Generalized bedrock geologic map and distribution of mylonitic rocks in the eastern Pinaleno Mountains, Graham County, Arizona

Thorman, Charles H.; Naruk, Stephen J.

doi:10.3133/ofr87614

Cited by 5 publications

(13 citation statements)

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“…The Safford Basin lies within the north-eastern part of the highly extended terrain of the southern Basin and Generalized stratigraphic columns for the Pinaleiio Mountains, Safford Basin and surrounding region with stratigraphic relationships, ages (including radioisotope dates) and generalized description compiled from several sources (Marlowe, 1961 ;Harbour, 1966;Dickson & Izett, 1081;Thorman, 1981;Richter et af., 1981Richter et af., , 1983Drewes et al, 1985;Houser er al., 1985;Naruk, 1986Naruk, , 1987Reynolds, 1988;Houser, 1990). Interfingering relationships between basin-fill units are discussed in the text.…”

Section: Safford Basinmentioning

confidence: 99%

“…1). This mylonite zone was probably created by top-to-the-NE extension during mid-Tertiary deformation (Naruk, 1986, 1Y87;Thorman & Naruk, 1987). This mylonite zone was probably created by top-to-the-NE extension during mid-Tertiary deformation (Naruk, 1986, 1Y87;Thorman & Naruk, 1987).…”

Section: Pinaleiio Mountains Core Complexmentioning

confidence: 99%

“…Upper-plate sedimentary, volcanic and intrusive rocks are exposed above detachment faults in the southern Pinalefio Mountains (Thorman, 1981;Drewes et af., 1985), above the Eagle Pass detachment fault (Blacet & Miller, 1978;Davis & Hardy, 1981) and above multiple detachment faults in the Black Rock area (Blacet & Miller, 1978;Simons, 1987;Tor0 et a/., 1990) (Fig. 1).…”

Section: Pinaleiio Mountains Core Complexmentioning

confidence: 99%

“…Although a significant amount of flattening appears to have occurred along the detachment fault as it reached the surface during earlier phases of extension, as indicated by slices of upper plate exposed in the Eagle Pass (Blacet & Miller, 1978;Davis & Hardy, 1981) and Black Rock areas (Blacet & Miller, 1978;Simons, 1987;Tor0 et al, 1990), and gentle dips of the mylonite zone associated with the detachment fault (Naruk, 1986(Naruk, , 1987Thorman & Naruk, 1987) (Fig. Although a significant amount of flattening appears to have occurred along the detachment fault as it reached the surface during earlier phases of extension, as indicated by slices of upper plate exposed in the Eagle Pass (Blacet & Miller, 1978;Davis & Hardy, 1981) and Black Rock areas (Blacet & Miller, 1978;Simons, 1987;Tor0 et al, 1990), and gentle dips of the mylonite zone associated with the detachment fault (Naruk, 1986(Naruk, , 1987Thorman & Naruk, 1987) (Fig.…”

Section: Implications For the Roiling Hinge Model And Secondary Breakmentioning

confidence: 99%

“…Mid-Tertiary sedimentary rocks from Reynolds (1988). Extension of mylonite zone along the eastern flank of the Pinalefio Mountains from Thorman & Naruk (1987). Black Rock detachment from Tor0 et al .…”

Section: Safford Basinmentioning

confidence: 99%

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Miocene‐Pliocene half‐graben evolution, detachment faulting and late‐stage core complex uplift from reflection seismic data in south‐east Arizona

1995

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A B S T R A C TReflection seismic data show that the late Cenozoic Safford Basin in the Basin and Range of south-eastern Arizona, is a 4.5-km-deep, NW-trending, SW-dipping half graben composed of middle Miocene to upper Pliocene sediments, separated by a late Miocene sequence boundary into lower and upper basin-fill sequences. Extension during lower basin-fill deposition was accommodated along an E-dipping range-bounding fault comprising a secondary breakaway zone along the north-east flank of the Pinaleiio Mountains core complex. This fault was a listric detachment fault, active throughout the mid-Tertiary and late Cenozoic, or a younger fault splay that cut or merged with the detachment fault. Most extension in the basin was accommodated by slip on the range-bounding fault, although episodic movement along antithetic faults temporarily created a symmetric graben. Upper-plate movement over bends in the range-bounding fault created rollover structures in the basin fill and affected deposition within the half graben. Rapid periods of subsidence relative to sedimentation during lower basin-fill deposition created thick, laterally extensive lacustrine or alluvial plain deposits, and restricted proximal alluvian-fan deposits to the basin margins. A period of rapid extension and subsidence relative to sediment influx, or steepening of the upper segment of the range-bounding fault at the start of upper basin-fill deposition resulted in a large downwarp over a major fault bend. Sedimentation was restricted to this downwarp until filled. Episodic subsidence during upper basin-fill deposition caused widespread interbedding of lacustrine and fluvial deposits. Northeastward tilting along the south-western flank of the basin and north-eastward migration of the depocentre during later periods of upper basin-fill deposition suggest decreased extension rates relative to late-stage core complex uplift.Reflection seismic data were acquired by industry and processed using a typical processing flow. The Amoco data, which include lines 1, 3A, 3B and 4 (Figs 1 and 3 -9 , were acquired using a split spread configuration with a 96-channel system. T h e station interval was 33.5m (1lOft) with a far offset of 1.6km (1 mile). Vibration points were at every other station (67x11 (220 ft)) using a 12-s up-sweep from 14 to 80 Hz. These data were reprocessed at the University of Arizona using the SierraseisrM processing package in order to preserve relative true amplitudes for seismic facies interpretation. 132 0 (1986) The relationship between the geometry of normal faults and that of the sedimentary layers in their hanging walls. 3. struct. Geol., 8, 897-909. WYNN, J. C. (1981) Complete Bouguer gravity anomaly map of the Silver City I" X 2" quadrangle, New Mexico-Arizona.

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Section: Safford Basinmentioning

confidence: 99%

Section: Pinaleiio Mountains Core Complexmentioning

confidence: 99%

Section: Pinaleiio Mountains Core Complexmentioning

confidence: 99%

Section: Implications For the Roiling Hinge Model And Secondary Breakmentioning

confidence: 99%

Section: Safford Basinmentioning

confidence: 99%

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Miocene‐Pliocene half‐graben evolution, detachment faulting and late‐stage core complex uplift from reflection seismic data in south‐east Arizona

1995

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(U‐Th)/He and ⁴He/³He Thermochronology of Secondary Oxides in Faults and Fractures: A Regional Perspective From Southeastern Arizona

Scoggin

Reiners

Shuster

et al. 2021

Geochem Geophys Geosyst

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Oligocene‐Miocene Exhumation of the Pinaleño Metamorphic Core Complex, Southeastern Arizona: Support for Magmatism and Plate Margin Reorganization as Controls on Regional Exhumation Trends

Chapman,

Scoggin,

Jepson

et al. 2024

Tectonics

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The Pinaleño Mountains of southeastern Arizona is the eastern‐most metamorphic core complex in the southern U.S. and northern Mexican Cordillera. This study investigates the thermal history and exhumation record of the Pinaleño core complex using mica 40Ar/39Ar, apatite and zircon (U‐Th)/He, and apatite fission‐track thermochronometers. The Pinaleño Mountains experienced two periods of rapid cooling during the Cenozoic. The first period, from ca. 27 to 21 Ma, records tectonic exhumation related to the development of the core complex and extensional shear zone. This period was followed by a relatively quiescent interval from 21 to 13.5 Ma that records little to no exhumation. The second period of rapid cooling, from 13.5 to 11 Ma, records tectonic exhumation related to high‐angle normal faulting, characteristic of the Basin and Range province. The exhumation timing of the Pinaleño core complex matches previously recognized spatiotemporal trends in the southern Basin and Range province and indicates that core complex exhumation in this region started in southeastern Arizona (ca. 32–33°N) and migrated both northward and southward. These trends correlate well with the latitude and timing of subduction of the Pacific‐Farallon spreading ridge and the migration of the Mendocino (northward) and Rivera (southward) triple junctions. Spatiotemporal core complex exhumation trends also correlate well with regional magmatism associated with the mid‐Cenozoic flare‐up, including syn‐extensional intrusive rocks found in the footwalls of core complexes.

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Generalized bedrock geologic map and distribution of mylonitic rocks in the eastern Pinaleno Mountains, Graham County, Arizona

Cited by 5 publications

References 0 publications

Miocene‐Pliocene half‐graben evolution, detachment faulting and late‐stage core complex uplift from reflection seismic data in south‐east Arizona

Miocene‐Pliocene half‐graben evolution, detachment faulting and late‐stage core complex uplift from reflection seismic data in south‐east Arizona

(U‐Th)/He and ⁴He/³He Thermochronology of Secondary Oxides in Faults and Fractures: A Regional Perspective From Southeastern Arizona

Oligocene‐Miocene Exhumation of the Pinaleño Metamorphic Core Complex, Southeastern Arizona: Support for Magmatism and Plate Margin Reorganization as Controls on Regional Exhumation Trends

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Generalized bedrock geologic map and distribution of mylonitic rocks in the eastern Pinaleno Mountains, Graham County, Arizona

Cited by 5 publications

References 0 publications

Miocene‐Pliocene half‐graben evolution, detachment faulting and late‐stage core complex uplift from reflection seismic data in south‐east Arizona

Miocene‐Pliocene half‐graben evolution, detachment faulting and late‐stage core complex uplift from reflection seismic data in south‐east Arizona

(U‐Th)/He and 4He/3He Thermochronology of Secondary Oxides in Faults and Fractures: A Regional Perspective From Southeastern Arizona

Oligocene‐Miocene Exhumation of the Pinaleño Metamorphic Core Complex, Southeastern Arizona: Support for Magmatism and Plate Margin Reorganization as Controls on Regional Exhumation Trends

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(U‐Th)/He and ⁴He/³He Thermochronology of Secondary Oxides in Faults and Fractures: A Regional Perspective From Southeastern Arizona