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John S Singleton - One of the best experts on this subject based on the ideXlab platform.
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miocene slip history of the eagle eye detachment fault harquahala mountains metamorphic core complex west central arizona
Tectonics, 2016Co-Authors: Michael G Prior, Daniel F Stockli, John S SingletonAbstract:The structural and thermal evolution of major low-angle normal faults in the Colorado River extensional corridor has been a controversial topic since the pioneering studies of metamorphic core complexes in the early 1980s. We present new geo-thermochronometry data from the Harquahala Mountains in west-central Arizona to determine the timing of extension, Displacement magnitude, and slip rates along the Eagle Eye detachment fault (EED) during large-magnitude Miocene extension. Zircon and apatite (U-Th)/He data (ZHe and AHe, respectively) from 31 samples along a ~55 km extension-parallel transect indicate active slip along the EED occurred between ~21 ± 1 Ma until ~14 Ma. The spatial extent of ZHe ages and exhumation of the zircon partial retention zone indicated ~44 ± 2 km of Total Displacement, whereas lithologic similarity and identical U-Pb ages between correlated footwall rocks in the Little Harquahala Mountains and breccia clasts at Bullard Peak in the NE Harcuvar Mountains indicated ~43-45 km of Displacement across the EED. AHe and ZHe data indicated slip rates of ~6.7 + 7.8/-2.3 km/Myr, and ~6.6 + 7.1/-2.0 km/Myr, respectively, both consistent with the duration and Displacement estimates. The EED initiated as a listric fault with an ~34 ± 9° dip that decreased to ~13 ± 5° below ~7 km depth. Secondary breakaway development and footwall exposure occurred by ~17 Ma, during active EED slip. Lithologic and geo-thermochronometric offset constraints show excellent agreement and provided a rare opportunity to fully resolve the timing, rates, and Total Displacement magnitudes along a major continental detachment fault.
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timing rate and magnitude of slip on the buckskin rawhide detachment fault west central arizona
Tectonics, 2014Co-Authors: John S Singleton, Daniel F Stockli, Phillip B Gans, Michael G PriorAbstract:We present thermochronologic and geochronologic data that constrain the slip history of the Buckskin-Rawhide detachment fault in west central Arizona, one of the largest extensional fault systems in the North American Cordillera. (U-Th)/He zircon and apatite thermochronology, integrated with 40Ar/39Ar geochronology of postdetachment volcanic rocks, indicate that large-magnitude extension associated with the detachment fault initiated at ~21–20 Ma and continued until ~12–11 Ma in the southwestern portion of the Buckskin-Rawhide metamorphic core complex. (U-Th)/He footwall cooling ages from the breakaway zone in the western Bouse Hills to upper greenschist-facies mylonites in the southern Buckskin Mountains indicate that the slip rate on the detachment fault was 3 + 1.5/−1 km/Myr during the early Miocene. Space-time patterns of hanging wall tilting suggest that at 17–16 Ma, a secondary detachment fault breakaway developed ~12 km northeast of the primary detachment fault breakaway. Proximal conglomerates deposited in a supradetachment basin adjacent to the secondary breakaway scarp were displaced 6–11 km northeast in the middle Miocene by the Buckskin-Rawhide detachment fault at a slip rate of 1.2–2.7 km/Myr. The Total Displacement across the detachment fault in the southwestern portion of the core complex is 24 ± 10 km, well short of the previous estimate of 66 ± 8 km across the entire core complex. Based on these data and new observations, we propose that Total Displacement on the Buckskin-Rawhide detachment fault system increases in the slip direction to ~40–50 km at the northeastern end of the exposed footwall, corresponding to time-averaged slip rates that ranged from ~2 km/Myr to ≤6 km/Myr across the entire core complex.
A Barka - One of the best experts on this subject based on the ideXlab platform.
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morphology Displacement and slip rates along the north anatolian fault turkey
Journal of Geophysical Research, 2002Co-Authors: Rolando Armijo, Geoffrey King, Bertrand Meyer, Aurelia Hubertferrari, A BarkaAbstract:[1] Geological and geomorphological offsets at different scales are used to constrain the localization of deformation, Total Displacement, and slip rates over various timescales along the central and eastern North Anatolian Fault (NAF) in Turkey. The NAF Total Displacement is reevaluated using large rivers valleys (80 ± 15 km) and structural markers (Pontide Suture, 85 ± 25 km; Tosya-Vezirkopru basins, 80 ± 10 km). These suggest a Neogene slip rate of 6.5 mm/yr over 13 Myr. The river network morphology shows offsets at a range of scales (20 m to 14 km) across the main fault trace and is also used to estimate the degree to which deformation is localized. At a smaller scale the morphology associated with small rivers is offset by 200 m along the NAF. The age of these features can be correlated with the Holocene deglaciation and a slip rate of 18 ± 3.5 mm/yr is determined. This is consistent with a rate of 18 ± 5 mm/yr deduced independently from the 14C dating of stream terrace offsets. Over the short term, GPS data gives a similar rate of 22 ± 3 mm/yr. All our results tend to show that most of the deformation between the Anatolian and Eurasian lithospheric plates has been accommodated along, or very close to, the active trace of the NAF. The difference between the Neogene and the Holocene slip rate may be due to the recent establishment of the current plate geometry after the creation of the NAF.
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westward propagation of the north anatolian fault into the northern aegean timing and kinematics
Geology, 1999Co-Authors: Rolando Armijo, Bertrand Meyer, Aurelia Hubert, A BarkaAbstract:We present new evidence for the propagation processes of the North Anatolian fault. Folding in the Dardanelles Straits region allows us to document the timing of the deformation preceding, and the finite Displacement after, the passage of the propagating tip of the fault. The accuracy of the observations is due to interplay between deformation and the sea-level changes in the Mediterranean (the well-known Messinian regression followed by the Pliocene transgression). The long-term kinematics around the Sea of Marmara pull-apart (Total Displacement of about 85 km over the past 5 m.y.) is similar to the present-day kinematics deduced from space geodesy. At a larger scale, westward propagation of the North Anatolian fault over nearly 2000 km in the past 10 m.y. appears to be associated with strain recovery, suggesting that the continental lithosphere retains long-term elasticity.
Michael G Prior - One of the best experts on this subject based on the ideXlab platform.
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miocene slip history of the eagle eye detachment fault harquahala mountains metamorphic core complex west central arizona
Tectonics, 2016Co-Authors: Michael G Prior, Daniel F Stockli, John S SingletonAbstract:The structural and thermal evolution of major low-angle normal faults in the Colorado River extensional corridor has been a controversial topic since the pioneering studies of metamorphic core complexes in the early 1980s. We present new geo-thermochronometry data from the Harquahala Mountains in west-central Arizona to determine the timing of extension, Displacement magnitude, and slip rates along the Eagle Eye detachment fault (EED) during large-magnitude Miocene extension. Zircon and apatite (U-Th)/He data (ZHe and AHe, respectively) from 31 samples along a ~55 km extension-parallel transect indicate active slip along the EED occurred between ~21 ± 1 Ma until ~14 Ma. The spatial extent of ZHe ages and exhumation of the zircon partial retention zone indicated ~44 ± 2 km of Total Displacement, whereas lithologic similarity and identical U-Pb ages between correlated footwall rocks in the Little Harquahala Mountains and breccia clasts at Bullard Peak in the NE Harcuvar Mountains indicated ~43-45 km of Displacement across the EED. AHe and ZHe data indicated slip rates of ~6.7 + 7.8/-2.3 km/Myr, and ~6.6 + 7.1/-2.0 km/Myr, respectively, both consistent with the duration and Displacement estimates. The EED initiated as a listric fault with an ~34 ± 9° dip that decreased to ~13 ± 5° below ~7 km depth. Secondary breakaway development and footwall exposure occurred by ~17 Ma, during active EED slip. Lithologic and geo-thermochronometric offset constraints show excellent agreement and provided a rare opportunity to fully resolve the timing, rates, and Total Displacement magnitudes along a major continental detachment fault.
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timing rate and magnitude of slip on the buckskin rawhide detachment fault west central arizona
Tectonics, 2014Co-Authors: John S Singleton, Daniel F Stockli, Phillip B Gans, Michael G PriorAbstract:We present thermochronologic and geochronologic data that constrain the slip history of the Buckskin-Rawhide detachment fault in west central Arizona, one of the largest extensional fault systems in the North American Cordillera. (U-Th)/He zircon and apatite thermochronology, integrated with 40Ar/39Ar geochronology of postdetachment volcanic rocks, indicate that large-magnitude extension associated with the detachment fault initiated at ~21–20 Ma and continued until ~12–11 Ma in the southwestern portion of the Buckskin-Rawhide metamorphic core complex. (U-Th)/He footwall cooling ages from the breakaway zone in the western Bouse Hills to upper greenschist-facies mylonites in the southern Buckskin Mountains indicate that the slip rate on the detachment fault was 3 + 1.5/−1 km/Myr during the early Miocene. Space-time patterns of hanging wall tilting suggest that at 17–16 Ma, a secondary detachment fault breakaway developed ~12 km northeast of the primary detachment fault breakaway. Proximal conglomerates deposited in a supradetachment basin adjacent to the secondary breakaway scarp were displaced 6–11 km northeast in the middle Miocene by the Buckskin-Rawhide detachment fault at a slip rate of 1.2–2.7 km/Myr. The Total Displacement across the detachment fault in the southwestern portion of the core complex is 24 ± 10 km, well short of the previous estimate of 66 ± 8 km across the entire core complex. Based on these data and new observations, we propose that Total Displacement on the Buckskin-Rawhide detachment fault system increases in the slip direction to ~40–50 km at the northeastern end of the exposed footwall, corresponding to time-averaged slip rates that ranged from ~2 km/Myr to ≤6 km/Myr across the entire core complex.
Rolando Armijo - One of the best experts on this subject based on the ideXlab platform.
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morphology Displacement and slip rates along the north anatolian fault turkey
Journal of Geophysical Research, 2002Co-Authors: Rolando Armijo, Geoffrey King, Bertrand Meyer, Aurelia Hubertferrari, A BarkaAbstract:[1] Geological and geomorphological offsets at different scales are used to constrain the localization of deformation, Total Displacement, and slip rates over various timescales along the central and eastern North Anatolian Fault (NAF) in Turkey. The NAF Total Displacement is reevaluated using large rivers valleys (80 ± 15 km) and structural markers (Pontide Suture, 85 ± 25 km; Tosya-Vezirkopru basins, 80 ± 10 km). These suggest a Neogene slip rate of 6.5 mm/yr over 13 Myr. The river network morphology shows offsets at a range of scales (20 m to 14 km) across the main fault trace and is also used to estimate the degree to which deformation is localized. At a smaller scale the morphology associated with small rivers is offset by 200 m along the NAF. The age of these features can be correlated with the Holocene deglaciation and a slip rate of 18 ± 3.5 mm/yr is determined. This is consistent with a rate of 18 ± 5 mm/yr deduced independently from the 14C dating of stream terrace offsets. Over the short term, GPS data gives a similar rate of 22 ± 3 mm/yr. All our results tend to show that most of the deformation between the Anatolian and Eurasian lithospheric plates has been accommodated along, or very close to, the active trace of the NAF. The difference between the Neogene and the Holocene slip rate may be due to the recent establishment of the current plate geometry after the creation of the NAF.
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westward propagation of the north anatolian fault into the northern aegean timing and kinematics
Geology, 1999Co-Authors: Rolando Armijo, Bertrand Meyer, Aurelia Hubert, A BarkaAbstract:We present new evidence for the propagation processes of the North Anatolian fault. Folding in the Dardanelles Straits region allows us to document the timing of the deformation preceding, and the finite Displacement after, the passage of the propagating tip of the fault. The accuracy of the observations is due to interplay between deformation and the sea-level changes in the Mediterranean (the well-known Messinian regression followed by the Pliocene transgression). The long-term kinematics around the Sea of Marmara pull-apart (Total Displacement of about 85 km over the past 5 m.y.) is similar to the present-day kinematics deduced from space geodesy. At a larger scale, westward propagation of the North Anatolian fault over nearly 2000 km in the past 10 m.y. appears to be associated with strain recovery, suggesting that the continental lithosphere retains long-term elasticity.
Daniel F Stockli - One of the best experts on this subject based on the ideXlab platform.
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miocene slip history of the eagle eye detachment fault harquahala mountains metamorphic core complex west central arizona
Tectonics, 2016Co-Authors: Michael G Prior, Daniel F Stockli, John S SingletonAbstract:The structural and thermal evolution of major low-angle normal faults in the Colorado River extensional corridor has been a controversial topic since the pioneering studies of metamorphic core complexes in the early 1980s. We present new geo-thermochronometry data from the Harquahala Mountains in west-central Arizona to determine the timing of extension, Displacement magnitude, and slip rates along the Eagle Eye detachment fault (EED) during large-magnitude Miocene extension. Zircon and apatite (U-Th)/He data (ZHe and AHe, respectively) from 31 samples along a ~55 km extension-parallel transect indicate active slip along the EED occurred between ~21 ± 1 Ma until ~14 Ma. The spatial extent of ZHe ages and exhumation of the zircon partial retention zone indicated ~44 ± 2 km of Total Displacement, whereas lithologic similarity and identical U-Pb ages between correlated footwall rocks in the Little Harquahala Mountains and breccia clasts at Bullard Peak in the NE Harcuvar Mountains indicated ~43-45 km of Displacement across the EED. AHe and ZHe data indicated slip rates of ~6.7 + 7.8/-2.3 km/Myr, and ~6.6 + 7.1/-2.0 km/Myr, respectively, both consistent with the duration and Displacement estimates. The EED initiated as a listric fault with an ~34 ± 9° dip that decreased to ~13 ± 5° below ~7 km depth. Secondary breakaway development and footwall exposure occurred by ~17 Ma, during active EED slip. Lithologic and geo-thermochronometric offset constraints show excellent agreement and provided a rare opportunity to fully resolve the timing, rates, and Total Displacement magnitudes along a major continental detachment fault.
-
timing rate and magnitude of slip on the buckskin rawhide detachment fault west central arizona
Tectonics, 2014Co-Authors: John S Singleton, Daniel F Stockli, Phillip B Gans, Michael G PriorAbstract:We present thermochronologic and geochronologic data that constrain the slip history of the Buckskin-Rawhide detachment fault in west central Arizona, one of the largest extensional fault systems in the North American Cordillera. (U-Th)/He zircon and apatite thermochronology, integrated with 40Ar/39Ar geochronology of postdetachment volcanic rocks, indicate that large-magnitude extension associated with the detachment fault initiated at ~21–20 Ma and continued until ~12–11 Ma in the southwestern portion of the Buckskin-Rawhide metamorphic core complex. (U-Th)/He footwall cooling ages from the breakaway zone in the western Bouse Hills to upper greenschist-facies mylonites in the southern Buckskin Mountains indicate that the slip rate on the detachment fault was 3 + 1.5/−1 km/Myr during the early Miocene. Space-time patterns of hanging wall tilting suggest that at 17–16 Ma, a secondary detachment fault breakaway developed ~12 km northeast of the primary detachment fault breakaway. Proximal conglomerates deposited in a supradetachment basin adjacent to the secondary breakaway scarp were displaced 6–11 km northeast in the middle Miocene by the Buckskin-Rawhide detachment fault at a slip rate of 1.2–2.7 km/Myr. The Total Displacement across the detachment fault in the southwestern portion of the core complex is 24 ± 10 km, well short of the previous estimate of 66 ± 8 km across the entire core complex. Based on these data and new observations, we propose that Total Displacement on the Buckskin-Rawhide detachment fault system increases in the slip direction to ~40–50 km at the northeastern end of the exposed footwall, corresponding to time-averaged slip rates that ranged from ~2 km/Myr to ≤6 km/Myr across the entire core complex.
