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Hylas Zone

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Series: GSA Special Papers
Published: 01 January 1992
DOI: 10.1130/SPE271-p17
... Shear zones and bedrock units as thin as 3 to 4 m in width can be detected using radon and equivalent uranium (eU) concentrations in soils overlying the Hylas zone area, Virginia. Soil radon concentrations in the area range from 144 to 12,081 pCi/L, with distinct contrasts in concentrations...
Journal Article
Journal: GSA Bulletin
Published: 01 August 1979
GSA Bulletin (1979) 90 (8): 739–752.
...ANDY R. BOBYARCHICK; LYNN GLOVER, III Abstract Structural and petrographic studies of the Hylas zone northwest of Richmond, Virginia, reveal that late Paleozoic ductile shearing produced mylonites and ultramylonites from pre-existing biotite gneiss, granite gneiss, and amphibolite in the Goochland...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1985
AAPG Bulletin (1985) 69 (9): 1449–1450.
... to the initial opening of the North Atlantic Ocean. Both are westward tilted half grabens whose border faults share a reactivated Paleozoic basement thrust (the Hylas zone). A dipmeter log from the Bailey 1 well (Richmond basin) shows that bedding dips toward the border fault and increases with depth...
Series: GSA Field Guide
Published: 01 January 2017
DOI: 10.1130/2017.0047(06)
EISBN: 9780813756479
... experienced right lateral transpressional deformation associated with movement on the Hylas fault zone during the Alleghanian orogeny; this was followed by normal faulting and exhumation during the development of the Triassic Richmond basin. Much of the batholith was buried by a thin veneer of primarily...
FIGURES | View All (7)
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1985
AAPG Bulletin (1985) 69 (9): 1440.
... the interpretation that they represent the surface expressions of boundaries of subsurface structural domains. The basin is bounded on the west by the northeast-trending Hylas fault zone, and the eastern margin is cut by 60°-70° northeast-trending lineament zones that segment the basin into discrete blocks. Numerous...
Journal Article
Journal: GSA Bulletin
Published: 01 August 2003
GSA Bulletin (2003) 115 (8): 972–982.
...-facies mineral assemblages and described bounding faults on its eastern (Hylas fault zone) and western (Spotsylvania fault or lineament) margins ( Fig. 1 ). Metavolcanic and metasedimentary rocks of a Middle Ordovician arc ( Coler et al., 2000 ) occur in the Chopawamsic terrane immediately west...
FIGURES | View All (6)
Journal Article
Journal: Geology
Published: 01 August 2004
Geology (2004) 32 (8): 669–672.
... Highlands; RP—Reading Prong; TP—Trenton Prong; HBU—Honey Brook upland; WCA—West Chester Prong–Avondale anticline; BT—Baltimore terrane; CT—Carolina terrane; PT—Piedmont terrane; RA—Roseland Anorthosite; MA—Montpelier Anorthosite; HFZ—Hylas fault zone; SFZ—Spotsylvania fault zone; RF—Reservoir fault. B, C...
FIGURES
Image
The Central Virginia seismic <span class="search-highlight">zone</span> (CVSZ) showing locations of preinstrument...
Published: 02 June 2021
area shown in Figure  2 . Faults and fault zones: CF, Chopawamsic; DGF, Dutch Gap; HF, Hylas; LBF, Long Branch; MHF, Malvern Hill; MRF, Mountain Run; PRF, Port Royal; SNF, Skinkers Neck; SPF, Spotsylvania. CEUS‐SSC, central and eastern United States–Seismic Source Characterization; USGS, U.S
Series: GSA Field Guide
Published: 01 January 2017
DOI: 10.1130/2017.0047(03)
EISBN: 9780813756479
... in the Hylas zone. The Hylas zone is a 1-3-km-wide NE-trending zone in the eastern Piedmont that separates metamorphic rocks of the Goochland Terrane to the west from the ca. 300 Ma Petersburg batholith and Richmond/Taylorsville Mesozoic basins to the east ( Bobyarchick and Glover, 1979 ; Weems, 1981...
FIGURES | View All (8)
Journal Article
Journal: Geology
Published: 01 July 2006
Geology (2006) 34 (7): 581–584.
... on the Laurentian margin. Major teeth on the serrated margin include the Alabama, Virginia, and New York promontories (i.e., Rankin, 1976 ). However, late Paleozoic strike-slip tectonics (e.g., Hylas fault zone [ Gates and Glover, 1989 ], Modoc fault zone [ Snoke et al., 1980 ], and the Brevard fault zone...
FIGURES
Journal Article
Published: 01 December 2005
Bulletin of the Seismological Society of America (2005) 95 (6): 2428–2445.
.... = Hylas mylonite zone. The 9 December 2003 epicenter is plotted by a solid star. Eighty-three earthquakes that occurred during 1978–1996 (period of dense local network coverage) are plotted with circles, events that occurred since 1997 and 11 earthquakes that occurred from 1956 to 1977 are plotted...
FIGURES | View All (10)
Journal Article
Journal: Geosphere
Published: 20 April 2023
Geosphere (2023) 19 (3): 900–932.
...” of the Petersburg “batholith” and described other mapped granite within the pluton as weakly to moderately foliated. Bobyarchick and Glover (1979) described mylonitic foliation in granite on the northwestern edge of the pluton adjacent to the Hylas fault zone ( Fig. 2 ), which is part of the Eastern Piedmont...
FIGURES | View All (17)
Image
Map of the study area showing major geologic features, topography, and eart...
Published: 01 December 2005
are indicated by shaded areas: CB, Culpepper; RB, Richmond; FB, Farmville; SB, Scottsville; and PB, Pitsylvania basins. S.F. = Spotsylvania thrust fault and H.M. = Hylas mylonite zone. The 9 December 2003 epicenter is plotted by a solid star. Eighty-three earthquakes that occurred during 1978–1996 (period
Journal Article
Published: 02 June 2021
Seismological Research Letters (2021) 92 (5): 3126–3144.
... area shown in Figure  2 . Faults and fault zones: CF, Chopawamsic; DGF, Dutch Gap; HF, Hylas; LBF, Long Branch; MHF, Malvern Hill; MRF, Mountain Run; PRF, Port Royal; SNF, Skinkers Neck; SPF, Spotsylvania. CEUS‐SSC, central and eastern United States–Seismic Source Characterization; USGS, U.S...
FIGURES | View All (6)
Image
Temperature-time-deformation (T-t-D) history for rocks of the Goochland ter...
Published: 20 April 2023
in Figure 1 ; rocks east of the Lake Gordon and Hylas fault zones, including the Dinwiddie terrane, are of the peri-Gondwanan Realm. Sabot amphibolite (sa) mantles the Mesoproterozoic State Farm Gneiss (Ysf) and Montpelier Anorthosite (Yma); the dashed line marks the approximate contact between the Sabot
Image
Figure 1.  A : Map showing major Grenvillian terranes of central Appalachia...
Published: 01 August 2004
Anorthosite; MA—Montpelier Anorthosite; HFZ—Hylas fault zone; SFZ—Spotsylvania fault zone; RF—Reservoir fault. B, C : Plots of Ga/Al × 10 4 vs. Nb ( B ) and vs. Zr ( C ) for Neoproterozoic extension-related granitoids of Blue Ridge (shaded field, 168 analyses; Tollo and Aleinikoff, 1996 ; Tollo et al
Series: GSA Field Guide
Published: 01 January 2012
DOI: 10.1130/2012.0029(10)
EISBN: 9780813756295
... overlie Goochland terrane rocks (Fig. 2 ). To the east, the Hylas zone separates Goochland terrane rocks from the late Paleozoic Petersburg granite and Mesozoic basins. To the west, the ∼10-km-wide Spotsylvania high-strain zone forms the boundary between the Goochland and Chopawamsic terranes (Fig. 2...
FIGURES | View All (9)
Journal Article
Published: 01 February 2006
The Canadian Mineralogist (2006) 44 (1): 31–44.
... ): Potassium– Argon Dating; Principles, Techniques and Application to Geochronology . W.H. Freeman and Co ., San Francisco, California . Gates , A.E. & Grover , L. , III ( 1989 ): Alleghanian tectonothermal evolution of the dextral transcurrent Hylas zone, virginia Piedmont, U.S.A . J...
FIGURES | View All (8)
Journal Article
Published: 01 September 1987
Bulletin of Canadian Petroleum Geology (1987) 35 (3): 333–357.
... associations: the Skolithos, Cruziana, Zoophycos, and Nereites Ichnocoenoses (Frey and Pemberton, 1984, 1985). Landward from the beach, the Skolithos Ichnocoenose gives way to various nonmarine ichnocoenoses, most of them as yet unnamed. However, typical environmental gradients of the coastal zone include...
Journal Article
Published: 27 December 2018
Scottish Journal of Geology (2019) 55 (1): 21–34.
... tectono-thermal evolution of the dextral transcurrent Hylas zone, Virginia Piedmont, U.S.A . Journal of Structural Geology , 11 , 407 – 419 , https://doi.org/10.1016/0191-8141(89)90018-7 Goodenough , K.M. , Millar , I. , Strachan , R.A. , Krabbendam , M. & Evans , J.A...
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