Facies-Architecture Study of A Stepped, Forced Regressvie Compound Incised Valley In the Ferron Notom Delta, Southern Central Utah, U.S.A

详细信息   p://jsedres.geoscienceworld.org/content/83/3/206.full">在线全文   p://jsedres.geoscienceworld.org/content/83/3/206.full.pdf">PDF全文下载

• journal_title：Journal of Sedimentary Research
• Contributor：Yangyang Li ; Janok P. Bhattacharya
• Publisher：SEPM Society for Sedimentary Geology
• Date：2013-03-01
• Format：text/html
• Language：en
• Identifier：10.2110/jsr.2013.19
• journal_abbrev：Journal of Sedimentary Research
• issn：1527-1404
• volume：83
• issue：3
• firstpage：206
• section：Research Articles

摘要

<p id="p-1">Detailed facies-architecture study of a portion of a > 10-kilometer-wide compound incised valley in outcrops of the Turonian Ferron Notom Delta shows three simple incised valleys filled with different facies associations. The valley-fill deposits were mapped with 30 detailed measured sections, photomosaics, and bedding diagrams. The oldest, incised valley 3, forms a terrace deposit that erodes directly into hummocky-cross-bedded lower-shoreface deposits. It is filled with fine- to medium-grained tidally influenced deposits, characterized by abundant mud-draped cross beds, sparse burrowing, and a bimodal paleocurrent-direction pattern. The younger incised valley 2 locally cuts through the valley 3 terrace and also into the lower-shoreface deposits. The valley 2 fill comprises multi-story medium-grained fluvial deposits with minor finer-grained tidally influenced fluvial deposits in the upper 10%. The youngest, incised valley 1, also locally cuts into the lower-shoreface deposits, removing the terraces formed by valleys 2 and 3. Valley 1 is filled entirely with medium-grained fluvial deposits. The composite valley fill records generally increasing fluvial dominance and decreasing tidal influence during successive cut-and-fill episodes associated with each simple valley fill. It is hypothesized to correlate with a longer-term, stepped relative fall of sea level, punctuated by standstills, or minor rises of sea level. p>