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Sugarloaf fault zone

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Journal Article

Seismic Source Characterization for Greater Phoenix Area Earthquake Hazard

SIMON T. GHANAT, EDWARD KAVAZANJIAN, JR., RAMON ARROWSMITH
Published: 01 August 2015
Environmental & Engineering Geoscience (2015) 21 (3): 211–222.
DOI: https://doi.org/10.2113/gseegeosci.21.3.211
... of the Horseshoe Fault Zone is approximately 20 km and it shows Holocene activity. The length of the Sugarloaf Fault is only about 9 km and it reveals late Quaternary activity. The length of the Verde Fault Zone is 10 km and this fault indicates late Quaternary activity. The Cottonwood Fault Zone displays middle...
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Journal Article

Petrogenesis of the Sugarloaf syenite, Pikes Peak batholith, Colorado

Rachel Beane, Reinhard A. Wobus
Published: 01 January 1999
Rocky Mountain Geology (1999) 34 (2): 313–324.
DOI: https://doi.org/10.2113/34.2.313
... is the predominant rock type in the batholith. The linear arrangement of six of the seven sodic plutons parallel to major Precambrian fault trends suggests that the emplacement of Sugarloaf pluton may be rift-related. The Sugarloaf syenites have high total alkalis, high FeO (total), low CaO, and low MgO...
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Petrology of the Mount Whitney Intrusive Suite, eastern Sierra Nevada, California: Implications for the emplacement and differentiation of composite felsic intrusions

William H. Hirt
Journal: GSA Bulletin
Published: 01 September 2007
GSA Bulletin (2007) 119 (9-10): 1185–1200.
DOI: https://doi.org/10.1130/B26054.1
... at a depth of ∼10 km after initially rising along fractures developed at an extensional stepover between the proto–Kern Canyon fault and the Sierra Crest shear zone. Cenozoic uplift and erosion have exposed the interior of the suite, making it possible to study textural and compositional variations within...
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Geology and geochemistry of volcanic centers within the eastern half of the Sonoma volcanic field, northern San Francisco Bay region, California

Donald S. Sweetkind, James J. Rytuba, Victoria E. Langenheim, Robert J. Fleck
Journal: Geosphere
Published: 01 June 2011
Geosphere (2011) 7 (3): 629–657.
DOI: https://doi.org/10.1130/GES00625.1
... across the West Napa-Carneros fault zones since ∼5 Ma. The volcanic fields in the California Coast Ranges north of San Francisco Bay are temporally and spatially associated with the northward migration of the Mendocino triple junction and the transition from subduction and associated arc volcanism...
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Journal Article

Laurentian and Amazonian sediment sources to Neoproterozoic–lower Paleozoic Maryland Piedmont rocks

Aaron J. Martin, Scott Southworth, Jennifer C. Collins, Steven W. Fisher, Edward R. Kingman, III
Journal: Geosphere
Published: 01 August 2015
Geosphere (2015) 11 (4): 1042–1061.
DOI: https://doi.org/10.1130/GES01140.1
... of the study area showing sample locations. Symbols for geologic time periods denote age of crystallization for intrusive rocks or deposition for supracrustal rocks. Sugarloaf MA—Sugarloaf Mountain anticlinorium. VA—Virginia. The Piedmont Province consists of a collection of fault-bounded terranes...
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Geology, geochronology, and paleogeography of the southern Sonoma volcanic field and adjacent areas, northern San Francisco Bay region, California

David L. Wagner, George J. Saucedo, Kevin B. Clahan, Robert J. Fleck, Victoria E. Langenheim, Robert J. McLaughlin, Andrei M. Sarna-Wojcicki, James R. Allen, Alan L. Deino
Journal: Geosphere
Published: 01 June 2011
Geosphere (2011) 7 (3): 658–683.
DOI: https://doi.org/10.1130/GES00626.1
... and Petaluma basins (Liniecki-Laporte and Andersen, 1988; Allen, 2003 ; Peterson and Allen, 2005 ; Starratt et al., 2005 ) to fully marine conditions west of the Petaluma basin ( Powell et al., 2004 ). Major Neogene right-lateral faults north of San Pablo Bay are extensions of the East Bay fault zone...
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Geochronologic evidence of upper-crustal in situ differentiation: Silicic magmatism at the Organ caldera complex, New Mexico

Matthew J. Zimmerer, William C. McIntosh
Journal: Geosphere
Published: 01 February 2013
Geosphere (2013) 9 (1): 155–169.
DOI: https://doi.org/10.1130/GES00841.1
... the eruption of the Cueva Tuff and each subsequent caldera collapse event probably occurred along existing, structurally weakened, caldera margin faults, producing a nested caldera complex. The intracaldera ignimbrite sequence, as a whole, is zoned from a crystal-poor, high-SiO 2 rhyolite at the base (i.e...
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40 Ar/ 39 Ar dating of Silurian and Late Devonian cleavages in lower greenschist-facies rocks in the Westminster terrane, Maryland, USA

R.P. Wintsch, M.J. Kunk, B.K. Mulvey, C.S. Southworth
Journal: GSA Bulletin
Published: 01 May 2010
GSA Bulletin (2010) 122 (5-6): 658–677.
DOI: https://doi.org/10.1130/B30030.1
..., newly identified Parrs Ridge fault zone. We propose that the sinistral transpressive collision of the Carolina terrane with Laurentia emplaced the western portion of the Westminster terrane in the Pennsylvania embayment along the Martic fault where it was folded and cleaved at ca. 430 Ma but otherwise...
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Dating of Pliocene Colorado River sediments: Implications for cosmogenic burial dating and the evolution of the lower Colorado River

Ari Matmon, Greg M. Stock, Darryl E. Granger, Keith A. Howard
Journal: GSA Bulletin
Published: 01 March 2012
GSA Bulletin (2012) 124 (3-4): 626–640.
DOI: https://doi.org/10.1130/B30453.1
... in a rollover fold along the Wheeler fault suggests that the section records an original incision across the fault in the Colorado Plateau to a depth on the order of 300 m above the historic river ( Howard et al., 2008 ). Figure 2. (A) Stratigraphic relations at Sandy Point site near eastern Lake Mead...
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Geophysical framework of the northern San Francisco Bay region, California

V.E. Langenheim, R.W. Graymer, R.C. Jachens, R.J. McLaughlin, D.L. Wagner, D.S. Sweetkind
Journal: Geosphere
Published: 01 October 2010
Geosphere (2010) 6 (5): 594–620.
DOI: https://doi.org/10.1130/GES00510.1
... fault zone (including the Pilarcitos fault; Fig. 1 ) that transects the San Francisco Peninsula has ∼130 km of offset ( Jachens et al., 1998 ), whereas the East Bay fault system has a well-documented displacement of 160–175 km ( McLaughlin et al., 1996 ; Jachens et al., 1998 ; Graymer et al., 2002...
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Landslide Preconditions and Collapse of the San Francisco Mountain Composite Volcano, Arizona, into Cold Debris Avalanches in Late Pleistocene

Richard F. Holm
Published: 01 May 2004
The Journal of Geology (2004) 112 (3): 335–348.
DOI: https://doi.org/10.1086/382763
... fan can be located in the lavas and pyroclastic deposits exposed in the valley above the fan (Updike 1977 ). Figure 2. Map showing general geology of San Francisco Mountain, adjacent parts of the San Francisco volcanic field, and faults in the vicinity of the central volcano. The cryptodome...
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Tertiary extension in the central British Columbia Intermontane Belt: magnetic and paleomagnetic evidence from the Endako region

Carmel Lowe, Randolph J. Enkin, Lambertus C. Struik
Published: 01 May 2001
Canadian Journal of Earth Sciences (2001) 38 (4): 657–678.
DOI: https://doi.org/10.1139/e00-070
...-slip displacement on this dominantly dextral strike-slip fault. Mapped northeast- and northwest-trending faults commonly correspond to linear zones of steep magnetic gradient and near-surface magnetic sources. Several additional northwest- and northeast-trending lineaments are imaged in the magnetic...
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Journal Article

KATIAN (ORDOVICIAN) RADIOLARIANS FROM THE MALONGULLI FORMATION, NEW SOUTH WALES, AUSTRALIA, A REEXAMINATION

PAULA J. NOBLE, BARRY D. WEBBY
Published: 01 July 2009
Journal of Paleontology (2009) 83 (4): 548–561.
DOI: https://doi.org/10.1666/08-179R.1
... of the formation and fall within one conodont zone, the O. velicuspis Zone. The stratigraphic position of the limestone at the Sugarloaf Creek locality is higher, possibly as high as lower Bolindian, based on proximity to the top of the formation where Bolindian graptolites have been recovered. Despite...
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Journal Article

Heart Mountain and South Fork Detachment Thrusts of Wyoming

William G. Pierce
Journal: AAPG Bulletin
Published: 01 April 1957
AAPG Bulletin (1957) 41 (4): 591–626.
DOI: https://doi.org/10.1306/0BDA5840-16BD-11D7-8645000102C1865D
.... Furthermore, there is no known surface fault or fault zone within or adjoining the region from which the thrust sheet could have been derived, although the possibility can not be eliminated that such a zone exists but is entirely concealed by the volcanic rocks in the Absaroka region. 1 Publication...
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Regional geochemical and isotopic variations of northern New England plutons: Implications for magma sources and for Grenville and Avalon basement-terrane boundaries

Michael J. Dorais, Matthew L. Paige
Journal: GSA Bulletin
Published: 01 June 2000
GSA Bulletin (2000) 112 (6): 900–914.
DOI: https://doi.org/10.1130/0016-7606(2000)112<900:RGAIVO>2.0.CO;2
.... , and Beland , J. , eds., Major structural zones and faults of the Northern Appalachians : Geological Association of Canada Special Paper 24, p. 43 - 66 . Lyons , J.B. , Bothner , W.A. , Moench , R.H. , and Thompson , J.B. , Jr , 1997 , Bedrock geologic map of New Hampshire...
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Rock Quality, Seismic Velocity, Attenuation, and Anisotropy

Jeffrey R. Keaton
Published: 01 February 2009
Environmental & Engineering Geoscience (2009) 15 (1): 50–52.
DOI: https://doi.org/10.2113/gseegeosci.15.1.50
.... Barton notes that his Q-system ( Q rock ) has six orders of magnitude (0.001 to 1000) to describe rock mass quality. It predicts deformation modulus over two to three orders of magnitude. Completely unjointed, massive rock masses, such as the famous Sugarloaf at Rio de Janeiro, have Q rock ≈ 1,000...
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Geology and Water Resources of Southern Okinawa

D. J. Cederstrom
Journal: AAPG Bulletin
Published: 01 October 1947
AAPG Bulletin (1947) 31 (10): 1752–1783.
DOI: https://doi.org/10.1306/3D933A4F-16B1-11D7-8645000102C1865D
... the later gentle folding the schist ridge acted as a barrier to movement of the sedimentary rock cover, thus initiating a major zone of weakness trending southeastward. In view of the lack of key beds, no displacement along the inferred fault in the vicinity of Inubi can be demonstrated. However, the upper...
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Attenuation structure of Coso geothermal area, California, from wave pulse widths

Huatao Wu, Jonathan M. Lees
Published: 01 October 1996
Bulletin of the Seismological Society of America (1996) 86 (5): 1574–1590.
DOI: https://doi.org/10.1785/BSSA0860051574
... values range from 1.16 to 23 HFU (1 HFU = 41.87 roW/m2). High heat flow at the surface (<35 m in depth) aligns well with local faults, indicating convection along fault fracture zones (Combs, 1980). The largest observed heat flow occurs around Sugarloaf mountain (Fig. 14), one of the most recent rhyolite...
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Book Chapter

Central Appalachian Piedmont and Blue Ridge tectonic transect, Potomac River corridor

Author(s)
Scott Southworth, Avery Ala Drake, Jr., David K. Brezinski, Robert P. Wintsch, Michael J. Kunk, John N. Aleinikoff, Charles W. Naeser, Nancy D. Naeser
Book: Excursions in Geology and History: Field Trips in the Middle Atlantic States
Publisher: The Geological Society of America
Published: 01 January 2006
DOI: 10.1130/2006.fld008(08)
EISBN: 9780813756080
... shear zone. 2-2 Martic fault. 2-3 Sugarloaf Mountain anticlinorium, a tectonic window through the Martic thrust sheet. 2-4 Lunch 2-5 Folds on the west limb of the Blue Ridge-South Mountain anticlinorium. 2-6 Short Hill–South Mountain fault, the boundary between the Blue Ridge...
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Abstract This field trip highlights the current understanding of the tectonic assemblage of the rocks of the Central Appalachians, which include the Coastal Plain, Piedmont, and Blue Ridge provinces. The age and origin of the rocks, the timing of regional deformation and metamorphism, and the significance of the major faults, provide the framework of the tectonic history which includes the Mesoproterozoic Grenvillian, Ordovician Taconian, Devonian to Mississippian Neoacadian, and Mississippian to Permian Alleghanian orogenies.

Journal Article

A review of the Pikes Peak batholith, Front Range, central Colorado : A “type example” of A-type granitic magmatism

Diane R. Smith, Jeff Noblett, Reinhard A. Wobus, Dan Unruh, Kevin R. Chamberlain
Published: 01 January 1999
Rocky Mountain Geology (1999) 34 (2): 289–312.
DOI: https://doi.org/10.2113/34.2.289
..., 1980a ; Fig. 2 ). On its north, south, and west margins, it intrudes older granites and metamorphic rocks and is faulted on the eastern margin by the Ute Pass and Rampart fault zones. On the basis of a pronounced negative magnetic expression ( Zietz and Kirby, 1972 ) and a continuous magnetic low...
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