Structure and tectonics of the northern Sierra Nevada

Day, Howard W.; Moores, Eldridge M.; Tuminas, A. C.

doi:10.1130/0016-7606(1985)96<436:satotn>2.0.co;2

Cited by 74 publications

(44 citation statements)

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“…These complexes 'Harwood (1989) and Jayko (1990) have cast doubt on the previous interpretation of some of the folding in these rocks, as outlined by D' Allura et al (1977), Hannah and Moores (1986), Moores and Day (1984), and Day et al (1985). Harwood and Jayko did not take into account much of the indicated evidence for the structures in dispute, particularly within the Shoo Fly complex.…”

Section: Us Cordilleramentioning

confidence: 81%

“…Harwood and Jayko did not take into account much of the indicated evidence for the structures in dispute, particularly within the Shoo Fly complex. form a ~200-Ma ophiolitic sequence, thrust eastward over the Sierran rocks to the east at ~170 Ma and subsequently intruded by dikes and plutonic bodies at ~160 Ma (Day et al, 1985(Day et al, , 1988Beard and Day, 1987;Edelman et al, 1989).…”

Section: Us Cordilleramentioning

confidence: 97%

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Ophiolites, the Sierra Nevada, “Cordilleria,” and Orogeny along the Pacific and Caribbean Margins of North and South America

Moores

1998

International Geology Review

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Section: Us Cordilleramentioning

confidence: 81%

Section: Us Cordilleramentioning

confidence: 97%

Ophiolites, the Sierra Nevada, “Cordilleria,” and Orogeny along the Pacific and Caribbean Margins of North and South America

Moores

1998

International Geology Review

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“…The rocks described in this chapter occur Smartville Complex consists of a carapace of tholeiitic to calcin the contact aureoles of gabbroic plutons in the upper levels of alkalic basalts, andesites, and dacites that is intruded by diabase, the crust of a Jurassic ensimatic arc (Smartville Complex; Beard gabbro, diorite, and tonalite of the arc core (Moores, 1972;Xeand Day, 1987). Although these igneous and metamorphic mixed nophontos and Bond, 1978;Menzies and others, 1980;Day and rocks have the appearance of intrusive breccias, evidence will be others, 1985; Beard and Day, 1987). The oldest rocks in the presented that suggests that they formed by partial melting more Smartville Complex are the volcanic rocks and an intrusive unit or less in situ.…”

Section: Introduction Setting Occurrence and Descriptionmentioning

confidence: 88%

Chapter 17: Partial melting of metabasites in the contact aureoles of gabbroic plutons in the Smartville Complex, Sierra Nevada, California

Beard

1990

Geological Society of America Memoirs

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Metamorphosed volcanic and hypabyssal rocks (metabasites) have been partially melted in the contact aureoles of gabbroic plutons in the Smartville Complex of northernCalifornia. The melting occurred in the upper crust of an active arc at pressures of less than 3 kbar and temperatures that may have exceeded 900 °C. The resultant rocks resemble intrusive breccias and consist of pyroxene hornfels of metamorphic origin and clearly igneous diorite. Coexisting hornfels and diorite appear to be in mineralogical equilibrium. The bulk compositions of the hornfels and of the hornfels-diorite mixed rocks as a whole are depleted in alkalis and silica and enriched in Fe and Mg (restitic) with respect to their inferred greenstone protoliths. The diorite veins and layers in the mixed rocks are unlike any other intrusive rocks in the Smartville Complex in that they have refractory bulk compositions, but evolved mineral compositions. A partial melt origin for the mixed rocks is consistent with their high temperatures of formation, the inferred equilibrium between hornfels and diorite, and the estimated major-element chemistry of the hornfels. The refractory chemistry of the diorite veins and layers and the restitic character of the mixed rocks as a whole suggest that a melt has been extracted from the mixed rocks. Although the mixed rocks physically resemble intrusive breccias, they are by most definitions migmatites. Some Smartville Complex tonalites may be related to melts extracted firom these rocks.

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“…6 and 7;Clark, 1960Clark, , 1964 comprises several steep, sinuous faults, including Melones and Bear Mountain, that generally separate slivers of Jurassic volcanic and sedimentary sections on the west from older tectonic lenses composed of ultramafi c rocks and the Paleozoic Shoo Fly complex on the east (Schweickert and Cowan, 1975;Day et al, 1985;see Edelman et al, 1989b, for additional references). The faults cut rocks as young as Early Kimmeridgian (Clark, 1960).…”

Section: Bear Mountain Melones and Other Steep Faults Of The Foothimentioning

confidence: 96%

Jurassic rocks in Sonora, Mexico: Relations to the Mojave-Sonora megashear and its inferred northwestward extension

Anderson¹,

Rodríguez-Castañeda²,

Silver³

2005

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

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The Mojave-Sonora megashear constitutes a regional boundary between lithologically distinct Jurassic assemblages of different ages. North of the Mojave-Sonora megashear, arc-related volcanic, volcaniclastic, and clastic rocks, intruded by plutons (175-160 Ma) compose part of the Middle Jurassic (commonly ca. 175 Ma) igneous province, previously recognized in Arizona and California. Distinct domains among Jurassic igneous rocks in northern Sonora are: (1) southern Papago, a region where pre-Jurassic rocks are unknown, (2) Nogales-Cananea-Nacozari, where Jurassic rocks are underlain by 1.7-1.4 Ga crystalline basement, and (3) Mojave-Sonora, where strata, including Oxfordian beds, along the north side of the Mojave-Sonora megashear are commonly strongly deformed, as recorded by thrust faults, mylonitic foliation, and recumbent folds. The Mojave-Sonora domain extends across the southwestern margins of the southern Papago and the Nogales-Cananea-Nacozari domains. Strong deformation that distinguishes the zone markedly declines within a few tens of kilometers northward. South of the Mojave-Sonora megashear, in central and southern Sonora, Lower Jurassic clastic and volcaniclastic rocks distinguish the Caborca domain. Upper Jurassic sedimentary rocks, commonly conglomeratic, are abundant north of Mojave-Sonora megashear; a single occurrence is known south of the Mojave-Sonora megashear. Waning of subduction-related Middle Jurassic magmatism was followed by the abrupt formation, ca. 165 Ma, of Coast Range, Josephine, Great Valley, and Devil's Elbow ophiolites and the Smartville Complex within oceanic pull-aparts west of the margin of the North America plate. The formation of ophiolitic rocks signaled the beginning of transtensional faulting. Anderson, T.H., Rodríguez-Castañeda, J.L., and Silver, L.T., 2005, Jurassic rocks in Sonora, Mexico: Relations to the Mojave-Sonora megashear and its inferred northwestward extension, in Anderson, T.H., Nourse, J.A., McKee, J.W., and Steiner, M.B., eds., The Mojave-Sonora megashear hypothesis: Development, assessment, and alternatives: Geological Society of America Special Paper 393, p. 51-95.

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Structure and tectonics of the northern Sierra Nevada

Cited by 74 publications

References 0 publications

Ophiolites, the Sierra Nevada, “Cordilleria,” and Orogeny along the Pacific and Caribbean Margins of North and South America

Ophiolites, the Sierra Nevada, “Cordilleria,” and Orogeny along the Pacific and Caribbean Margins of North and South America

Chapter 17: Partial melting of metabasites in the contact aureoles of gabbroic plutons in the Smartville Complex, Sierra Nevada, California

Jurassic rocks in Sonora, Mexico: Relations to the Mojave-Sonora megashear and its inferred northwestward extension

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