勉县略阳蛇绿混杂岩带镁铁质安山质火山岩块年龄和该带构造演化的复杂性
Ages of Metamorphic Mafic Andesitic Volcanic Rock Blocks and Tectonic Evolution Complexity of Mianxian Lueyang Ophiolitic M é lange Belt
其中火山岩角块带张性裂缝是油气渗滤的主要通道;
The extensional cracks in volcanic rock unconformity are the main passage for oil infiltration ;