浙东南中生代酸性岩浆的形成与喷发

浙江东南部中生代酸性火山岩其成因类型为同熔型岩类;岩浆起源于成分为安山质的中下地壳(16-25km)的部分熔融,属古老大陆变质基底构造活化的产物。在弱挤压—弱拉张这样的总体构造背景下,因火山喷发之岩浆房的深度。过饱和水含量等物理化学因素的变化,从而导致不同旋回甚或同一旋回的火山产物在产状、组份、结构构造等发生变化。

GENERATION AND ERUPTION OF MESOZOIC ACIDIC MAGMA IN SOUTHEAST ZHEJIANG

This paper consider that Mcsozoic volcanic rocks of the southeastern Zhejiang is of syntectic series which generated by partial melting of the middle to lower crust (16 to 25 km) that have andesitic composition. It is a product of tectonic mobilization of the ancient continental metamorphic basements. Basic magmas derived from the mantle provided only heat source and no material for formation of the acidic magmas. Under general tectonic setting of weak compression to weak extension, difference of depth and water content of eruptive magma chambers resulted in variation of volcanic product in occurrence, scale, component and structure between different cycles or within same cycle .