Sequence stratigraphic analysis of marginal marine sabkha facies : Entrada Sandstone, Four Corners region

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Sequence stratigraphic analysis of marginal marine sabkha facies : Entrada Sandstone, Four Corners region

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dc.contributor.advisor Kocurek, Gary
dc.creator Makechnie, Glenn Kenneth
dc.date.accessioned 2010-12-23T15:59:19Z
dc.date.accessioned 2010-12-23T15:59:27Z
dc.date.available 2010-12-23T15:59:19Z
dc.date.available 2010-12-23T15:59:27Z
dc.date.created 2010-08
dc.date.issued 2010-12-23
dc.date.submitted August 2010
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2010-08-1678
dc.description.abstract The Middle Jurassic Entrada Sandstone of the Four Corners region, USA, is composed predominantly of very fine-grained, red, silty sandstone with poorly defined sedimentary structures. The origin of this facies is enigmatic, even though it is common both on the Colorado Plateau and globally, and is spatially situated between deposits recording unambiguous marine and aeolian environments. Eleven sections were measured along an 85 km transect from the Blanding Basin in southeastern Utah to the San Juan Basin in northwestern New Mexico. Outcrop and laboratory analyses distinguish eight facies: (1) silty shale, (2) shallow subaqueous reworked, fine- to medium-grained sandstone, (3) brecciated, very fine-grained sandstone, (4) crinkly laminated, very fine-grained sandstone with preserved wind ripples and abundant silty laminae, (5) weakly laminated, fine-grained sandstone with occasional silty laminae, (6) planar-laminated, fine-grained, wind-rippled sandstone, (7) cross-stratified, fine- to medium-grained aeolian cross-stratified sandstone, and (8) micritic limestone. Lateral and vertical relationships of these facies show a proximal to distal transition from cross-bedded wind-lain facies to loess-dominated sabkha facies with increasing abundance of water-lain facies basinward. The well known Todilto Limestone (facies 8) is situated stratigraphically below loess-dominated sabkha facies (facies 4 and 5) within the Entrada Sandstone, reinforcing previous interpretations that the unit represents a catastrophic flooding event and not a local groundwater flux.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Entrada
dc.subject Sequence stratigraphy
dc.subject Facies
dc.subject Jurassic
dc.subject Aeolian
dc.subject Sabkha
dc.subject Sandstone
dc.subject Stratigraphic analysis
dc.subject Four Corners
dc.title Sequence stratigraphic analysis of marginal marine sabkha facies : Entrada Sandstone, Four Corners region
dc.date.updated 2010-12-23T15:59:28Z
dc.contributor.committeeMember Mohrig, Davis
dc.contributor.committeeMember Steel, Ronald
dc.description.department Geological Sciences
dc.type.genre thesis
dc.type.material text
thesis.degree.department Geological Sciences
thesis.degree.discipline Geological Sciences
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Masters
thesis.degree.name Master of Science in Geological Sciences

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