| 《变质作用与大陆动力学学术讨论会》在北京召开 |
| |
| 引用本文： | 张立飞.《变质作用与大陆动力学学术讨论会》在北京召开[J].岩石学报,1997,13(4):562-562. |
| |
| 作者姓名： | 张立飞 |
| |
| 作者单位： | 北京大学地质学系 |
| |
| 摘 要： | 冲绳海槽火山岩目前发现有玄武岩、玄武安山岩、安山岩、粗面安山岩、粗面英安岩、英安岩和流纹岩。研究表明，冲绳海槽火山岩均属亚碱性系列，基性岩具有拉斑玄武岩系列和钙碱性系列的过渡性，中、酸性岩多属钙碱性系列；岩石形成于上新世以来，大部分都是富集型地幔玄武质岩浆在分离结晶不同阶段的产物。岩石在分离结晶演化趋势上的一致性和在岩石化学指数变异关系上的多样性是原来快速上升未发生混染的岩浆在断裂构造隔离下分枝独立演化的结果。
|
| 关 键 词： | 冲绳海槽 火山岩 岩石化学特征 地质意义 |
The Petrochemical Features of the Volcanic Rocks in Okinawa Trough and Their Geological Significance |
| |
| ZHANG LiFei.The Petrochemical Features of the Volcanic Rocks in Okinawa Trough and Their Geological Significance[J].Acta Petrologica Sinica,1997,13(4):562-562. |
| |
| Authors: | ZHANG LiFei |
| |
| Institution: | Dept. of Geol. Peking University |
| |
| Abstract: | It has been found that volcanic rork in Okinawa Trough includes basalt, basaltic andesite, andesite, trachyandesite, trachydacite, dacite and rhyolite. The studies show that the rocks in Okinawa Trough is of a subalkaline rock series.The basic rocks belong to a transitional form between tholeiite series and calc alkalic series while most of the intermidiate rocks and acid rocks belong to calc alkalic series.They were formed since Policene and at different stages during the fractional crystallization of the initial basaltic magma which originated from the enriched mantle under the bottom.The consistency in the fractional crystallzation devoloping and the variance in the relationships among petrochemical indexes were resulted from the independent evolving stocks of the magma separated by the rift block, which was originally quick rising and non hybridized. |
| |
| Keywords: | Okinawa Trough Volcanic rock Petrochemical features Geological significace |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩石学报》浏览原始摘要信息 |
| 点击此处可从《岩石学报》下载免费的PDF全文 |
