TECTONIC AND VOLCANIC EVOLUTION OF PANAREA (AEOLIAN ISLANDS, ITALY)
TECTONIC AND VOLCANIC EVOLUTION OF PANAREA (AEOLIAN ISLANDS, ITALY)
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DOI：
10.1016/0025-3227(90)90011-8
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发表时间：
1990-05-01
期刊：
影响因子：
2.9
通讯作者：
ROSSI, PL
中科院分区：
文献类型：
--
作者：
GABBIANELLI, G;GILLOT, PY;ROSSI, PL
基于新的地球物理、火山学、结构和辐射数据，提供了帕纳雷阿火山大厦海底部分的形态结构重建，并提出了整个综合体演化的模型。帕纳雷阿火山大厦是一个更大的海底大厦的一小部分，其整体形状是一个向东突出的截锥体。锥体底部低于海平面约1500米；它的直径约23公里，面积460平方公里。锥体陡峭的东坡上存在多个裂片，宽阔的海底顶部的形态比以前想象的更为复杂。帕纳雷亚火山群的演化经历了三个阶段：1.(1)在火山群的西段发育了一座中央火山。帕纳雷阿岛代表了这座火山的顶部。2.(2) 火山活动向东移动，导致了该建筑群东半部的裂片发育。3.(3) 建筑群中央部分的大面积破火山口塌陷，塌陷区域内出现了各种性质的圆顶和熔岩体，其中一些是玄武质的。NE-SW 方向的结构似乎发挥了重要作用 在帕纳雷阿火山群的发育过程中。这些结构直到最近才一直活跃，并且具有区域意义。事实上，附近斯特龙博利的演化一直受到北东-西南走向的构造的控制。帕纳雷阿和斯特龙博利也显示出类似的磁异常趋势、地球化学相似性和火山活动的时间关系。
Based on new geophysical, volcanological, structural and radiometric data, a morphological-structural reconstruction of the submarine part of the Panarea volcanic edifice is provided and a model for the evolution of the entire complex is proposed.Panarea is a small part of a much larger submarine edifice whose overall shape is one of a truncated cone with an eastern protrusion. The base of the cone is about 1500 m below sea level; it has a diameter of about 23 km and an area of 460 km2. Several lobes are present on the steep eastern slopes of the cone and the wide submarine top is of a morphology which is more complex than previously thought.The evolution of the Panarea volcanic complex occurred in three stages:1.(1) Development of a central volcano in the western sector of the complex. The island of Panarea represents the top of this volcano.2.(2) Eastward shifting of volcanic activity, producing development of the lobed eastern sector of the complex.3.(3) Extensive caldera collapse of the central part of the complex and emplacement, within the collapsed area, of domes and lava bodies of various affinities, some of which are basaltic.NE-SW oriented structures seem to have had a fundamental role during the development of the Panarea volcanic complex. These structures have been active until recent times and are of regional significance. Indeed, the evolution of nearby Stromboli has been controlled by the NE-SW trending structures. Panarea and Stromboli also display similar magnetic anomaly trends, geochemical affinities, and temporal relationships in volcanism.