Palaeostress Inversion in a Multiphase Deformed Area: Kinematic and Structural Evolution of the Çankırı Basin (Central Turkey), Part 1 – Northern Area

Abstract

Abstract:The kinematic and structural evolution of the major structures affecting the ~ankln Basin, central Turkey, has been deduced from a palaeostress inversion study. Four palaeostress tensor configurations indicative of four-phase structural evolution have been constructed from the fault slip data collected from the ~anklri Basin. The first two phases indicate the dominant role of thrusting and folding, and are attributed to the collision between the Pontides and the Taurides, the proposed interface of which is straddled by the ~ankin Basin. Phase 1 occurred in the pre-Late Palaeocene and Phase 2 in the Late Palaeocene-pre-Burdigalian. The third phase is dominated by extensional deformation in the Middle Miocene. The latest phase has been active since then and is characterized by regional transcurrent tectonics.

Middle Eocene paleomagnetic data from the eastern Sakarya Zone and the central Pontides: Implications for the tectonic evolution of north central Anatolia

“…We integrate the results with previously published paleomagnetic data in order to provide quantitative constraints on the proposed tectonic models. The results support the collision and indentation model for the Kırşehir Block, as previously suggested by Kaymakcı et al [2000Kaymakcı et al [ , 2003aKaymakcı et al [ , 2003b. Yılmaz et al, 1995;Stampfli, 2000].…”

“…The basin is surrounded by the North Anatolian Ophiolitic Belt, and has an W shape and imbricated structure. Thrusts and faults which developed during collision between the Kırşehir Block and the Pontides, are the main structures that define the western and northern rims of the basin [Kaymakcı et al, 2000].…”

“…The shape has been explained by the northward drift of the Kırşehir Block (which consists of rigid crystalline rocks) and its eventual indentation into the Pontides (foreland) continent [Kaymakcı et al, 2003a[Kaymakcı et al, , 2003bMeijers et al, 2010]. This process produced a crustal deformation defined by thrusts and reverse faults, mainly within the indenting Kırşehir Block [Kaymakcı et al, 2000].…”

Kinematic analysis and palaeoseismology of the Edremit Fault Zone: evidence for past earthquakes in the southern branch of the North Anatolian Fault Zone, Biga Peninsula, NW Turkey

“…Angelier, 1979Angelier, , 1994Armijo, Carey, & Cisternas, 1982;Marrett & Allmendinger, 1990;Will & Powell, 1991;Yamaji, 2000;Yin & Ranalli, 1993;Žalohar & Vrabec, 2007) were developed for the computer-based inversion of structural data. Because of the robustness in multistage deformed areas (see Angelier et al, 1981;Brahim et al, 2002;Hippolyte & Mann, 2011;Kaymakçı, White, & van Dijk, 2000;Sperner et al, 2003;Vandycke & Bergerat, 2001), we used the Direct Inversion Method (INVD) of Angelier (1990) in this study; however, we refer to Angelier (1994) for a detailed review of the method and to Sperner and Zweigel (2010) and Hippolyte, Bergerat, Gordon, Bellier, and Espurt (2012) for data acquisition and separation techniques. Briefly, the INVD is based on the reduced stress tensor concept and the estimation of the stress ellipsoid by the shape factor (Φ), which varies between 0 and 1.…”

A Miocene onset of the modern extensional regime in the Isparta Angle: constraints from the Yalvaç Basin (southwest Turkey)

“…The locus of E-W extension appears to migrate westwards through central Anatolia with time, and following their extension, become shortened in a N-S direction again, first in the Kırsehir massif and Ulukısla basins in Eo-Oligocene times (e.g. Robertson 2002, 2005;Gülyüz et al 2013;Advokaat et al 2014), and in Middle Miocene in Çankırı Basin (Kaymakci et al 2000(Kaymakci et al , 2001a(Kaymakci et al , b, 2003, and Late Miocene time also in the Tuzgolu Basin (until ~6.8 Ma, Özsayin et al 2013). We have no evidence that N-S shortening has affected our study area yet and conclude that the causes of this compression should be restricted to an area east of the Western Taurides, for instance, induced by collision of Cyprus with Turkey reflected in late Miocene shortening of the Kyrenia range (e.g.…”