic construction of lower crust ...
Second thumbnail for: Tectonic and magmatic construction of lower crust ...
Third thumbnail for: Tectonic and magmatic construction of lower crust ...
Journal Article
Journal: GSA Bulletin
Published: 02 June 2025
GSA Bulletin (2025)
..., 2015). The anatectic granite belt is after Chapman et al. (2021). GF Garlock fault; POR Pelona-Orocopia-Rand schist; MFTB Maria foldthrust belt. Transpressional (dextral) shear zones: Or Orofino; WI Western Idaho; MSL Mojave Snow Lake fault. Sinistral and/or reverse shear zones: C Cucamonga and Black...
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 April 2017
Lithosphere (2017) 9 (2): 265–282.
... similar in mineralogy. They intrude along a ∼50 km corridor between the Burnt River Schist (Baker terrane) and Weatherby Formation (Izee terrane) that is locally subparallel to the southeast-vergent Connor Creek thrust fault ( Fig. 1B ). The two easternmost plutons (Lookout Mountain, Pedro Mountain...
FIGURES
First thumbnail for: Intrusive and depositional constraints on the Cret...
Second thumbnail for: Intrusive and depositional constraints on the Cret...
Third thumbnail for: Intrusive and depositional constraints on the Cret...
Journal Article
Published: 05 October 2007
Canadian Journal of Earth Sciences (2007) 44 (10): 1375–1396.
... Formation and Chiwaukum Schist have been correlated with the lithologically similar Lookout Mountain Formation of Manastash Ridge ( Stout 1964 ), but these rocks are intruded by a 157 Ma pluton ( Miller et al. 1993 ) and are thus significantly older than the 125 Ma detrital zircons of the Tonga...
FIGURES
First thumbnail for: Detrital zircon constraints on terrane ages and af...
Second thumbnail for: Detrital zircon constraints on terrane ages and af...
Third thumbnail for: Detrital zircon constraints on terrane ages and af...
Journal Article
Published: 13 September 2006
Canadian Journal of Earth Sciences (2006) 43 (7): 995–1030.
... between the two is sheared, faulted, and (or) overprinted by a strong S 2 flattening (Fig.  4 ) that obscures the nature of the original contact. In the Sioux Lookout area (Fig.  1 ), the southern contact between upper turbidites of the Little Vermilion formation (Warclub assemblage, this paper) and 2733...
FIGURES
First thumbnail for: Sedimentary and structural evidence for 2.7 Ga con...
Second thumbnail for: Sedimentary and structural evidence for 2.7 Ga con...
Third thumbnail for: Sedimentary and structural evidence for 2.7 Ga con...
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 10 November 2020
Lithosphere (2020) 2020 (1): 8856566.
...Figure 18 Summit area of Lookout Mountain where outcrop of the Cascade River Schist is exposed, including the outcrop shown in Figures 6 (a) and 17 . View is to the northwest. For regional context, the geology in the distance lies on the western side of the Straight Creek-Fraser River fault...
FIGURES
First thumbnail for: Magma Loading in the Southern Coast Plutonic Compl...
Second thumbnail for: Magma Loading in the Southern Coast Plutonic Compl...
Third thumbnail for: Magma Loading in the Southern Coast Plutonic Compl...
Journal Article
Published: 19 July 2006
Canadian Journal of Earth Sciences (2006) 43 (7): 1031–1054.
... bend near Sioux Lookout. To the north, the Miniss River fault is intersected by the east-striking, dextral strike-slip Sydney Lake – Lake St. Joseph fault; the latter merges along strike with the Pashkokogan fault. Restoration of respective displacements indicates that the faults formed sequentially...
FIGURES
First thumbnail for: Structural analysis of the Miniss River and relate...
Second thumbnail for: Structural analysis of the Miniss River and relate...
Third thumbnail for: Structural analysis of the Miniss River and relate...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1925
AAPG Bulletin (1925) 9 (2): 341–343.
.... The texture varies greatly and in some specimens it is almost submicroscopic, but in others it is so coarse that the rock resembles a scricite schist. If the bentonite is derived from a tuff that has not been re-worked, the original tuff structure is often perfectly preserved. Beds of high-grade bentonite...
Journal Article
Journal: AAPG Bulletin
Published: 01 November 1965
AAPG Bulletin (1965) 49 (11): 2076–2119.
..., and southern sides of the basin. A general discussion of the lithologic and mineralogic character, age relations, and distribution of rock types of the Precambrian is given by Fitzsimmons (1963) . The Precambrian basement complex of the basin is mainly quartzite, granite, and mica schist. The few deep...
FIGURES
First thumbnail for: Sedimentary History and Economic Geology of San Ju...
Second thumbnail for: Sedimentary History and Economic Geology of San Ju...
Third thumbnail for: Sedimentary History and Economic Geology of San Ju...
Journal Article
Published: 01 June 1918
Bulletin of the Seismological Society of America (1918) 8 (2-3): 68–73.
... of the territory covered are chiefly crystalline schists, gneisses and granites, but immed!ately adjacent to the dis- turbed belt blocks of Tertiary sedimentaries have been faulted into the crystallines in a most abrupt manner. The dominant structural feature of the region under discussion is the San Jacinto fault...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1979
AAPG Bulletin (1979) 63 (9): 1452–1466.
... of granite, gneiss, schist, gabbro, quartzite, and marble, of Proterozoic and Paleozoic ages. The basement offshore has not been sampled, but by analogy with that of the coastal plain it is inferred to consist of Paleozoic and Proterozoic(?) metamorphic rocks. Basement grabens filled with Triassic arkosic...
FIGURES
First thumbnail for: Stratigraphy and Depositional Environments of Balt...
Second thumbnail for: Stratigraphy and Depositional Environments of Balt...
Third thumbnail for: Stratigraphy and Depositional Environments of Balt...
Journal Article
Published: 01 January 1996
Russ. Geol. Geophys. (1996) 37 (1): 14–28.
... for an amphibolite in the Western Klamath Belt associated with the May Creek Schist [ 21 ]. The radiometric age of the Josephine Ophiolite is 162 Ma and similar ages have been determined on related ophiolites beyond the Western Klamath terrane as klippe at Snow Camp, Marial, and Rum Creek [ 7 ] ( Table 2...
FIGURES
First thumbnail for: THE BRIGGS CREEK AMPHIBOLITE, KLAMATH MOUNTAINS, O...
Second thumbnail for: THE BRIGGS CREEK AMPHIBOLITE, KLAMATH MOUNTAINS, O...
Third thumbnail for: THE BRIGGS CREEK AMPHIBOLITE, KLAMATH MOUNTAINS, O...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1977
AAPG Bulletin (1977) 61 (3): 331–343.
... the spokes on a wheel. Other less spectacular diverging sand swells are present from Cape Romain southward to Cape Canaveral. The Florida-Hatteras slope, the steeply inclined seaward edge of the continental shelf, extends from Cape Lookout to the Florida Keys. The relief ranges from a few meters near...
FIGURES
First thumbnail for: Petroleum Geology and Oil and Gas Potential of Sou...
Second thumbnail for: Petroleum Geology and Oil and Gas Potential of Sou...
Third thumbnail for: Petroleum Geology and Oil and Gas Potential of Sou...
Journal Article
Journal: Geosphere
Published: 05 December 2019
Geosphere (2020) 16 (1): 136–181.
... basalt, radiolarian chert, serpentinite-matrix mélange—and arc-derived rocks of Middle Devonian to Early Jurassic age (e.g., Elkhorn Ridge Argillite and Burnt River Schist; Blome and Nestell, 1991 ; Schwartz et al., 2010 ). Early Permian faunas recovered from the Elkhorn Ridge Argillite support...
FIGURES
First thumbnail for: Orogenic link ∼41°N–46°N: Collisional mountain bui...
Second thumbnail for: Orogenic link ∼41°N–46°N: Collisional mountain bui...
Third thumbnail for: Orogenic link ∼41°N–46°N: Collisional mountain bui...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1973
AAPG Bulletin (1973) 57 (3): 477–497.
... sedimentary and volcanic sequences on Chatham Island ( Figs. 2 , 3 ) unconformably overlie a basement of Permian-Jurassic quartz-feldspathic schist (Chatham Schist) and associated minor metagraywacke and metavolcanic rocks. The Chatham Schist probably correlates in part with the “Axial” or “Alpine” facies...
FIGURES
First thumbnail for: Structure and Petroleum Potential of Eastern Chath...
Second thumbnail for: Structure and Petroleum Potential of Eastern Chath...
Third thumbnail for: Structure and Petroleum Potential of Eastern Chath...
Journal Article
Published: 01 April 2009
The Canadian Mineralogist (2009) 47 (2): 315–336.
... to the 2685 Ma Ghost Lake Batholith. The Taylor 2 pegmatite consists of three separate limbs that intruded a wide zone of chlorite schist near the eastern end of an altered ultramafic sill. Most of the beryl and emerald occurs in a “zone of mixing” between the southern and central limbs of the pegmatite...
FIGURES
First thumbnail for: EMERALD MINERALIZATION ASSOCIATED WITH THE MAVIS L...
Second thumbnail for: EMERALD MINERALIZATION ASSOCIATED WITH THE MAVIS L...
Third thumbnail for: EMERALD MINERALIZATION ASSOCIATED WITH THE MAVIS L...