MG/CA VARIATION IN PLANKTONIC FORAMINIFERA TESTS: IMPLICATIONS FOR RECONSTRUCTING PALAEO-SEAWATER TEMPERATURE AND HABITAT MIGRATION
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dc.contributor.author | Eggins S. | |
dc.contributor.author | De Deckker P. | |
dc.contributor.author | Marshall J. | |
dc.date.accessioned | 2021-12-28T06:33:23Z | |
dc.date.available | 2021-12-28T06:33:23Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=4707102 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2003, 212, 3-4, 291-306 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33871 | |
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.subject | MG/CA SEAWATER THERMOMETRY | |
dc.subject | TRACE ELEMENTS | |
dc.subject | LASER ABLATION ICP-MS | |
dc.subject | PLANKTONIC FORAMINIFERA | |
dc.subject | PALAEOCEANOGRAPHY | |
dc.title | MG/CA VARIATION IN PLANKTONIC FORAMINIFERA TESTS: IMPLICATIONS FOR RECONSTRUCTING PALAEO-SEAWATER TEMPERATURE AND HABITAT MIGRATION | |
dc.type | Статья |
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