Initiation and propagation of polygonal fault arrays by thermally triggered volume reduction reactions in siliceous sediment
Initiation and propagation of polygonal fault arrays by thermally triggered volume reduction reactions in siliceous sediment
复制标题
硅质沉积物中热触发减容反应引起的多边形断层阵列的引发和传播
DOI：
10.1016/j.margeo.2011.05.005
复制
发表时间：
2011
期刊：
影响因子：
2.9
通讯作者：
M. Ireland
中科院分区：
文献类型：
--
作者：
R. Davies;M. Ireland
世界各地的沉积盆地中都记录了多边形断层阵列，并且存在几种关于它们如何启动和传播的理论。来自挪威近海多边形断层阵列的三维地震数据用于开发多边形断层发育的新过程模型。我们认为，在硅质沉积物中，由于蛋白石-A 在 100-1000 m 深度处转化为蛋白石-CT，多边形断层阵列可以被热触发。这种转变导致差异压实和剪切破坏，从而引发断层。最早断层的位置取决于蛋白石-A 到蛋白石-CT 转换和压实首先发生的位置。这是由哪些地层具有有利的床组成、局部流体化学和温度控制的，或者是因为地层由于存在预先存在的结构起伏（褶皱或断层）而首先到达反应前沿的深度。由于持续的局部压实差异，生物硅质沉积物通过蛋白石-A 到蛋白石-CT 反应前沿的沉降导致断层传播。由于二氧化硅转化而导致的断层萌生和传播在比之前认为可能更深的埋藏深度处产生多边形断层阵列。
Polygonal fault arrays have been documented in sedimentary basins from around the world and several theories exist as to how they initiate and propagate. Three-dimensional seismic data from polygonal fault arrays from offshore Norway are used to develop a new process model for polygonal fault development. We propose that in siliceous sediment, polygonal fault arrays can be triggered thermally, due to the conversion of opal-A to opal-CT at depths of 100–1000m. This conversion causes differential compaction and shear failure and therefore fault initiation. The location of the earliest faults is dependent on where opal-A to opal-CT conversion and compaction occur first. This is controlled by which strata have a favourable bed composition, local fluid chemistry and temperature or because the strata reach the depth of the reaction front first due to the presence of pre-existing structural relief (folds or faults). Subsidence of biosiliceous sediment through the opal-A to opal-CT reaction front causes fault propagation because of continued localised differential compaction. Fault initiation and propagation due to silica conversion generate polygonal fault arrays at significantly deeper burial depths than previously thought possible.
孔隙水化学对二氧化硅成岩作用的影响：成岩反应带与多边形断层系统相互作用的证据
影响因子：
2.7
作者：
Ireland M
通讯作者：
Ireland M