南安第斯中生代构造演化  

MESOZOIC TECTONIC EVOLUTION OF SOUTHERN ANDES

作　　者：任爱军[1] 金庆民[1] 荆福建 梁勇 

机构地区：[1]中国地质科学院南极研究中心

出　　处：《火山地质与矿产》1993年第4期12-26,共15页Volcanology & Mineral Resources

摘　　要：南安第斯中生代构造演化化以形成哈迪(Hardy}弧—洛卡斯维尔德斯(Rocas Verdes)盆体系为主要特征。当地出露的陶比发拉(Tobifera)组、陶凸哈(Tortuga)蛇绿杂岩、亚汗(Yahgan)组和哈迪组分别代表了残余陆缘弧、T型大洋中脊、弧后盆地和岛弧上发育的岩石组合。弧—盆演化过程中,地幔物质底辟上隆造成早期陆缘弧一分为二,其一西移,形成以之为根的新生火山岛弧;另一部分保存于大陆内部,成为形成于分裂陆缘弧内部的弧后盆地火成碎屑的主要源区。盆地形成中期,裂陷深度大,内部出现洋中脊,基性火成岩沿该洋中脊侵位喷发。The main event of Mesozoic tectonic evolution of southern Andes is the formation of Hardy Island-arc-Rocas Verdes back-arc basin system. Exposed there Tobifera Formation, Tortu-ga Ophilitic Complex. Yahgan Formation and Hardy Formation represent, respectively, assemblages formed in residual continental arc, T-type mid-oceanic ridge, back-arc basin and volcanic island -arc. During the evolution of arc -basin system, the diapiric uprise of Mantle materials gave rise to seperation of the early continental are, whose western part migrated westwards and became the base of the newly formed island-are; The other part remained inside continent and became one provenance of pyroclasts for assemblages occurred in the back-arc basin. Along with the evolution of back-arc basin, mid-oceanic ridge formed, basic igneous rocks intruded and erupted nearby.

关 键 词：弧-盆 构造演化 中生代 南安第斯 

分 类 号：P547[天文地球—构造地质学]