Provenance of the Upper Jurassic Norphlet and Surrounding Formations from U-Pb Detrital Zircon Geochronology PDF Download
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Author: Andrea Frances Lisi
Publisher:
ISBN:
Category : Haynesville Formation
Languages : en
Pages :
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Author: Andrea Frances Lisi
Publisher:
ISBN:
Category : Haynesville Formation
Languages : en
Pages :
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Author: Thomas R. Lovell
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 178
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Book Description
Detrital zircon U-Pb geochronology and thin-section petrology of core samples taken from onshore Alabama and offshore federal lease blocks, including Destin Dome, Pensacola, and Mobile, constrain sediment provenance for the Upper Jurassic Norphlet Formation in the eastern Gulf of Mexico. Previous research of the Norphlet Fm. in onshore Alabama suggests that sediments near onshore areas of Alabama originated from metamorphic rocks of the Talladega slate belt and Piedmont. This study provides evidence that the Gondwanan Suwannee terrane is another potential source for the Norphlet Fm. in the EGOM. This study determined U-Pb ages for 1111 detrital zircons from 13 Norphlet Fm. core and cutting samples were determined using LA-ICPMS. The Norphlet Fm. yields four major U-Pb age ranges: 197.9 - 350 Ma, 350 - 770 Ma, 800 - 1650 Ma, and 1650 - 3390 Ma. These ages correspond with known U-Pb ages of source terranes common to Laurentia, including the Grenville (950 - 1300 Ma), (Granite-Rhyolite (1350 - 1550 Ma), Yavapai-Matzatzal (1650 - 1750 Ma), Penokean (1800 - 1900 Ma), and Superior Provinces (>2500 Ma). U-Pb ages also reveal sourcing from the Gondwanan Suwannee Terrane (540 - 580 Ma and 2000 - 2200 Ma). This study establishes four geochronologic source terranes: the ancient Appalachian Mountains, the Appalachian foreland basin, Mesozoic rift basins, and the Suwannee Terrane. Ten samples from onshore Alabama yield detrital zircon U-Pb ages characteristic of Laurentian sources (Appalachian mountains and Appalachian foreland basin), whereas two offshore samples yield characteristic Gondwanan (Suwannee Terrane) ages. Four samples located adjacent to the Mesozoic rift basin reveal ages characteristic of both Laurentia and Gondwana - indicating an area of sediment mixing during the late Jurassic. Twelve thin-sections taken from 9 cores in the onshore and state waters areas were point counted for 400 grains each for compositional analysis. Petrolographic analyses reveal plagioclase and potassium feldspars, polycrystalline quartz, metamorphic and volcanic lithic fragments as dominant grain types. Petrologic data corroborate that onshore Alabama samples were sourced by recycled orogenic and cratonic rocks of Laurentia and southern samples were sourced by less mature sources characteristic of a rift basin (Mesozoic rift basins). A paleogeographic reconstruction illustrates sediment being distributed from Laurentian and Gondwanan sources via alluvial, fluvial, eolian, and marine depositional environments.
Author: I. Davison
Publisher: Geological Society of London
ISBN: 1786204940
Category : Science
Languages : en
Pages : 560
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Book Description
This volume brings together 17 comprehensive, data-rich analyses to provide an updated perspective on the Mexican Gulf of Mexico, Florida and northern Caribbean. The papers span a broad range of scales and disciplines from plate tectonic evolution to sub-basin scale analysis. Papers are broadly categorised into three themes: 1) geological evolution of the basins of the southern Gulf of Mexico in Mexico, Bahamas and Florida and their hydrocarbon potential; 2) evolution of the region’s Late Cretaceous to Neogene orogens and subsequent denudation history; and 3) geological evolution of the basins and crustal elements of the northern Caribbean. This book and its extensive data sets are essential for all academic and exploration geoscientists working in this area. Two large wall maps are included as fold-outs.
Author: John W. Snedden
Publisher: Cambridge University Press
ISBN: 110841902X
Category : Business & Economics
Languages : en
Pages : 343
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Book Description
A comprehensive and richly illustrated overview of the Gulf of Mexico Basin, including its reservoirs, source rocks, tectonics and evolution.
Author: Kenneth Carpenter
Publisher: Taylor & Francis
ISBN: 9789056991838
Category : Formations (Geology)
Languages : en
Pages : 570
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Book Description
Author: John R. Foster
Publisher: New Mexico Museum of Natural History and Science
ISBN:
Category : Science
Languages : en
Pages : 257
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Book Description
Author: Charles F. Pepper
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 204
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Book Description
Author: Thomas H. Anderson
Publisher: Geological Society of America
ISBN: 0813725135
Category : Science
Languages : en
Pages : 629
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Book Description
"The objective of this volume is to characterize geologic relationships and settings at the margin of the Laurasia plate from Middle Jurassic to the Early Cretaceous, overlapping the time of the opening of the central Atlantic basin, with the intent of assessing the compatibility of the features with contemporaneous, sinistral fault movement"--Introduction, page v.
Author: Ian A. Walls
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 386
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Author: Matthew William Scott
Publisher:
ISBN:
Category :
Languages : en
Pages :
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This project is a provenance study of Upper Jurassic source and reservoir rocks from the Flemish Pass Basin and Central Ridge, offshore Newfoundland, Canada. It is aimed at adding a new dataset to contribute to our understanding of the geology of this area, where a number of recent hydrocarbon discoveries have been made, but limited geological information is available. A primary goal of the project is to determine the provenance and paleodrainage patterns of the Upper and Lower Kimmeridgian Source Rock and Upper and Lower Tempest Sandstone of the Flemish Pass Basin and the Central Ridge. It is likely that the source rock and reservoir units increase in thickness toward their source terranes and this provenance study would thus help define where thicker sequences of hydrocarbon source rocks and reservoir units are located in the region. In total, sixty samples of both mudstones and sandstones were acquired, processed and analyzed from four wells (Baccalieu I-78, Panther P-52, South Tempest G-88 and Lancaster G-70) to determine provenance. A combination of detrital zircon geochronology, whole rock geochemistry, and heavy mineral proxies were used to decipher provenance. In addition, core logging and thin section descriptions were completed to gain an understanding of the depositional environment. This analysis indicates a basinal setting with sediment being delivered by turbidity currents. The Upper Kimmeridgian Source Rock, Lower Kimmeridgian Source Rock and the Rankin Formation are interpreted to be composed of detritus from the Avalon Zone, Central Mobile Belt, and underlying basement. Detritus would have been derived from the northeast, and thicker sequences of these units would be expected in the northeastern portions of the Flemish Pass Basin and Central Ridge. The Upper Tempest and Lower Tempest Sandstone are also characterized by material from the Avalon Zone. However, some of the detritus from these units is also interpreted to be derived from Iberia to the east. In addition, the Upper Tempest Sandstone contains Mesozoic zircons, which helped constrain the depositional age of this unit. Mesozoic zircons were not found in samples from the other units. The Tempest Sandstone units are interpreted to be derived from the east, which means thicker sequences of this unit would be expected towards the eastern edges of the Central Ridge and Flemish Pass Basin. Knowledge of where the thickest packages of these units exist may be an important consideration for petroleum exploration in the region. In addition to these provenance findings, another important conclusion is that although provenance analysis methods such as detrital zircon geochronology are more common in sandstones, it is evident that using these techniques to analyze fine-grained sedimentary rocks is indeed feasible and useful. Additionally, the detrital zircon distributions in interbedded sandstone and mudstone beds were compared. These distributions suggested provenance of these pairs is very similar, an important implication for future use of this method in mudstones.
