Volcanological and petrological evolution of Vulcano island (Aeolian arc, southern Tyrrhenian Sea)

被引:169
作者
DeAstis, G
LaVolpe, L
Peccerillo, A
Civetta, L
机构
[1] UNIV NAPLES FEDERICO II, DIPARTIMENTO GEOFIS & VULCANOL, I-80138 NAPLES, ITALY
[2] UNIV CALABRIA, DIPARTIMENTO SCI TERRA, I-87030 RENDE, CS, ITALY
关键词
D O I
10.1029/96JB03735
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
Petrological and geochemical data are reported for volcanic rocks from Vulcano island. The subaerial volcanism (120 ka to present) built up a NW-SE elongated composite structure, affected by two intersecting multistage calderas. Volcanics older than 20 ka consist mostly of high-K calc-alkaline (HKCA) to shoshonitic (SHO) mafic rocks. These magmas interacted significantly with the continental crust, which generated variable Sr isotopic ratios (0.70412-0.70520). However, a major role was also played by input of parental liquids into the magma chamber, which prevented further evolution of the magmas. HKCA, SHO, and potassic (KS) racks formed from 20 to 8 ka, display a much larger range of SiO2 (from shoshonites to rhyolites) and higher concentrations of incompatible elements with respect to the previous stage. Sr isotopic ratios show small variations (0.70448-0.70486). Mixing of silicic and mafic liquids and fractional crystallization processes (FC) were the main evolutionary processes during this stage. Volcanics younger than 8 ka consist of SHO and leucite-bearing KS mafic rocks, with abundant intermediate and silicic products. Mafic and intermediate rocks display similar incompatible element abundances and Sr isotopic ratios as the previous stage volcanics, whereas higher Sr-87/Sr-86 (0.70494-0.70583) are observed in some rhyolites. These products originated from a complex interplay of FC, crustal assimilation, and magma mixing processes. The most mafic rocks show increasing incompatible element abundances, Rb/Sr, Rb/Ba, Mg/Al, Mg/Ca, and a decrease in large ion lithophile to high field strength element ratios, passing from older HKCA-SHO to the younger SHO-KS volcanics. These variations suggest a shifting of magma sources from a slightly metasomatized asthenosphere (fertile peridotite) to a more strongly metasomatized lithospheric mantle (residual peridotite). Time-related petrological and geochemical variations have been used to develop a model for the evolution of the Vulcano plumbing system.
引用
收藏
页码:8021 / 8050
页数:30
相关论文
共 64 条
[1]  
albarede f, 1995, INTRO GEOCHEMICAL MO, V1st, DOI DOI 10.1017/CBO9780511622960
[2]   THE DEEP SEISMICITY OF THE TYRRHENIAN SEA [J].
ANDERSON, H ;
JACKSON, J .
GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY, 1987, 91 (03) :613-637
[3]  
[Anonymous], 1984, B VOLCANOL, DOI DOI 10.1007/BF01960543
[4]  
[Anonymous], 1982, EARTH EVOL SCI
[5]   ISLAND-ARC MAGMA SOURCES - A GEOCHEMICAL ASSESSMENT OF THE ROLES OF SLAB-DERIVED COMPONENTS AND CRUSTAL CONTAMINATION [J].
ARCULUS, RJ ;
JOHNSON, RW .
GEOCHEMICAL JOURNAL, 1981, 15 (03) :109-133
[6]   SOURCE COMPONENT MIXING IN THE REGIONS OF ARC MAGMA GENERATION [J].
ARCULUS, RJ ;
POWELL, R .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1986, 91 (B6) :5913-5926
[7]  
Aydin A, 1990, ANN TECTONICAE, VIV, P45
[8]   THE DEEP-STRUCTURE OF THE EOLIAN ARC NFILICUDI-PANAREA-VULCANO SECTOR) IN LIGHT OF GRAVITY, MAGNETIC AND VOLCANOLOGICAL DATA [J].
BARBERI, F ;
GANDINO, A ;
GIONCADA, A ;
LATORRE, P ;
SBRANA, A ;
ZENUCCHINI, C .
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, 1994, 61 (3-4) :189-206
[9]  
BARBERI F, 1994, B GEOF TEOR APPL S, V34, P639