Structure across a Mesozoic ocean-continent suture zone in the northern Sierra Nevada, California

Edelman, Steven H.; Day, Howard W.; Moores, Eldridge M.; Zigan, Steven M.; Murphy, Thomas P.; Hacker, Bradley R.

doi:10.1130/spe224-p1

Cited by 22 publications

(37 citation statements)

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“…Deeper structural levels include metagabbro cut by sheeted and unsheeted diabase dike swarms, and higher structural levels include lavas and pillow lavas grading upward to volcaniclastic successions, with gabbroic to tonalitic plutons an integral part of the intraoceanic volcanoplutonic complex. The Smartville block structurally overlies deformed arc assemblages of the Slate Creek-Lake Combie belt, which in turn structurally overlies mélanges of the Fiddle Creek-Tuolumne River belt (Day et al, 1985(Day et al, , 1988Edelman and Sharp, 1989;Edelman et al, 1989a;Edelman, 1991;Dilek et al, 1990;Fagan et al, 2001;Day and Bickford, 2004). These structural relationships imply eastward thrusting within the accretionary assemblages west of the Calaveras mélange belt (Ricci et al, 1985).…”

Section: Coast Ranges Quaternary Alluvium Is Blank Small Granitic Bmentioning

confidence: 93%

“…6), and the contact between them represents structural telescoping within a compound arc complex of intraoceanic origin (Sharp, 1988;Dilek, 1989aDilek, , 1989bDilek et al, 1990). The Slate Creek-Lake Combie arc assemblage was constructed on an ophiolitic substratum, with no evidence of continental basement in the arc roots (Edelman, 1990;Edelman et al, 1989aEdelman et al, , 1989bHacker, 1993;Fagan et al, 2001;Day and Bickford, 2004).…”

Section: Coast Ranges Quaternary Alluvium Is Blank Small Granitic Bmentioning

confidence: 99%

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Accretionary Mesozoic–Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon

2008

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The Mesozoic-Cenozoic Cordilleran orogen of California includes multiple accretionary belts incorporated sequentially into the continental margin since Middle Triassic time. Accreted tectonic elements include subduction complexes assembled along the Cordilleran margin, intraoceanic island arcs attached to the continental margin by Jurassic arc-continent collision, and subduction complexes associated with the fl anks of the exotic island arcs. Systematic analysis of areal relations and geochronological data displayed on subregional geologic maps and summary chronostratigraphic diagrams allows the punctuated but quasi-continuous pattern of tectonic accretion to be discerned. Stitching plutons and sedimentary overlap successions constrain the times that successive accretionary belts were juxtaposed and amalgamated into the edge of the continental block. In the Klamath Mountains and Sierra Nevada, a continental-margin magmatic arc of Triassic-Jurassic age includes volcanic and plutonic components built upon and intruded into deformed Paleozoic assemblages that were accreted to the Laurentian margin before Middle Triassic time. The native arc assemblage is separated from intraoceanic Triassic-Jurassic arc assemblages exposed farther west by a compound suture belt of mélange and broken formation derived from the remnant ocean basin that separated the east-facing intraoceanic arc system from the Cordilleran margin. Polarity reversal after Middle to Late Jurassic arc-continent collision was followed by accretion of a disrupted ophiolitic belt forming mafi c basement in the subsurface of the Great Valley forearc basin. Subsequent forearc sedimentation accompanied the assembly of multiple belts of mélange and broken formation that form the Mesozoic-Cenozoic Franciscan subduction complex of the California Coast Ranges.Franciscan subduction was largely coeval with intrusion of the dominantly Cretaceous Sierra Nevada batholith into the roots of the Cordilleran magmatic arc, but Franciscan accretion was just a late phase of continuing tectonic expansion that spanned more than 200 m.y. along the California continental margin.

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Section: Coast Ranges Quaternary Alluvium Is Blank Small Granitic Bmentioning

confidence: 93%

Section: Coast Ranges Quaternary Alluvium Is Blank Small Granitic Bmentioning

confidence: 99%

Accretionary Mesozoic–Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon

2008

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“…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%

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 Rich Bar and Goodyears Creek faults together form the western boundary of the peridotite that is juxtaposed against the Calaveras Complex. Despite the apparent importance of these faults as suggested by their coincidence with contacts of widespread units along strike, Edelman et al (1989b) point out that mapping by Wagner et al (1981) shows that the type Melones fault is continuous with the Dogwood Peak-Gillis Hill faults that lie within the Calveras Complex and associated mélange and ophiolitic rocks. The Gillis Hill fault crosses the Slate Creek thrust without appreciable displacement and therefore must be a relatively minor fault according to Edelman et al (1989b).…”

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

confidence: 92%

“…In the northern Sierra Nevada, the faults that comprise the inferred northward extension of the Melones fault zone (Clark, 1960), including Downieville, Rich Bar, and Goodyears Creek (Fig. 6), do not truncate and displace welldefi ned tectonostratigraphic units (Edelman et al, 1989b, their Fig. 1).…”

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

confidence: 98%

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 across a Mesozoic ocean-continent suture zone in the northern Sierra Nevada, California

Cited by 22 publications

References 0 publications

Accretionary Mesozoic–Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon

Accretionary Mesozoic–Cenozoic expansion of the Cordilleran continental margin in California and adjacent Oregon

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

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

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