摘要
碧溪岭和双河地区是大别超高压地体内2个典型的露头区,通过野外露头观察、岩相学和岩石化学研究发现,岩石组合主要为榴辉岩、斜长角闪岩、片麻岩和面理化花岗岩。榴辉岩具有壳源的特点,是地壳岩石在地幔深处发生超高压变质作用形成的;斜长角闪岩为板块折返期间榴辉岩的退变质产物;片麻岩为斜长角闪岩在折返过程中在合适的环境下深熔递进演变的产物;而面理化花岗岩是片麻岩部分熔融的结果。榴辉岩与片麻岩和面理化花岗岩之间为经过改造的原地关系。
Bixiling and Shuanghe are two typical outcrop areas in the Dabie ultrahigh-pressure (UHP) metamorphic terrane. Based on field outcrop observations and petrographic and petrochemical studies, the authors find that the rock association consists predominantly of eclogite, amphibolite, gneiss and foliated garnet-bearing granite. Eclogite has the characteristics of the crustal source and is considered to form by UHP metamorphism crustal rocks in the deep interior of the mantle; amphibolite is the product of retrogressive metamorphism of eclogites during exhumation of the plate; gneiss was produced by anatexis and progressive evolution of amphibolite in an ideal environment during exhumation; and foliated garnet-bearing granite is the result of partial melting of gneiss. In conclusion, there is a reworked 'in-situ' relationship between eclogite and gneiss (and/or foliated garnet-bearing granite).
出处
《地质通报》
CAS
CSCD
北大核心
2004年第12期1246-1253,共8页
Geological Bulletin of China
基金
国家重点基础发展项目(G1999075506)
国家自然科学基金(40372094
40073005)
中国地质大学穴武汉雪优秀青年教师资助计划项目部分成果。
关键词
超高压变质地体
岩石组合
演化
大别山
UHP metamorphic terrane
rock association
evolution
Dabie Mountains
