U-Pb Detrital Zircon Geochronology of the Late Paleocene Early Eocene Wilcox Group, East-Central Texas PDF Download
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Author: Preston James Wahl
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Languages : en
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Sediment delivery to Texas and the northwestern Gulf of Mexico during the Early Paleogene represents an initial cycle of tectonic-influenced deposition that corresponds with the timing of late Laramide uplift. Sediments shed from Laramide uplifts to east-central Texas and the northwestern Gulf of Mexico during this time are preserved in strata of the Wilcox Group and lower Claiborne Group. U-Pb dating of detrital zircons from closely spaced stratigraphic units within these groups and the underlying Midway Group by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) reveals the relative arrival time of late Laramide-age detrital zircons to east-central Texas and distinct detrital zircon age assemblages. Comparison of zircon age assemblages from this study with data from potential source regions and additional Wilcox and Claiborne Group samples along the Texas and Louisiana Gulf Coastal Plain provides insight into paleodrainage during the Early Paleogene. The relative arrival time of late Laramide-age detrital zircons to east-central Texas corresponds with deposition of the Hooper Formation of the Wilcox Group, although the presence of these detrital zircons fluctuates within younger samples. Comparison of composite detrital zircon age spectra from sediment source regions and from locations along the Texas and Louisiana Gulf Coastal Plain shows that source regions contain unique distributions of ages, with age components that are similar to Gulf Coastal Plain data. Detrital zircon age data may support relatively similar sediment sources or a similar paleodrainage area for the majority of observed ages within the Midway Group, Wilcox Group, and Carrizo Formation in east-central Texas. Louisiana Wilcox Group and east-central Texas (Tehuacana Member through Carrizo Formation) data are similar and contrast with data of the south Texas Wilcox Group. This may support similar paleodrainage for Louisiana and east-central Texas and a different paleodrainage to the south Texas area. Data may also support the introduction of a new sediment source or a greater contribution of detrital zircons from an already existing source by the time of Queen City Formation (lower Claiborne Group) deposition in east-central Texas. Comparison of Louisiana Claiborne Group data with east-central Texas Queen City Formation data indicates that this source was also available during deposition of younger Claiborne Group strata in Louisiana. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155424
Author: Preston James Wahl
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Languages : en
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Sediment delivery to Texas and the northwestern Gulf of Mexico during the Early Paleogene represents an initial cycle of tectonic-influenced deposition that corresponds with the timing of late Laramide uplift. Sediments shed from Laramide uplifts to east-central Texas and the northwestern Gulf of Mexico during this time are preserved in strata of the Wilcox Group and lower Claiborne Group. U-Pb dating of detrital zircons from closely spaced stratigraphic units within these groups and the underlying Midway Group by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) reveals the relative arrival time of late Laramide-age detrital zircons to east-central Texas and distinct detrital zircon age assemblages. Comparison of zircon age assemblages from this study with data from potential source regions and additional Wilcox and Claiborne Group samples along the Texas and Louisiana Gulf Coastal Plain provides insight into paleodrainage during the Early Paleogene. The relative arrival time of late Laramide-age detrital zircons to east-central Texas corresponds with deposition of the Hooper Formation of the Wilcox Group, although the presence of these detrital zircons fluctuates within younger samples. Comparison of composite detrital zircon age spectra from sediment source regions and from locations along the Texas and Louisiana Gulf Coastal Plain shows that source regions contain unique distributions of ages, with age components that are similar to Gulf Coastal Plain data. Detrital zircon age data may support relatively similar sediment sources or a similar paleodrainage area for the majority of observed ages within the Midway Group, Wilcox Group, and Carrizo Formation in east-central Texas. Louisiana Wilcox Group and east-central Texas (Tehuacana Member through Carrizo Formation) data are similar and contrast with data of the south Texas Wilcox Group. This may support similar paleodrainage for Louisiana and east-central Texas and a different paleodrainage to the south Texas area. Data may also support the introduction of a new sediment source or a greater contribution of detrital zircons from an already existing source by the time of Queen City Formation (lower Claiborne Group) deposition in east-central Texas. Comparison of Louisiana Claiborne Group data with east-central Texas Queen City Formation data indicates that this source was also available during deposition of younger Claiborne Group strata in Louisiana. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155424
Author: Glen Nelson Mackey
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Languages : en
Pages : 310
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Sandstone modal compositions and detrital zircon U-Pb analysis of the Paleocene-Eocene Wilcox Group of the southern Gulf Coast of Texas indicate long-distance sediment transport primarily from volcanic and basement sources to the west, northwest and southwest. The Wilcox Group of south Texas represents the earliest series of major post-Cretaceous pulses of sand deposition along the western margin of the Gulf of Mexico (GoM). Laramide basement uplifts have long been held to be the provenance of the Wilcox Group, implying that initiation of basement uplifts was the driving factor for this transition from carbonate sedimentation to clastic deposition. To determine the provenance of the Wilcox Group and test this conventional hypothesis, 40 thin sections were point-counted using the Gazzi-Dickinson method to determine sandstone composition and 10 detrital zircon samples were analyzed by LA-ICP-MS to determine U-Pb age spectra for each of the sampled areas. Modal data for sand grain populations suggest mixed sources including basement rocks, magmatic arc rocks and subordinate sedimentary rocks for the Wilcox Group. Zircon age spectra for these sandstones reveal a complex grain assemblage derived from older sediments and crystalline rocks ranging in age from Archean to Cenozoic. Sediment was primarily derived from Laramide uplifted crystalline blocks of the central and southern Rocky Mountains, the Cordilleran arc of western North America, and arc related extrusive and intrusive igneous rock of northern Mexico. Comparisons of Upper and Lower Wilcox zircon age spectra show that more arc related material was deposited in the Lower Wilcox, whereas more basement material was deposited in the Upper Wilcox.
Author: María Daniela Muñoz Granados
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Languages : en
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"An integrated analysis of detrital zircon geochronology, clast counting, trace element concentration in zircons and zircon typology was done to get an understanding of the Gualanday Group provenance. Detrital zircon geochronology applied to the Gualanday Group sandstones provide accurate ages of the sources that fed this late Eocene - Paleocene molasse. The main peaks obtained are Precambrian, Jurassic, early and late Cretaceous. Other minor peaks of Triassic and Permian age were also identified. Clast counting gave a consent on which Gualanday Group conglomerate was sampled for this study, which were the Doima (upper) and Chicoral (lower) Formations. The trace element analysis on zircons were applied using REE diagrams, U vs. Yb, U/Yb vs. Hf and U/Yb vs. Y discrimination diagrams. This data, integrated with a typology analysis of the zircons according to their age, gave us crucial information on the type of rock in which the zircon has crystallized in and the sedimentological process that it has been through. The analysis showed that the sources of the Gualanday Group were mainly granitoid. The early Cretaceous sources are discussed and interpreted as Mariquita Stock; late Cretaceous sources are interpreted as Antioquia Batholith; Jurassic as Ibagué Batholith and/or Saldaña formation; Permo-Triassic as anatexis granitoids in Cajamarca Complex, such as Stock del Buey; Precambrian as the redeposited zircons (from the Cretaceous sedimentary cover) that chrystallized in the Greenvillian and Panafrican orogenies and are par of the Guyana Shield and Amazonian Craton. As a result, a palinspastic reconstruction map for the late Eocene - Oligocene is proposed based on the results of this study and from other authors. In this model the tectonic blocks situated west of the Upper Magdalena Valley, in which the Antioquia Batholith is, are in more meridional latitudes."--Tomado del Formato de Documento de Grado.
Author: P. Corbett
Publisher: Geological Society of London
ISBN: 1786204312
Category : Science
Languages : en
Pages : 297
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This volume brings together a number of papers from two workshops with the theme, ‘Rain, Rivers, Reservoirs’, which considered the dynamic changes to river systems as part of natural processes, particularly changing climatic conditions. Bringing researchers from two different locations to Brazil and the UK allowed scientists to contribute to and promote, ‘debate on current research…on how the planet works and how we can live sustainably on it’. This volume features a series of papers on the geoscience of modern and ancient rivers from across the world (Brazil, United States, Spain, Argentina, Canada, India and the UK), their evolution through time, their management, their deposits and their engineering, with both subsurface aquifers/hydrocarbon reservoirs (of Carboniferous, Triassic and Cretaceous age) and surface reservoirs considered.
Author: Gary J. Hunt
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 238
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The distribution of U-Pb ages of detrital zircons from synorogenic Lower Cretaceous (Barremain-Albian) Cedar Mountain and San Pitch formation conglomerates and sandstones (N = 7, n = 641) preserved in the Sevier foreland basin of Utah are statistically related to age spectra of detrital zircons in Jurassic-Neoproterozoic strata (N = 11, n = 1104) in the Cordilleran fold-thrust belt. A history of Sevier thrust-belt unroofing, reworking, and recycling of detritus is recorded in the distribution of detrital zircons in Lower Cretaceous foreland basin strata. Three geochronological provenance intervals are observed in Neoproterozoic-Jurassic strata in the thrust-belt that are also recognized in 3 inverted chronofacies in foreland basin strata. The first provenance interval in the thrust belt is recognized as chronofacies A in the foreland basin. It is defined by a dominant group of Paleoproterozoic detrital zircons and the presence of significant numbers of Late Neoproterozic-Early Paleozoic (550 - 300 Ma) grains. Quartzites and sandstones in the thrust belt in provenance interval 1 include Pennsylvanian-Permain Oquirrh Formation, Permian Diamond Creek Sandstone, and the Jurassic Nugget Sandstone. Statistically related to provenance interval 1 are the oldest foreland basin strata in chronofacies A, including the Buckhorn Conglomerate Member of the Cedar Mountain Formation on the San Rafael Swell, and the Yellow Cat and Poison Strip Sandstone members in eastern Utah. The second provenance is observed in Ordovician-Devonian strata in the Canyon Range thrust sheet, and chronofacies B in the foreland basin; these display mostly Paleoproterozoic detrital zircons with dominant age groups of 1.8-1.9 Ga and 2.2-2.4 Ga. Cedar Mountain Formation conglomerates at the base of the Cretaceous succession in Salina Canyon on the southwestern Wasatch Plateau, and the Short Canyon Conglomerate (Upper Albain) on the western San Rafael Swell, are statistically related to detrital zircon age spectra observed in the Eureka (Ordovician) and Cove Fort (Devonian) quartzites in the thrust-belt. The third provenance interval observed constitutes Neoproterozoic and Cambrian quartzites from the Canyon Range thrust sheet and chronofacies C in the foreland basin, which all produce a tri-modal population of Mesoproterozoic (1.0-1.2 Ga), Paleoproterozoic (1.4 Ga and 1.6-1.8 Ga), and a subordinate population of Archean (>2.5 Ga) grains. Upper Albian conglomerates of the San Pitch Formation produced detrital zircon grains that were derived primarily from the oldest allochthonous strata in the thrust sheet, thus recording the complete unroofing of the thrust-belt in Early Cretaceous time. Abundant Mesozoic detrial zircon grains were sampled in distal Cedar Mountain Formation samples, whereas in more proximal deposits of the Buckhorn Conglomerate on the San Rafael Swell, Cordilleran arc grains are rare. This is due to different sediment dispersal patterns and involves recycling of detrital zircons from reworked Mesozoic strata and perhaps transported directly from Jurassic plutons in the southern Mogollon Highlands. The Buckgorn Conglomerate was deposited by braided transverse rivers with headwaters in the Sevier highlands that produce minimal Triassic-Jurassic detrital zircons, whereas distal deposits of the Yellow Cat and Poison Strip Sandstone members were deposited in a distal axial river system with headwaters in the Mogollon highlands where Triassic-Jurassic zircons are plentiful. Three stages of the early Cretaceous foreland basin in Utah are recognized. An initial stage, which was controlled predominantly by dynamic subsidence, is recognized by the slow deposition of Barremian-Aptian strata of the lower Cedar Mountain Formation (e.g. Buckhorn Conglomerate) with no evidence of a clastic wedge developement to the west. The second stage is the observance of the first westward thickening wedge of sediment recognized in Aptian-Albian Cedar Mountain Formation (Ruby Ranch Member); this indicates that the flexural component of the foreland basin began in Late Aptian or later.The final stage of Early Cretaceous thrust-belt unroofing is recognized with deposition of the San Pitch Formation on proximal axial rivers in an actively subsiding foredeep depozone during latest Albian time.
Author: Leigh Van Drecht
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Languages : en
Pages :
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The Laberge Group consists of synorogenic, marginal-marine to deep-marine strata that were deposited in the Whitehorse trough of central Yukon during the collision of the northern Intermontane terranes along the western Laurentian margin. New detrital zircon U-Pb-Hf data from Laberge Group rock units constrain the Early to Middle Jurassic depositional ages and provenance of Whitehorse trough strata and determine their relationship to the unroofing history of adjacent basement successions. The Whitehorse trough initiated in the Sinemurian as a long, narrow basin that subsequently grew to the west, east, and south by Aalenian time and was sourced by Paleozoic Yukon- Tanana and Stikinia basement rocks and their synorogenic Late Triassic-Early Jurassic plutonic suites. Late Triassic-Middle Jurassic detrital zircon grains from the northern apex of the Whitehorse trough record an excursion to subchondritic Hf(t) values that coincides with the burial of Intermontane terranes and may record crustal thickening proximal to northern regions of the basin.
Author: Paul Karl Link
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Category : Geological time
Languages : en
Pages : 10
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Author: Christopher John Kennedy
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Category : Geology, Stratigraphic
Languages : en
Pages : 90
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The Bossier sands, a natural gas reservoir, are a series of Jurassic stacked sand layers within the Bossier Shale found in the subsurface of East Texas. Detrital zircons were separated from 5 wells. U-Pb or Pb-Pb ages were determined on 393 zircon grains using LA-ICPMS at the University of Arizona. Results revealed two dominant age peaks: 32.5% have Early Neoproterozoic -Middle Mesoproterozoic ages (950-1360 Ma 'Grenville'), and 27% have Pennsylvanian-Ediacaran ages (300-680 Ma 'Ouachita'). Other age peaks include the Jurassic-Permian (150-300 Ma), Early Mesoproterozoic (1360-1500 Ma), Early Mesoproterozoic-Late Paleoproterozoic (1500-1900 Ma), and the Late-Paleoproterozoic or older (>1900 Ma). We conclude that the dominant provenance for the Bossier sands was from local sources in the Ouachita and Grenville orogens. This suggests that flanking crust in Texas, Oklahoma, and Arkansas was high-standing regions during the Jurassic time, shedding detritus into rivers feeding Bossier depocenters.
Author: Cody John Stopka
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Category :
Languages : en
Pages : 500
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The Cordilleran foreland basin is located in the western part of North America and stretches from the Canadian Arctic to parts of southern Mexico and was active from the Late Jurassic to Late Cretaceous. Presented here are U-Pb detrital zircon ages, sandstone modal composition, and paleocurrent measurements from Upper Cretaceous (Cenomanian- Campanian) nonmarine strata of the Dakota Sandstone, Tres Hermanos Formation, and Crevasse Canyon Formation (Lower Member and Ash Canyon Member) located in the southernmost portions of the Sevier foreland basin in southern New Mexico. The Dakota Sandstone is dominated by monocrystalline quartz (84%) with volcanic and metamorphic lithic grains (15%). Paleoflow trends show east-directed (108°) to northeast-directed flow (50°). Detrital zircon age peaks occur at 1732, 1651, 1416, 1050, 626, 412, 230, and 103 Ma. The Tres Hermanos Formation is composed primarily of monocrystalline quartz (63%) with volcanic and metamorphic lithic grains (27%). Paleoflow trends predominantly reflect east-directed (93-109°) and southeast-directed (166°) flow. Peak detrital zircon ages occur at 1709, 1420, 1085, 169, and 94 Ma. The Lower Member of the Crevasse Canyon Formation is composed of monocrystalline quartz (50%) along with volcanic and metamorphic lithic grains (41%). Paleoflow trends show primarily east-directed flow (100°). Detrital zircon age peaks occur at 1702, 1420, 1067, 167, and 91 Ma. The Ash Canyon Member of the Crevasse Canyon Formation is composed of monocrystalline quartz (48%) with volcanic and metamorphic lithic grains (46%). Paleoflow trends show a east- to southeast-directed flow (108-118°). Peak detrital zircon ages were determined to be 1682, 1415, 1108, 169 and 90 Ma. Precambrian to Paleozoic zircons overlap in age with the Yavapai, Mazatzal, Granite-Rhyolite, and Grenville provinces (and age-equivalent ~1.0 Ga rocks), and recycled Neoproterozoic and Early Paleozoic detritus from Mesozoic eolianites of the southwest United States. Permian to Triassic age detritus overlap in age with granitoid rocks that outcrop in California and Arizona. Jurassic to Cretaceous age zircons overlap with the mid-Mesozoic Cordilleran magmatic arc and the Sierra Nevada batholith. Based on the provenance trends summarized above, a sediment dispersal model is favored where the Dakota Sandstone was derived largely from recycled Lower Cretaceous strata of the Bisbee Rift of southeastern Arizona and southwestern New Mexico (present-day Mogollon highlands). Overlying strata of the Tres Hermanos and Crevasse Canyon Formations were sourced primarily from Jurassic-Cretaceous parts of the Cordilleran arc with secondary contributions from recycled strata of the Bisbee Rift and possible the McCoy basin of southern Arizona and southwestern New Mexico.
Author: Eric Edward Baar
Publisher:
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Category : Geology
Languages : en
Pages : 134
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