Provenance of the Upper Jurassic Norphlet and Surrounding Formations from U-Pb Detrital Zircon Geochronology

Lisi, Andrea F.

doi:10.33915/etd.3614

Cited by 23 publications

(16 citation statements)

References 22 publications

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“…Ultimately, comparing provenance of Triassic-Jurassic syrift deposits with provenance of the Norphlet Formation erg in the northern EGOM as determined through previous work will provide constraints on potential for lower Mesozoic reservoir units across the EGOM (Mancini et al, 1985;Lovell, 2010;Hunt, 2012;Lisi, 2013;Weislogel et al, 2015). Previous exploration success with the Norphlet deep-water play in the EGOM supports the potential for future offshore discoveries.…”

Section: Research Problem Significancementioning

confidence: 76%

“…Detrital zircon U-Pb geochronology from previous work by Lovell (2010), Lisi (2013) and Jessee and Weislogel (2014) identified provenance for eolian facies of the Jurassic Norphlet Formation in the EGOM. Dipmeter interpretation by Hunt (2012) determined a net eolian transport direction of south to southeast towards Florida within the Norphlet dune fields in Alabama, which substantially reworked sediments entering the EGOM sub-basins.…”

Section: Previous Workmentioning

confidence: 77%

“…Samples collected for this study are listed as Basement, Jurassic-Cretaceous, and Wood River. Previous samples collected from the Norphlet and other offshore clastics are also displayed from Lovell (2010) and Lisi (2013). Structures from Neathery and Thomas (1975);Christenson, (1990); Pollastro et al (2001).…”

Section: List Of Figuresmentioning

confidence: 97%

“…Cuttings were prepared for zircon analysis following the methods proposed by Gehrels et al (2014). Separation involved crushing using a disk mill, followed by hydrodynamic separation using a Gemini Lisi (2013) and Lovell (2010) to determine if the Norphlet may have shared a similar source with either basin, and if either basin could be a potential sediment pathway into the EGOM. (Mueller, et al, 1994;Boote and Knapp, 2016).…”

Section: Detrital Zircon Geochronologymentioning

confidence: 99%

“…A map of samples collected from Southern Georgia is displayed in Figure 28. Lovell (2010) and Lisi (2013).…”

Section: South Georgia Rift Detrital Zircon Agesmentioning

confidence: 99%

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Provenance of Syn-rift Clastics in the Eastern Gulf of Mexico: Insight from U-Pb Detrital Zircon Geochronology and Thin Sections

Wiley¹

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zircon geochronology, supplemented by thin section petrography, point counting, and well logs, were used to constrain the provenance of basal Triassic/Jurassic (?) clastic sedimentary rocks in the Eastern Gulf of Mexico (EGOM). Basal clastics were deposited as synrift strata into half grabens present along the EGOM and eastern margin of Laurentia that formed during the initial break up of Pangea. Samples used in this study were collected from the South Florida Basin (SFB) and the South Georgia Rift (SGR). Previous studies of post-rift Jurassic sediment in the Gulf of Mexico has identified a change in source from Laurentian dominated sources in southern Mississippi/Alabama, to Gondwanan dominated sources in the Florida Apalachicola Embayment/offshore. Comparing the provenance of initial syn-rift strata to postrift strata is used to identify initial sediment sources into the EGOM rift basins, and how provenance changed over time. Detrital zircons were collected from five SFB well cutting samples from the Jurassic (?) Wood River Formation and proximal basal sandstones, and six SGR well cutting samples from the Triassic (?) Newark Supergroup, as well as one sample from offshore southern Florida basement. Predominant age populations for the SFB are consistent with a Pan-African origin (525-680 Ma, 1900-2200 Ma). Samples from the SGR are dominated by Laurentian sources (265-330 Ma, 350-420 Ma, 430-490 Ma, 900-1300 Ma), as well as secondary Pan-African sources (525-680 Ma, 1900-2200 Ma). Provenance data is supported by thin section point counting and well logs. Samples in the northern SGR are predominantly derived from Laurentian sources, while the southern samples 3137 and 1854 are a mix of Laurentian and Gondwana signatures. K-S test comparisons of basal sandstones from this study and post-rift Jurassic Norphlet Formation samples from Lovell (2010) and Lisi (2013) show little correlation between samples, implying they do not share similar sources. The exception is the offshore Apalachicola Embayment samples, which indicates that the SGR may have been a potential source for Jurassic sediment in the northern EGOM. The integration of geochronology and petrographic techniques in this study suggests a mix of primarily sedimentary sources from the Suwannee Terranes and metamorphic sources from Laurentia supplied the initial sediment into the EGOM. Results from this study can be used to better constrain tectonic terranes and paleogeography of the early EGOM.

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Section: Research Problem Significancementioning

confidence: 76%

Section: Previous Workmentioning

confidence: 77%

Section: List Of Figuresmentioning

confidence: 97%

Section: Detrital Zircon Geochronologymentioning

confidence: 99%

“…A map of samples collected from Southern Georgia is displayed in Figure 28. Lovell (2010) and Lisi (2013).…”

Section: South Georgia Rift Detrital Zircon Agesmentioning

confidence: 99%