Synchrotron X-ray microscopy of marine calcifiers: how plankton record past climate change

Redfern, S. A. T. and Branson, O. and Read, E. (2017) Synchrotron X-ray microscopy of marine calcifiers: how plankton record past climate change. Journal of Physics: Conference Series, 849. 012011. ISSN 1742-6588 DOI

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We have used STXM and PEEM to reveal the underpinning chemistry and nanoscale structure behind palaeo-climate geochemical signatures, such as trace Mg in shells- proposed proxies for palaeo-ocean temperature. This has allowed us to test the chemical assumptions and mechanisms underpinning the use of such empirical proxies. We have determined the control on driving chemical variations in biogenic carbonates using STXM at the absorption edge of Mg, B, and Na in the shells of modern plankton. The power of these observations lies in their ability to link changes in chemistry, microstructure, and growth process in biogenic carbonate to environmental influences. We have seen that such changes occur at length scales of tens of nanometres and demonstrated that STXM provides an invaluable route to understanding chemical environment and key heterogeneity at the appropriate length scale. This new understanding provides new routes for future measurements of past climate variation in the sea floor fossil record.

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA72;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: Journal of Physics: Conference Series
Volume: 849
Page Range: 012011
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 23 Jun 2017 12:55
Last Modified: 04 Aug 2017 11:32

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