摘要
高桥玄武质火山岩是一个化学成分独特的富钛基性火山岩。属震旦纪海底喷发的拉斑玄武岩,化学成分以富含TiO_2、MgO、Fe_2O_3+FeO特征。本文通过多方论证后指出:伴生的变辉绿岩属火山颈相,Ti的富集是蚀变作用的结果。
The Ti-ricb basic volcanics at Gaoqiao have unique compositions and it is, in fact, a tholeiite erupted from sea hottom in Sinian preriod. Compositions are characteristic of higher contents of TiO_2. MgO and Fe_2O_3+FeO. After deeper research the author concludes that the meta-diabase associated with the basalt should belong to a diatreme phase and the enricbment of TiO_2 results from the alteration of these rocks.
出处
《湖南地质》
1993年第4期213-216,共4页
Hunan Geology
