黑龙江涌泉地区变质基性火山岩中钠质角闪石的成因及演化  

Origin and evolution of sodium amphibolite in metamorphic basic volcanic rocks from Yongquan area of Heilongjiang

作　　者：宋海峰[1] 张兴洲[1] 王跃[1] 冯越华[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061

出　　处：《世界地质》2006年第1期10-15,共6页World Geology

基　　金：国土资源部油气中心大庆外围项目(XQ-2004-07)

摘　　要：根据野外地质特征确定出黑龙江涌泉地区具有洋壳性质的变质基性火山岩由火山熔岩和火山角砾岩两部分组成。这些基性火山岩至少发生了两期高压变质,两期高压变质形成的钠质角闪石具有不同成因。早期的钠质角闪石与岩石片理明显不协调、无方向性、在岩石中不均匀分布,可能是在佳木斯地块与松嫩地块拼合过程中形成;晚期的钠质角闪石构成了现存片理,可能与后期构造变形有关。由于后期变质、变形作用不均匀及火山角砾岩中物质成份的差异,使得部分火山熔岩和火山角砾岩中的角砾及部分胶结物早期高压变质特征得以保留。根据研究区内及相邻地区绿色片岩特征,确定绿色片岩是由经历高压变质的基性火山岩转变而形成。According to the characteristics of metamorphic basic volcanic rocks exposed in Yongquan area, Heilongjiang, it is known that these rocks with oceanic shell nature are composed of volcanic lava and volcanic breccia in type. These basic volcanic rocks underwent high pressure metamorphism for two times, at least, in which sodium amphibolites are formed by high pressure metamorphism with different genesis. It is possible that in the collision of the Jiamusi terrain with the Songnen terrain, those sodium amphibolites incompatible in direction with the foliation of rocks distributing irregularly might be formed in the earlier stage. While, the sodium amphibolites in the later stage compatible with the present foliation, might be related to the structure deformation. Because the metamorphism and deformation in the later stage is nonuniformal,the earlier high pressure metamorphic characteristic in parts of the basic volcanic rocks can be remained. Based on the study of characteristics of green schist in the present area and in the adjacent region, the authors indicate that the green schist is derived from the basic volcanic rocks under the high pressure metamorphism.

关 键 词：高压变质 钠质角闪石 蓝片岩 佳木斯地块 

分 类 号：P588.3[天文地球—岩石学]