Taxonomy term

carbonate

Microbes influence ooid formation

The formation of carbonate spheroids called ooids is a bit of a mystery. They are thought to form in warm waters saturated with carbonate, which combines with calcium to form concentric layers of calcium carbonate on shell fragments or sand grains. Some scientists have suggested that the presence of microbes might encourage calcium carbonate to precipitate out of water to form ooids in a process called organomineralization.

10 Nov 2017

Frosted forams foil radiocarbon dating

Climate studies often rely on radiocarbon dating of tiny shells in seafloor sediments to pinpoint the timing of when warming or cooling events began and ended. But a new study indicates that chemical reactions that take place on the seafloor may affect the accuracy of such radiocarbon dates, with potential implications for the dates published by past studies

01 Nov 2016

Fish guts can alter ocean's chemistry

The ocean’s surface waters contain many more microorganisms than fish — and so for years, the carbonate-shelled microorganisms were thought to be the main contributor to the carbonate chemistry in deep ocean waters. Now, new research suggests that the tiny pellets that most bony fish produce in their guts can affect the chemistry of the oceans.

22 Jan 2009