IODP Expedition 334 drilled west of the Costa Rican coast just offshore of the Osa Peninsula with Hole U1381A being the focus for this study. The preservation of the calcareous
nannofossils at this hole ranges from moderate to good, while the total abundance ranges from very rare to very abundant. The nannofossil assemblages fall into two different zones, NN19 of
the Pleistocene and NN5 of the Miocene. There are about 12 million years missing between these two zones. This hiatus is believed to be the result of erosion based on reworked Pliocene
specimens in Pleistocene samples. A scheme by de Kaenel (1999) was used to further subdivide Zone NN19, and it was determined that Core 6H fell into de Kaenel's datum 18. An article by
Anthonissen and Ogg (2012) was used to define Zone NN5 and to determine the relative age. IODP Expedition 352 drilled west of the Izu-Bonin-Mariana system, just east of the fore-arc of the
subduction zone. Hole U1439A is the focus for this study. The preservation of the nannofossils from Cores 5H to 7H ranges from moderate to good while preservation in Cores 9H to 14X ranges
from moderate to poor. The latter is due to an increase in diagenesis below the lysocline where some nannofossils begin to dissolve or become overgrown. The total abundance for all of
these slides ranges from very rare to very abundant, similar to Expedition 334. These slides fall into seven different zones, CN12a, NN14, CN10b, NN11a, NN7, NN6, NN5, and NN3. Anthonissen
and Ogg (2012) was used to define the majority of these zones while Perch-Nielsen (1989) was used for the remainder. The 12 million year hiatus is not observed at this site; only small
intermittent gaps between zones were noted. / A Thesis submitted to the Department of Earth, Ocean, and Atmospheric Sciences in partial fulfillment of the Master of Science. / Fall Semester 2015. / November 9, 2015. / IODP 334, IODP 352, Miocene, nannofossil, Pleistocene / Includes bibliographical references. / Sherwood W. Wise, Jr., Professor Directing Thesis; William Parker, Committee Member; Leroy Odom, Committee Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_291328 |
| Contributors | Power, Margaret M. (authoraut), Wise, Sherwood W. (professor directing thesis), Parker, William C., 1952- (committee member), Odom, A. L. (A. Leroy) (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 |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text |
| Format | 1 online resource (84 pages), computer, application/pdf |
Page generated in 0.002 seconds