黑龙江杂岩蓝片岩—云母片岩矿物成分及变质作用P-T条件  

Mineral Compositions and P-T Conditions of the Blueschist-Mica Schist in Heilongjiang Complex

作　　者：李蓉[1] 孙德有[1] 铃木和博[2] 郑常青[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]名古屋大学年代测定综合研究中心

出　　处：《地球科学（中国地质大学学报）》2013年第2期277-288,共12页Earth Science-Journal of China University of Geosciences

基　　金：国家自然基金项目(No.41172058);中国地质调查局项目(No.1212010070301)

摘　　要：黑龙江构造混杂岩中保留着一套曾遭受过中高压变质作用的岩石,其代表性岩石为:蓝片岩-云母片岩;蓝闪石、铁蓝闪石和多硅白云母(单位结构中Si=3.37～3.46>3.30)等具有中高压性质的典型变质矿物在岩石中平衡共生.蓝片岩-云母片岩组合至少经历了早期和晚期两阶段变质,早期为绿帘蓝片岩相,变质温压条件为T=320～460℃,P=7.8×108～11×108Pa.晚期为高绿片岩相,出现富镁绿泥石(XMg=0.565～0.646)交代早期钠质角闪石和多硅白云母等高压变质矿物现象,变质温度升高而压力有所降低,由石榴石云母片岩所限定的高绿片岩相变质条件为T=536～598℃,P=6.8×108～9.5×108Pa,属中温和中高压变质.A sequence of middle-high-pressure metamorphic rocks occurs in the Heilongjiang Complex, whose representative lithology is blueschist and mica schist. Characteristic minerals of middle-high-pressure metamorphism, such as glaucophane, ferro-glaucophane and phengite （Si=3. 37 to 3.46〉3. 30） are observed in the metamorphic rocks. The rock association, blueschist and mica schist, has suffered at least two stages of metamorphism. The P-T conditions are estimated to be 320 to 460 ℃ and 7.8 × 10^8 to 11 ×10^8 Pa, which correspond to early stage epidote-blueschist facies. The late stage is high-greenschist facies, which is characterized by the replacement of glaucophane and phengite by magnesium-rich （XMg =0. 565 to 0. 646） chlorite. The metamorphic conditions constrained by garnet mica schist are 536-598 ℃ and 6. 8 × 10^8 to 9.5 × 10^8 Pa, consistent with medium temperature and middle-high pressure metamorphism.

关 键 词：蓝片岩 云母片岩 矿物成分 黑龙江杂岩 岩石学 地球化学 

分 类 号：P584[天文地球—岩石学]