The present study deals with the stratigraphy and petrography of the Upper Cretaceous through Paleocene carbonate sequence obtained from a deep well located in Polk County, Florida. Subsurface stratigraphy was measured and described at one locality from a deep well drilled nearly 8,000 ft (~2,438 m). Based on previous studies and lithologic changes that observed under stereo and petrographic microscope, the studied interval is stratigraphically subdivided into three formations. This study spans a 3400-5700 ft (~1,036-2,193 m) interval encompassing Upper Cretaceous Pine Key and Lawson formations and the Paleocene Cedar Keys Formation. Petrographic investigation of the selected sequence led to identification of lithostratigraphy, depositional environment and diagenetic history of Upper Cretaceous-Paleocene rocks. This study revealed that approximately 1,000 ft (~305 m) of a carbonate-evaporite sequence (mainly dolostone and small portions of limestone) are within the Cedar Keys Formation (3,400-4,400 ft [~1,036-1,341 m]), almost 700 ft (~213 m) white to tan limestone that includes dolomitized portions and small amount of anhydrite belongs to the Lawson Formation (4,400-5,100 ft [~1,341- 1,555 m]), and 600 ft (~183 m) white chalky limestone is from the Pine Key Formation (5,100-5,700 ft [~1,555- 1,737 m]). A number of microfacies were recognized in thin sections representing shallow subtidal to intertidal depositional environments of Lawson Formation and shallow subtidal to supratidal depositional environments of Cedar Keys Formation. Thin section analysis revealed that the Lawson and Cedar Keys formations have a complex diagenetic history that is characterized by several diagenetic features such as micritization, cementation, dissolution, dolomitization, and recrystallization. These complex diagenetic features took place under marine, mixed-marine and fresh water as well as fresh water environments. The Upper Cretaceous Lawson Formation represents a general transgressive to regressive cycle in sea-level while the Cedar Keys Formation indicates more restricted marine environment representing lower sea-levels and multiple transgressive and regressive cycles. / A Thesis submitted to the Department of Earth, Ocean, and Atmospheric Science in partial fulfillment of the requirements for the degree of Master of Science. / Summer Semester 2015. / July 13, 2015. / Includes bibliographical references. / William Parker, Professor Directing Thesis; Seth Young, Committee Member; Yang Wang, Committee Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_253124 |
| Contributors | Ozakar, Ekin (authoraut), Parker, William C., 1952- (professor directing thesis), Young, Seth Allen, 1978- (committee member), Wang, Yang (committee member), Florida State University (degree granting institution), College of Arts and Sciences (degree granting college), Department of Earth, Ocean, and Atmospheric Science (degree granting department) |
| Publisher | Florida State University, Florida State University |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text |
| Format | 1 online resource (105 pages), computer, application/pdf |
| Rights | This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). The copyright in theses and dissertations completed at Florida State University is held by the students who author them. |
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