id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
xw42n586k0k	Samuel RW Hulett	Boron Abundances and Isotope Systematics of Carbonatites from Worldwide Sources	1904		.txt	text/plain	285	9	33	The origin of carbonatites and their associated alkaline silicate rocks has been linked to metasomatized upper mantle sources and related to mantle plume activity. The latter may be sampled by carbonatite melts associated with mantle plume activity, and their corresponding emplacement ages coincide with major tectonic events in Earth's history; these are linked to episodes of supercontinent formation and consequently significant periods of subduction at a global scale.	cache/xw42n586k0k.txt	txt/xw42n586k0k.txt