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一、浙东南火山岩区的区域地质特征 (一) 火山岩及火山沉积岩本文涉及的仅限于本区广泛分布的晚侏罗世到白垩纪的火山岩和火山沉积岩,既不包括老地层中的火山岩,也不包括新生代的玄武岩。 1.火山岩分为熔岩、火山碎屑岩和它们之间的过渡岩类;就岩性看,有英安岩、安山岩、流纹岩、粗面岩以及相应的熔结
I. Regional Geological Characteristics of Southeastern Zhejiang Volcanic Rocks (I) Volcanic Rocks and Volcanic Sedimentary Rocks This paper deals with volcanic rocks and volcanic sedimentary rocks from the Late Jurassic to the Cretaceous, which are widely distributed in this area. They do not include volcanic rocks in the old formations or Excluding the Cenozoic basalts. 1. Volcanic rocks are divided into lava, pyroclastic rocks and transitional rocks between them; in terms of lithology, there are dacite, andesite, rhyolite, and the corresponding frit