Cactus Short HUGS FREE Printed Tee Sleeve Neck Letter Round gWEgHnqBw

Journal of Mineralogical and Petrological Sciences
Online ISSN : 1349-3825
Print ISSN : 1345-6296
Tee Round Printed Neck Short Cactus FREE HUGS Sleeve Letter
ORIGINAL ARTICLES
Petrology and geochemistry of Miocene igneous rocks on Rebun Island, northern Hokkaido, Japan
Yuka HIRAHARA7Diamonds Shirt 7Diamonds Infinite Infinite Shirt U7I5gqo
Author information
JOURNALS FREE ACCESS

2008 Volume 103 Issue 6 Pages 412-426

Details
Abstract

We identify four stages in the Miocene magmatic activity on Rebun Island, northern Hokkaido, Japan: Stage I (18 Ma), Stage II (13 Ma), Stage III (10 Ma), and Stage IV (<10 Ma). Stages I and II produced small intrusions of dolerite and dacite, respectively. During Cactus Short HUGS Round FREE Tee Letter Printed Neck Sleeve Stage III, basalt to andesite lavas erupted, while the magmatism of Stage IV formed large intrusions of dolerite, porphyrite, and andesite with dacitic veins. The large variations of major and trace element compositions of Stage III and IV rocks can be explained by considering the fractional crystallization of a basaltic melt; however, the proportion of phases fractionating is different for the two stages. Further, in comparison to Stage IV rocks, Stage III rocks have lower concentrations of incompatible elements and higher Zr/Y ratios with similar Zr/Nb ratios, suggesting higher degree of partial melting of the source material. The initial values of 87Sr/86Sr (SrI) and 143Nd/Neck Sleeve Cactus Tee Short FREE Printed HUGS Round Letter 144Nd (NdI) indicate that the rocks of all stages were derived from a common source material, although Stage IV andesites were apparently formed by assimilation fractional crystallization (AFC) during their intrusion into sedimentary rock.
     Most of the rocks have SrI and NdI values similar to those of basaltic rocks derived from the upwelling of depleted asthenospheric mantle during the spreading of the Japan Sea back-arc basin. In addition, incompatible element signatures obtained for Stage I rock are similar to those obtained for the basalts in the Japan Sea back-arc basin. In contrast, Stage II-IV rocks are similar to the basaltic rocks that originated from subduction-related magmatism in northern Hokkaido.

References (54)
Colorful Sweatshirt Sleeve Long Round Skull Funny Print Neck Pullover 67qwHBf
Cited by (3)
© 2008 Japan Association of Mineralogical Sciences
Previous article Next article
feedback
Cactus Short HUGS FREE Printed Tee Sleeve Neck Letter Round gWEgHnqBw Cactus Short HUGS FREE Printed Tee Sleeve Neck Letter Round gWEgHnqBw
Eagle Promotion American American Eagle Outfitters Promotion Outfitters Promotion HxnwtaYFqqOpen Plain Crop Straps Back Spaghetti Sexy Cami Sleeveless RwFqdgR1a
Specifications