Arid
DOI10.1016/j.sedgeo.2016.03.023
Basement influences on dolomite-hosted vertical sedimentary intrusions in marine erg-margin deposits from the Pennsylvanian of Northern Wyoming (USA)
Blanchard, Sebastien; Frank, Tracy D.; Fielding, Christopher R.
通讯作者Blanchard, Sebastien
来源期刊SEDIMENTARY GEOLOGY
ISSN0037-0738
EISSN1879-0968
出版年2016
卷号339页码:172-187
英文摘要

Understanding soft-sediment deformation structures and their triggers can help in assessing the influence of tectonics, climate, and diagenesis on the stratigraphic record. Such features commonly record processes that would not otherwise be preserved. The description of soft-sediment deformation in Pennsylvanian deposits of the western United States, characterized by orbitally driven alternations between eolian sandstones, marine dolomites, and shales, has been limited to contorted cross-beds. We document discordant sheet-like sedimentary intrusions in three marine intervals over a 45-km-wide area. Intrusions consist of very well to moderately cemented, very fine to fine-grained quartz sandstone. Body widths range from 5 to 50 cm, and heights up to 2 m. The orientations of 103 vertical bodies were measured. Based on upward- and downward-tapering, and the presence of deformed, microfractured fragments of host rocks, these intrusions are interpreted to result from seismically induced fluidization of water-saturated sands. Their sheet-like morphology indicates injection through fractures. Two predominant directions (WNW-ESE and N-S) were recognized and interpreted as pre-injection fracture sets. Folding of surrounding layers around the intrusions suggests negligible compaction prior to injection, indicating penecontemporaneous or shallow burial fluidization. The intraplate location of Wyoming implies that seismicity did not originate at a plate boundary. The area within which intrusions are found is crossed by a zone characterized by localized development of thick eolian stories at the top of the formation, interpreted to reflect the rejuvenation of a basement lineament. The seismically active character of lineaments may explain overpressure and fluidization, substantiating the notion that Precambrian structures repeatedly affected Phanerozoic sedimentation. Similar intrusive features may be wrongly identified or overlooked in deposits of arid environments, but their recognition provides insights into structural context during deposition and burial. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词Injectites Planar sandstone dikes Seismically induced fluidization Eolian sandstones Basement lineament
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000378439100011
WOS关键词POWDER-RIVER BASIN ; DEFORMATION STRUCTURES ; INDUCED LIQUEFACTION ; TENSLEEP SANDSTONE ; CLASTIC DYKES ; BIGHORN BASIN ; PERSIAN-GULF ; LATE MIOCENE ; SEA-LEVEL ; UTAH
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196377
作者单位Univ Nebraska, Dept Earth & Atmospher Sci, 214 Bessey Hall, Lincoln, NE 68588 USA
推荐引用方式
GB/T 7714
Blanchard, Sebastien,Frank, Tracy D.,Fielding, Christopher R.. Basement influences on dolomite-hosted vertical sedimentary intrusions in marine erg-margin deposits from the Pennsylvanian of Northern Wyoming (USA)[J],2016,339:172-187.
APA Blanchard, Sebastien,Frank, Tracy D.,&Fielding, Christopher R..(2016).Basement influences on dolomite-hosted vertical sedimentary intrusions in marine erg-margin deposits from the Pennsylvanian of Northern Wyoming (USA).SEDIMENTARY GEOLOGY,339,172-187.
MLA Blanchard, Sebastien,et al."Basement influences on dolomite-hosted vertical sedimentary intrusions in marine erg-margin deposits from the Pennsylvanian of Northern Wyoming (USA)".SEDIMENTARY GEOLOGY 339(2016):172-187.
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