BASIC FEATURES AND ORIGIN OF MORTAR LAVAS IN THE GUTIAN-XIWEI AREA, FUJIAN PROVINCE
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摘要: 古田—溪尾地区碎斑熔岩体的形成受北东向基底断裂带控制，具明显水平和垂直分带。由中心到边缘可划分出中酸性、酸性粒状碎斑熔岩，霏细状、隐晶状碎斑熔岩等４种岩石类型，是晚侏罗世火山活动衰亡和火山机构塌陷时期岩浆侵出—溢流相的产物。碎斑熔岩与同期潜花岗斑岩、流纹质晶屑凝灰岩是同源岩浆分异及演化的结果，在空间上构成三相一体的共生组合体。Abstract: The formation of mortar lavas in the Gutian Xiwei area, Fujian, was controlled by the NE trending basement fault zone. They have a distinct vertical zoning extending horizontally. From the center to the borders, four rock types may be distinguished, i.e. intermediate acid and acid granular mortar lavas and acid felsitic cryptocrystalline lavas. They are the product of viscous magma extrusive effusive facies during the decline of Late Jurassic volcanic activity and the collapse of volcanic edifices. Mortar lavas and their synchronous granite porphyry and rhyolitic crystal tuff are the product of comagmatic differentiation and evolution and in space they form a trinity.
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Key words:
- mortar lava /
- mortar texture /
- extrusive effusive facies /
- Fujian province
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