GEOCHEMICAL AND SEISMOLOGICAL INVESTIGATIONS AT VULCANO (AEOLIAN ISLANDS) DURING 1978-1989

被引:63
作者
CHIODINI, G
CIONI, R
FALSAPERLA, S
MONTALTO, A
GUIDI, M
MARINI, L
机构
[1] CNR, IST GEOCRONOL & GEOCHIM ISOTOP, I-56127 PISA, ITALY
[2] CNR, IST INT VULCANOL, I-95123 CATANIA, ITALY
[3] GEOTERM ITALIANA SRL, I-56127 PISA, ITALY
关键词
D O I
10.1029/92JB00518
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Both geochemical and geophysical evidence indicates that the activity of the fumarolic system of the Fossa crater can be divided into two periods. From 1978 to 1983, such activity has been mainly controlled by two competing processes which affect the permeability of the fumarolic system at deep levels: (1) rock fracturing induced by faulting and (2) mineral deposition-alteration. The latter, which causes a slow decrease of the permeability at deep levels through clogging of fractures and voids, prevailed at the end of this period, determining a fluid pressure increment in the deep parts of the system. From 1984 to 1989, fluid pressure at deep levels remained persistently high, triggering local microseismic swarms. Furthermore, PT conditions much higher than before were attained in the zones where hydrothermal fluids seep into the conduits from lateral aquifers, owing to an uprising of the isotherms, a deepening of these seeping zones, or both.
引用
收藏
页码:11025 / 11032
页数:8
相关论文
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