广西南部钦州地区早-中三叠世火山事件--台马碎斑熔岩

The Early-Middle Triassic volcanic event—the Taima porphyroclastic lava in the Qinzhou area,southern Guangxi,China

通过对前人划分的十万大山岩带的主要岩体——台马岩体的野外地质特征、岩石学特征的研究,认为原台马岩体主要由碎斑熔岩组成,是火山侵出相的产物而不是侵入相的花岗斑岩。结合台马碎斑熔岩与周边火山岩、侵入岩、地层的关系,认为它是早—中三叠世中心裂隙式火山构造中央部位侵出的穹状岩脊。因此,十万大山岩带是火山-侵入杂岩带,台马碎斑熔岩是该火山-侵入杂岩带的一个相。

According to the field geological characteristics and petrology of the Taima rock body（now known as Taima rockdome） which is the main body of Shiwandashan rock belt,the authors consider that the Taima rock body consist of porphyroclastic lavas and is an eruptive facies but not an intrusive phases of granite porphyries.Combined with the surrounding volcanic rocks,intrusive rocks and strata,the Taima rock body is considered as a dome of the central part of the central fissure type volcanic structure.Therefore,the Shiwandashan rock belt is a volcanic-intrusive complex rocks belt,and the Taima porphyroclasts lava is one of the phases in that belt.