Rapid spatiotemporal variations in rift structure during development of the Corinth Rift, central Greece
Rapid spatiotemporal variations in rift structure during development of the Corinth Rift, central Greece
复制标题
DOI：
10.1002/2015tc004026
复制
发表时间：
2016-05
期刊：
影响因子：
4.2
通讯作者：
C. Nixon;L. McNeill;J. Bull;R. Bell;R. Gawthorpe;T. Henstock;D. Christodoulou;M. Ford;B. Taylor;D. Sakellariou;G. Ferentinos;G. Papatheodorou;M. Leeder;R. Collier;A. Goodliffe;M. Sachpazi;H. Kranis
中科院分区：
文献类型：
--
作者：
C. Nixon;L. McNeill;J. Bull;R. Bell;R. Gawthorpe;T. Henstock;D. Christodoulou;M. Ford;B. Taylor;D. Sakellariou;G. Ferentinos;G. Papatheodorou;M. Leeder;R. Collier;A. Goodliffe;M. Sachpazi;H. Kranis
希腊中部的科林斯裂谷非常年轻（小于5 Ma），非常活跃，沉积体系以高分辨率记录了其完整的历史，因此可以对早期裂谷发育进行分析。一个完整的海洋地球物理数据汇编，辅以陆上数据，用于开发高分辨率的年代地层和详细的离岸科林斯裂谷断层历史，整合解释和调和以前的差异。自裂谷形成以来，裂谷的迁移和形变的局部化一直是重要的。在最后大约2万年，裂谷从一个空间复杂的裂谷转变为一个均匀的不对称裂谷，但这种转变并不是沿走向同步发生的。约100 kyr的等差线图显示，在约620 ~ 340 ka的短时间内，断层极性发生了变化，其特征是活动从主要南倾断层向北倾断层渐进式转移，离散沉积中心以~30 m/kyr的速度向南迁移。约340 ka以来，南裂谷边缘主要的北倾边界断裂系统被定位和联动，以~40 m/kyr的离散沉积中心横向生长为证。约130 ka形成单一的中心沉积中心，显示完整的断层联动。这些结果表明，裂谷定位是渐进的（不是瞬时的），一旦裂谷边界断裂系统建立，裂谷定位可能是同步的。该研究表明，年轻裂谷的发育过程发生在100 kyr的时间尺度上，包括裂谷对称性的快速变化和主要裂谷断裂的生长和联系。
The 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.