TY - JOUR
AU - Gill, James
AB - Available geochemical and field data suggest that three different periods of igneous activity have occurred on Viti Levu. Rocks of the first period are “island arc tholeiites”; of the second, a calc-alkaline series; and of the third, shoshonites. Each period has a geochemical distinctiveness. The temporal sequence also corresponds to a spatial zonation analogous to that observed in many currently active island arcs. K2O and the larger trace elements increase south to north and with time, whereas iron enrichment and Na2O/K2O ratios decrease. Initial Sr 87/86 ratios average about 0.7041 in rocks of all periods. If Viti Levu magmas were genetically related to underthrust oceanic crust, as is argued for comparable ones of modern island arcs, then the island must have drifted or been rotated to its present position within the last 5–10 m.y.
TI - Geochemistry of Viti Levu, Fiji, and its evolution as an island arc
JF - Contributions to Mineralogy and Petrology
DO - 10.1007/BF00385777
DA - 2004-09-13
UR - https://www.deepdyve.com/lp/springer-journals/geochemistry-of-viti-levu-fiji-and-its-evolution-as-an-island-arc-HA9QNvTxhk
SP - 179
EP - 203
VL - 27
IS - 3
DP - DeepDyve
ER -