Data Center Description
GEOKEM aims at keeping at hand and referable to within seconds, a brief description of the composition of all volcanic and igneous centres world-wide (and some associated sediments) for which there is reasonable data, together with a regional variation diagram as well as a multi-element fingerprint, REE, metals, the alkaline earth trace elements (Zr, Nb, Sr, Rb, Y, Ba) and other relevant diagrams for single centres. Short descriptions together with fractionation diagrams, comparisons between the different types of basalt known as ORB (Oceanic Ridge Basalt), NMORB, EMORB, OIB, IAB, CAB, (see Glossary for terminology) and other fundamental magma types, graphic comparisons between centres of similar and dissimilar type, and the primary basaltic parental magma trends etc are all shown. It is continuously updated as new data comes to hand. There are still omissions, diagrams not yet done etc due to lack of finance and that ever scarce commodity, time. All data used has been identified by an abbreviated reference, necessarily so, as it must fit in the width of a computer plot. If any data used is missing a reference somewhere in the general text, we welcome communications pointing this out. Completed references to all published data are also to be found in the main databases PETDB and GEOROC and sometimes we show copies of these. We show more than 240 illustrating pix but these are very hard to come by for places we have not visited personally.