RELATIONSHIP BETWEEN ERUPTION VOLUME AND NEODYMIUM ISOTOPIC COMPOSITION AT UNZEN VOLCANO

被引:28
作者
CHEN, CH
DEPAOLO, DJ
NAKADA, S
SHIEH, YN
机构
[1] LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720
[2] ACAD SINICA,INST EARTH SCI,TAIPEI 10764,TAIWAN
[3] KYUSHU UNIV,DEPT EARTH & PLANETARY SCI,FUKUOKA 812,JAPAN
[4] PURDUE UNIV,DEPT EARTH & ATMOSPHER SCI,W LAFAYETTE,IN 47907
关键词
D O I
10.1038/362831a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
SILICA-rich lavas, erupted at island-arc or continental volcanoes, are often produced by a complex process involving the assimilation of crust into a crystallizing, mantle-derived basaltic magma1. The different strontium, neodymium and oxygen isotopic compositions of mantle-derived magmas and continental crust provide a powerful method for tracing the different contributions to continental silicic magmas, and for understanding the parameters controlling the composition and volume of erupted magma1-4. In the large rhyolite eruptive centres of the western United States, the largest-volume, explosive rhyolite eruptions have more mantle-like Nd isotope ratios than other silicic lavas from the same centre2-4, a relationship that has been interpreted as reflecting increased influx of mantle-derived basaltic magma to a crustal magma chamber before large-volume eruptions1. Here we report isotope data for lavas from Unzen volcano, which suggest a similar relationship: the Nd isotope composition is more mantle-like in three larger-volume dacite eruptions (>0.1 km3) than in one small-volume (0.02 km3) eruption. We accordingly suggest that, in small-volume systems like Unzen, where the timescales for magma-chamber evolution are of the order of decades, isotope data such as those presented here might be used in volcanic hazard evaluation.
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页码:831 / 834
页数:4
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