Abstract
Basaltic rocks from Daikonjima, a young shield volcano in Nakaumi Lagoon (eastern Shimane Prefecture), have been dated and analysed for a range of whole-rock major, trace element, and isotope data. K/Ar age data indicate a Quaternary eruption age of circa 200 000 years. Chemical data for a range of stratigraphically controlled samples show that they are all fractionated relative to basaltic primary liquids (100 Mg/(Mg+Fe)∼56, Ni 101-160 ppm, Cr 110-226 ppm). In terms of Sr and Nd isotopes, they represent a homogenous reservoir close to bulk earth values. The earliest magma results from a lower degree of partial melting than later magma batches, and variations in chemistry between younger lava flows can probably be attributed to small differences in modal mineralogy, although the possibility of limited crustal contamination cannot be excluded.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
