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酸性火成岩,尤其是酸性火山岩、次火山岩及浅成岩中各种过渡类型的结构特别多,对生成条件的反映亦比较灵敏。例如华南许多地方(浙江桐庐,临安—胃化;江西抚州至乐安的玉华山、桐山;福建古田,龙溪、闽清、德化石牛山、南靖梅林;湘粤边界的天鹅寨等)的次火山相或侵出相出露的流纹质—流纹英安质岩体中,从岩体的边缘到岩体中心,岩石基质中矿物颗粒逐渐变粗,其结构也具规律的变化。以浙江桐庐的自碎二长花岗斑岩为例,其外围的流纹质晶屑凝灰熔岩的基质具霏细结构(图版Ⅱ—1),向岩体内部逐渐变为包含霏细结构(图版Ⅱ—2),包含微晶结构,其中心(岩石由流纹英安质熔岩相变为自碎二长
Acidic igneous rocks, especially acidic volcanic rocks, sub-volcanic rocks and diagenetic rocks in various transitional types of structure is particularly large, the reaction conditions are also more sensitive. For example, many places in southern China (Zhejiang Tonglu, Lin’an - Gasification; Jiangxi Fuzhou to Le An Yuhua Mountain, Kiriyama; Fujian Furuta, Longxi, Minqing, Dehua Niushan, Nanjing Merlin; In the secondary rhyolitic or intrusive rhyolitic-rhyolite quartzite bodies, the mineral grains in the rock matrix gradually become coarse and their structures change regularly, from the edge of the rock mass to the center of the rock mass. Taking the self-fractured monzonitic granite porphyry in Tonglu, Zhejiang Province as an example, the matrix of rhyolite crystalline tuff ash lava in the periphery is fine structure (Plate Ⅱ-1) (Plate II-2), contains a microcrystalline structure, the center of which (the rock is changed from rhyolite amphibolite to self-crushing