Controls on the Genesis of a Giant Sand Injection Complex. Insights on the Palaeogene Evolution of the Stress of Northern and Central California

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
M. Vigorito, A. Grippa, R. H. T. Callow
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引用次数: 0

Abstract

Giant sand injection complexes and localized swarms of sandstone intrusions are common in Upper Cretaceous to Miocene sedimentary successions of the Central and Northern California within a distance of less than 100 km from the Pacific margin of the North America Plate. One of the best preserved and extensively exposed injection complexes is the late Eocene Tumey Giant Injection Complex. The emplacement of sand injectites was driven by overpressure generated by thermal diagenesis of biosiliceous and smectite-rich mudstone host-rocks. The orientation and size distribution of sandstone intrusions was controlled by stress in which σ 1 and σ 3 were horizontal and, respectively, parallel and perpendicular to the present trace of the San Andreas Fault, and σ 2 was vertical. A strike-slip tectonic regime is inferred. Our analysis documents margin orthogonal extension and draws support for a late Eocene phase of increase of strain, and possibly active slip, along a syn-subduction strike-slip fault zone. Comparison with other injection complexes in the region indicates that the near-field maximum principal stress rotated through time, from normal to parallel with respect to the plate margin, probably in relation to variations of the relative motion vector of the converging plates.
对巨型注沙复合体成因的控制。对加利福尼亚北部和中部古近纪应力演变的启示
在加利福尼亚中部和北部距北美板块太平洋边缘不到 100 公里的上白垩统至中新世沉积岩层中,巨型注砂复合体和局部砂岩侵入群十分常见。晚始新世图米巨型喷注岩群是保存最完好、暴露最广泛的喷注岩群之一。砂质喷注岩的形成是由富含生物硅质和软玉质泥岩主岩的热成岩作用产生的超压所驱动的。砂岩侵入体的方向和大小分布受应力控制,其中σ1和σ3为水平应力,分别平行和垂直于圣安德烈亚斯断层的现今走向,σ2为垂直应力。由此推断出一种走向滑动构造机制。我们的分析记录了边缘的正交延伸,并支持晚始新世阶段应变的增加,也可能是沿同步俯冲走向滑动断层带的主动滑动。与该地区其他注入复合区的比较表明,近场最大主应力随着时间的推移发生了旋转,相对于板块边缘从正交变为平行,这可能与会聚板块相对运动矢量的变化有关。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
期刊介绍: ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.
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