http://www.geocean.net/wikituto/ 2026-05-01T00:46:12+00:00 http://www.geocean.net/wikituto/ http://www.geocean.net/wikituto/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2018-03-02T16:43:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://www.geocean.net/wikituto/doku.php?id=xrf:start&rev=1520009032&do=diff Source : Croudace, I.W., Rothwell, R.G. (Eds.), 2015. Micro-XRF Studies of Sediment Cores, Developments in Paleoenvironmental Research. Springer Netherlands, Dordrecht. Calcium (Ca) Origin May be biogenic or detrital, although biogenic sources are volumetrically of far greater importance. Ca as CaCO3 is used as test material for ubiquitous groups of marine plankton, principally foraminifers and coccolithophorids Integral Ca is a recognised proxy for oceanic productivity and Ca variation typic…