...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geofluids >Migration of Mn-rich fluids through normal faults and fine-grained terrigenous sediments during early development of the Neogene Valles-Penedes half-graben (NE Spain)
【24h】

Migration of Mn-rich fluids through normal faults and fine-grained terrigenous sediments during early development of the Neogene Valles-Penedes half-graben (NE Spain)

机译：Neogene Valles-Penedes half-graben的早期发育过程中富锰流体通过正常断层和细粒陆源沉积物的迁移（西班牙东北）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Miocene siliciclastic sediments infilling the Valles-Penedes half-graben are affected by two sets of structures developed during the extensional tectonics that created the basin. The first set, represented by extension fractures infilled with mud and sands, is attributed to seismically induced liquefaction. The second set, represented by normal faults, corresponds to a high-permeability horsetail extensional fracture mesh developed near the surface in the hanging walls of normal faults. The incremental character of the vein-fills indicates episodic changes in the tectonic stress state and fault zone permeability. Two episodes of fluid migration are recorded. The first episode occurred prior to consolidation and lithification when shallow burial conditions allowed oxidizing meteoric waters to flow horizontally through the more porous and permeable sandy layers. Development of clastic dikes allowed local upward flow and dewatering of the sandy beds. Liquefaction and expulsion of fluids were probably driven by seismic shaking. During the first episode of fluid migration there was no cementation of the sandstone or within the fractures, probably because little fluid was mobilized by the predominantly compaction-driven flow regime. The second episode of fluid migration occurred synchronously with normal fault development, during which time the faults acted as fluid conduits. Fluids enriched in manganese, probably leached from local manganese oxyhydroxides soon after sedimentation, moved laterally and produced cementation in the sandstone layers, eventually arriving at the more porous and permeable fault pathways that connected compartments of different porosities and permeabilities. Carbonate probably precipitated in fractures saturated with meteoric water near the ground surface at a transitional redox potential. Once the faults became occluded by calcite cement, shortly after fault development, they became barriers to both vertical and horizontal fluid flow.
机译：填充Valles-Penedes半graben的中新世硅质碎屑沉积物受到形成盆地的伸展构造过程中形成的两组构造的影响。第一组以充填泥土和沙子的延伸裂缝为代表，归因于地震引起的液化。第二组以正常断层为代表，对应于在正常断层的悬挂壁表面附近形成的高渗透性马尾延伸裂缝网。脉状填充物的增量特征表明了构造应力状态和断层带渗透率的周期性变化。记录了两次流体迁移。第一次事件发生在固结和石化之前，当时浅埋葬条件允许氧化的陨石水水平地流经多孔性和渗透性更高的沙层。碎屑堤的发展使砂层局部向上流动并脱水。液体的液化和排出可能是由地震震动驱动的。在第一阶段的流体运移过程中，没有砂岩或裂缝内部的胶结，这可能是因为主要由压实驱动的流动机制动员了很少的流体。第二次流体运移与正常的断层发育同步发生，在此期间断层起着流体导管的作用。富含锰的流体，可能在沉积后不久就从局部羟基氧化锰中浸出，横向移动并在砂岩层中产生胶结作用，最终到达连接更多孔隙度和渗透率隔层的更多孔和渗透率更高的断层通道。碳酸盐可能以过渡氧化还原电势沉淀在地表附近充满陨石水的裂缝中。一旦断层发育后不久，方解石水泥将断层堵塞，它们就成为垂直和水平流体流动的障碍。

著录项

  • 来源
    《Geofluids》 |2009年第4期|p.303-320|共18页
  • 作者

    A. TRAVE; E. ROCA; E. PLAYA; D. PARCERISA; D. GOMEZ-GRAS; J. D. MARTIN-MARTIN;

  • 作者单位

    Departament de Geoquimica, Petrologia i Prospeccio Geologica, Facultat de Geologia, Universitat de Barcelona, Marti i Franques, s, 08028 Barcelona, Spain;

    Departament de Geodindmica i Geofisica, Facultat de Geologia, Universitat de Barcelona, Barcelona, Spain;

    Departament de Geoquimica, Petrologia i Prospeccio Geologica, Facultat de Geologia, Universitat de Barcelona, Barcelona, Spain;

    Dpt. d'Enginyeria Minera i Recursos Naturals, Edifici MN2, EPSEM, UPC Av. Bases de Manresa 61-73, Manresa, Spain;

    Departament de Geologia, Facultat de Ciencies, Universitat Autonoma de Barcelona, Bellaterra, Spain;

    Departament de Geoquimica, Petrologia i Prospeccio Geologica, Facultat de Geologia, Universitat de Barcelona, Barcelona, Spain;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    calcite cement; fluid flow; manganese; Miocene; normal fault; siliciclastic sediment;

    机译：方解石水泥流体流量锰;中新世;正常故障硅质碎屑;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号