Yo-yo tectonics in a wrench zone, Central Anatolian fault zone, Turkey

Umhoefer, Paul J.; Teyssier, Christian; Fayon, A.; Casale, Gabriele; Heizler, Matthew T.

doi:10.1130/2007.2434(03)

Cited by 34 publications

(46 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the Akdağ massif, apatite fission track ages of 31.6 ± 3.2 and 31.6 ± 3.6 Ma are significantly younger than the oldest sediments that unconformably overlie the metamorphic basement rocks in this area [ Fayon et al ., ] and coincide with and likely relate to late Eocene‐Oligocene shortening recorded in sedimentary basins on the Kırşehir Block [ Gülyüz et al ., ; Advokaat et al ., ]. In the southernmost part of the Kırşehir Block, in the southeastern Niğde massif, very young apatite fission track ages of 11.1 ± 1.8 and 9.4 ± 2.2 Ma were obtained [ Fayon et al ., ], and this part of the massif was interpreted to have been exhumed in the Late Cretaceous, then overthrust and reburied in Oligocene time, and exhumed again in the late Miocene along a top‐to‐the‐SE brittle detachment [ Umhoefer et al ., ; Whitney et al ., , ; Idleman et al ., ].…”

Section: Geological Settingmentioning

confidence: 99%

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

et al. 2016

View full text Add to dashboard Cite

In Central and Western Anatolia two continent-derived massifs simultaneously underthrusted an oceanic lithosphere in the Cretaceous and ended up with very contrasting metamorphic grades: high pressure, low temperature in the Tavşanlı zone and the low pressure, high temperature in the Kırşehir Block. To assess why, we reconstruct the Cretaceous paleogeography and plate configuration of Central Anatolia using structural, metamorphic, and geochronological constraints and Africa-Europe plate reconstructions. We review and provide new 40 Ar/ 39 Ar and U/Pb ages from Central Anatolian metamorphic and magmatic rocks and ophiolites and show new paleomagnetic data on the paleo-ridge orientation in a Central Anatolian Ophiolite. Intraoceanic subduction that formed within the Neotethys around 100-90 Ma along connected N-S and E-W striking segments was followed by overriding oceanic plate extension. Already during suprasubduction zone ocean spreading, continental subduction started. We show that the complex geology of central and southern Turkey can at first order be explained by a foreland-propagating thrusting of upper crustal nappes derived from a downgoing, dominantly continental lithosphere: the Kırşehir Block and Tavşanlı zone accreted around 85 Ma, the Afyon zone around 65 Ma, and Taurides accretion continued until after the middle Eocene. We find no argument for Late Cretaceous subduction initiation within a conceptual "Inner Tauride Ocean" between the Kırşehir Block and the Afyon zone as widely inferred. We propose that the major contrast in metamorphic grade between the Kırşehir Block and the Tavşanlı zone primarily results from a major contrast in subduction obliquity and the associated burial rates, higher temperature being reached upon higher subduction obliquity.

show abstract

Section: Geological Settingmentioning

confidence: 99%

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

et al. 2016

View full text Add to dashboard Cite

show abstract

“…More often, they consist of a complex amalgamation of fault segments that regularly change orientation in sharp or diffuse bends, relay in en‐echelon steps, join with other strike‐slip faults at a single junction or spread out in a distributed fashion among multiple parallel splays, and terminate in either contractional or extensional structures at their tips (Figures a–e). Such architectural complexity leads to vertical motions and appreciable range growth or basin formation, as well as later tectonic inversions of ranges and basins (e.g., “porpoise tectonics” [ Crowell , ] or “yo‐yo tectonics” [ Umhoefer et al ., ]).…”

Section: Introductionmentioning

confidence: 98%

Low‐temperature thermochronometry along the Kunlun and Haiyuan Faults, NE Tibetan Plateau: Evidence for kinematic change during late‐stage orogenesis

et al. 2013

View full text Add to dashboard Cite

[1] The Tibetan Plateau is a prime example of a collisional orogen with widespread strike-slip faults whose age and tectonic significance remain controversial. We present new low-temperature thermochronometry to date periods of exhumation associated with Kunlun and Haiyuan faulting, two major strike-slip faults within the northeastern margin of Tibet. Apatite and zircon (U-Th)/He and apatite fission-track ages, which record exhumation from~2 to 6 km crustal depths, provide minimum bounds on fault timing. Results from Kunlun samples show increased exhumation rates along the western fault segment at circa 12-8 Ma with a possible earlier phase of motion from~30-20 Ma, along the central fault segment at circa 20-15 Ma, and along the eastern fault segment at circa 8-5 Ma. Combined with previous studies, our results suggest that motion along the Haiyuan fault may have occurred as early as~15 Ma along the western/central fault segment before initiating at least by 10-8 Ma along the eastern fault tip. We relate an~250 km wide zone of transpressional shear to synchronous Kunlun and Haiyuan fault motion and suggest that the present-day configuration of active faults along the northeastern margin of Tibet was likely established since middle Miocene time. We interpret the onset of transpression to relate to the progressive confinement of Tibet against rigid crustal blocks to the north and expansion of crustal thickening to the east during the later stages of orogen development.

show abstract

“…Some intracontinental strike‐slip faults may show tectonic switches between transpression and transtension through time, leading to cycles of burial and exhumation (e.g. Umhoefer et al. , 2007).…”

Section: Introductionmentioning

confidence: 99%

“…, 2003; Wesnousky, 2005). Although lateral displacement may juxtapose terranes that formed at very different crustal levels, in some cases there is also evidence for a significant component of vertical motion in strike‐slip fault systems (Umhoefer et al. , 2007).…”

Section: Introductionmentioning

confidence: 99%

“…In some strike-slip fault zones, exhumed orogenic crust is juxtaposed against low-grade to unmetamorphosed rocks along strike-slip faults (Misch, 1966;Stewart, 1988;Unruh et al, 2003;Wesnousky, 2005). Although lateral displacement may juxtapose terranes that formed at very different crustal levels, in some cases there is also evidence for a significant component of vertical motion in strike-slip fault systems (Umhoefer et al, 2007). In such cases, the role of strike-slip faults in the metamorphism and exhumation of orogenic crust can be investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metamorphism and deformation at different structural levels in a strike‐slip fault zone, Ross Lake fault, North Cascades, USA

Gordon

Whitney

Miller

et al. 2010

Journal Metamorphic Geology

View full text Add to dashboard Cite

Continental crust is displaced in strike-slip fault zones through lateral and vertical movement that together drive burial and exhumation. Pressure-temperature-deformation (P-T-d) histories of orogenic crust exhumed in transcurrent zones record the mechanisms and conditions of these processes. The Skagit Gneiss Complex, a migmatitic unit of the North Cascades, Washington (USA), was metamorphosed at depths of 25-30 km in a continental arc under contraction, and is bounded on its eastern side by the long-lived transcurrent Ross Lake fault zone (RLFZ). The P-T-d conditions recorded by rocks on either side of the RLFZ vary along the length of the fault zone, but most typically the fault separates high-grade gneiss and plutons from lower-grade rocks. The Ruby Mt-Elijah Ridge area at the eastern margin of the Skagit Gneiss exposes tectonic contacts between gneiss and overlying rocks; the latter rocks, including slivers of Methow basin deposits, are metamorphosed and record higher-grade metamorphism than in correlative rocks along strike along the RLFZ. In this area, the Skagit Gneiss and overlying units all yield maximum P-T conditions of 8-10 kbar at >650°C, indicating that slices of basin rocks were buried to similar mid-crustal depths as the gneiss. After exhumation of fault zone rocks to <15 km depth, intrusion of granitoid plutons drove contact metamorphism, resulting in texturally late andalusite-cordierite in garnet schist. In the Elijah Ridge area of the RLFZ, an overlapping step-over or series of step-overs that evolved through time may have facilitated burial and exhumation of a deep slice of the Methow basin, indicating that strike-slip faults can have major vertical displacement (tens of kilometres) that is significant during the crustal thickening and exhumation stages of orogeny.

show abstract

Yo-yo tectonics in a wrench zone, Central Anatolian fault zone, Turkey

Cited by 34 publications

References 23 publications

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

Tectonic evolution and paleogeography of the Kırşehir Block and the Central Anatolian Ophiolites, Turkey

Low‐temperature thermochronometry along the Kunlun and Haiyuan Faults, NE Tibetan Plateau: Evidence for kinematic change during late‐stage orogenesis

Metamorphism and deformation at different structural levels in a strike‐slip fault zone, Ross Lake fault, North Cascades, USA

Contact Info

Product

Resources

About