Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31443.1 |
Diagenetic controls on the evolution of fault-zone architecture and permeability structure: Implications for episodicity of fault-zone fluid transport in extensional basins | |
Williams, Randolph T.1; Goodwin, Laurel B.1; Mozley, Peter S.2 | |
2017-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN |
ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Diagenesis demonstrably changes both the mechanical and hydrologic properties of sediments. However, the effect of these changes on the distribution and types of structures that develop in fault zones over time, and their impact on fault-zone fluid flow has not previously been systematically investigated. We explored the impact of diagenesis on the mechanical and hydrologic properties of initially unlithified sand cut by a syndepositional normal fault in an extensional basin. Field, microstructural, and geochemical data document a diagenetic record of initially continuous fluid flow through a hanging-wall damage zone up to 10 m wide. In this zone, initial deformation via particulate flow is recorded by a foliation defined by a grain shape preferred orientation, preserved by subsequently precipitated, pore-filling calcite cement. A transition to episodic fluid flow is demonstrated by calcite veins that crosscut the previously cemented, foliated sandstone within relatively narrow (<= 5 m from the fault core) segments of the older damage zone. Unlike the widespread record of particulate flow, veins are restricted to the vicinity of a mapped relay zone between overlapping fault segments, and an inferred, partially covered relay zone. Vein microstructures record repeated fracture opening and sealing. Veins in breccia zones have delta C-13 values as high as +6.0%, suggesting degassing of CO2- and/or CH4 -charged fluids. These data collectively suggest that relatively early damage zone cementation strengthened and stiffened the foliated damage zone, affecting the localization of brittle fractures and fluid flow in relay zones. Our results highlight systematic changes in the character and locus of deformation and fluid flow during the development of normal faults and provide a basis for predicting how these structures may act to trap or transmit fluids during the development of extensional basins. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396813200013 |
WOS关键词 | RIO-GRANDE RIFT ; POORLY LITHIFIED SEDIMENTS ; SHAPE PREFERRED ORIENTATIONS ; CRACK-SEAL MECHANISM ; NEW-MEXICO ; FIBROUS VEINS ; MOAB FAULT ; FLOW ; UTAH ; DISPLACEMENT |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24640 |
专题 | 地球科学 |
作者单位 | 1.Univ Wisconsin Madison, Dept Geosci, Madison, WI 53706 USA; 2.New Mexico Inst Min & Technol, Dept Earth & Environm Sci, Socorro, NM 87801 USA |
推荐引用方式 GB/T 7714 | Williams, Randolph T.,Goodwin, Laurel B.,Mozley, Peter S.. Diagenetic controls on the evolution of fault-zone architecture and permeability structure: Implications for episodicity of fault-zone fluid transport in extensional basins[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Williams, Randolph T.,Goodwin, Laurel B.,&Mozley, Peter S..(2017).Diagenetic controls on the evolution of fault-zone architecture and permeability structure: Implications for episodicity of fault-zone fluid transport in extensional basins.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Williams, Randolph T.,et al."Diagenetic controls on the evolution of fault-zone architecture and permeability structure: Implications for episodicity of fault-zone fluid transport in extensional basins".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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