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