Formation and growth of normal faults in carbonates within a compressive environment
Formation and growth of normal faults in carbonates within a compressive environment
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压缩环境下碳酸盐岩正断层的形成和生长
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Aydin
中科院分区：
文献类型：
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作者：
B. Graham;M. Antonellini;A. Aydin
意大利Maiella山前缘白垩纪碳酸盐岩中正断层是通过压溶构造的分级形成及其随后的剪切作用而形成和发育的。通过野外测绘，我们记录了断层的详细结构，其滑动值从几毫米增加到1.50米，并确定了预倾斜构造要素和断层发育的四个阶段，每个阶段都代表了一个新的构造要素的增加。其结果是一个概念模型，开始与预倾斜结构（床平行和床垂直的解决方案表面），重新激活后，在Maiella背斜的前缘倾斜床剪切。滑动机械层边界和床垂直的解决方案的表面上导致倾斜的解决方案的表面，解决方案的表面的链接，和破碎的岩石。相邻机械层中破碎岩石的倾斜带连接形成连续角砾岩，促进断层生长。这些正断层严格地在挤压体制中通过机械作用形成。
Normal faults were initiated and grew through hierarchical formation of pressure-solution structures and their subsequent shearing in Cretaceous carbonates in the leading thrust front of Maiella Mountain, Italy. Through mapping in the field, we have documented the detailed architecture of faults with increasing slip values from a few millimeters to ∼50 m and have identified pretilting structural elements and four stages of fault development, each stage representing addition of a new structural element. The result is a conceptual model that begins with pretilting structures (bed-parallel and bed-perpendicular solution surfaces) that were reactivated in shear upon tilting of the beds at the frontal limb of the Maiella anticline. Slip on mechanical-layer boundaries and on bed-perpendicular solution surfaces resulted in oblique solution surfaces, linkage of solution surfaces, and fragmentation of rock. Oblique zones of fragmented rock in adjacent mechanical layers linked to form a continuous breccia and facilitated fault growth. These normal faults formed through mechanical processes strictly in a compressional regime.