eprintid: 10076952 rev_number: 27 eprint_status: archive userid: 608 dir: disk0/10/07/69/52 datestamp: 2019-09-23 11:59:59 lastmod: 2020-02-12 17:58:15 status_changed: 2019-09-23 11:59:59 type: article metadata_visibility: show creators_name: Drury, AJ creators_name: Lee, GP creators_name: Pennock, GM creators_name: John, CM title: Data report: late Miocene to early Pliocene coccolithophore and foraminiferal preservation at Site U1338 from scanning electron microscopy ispublished: pub divisions: UCL divisions: A01 divisions: B04 divisions: C06 divisions: F57 keywords: IODP, Late Miocene, early Pliocene, SEM, Preservation, foraminifera, IODP Site U1338 note: © IODP JRSO. This work is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/). abstract: The late Miocene to early Pliocene carbonate-rich sediments recovered at Integrated Ocean Drilling Program (IODP) Site U1338 during the Expedition 320/321 Pacific Equatorial Age Transect (PEAT) program contain abundant calcareous nanno- and microfossils. Geochemical proxies from benthic and planktonic foraminiferal and coccolithophore calcite could be very useful at this location; however, good preservation of the calcite is crucial for the proxies to be robust. Here, we evaluate the preservation of specific benthic and planktonic foraminifer species and coccolithophores in fine fraction sediment at Site U1338 using backscattered electron (topography mode) scanning electron microscopy (BSE-TOPO SEM). Both investigated foraminiferal species, Cibicidoides mundulus and Globigerinoides sacculifer, have undergone some alteration. The C. mundulus show minor evidence for dissolution, and only some specimens show evidence of overgrowth. The Gs. sacculifer show definite signs of alteration and exhibit variable preservation, ranging from fair to poor; some specimens show minor overgrowth and internal recrystallization but retain original features such as pores, spine pits, and internal test-wall growth structure, whereas in other specimens the recrystallization and overgrowth disguise many of the original features. Secondary electron and BSE-TOPO SEM images show that coccolith calcite preservation is moderate or moderate to poor. Slight to moderate etching has removed central heterococcolith features, and a small amount of secondary overgrowth is also visible. Energy dispersive spectroscopy analyses indicate that the main sedimentary components of the fine fraction sediment are biogenic CaCO_{3} and SiO_{2}, with some marine barite. Based on the investigations in this data report, geochemical analyses on benthic foraminifers are unlikely to be affected by preservation, although geochemical analyses on the planktonic foraminifers should be treated cautiously because of the fair to poor and highly variable preservation. date: 2014-10-15 date_type: published publisher: Integrated Ocean Drilling Program official_url: http://dx.doi.org/10.2204/iodp.proc.320321.218.2014 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green article_type_text: Journal Article verified: verified_manual elements_id: 1667785 doi: 10.2204/iodp.proc.320321.218.2014 language_elements: English lyricists_name: Drury, Anna Joy lyricists_id: AJDRU10 actors_name: Drury, Anna Joy actors_id: AJDRU10 actors_role: owner full_text_status: public publication: Proceedings of the Integrated Ocean Drilling Program volume: 320/32 pagerange: 1-14 issn: 1930-1014 editors_name: Pälike, H editors_name: Lyle, M editors_name: Nishi, H editors_name: Raffi, I editors_name: Gamage, K editors_name: Klaus, A citation: Drury, AJ; Lee, GP; Pennock, GM; John, CM; (2014) Data report: late Miocene to early Pliocene coccolithophore and foraminiferal preservation at Site U1338 from scanning electron microscopy. Proceedings of the Integrated Ocean Drilling Program , 320/32 pp. 1-14. 10.2204/iodp.proc.320321.218.2014 <https://doi.org/10.2204/iodp.proc.320321.218.2014>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10076952/7/Drury_Data%20report.%20late%20Miocene%20to%20early%20Pliocene%20coccolithophore%20and%20foraminiferal%20preservation%20at%20Site%20U1338%20from%20scanning%20electron%20microscopy_VoR.pdf