Mg/Ca variation in planktonic foraminifera tests: implications for reconstructing palaeo-seawater temperature and habitat migration
dc.contributor.author | Eggins, Stephen | |
dc.contributor.author | De Deckker, Patrick | |
dc.contributor.author | Marshall, John | |
dc.date.accessioned | 2015-12-13T23:11:41Z | |
dc.date.available | 2015-12-13T23:11:41Z | |
dc.date.issued | 2003 | |
dc.date.updated | 2015-12-12T08:28:34Z | |
dc.description.abstract | The nature of compositional variability within the tiny calcitic shells (tests) that are precipitated by planktonic foraminifera has been investigated using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Systematic large and correlated variation of Mg/Ca, Mn/Ca, Ba/Ca and Zn/Ca but relatively uniform Sr/Ca are observed through the test walls of analysed species (Globigerinoides sacculifer, Globigerinoides ruber, Neogloboquadrina pachyderma and Neogloboquadrina dutertrei). Distinct chamber and chamber-wall layer compositions can be resolved within individual tests, and Mg/Ca compositional differences observed in sequentially precipitated test components of the different species analysed are consistent with seawater temperature changes occurring with habitat migration during their adult life-cycle stages. Estimated test calcification temperatures are in keeping with available seawater temperature constraints, indicating the potential for accurate seawater temperature reconstruction using LA-ICP-MS. Mg-rich (<1-6 mol% Mg) surface veneers that are also enriched in Mn, Ba, and Zn have been found on all species and all fossil tests, as well as on live-sampled tests of G. ruber, with the latter suggesting a possible biogenic origin. These Mg-rich surfaces bias bulk test compositions toward higher Mg/Ca values by between 5 and 35%. | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | http://hdl.handle.net/1885/87700 | |
dc.publisher | Elsevier | |
dc.source | Earth and Planetary Science Letters | |
dc.subject | Keywords: calcium; chemical composition; magnesium; paleotemperature; planktonic foraminifera; seawater; shell Laser ablation ICP-MS; Mg/Ca seawater thermometry; Palaeoceanography; Planktonic foraminifera; Trace elements | |
dc.title | Mg/Ca variation in planktonic foraminifera tests: implications for reconstructing palaeo-seawater temperature and habitat migration | |
dc.type | Journal article | |
local.bibliographicCitation.lastpage | 306 | |
local.bibliographicCitation.startpage | 291 | |
local.contributor.affiliation | Eggins, Stephen, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | De Deckker, Patrick, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Marshall, John, College of Physical and Mathematical Sciences, ANU | |
local.contributor.authoremail | u9109238@anu.edu.au | |
local.contributor.authoruid | Eggins, Stephen, u9109238 | |
local.contributor.authoruid | De Deckker, Patrick, u8100493 | |
local.contributor.authoruid | Marshall, John, u4018331 | |
local.description.notes | Imported from ARIES | |
local.description.refereed | Yes | |
local.identifier.absfor | 040299 - Geochemistry not elsewhere classified | |
local.identifier.absseo | 970104 - Expanding Knowledge in the Earth Sciences | |
local.identifier.ariespublication | MigratedxPub17091 | |
local.identifier.citationvolume | 212 | |
local.identifier.doi | 10.1016/S0012-821X(03)00283-8 | |
local.identifier.scopusID | 2-s2.0-0041703324 | |
local.identifier.uidSubmittedBy | Migrated | |
local.type.status | Published Version |