Assessment of the Oil and Natural Gas Potential of the East Coast Mesozoic Synrift Basins, Onshore and State Waters of the United States

Coleman, James L.; Milici, Robert C.; Post, Paul J.

doi:10.5724/gcs.15.34.0096

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“…The SGR is a buried Triassic-Jurassic graben rift basin system along the southeastern Atlantic margin of the U.S. that has been infilled with Mesozoic sediment and volcanic rocks (Chowns and Williams, 1983). The Newark Supergroup rocks are proven to include hydrocarbon source rocks, although previous exploration attempts have not proved commercial (Milici et al, 2011;Coleman et al, 2015). The general orientation of SGR sub-basins is NE-SW relative to the N-S orientation of other rift basins along the U.S. Atlantic margin, likely due to structural weaknesses of the NE-SW oriented Suwannee suture (Chowns and Williams, 1983;Klitgord et al, 1988;Mueller et al, 2014).…”

Section: Chapter 2: Background Tectonic Setting and Evolution Of The mentioning

confidence: 99%

“…The Tallahassee graben is located in northwest Florida and is likely contiguous with the SGR, and SGR-related extensional basins may extend into the Apalachicola Embayment (MacRae and Watkins, 1993;Hunter, 2014). Previous drilling in the SGR have detected minor gas and oil shows, but no commercial drilling has taken place (Coleman et al, 2015).…”

Section: Introduction Of Research Areamentioning

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: Chapter 2: Background Tectonic Setting and Evolution Of The mentioning

confidence: 99%

Section: Introduction Of Research Areamentioning

confidence: 99%

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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show abstract

Assessment of the Oil and Natural Gas Potential of the East Coast Mesozoic Synrift Basins, Onshore and State Waters of the United States

Cited by 1 publication

References 0 publications

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

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

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