Late cretaceous (Campanian and Maastrichtian) sequence stratigraphy, southeastern North Carolina, USA

UNCW Author/Contributor (non-UNCW co-authors, if there are any, appear on document)
Jessica A. Pierson (Creator)
Institution
The University of North Carolina Wilmington (UNCW )
Web Site: http://library.uncw.edu/
Advisor
William Harris

Abstract: Sequence stratigraphic analysis using samples, geophysical logs, and biostratigraphic data from U.S.G.S. core holes Kure Beach, Hilton Park, and Black Rock Landing identified four partial or complete Late Cretaceous sequences. Sequence 1 (Campanian) is dominated by dirty calcareous sand. Mean sand size is 1.93 f; mean carbonate wt. % is 25.9%. This partial sequence is interpreted as a highstand systems tract (HST). A Type-1 sequence boundary separates Sequence 1 from the next sequence; it is reflected by an irregular surface and the absence of calcareous nannofossil zones CC24 and CC25a. Sequence 2 (Maastrichtian) is characterized in its lower part by clean, fining-upward (1.7 f to 3.4 f) calcareous sand interpreted as a lowstand wedge (LSW). The LSW is overlain by a grainstone followed by calcareous sand with a mean sand size of 2.92 f and a mean wt. % carbonate of 65.2%, interpreted as a transgressive systems tract (TST). The overlying HST is dominated by intercalated muddy carbonate, skeletal grainstone, and mollusk-fragment carbonate sand. Mean sand size is 2 f; mean wt. % carbonate is 39.3%. A Type-2 sequence boundary separates Sequence 2 from the next sequence. Sequence 3 consists of a basal coarsening-upwards calcareous sand that is interpreted as a shelf margin deposit (SMST). Mean sand size is 2.63 f; mean wt. % carbonate is 34.1%. A sharp contact separates the SMST from the overlying TST. Mean grain size fines to 3.12f and mean wt. % carbonate increases to 47.4%. The condensed interval (CI) occurs where sediment size is the finest; no hardgrounds are present. The overlying HST consists of a lower parasequence that shoals upward from muddy to sandy carbonate with evidence of storm winnowing. Mean grain size is 2.64 f; mean wt. % carbonate is 51.8%. The younger parasequence shoals to a sandy, pelecypod-mold grainstone. Mean sand size is 1.64 f; mean wt % carbonate is 56.7 %. A dissolution surface above the grainstone represents the 68 Ma unconformity. The youngest sequence (4) has variable lithology. The Cretaceous parts consist of a nearly pure carbonate overlain by muddy sand. Mean sand size is 2.61 f; mean weight % carbonate is 26.9

Additional Information

Publication
Thesis
A Thesis Submitted to the University of North Carolina Wilmington in Partial Fulfillment of the Requirements for the Degree of Master of Arts
Language: English
Date: 2009
Keywords
Geology--North Carolina--Black Rock Landing, Geology--North Carolina--Hilton Park, Geology--North Carolina--Kure Beach, Geology, Stratigraphic--Cretaceous
Subjects
Geology, Stratigraphic -- Cretaceous
Geology -- North Carolina -- Kure Beach
Geology -- North Carolina -- Hilton Park
Geology -- North Carolina -- Black Rock Landing