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dc.creatorVan Yperen, Anna E.
dc.creatorHolbrook, John M.
dc.creatorPoyatos-Moré, Miquel
dc.creatorMidtkandal, Ivar
dc.description.abstractLow-accommodation deltaic systems are often challenging to interpret due to their condensed, low-gradient nature, which often results in extensive, sheet-like sandstone bodies. As a result, detailed studies of such systems are scarce, and their internal depositional architecture is still poorly understood. We analyze one such system, the Cenomanian deltaic Mesa Rica Sandstone (Dakota Group), which was deposited in the Western Interior Seaway, in east-central New Mexico, USA. A > 20-km-long escarpment, subparallel to the main delta progradation direction, allows a detailed analysis of facies distribution, depositional architecture, and the spatial extent of stratigraphic surfaces. Results reveal an arrangement of laterally variable shallowing-upward facies successions with three depositional cycles preserved. The first cycle is characterized by deltaic sheet-like sandstone bodies that are consistently overlain by sand-filled amalgamated distributary-channel deposits. The two successive cycles record a progressive reduction of sediment supply into the basin. Vertical and lateral relationships between facies associations and architectural geometries allow the recognition of regional key stratal surfaces, incised-valley fills, and the presence of lagoonal deposits at a sub-regional scale. The Mesa Rica deltaic system represents a river-dominated delta with multiple distributary channels. The sheet-like delta-front sandstone bodies are interpreted as the result of the combined effect of high sandy-sediment supply and low accommodation. The latter acted as an accelerator for autogenic depositional mechanisms such as mouth-bar deposition and abandonment, and for the highly avulsive character of distributary channels. After deposition, minor wave reworking facilitated lateral sand redistribution and favored bioturbation. This study demonstrates that sheet-like delta-front sandstone geometries from low-accommodation systems can be formed without the dominance of wave redistribution processes. This cautions against interpretations of amalgamated shoreline systems based solely on apparent sandstone geometries, without taking into account the preservation potential and postdepositional modification of primary deltaic characteristics.en_US
dc.sourceJournal of Sedimentary Research
dc.subjectclastic rocksen_US
dc.subjectcoastal environmenten_US
dc.subjectCretaceous cross-stratificationen_US
dc.subjectdeltaic environmenten_US
dc.subjectdepositional environmenten_US
dc.subjectfluvial environmenten_US
dc.subjectlagoonal environmenten_US
dc.subjectLower Cretaceousen_US
dc.subjectMesa Rica Sandstoneen_US
dc.subjectNew Mexicoen_US
dc.subjectNorth Americaen_US
dc.subjectplanar bedding structuresen_US
dc.subjectQuay County New Mexicoen_US
dc.subjectripple drift-cross laminationsen_US
dc.subjectsedimentary rocksen_US
dc.subjectsedimentary structuresen_US
dc.subjectUnited Statesen_US
dc.subjectUpper Cretaceousen_US
dc.subjectWestern Interioren_US
dc.subjectWestern Interior Seawayen_US
dc.subjectDakota Groupen_US
dc.titleCoalesced Delta-front Sheet-like Sandstone Bodies from Highly Avulsive Distributary Channels: The Low-accommodation Mesa Rica Sandstone (Dakota Group, New Mexico, U.S.A.)en_US
dc.rights.holderAnna E. Van Yperen et al.
dc.rights.licenseCC BY 4.0
local.collegeCollege of Science and Engineering
local.departmentGeological Sciences
local.personsHolbrook (GEOL)

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