Calcareous nannoplankton biostratigraphy and paleoclimatic history of the late Neogene sediments of the northwest Florida continental shelf /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
[College Station, Tex.] :
Chen,
1978.
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| Online Access: | Link to OAKTrust copy. Link to ProQuest copy. |
| Abstract: | Two 305 m cores from the northwest Florida shelf have yielded a continuous record of deposition that extends from the Recent back through most of the Late Miocene. Calcerous nannofissils were used to determine the biochronology of the sediment section in the cores, and a detailed analysis of the nannofiossils has also resulted in further refinement of the zonation of the Late Miocene and Pliocene. The sediments consist of a mixture of pelagic carbonates and of clay size terrigenous debris. The carbonate content and coarse fraction percent (chiefly planktonic foraminifers) afford a good measure of changes in the sedimentary regime. They reflect both major changes in the circulation pattern and of eustatic sea level fluctuations. Principal component analysis of the calcareous nannofossil assemglages has yielded information on the nature of changes of the environment in this area. A gradual increase in carbonate content and coarse fraction during the Late Miocene accompanied by a decrease in the amount of dissolution resulted from progressive constriction of the opening between the Caribbean and the Pacific and exclusion of corrosive Pacific subsurface water from the Caribbean Gulf of Mexico. |
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| Item Description: | Vol. 2: chiefly tables. Vita. "Major subject: Oceanography." |
| Physical Description: | 2 volumes (xiii, 464 leaves) : illustrations, graphs ; 28 cm |
| Bibliography: | Includes bibliographical references (v. 1, leaves 165-178). |