Abstract
AbstractThe Corinth Rift, central Greece, enables analysis of early rift development as it is young (<5 Ma) and highly active and its full history is recorded at high resolution by sedimentary systems. A complete compilation of marine geophysical data, complemented by onshore data, is used to develop a high‐resolution chronostratigraphy and detailed fault history for the offshore Corinth Rift, integrating interpretations and reconciling previous discrepancies. Rift migration and localization of deformation have been significant within the rift since inception. Over the last circa 2 Myr the rift transitioned from a spatially complex rift to a uniform asymmetric rift, but this transition did not occur synchronously along strike. Isochore maps at circa 100 kyr intervals illustrate a change in fault polarity within the short interval circa 620–340 ka, characterized by progressive transfer of activity from major south dipping faults to north dipping faults and southward migration of discrete depocenters at ~30 m/kyr. Since circa 340 ka there has been localization and linkage of the dominant north dipping border fault system along the southern rift margin, demonstrated by lateral growth of discrete depocenters at ~40 m/kyr. A single central depocenter formed by circa 130 ka, indicating full fault linkage. These results indicate that rift localization is progressive (not instantaneous) and can be synchronous once a rift border fault system is established. This study illustrates that development processes within young rifts occur at 100 kyr timescales, including rapid changes in rift symmetry and growth and linkage of major rift faults.
Highlights
The Corinth Rift, central Greece, enables analysis of early rift development as it is young (
These results indicate that rift localization is progressive and can be synchronous once a rift border fault system is established
Over the past 20 years, numerous studies of synrift deformation have furthered our knowledge of fault and rift evolution, e.g., North Sea [Fossen and Hesthammer, 1998; Cowie et al, 2005; Bell et al, 2014], Gulf of Corinth Rift [e.g., Taylor et al, 2011; Ford et al, 2013], East African Rift [Hayward and Ebinger, 1996], Rio Grande Rift [Leeder and Mack, 2009], Gulf of Suez [Gawthorpe et al, 2003], and Gulf of California [Aragón-Arreola et al, 2005]
Summary
Over the past 20 years, numerous studies of synrift deformation have furthered our knowledge of fault and rift evolution, e.g., North Sea [Fossen and Hesthammer, 1998; Cowie et al, 2005; Bell et al, 2014], Gulf of Corinth Rift [e.g., Taylor et al, 2011; Ford et al, 2013], East African Rift [Hayward and Ebinger, 1996], Rio Grande Rift [Leeder and Mack, 2009], Gulf of Suez [Gawthorpe et al, 2003], and Gulf of California [Aragón-Arreola et al, 2005] Studies of these evolving and mature rifts have recognized progressive strain localization as an important process in rift evolution on a variety of temporal and spatial scales. Some studies have investigated the evolution of individual fault systems at NIXON ET AL
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