摘要
本文应用透射电子显微镜(TEM)详细研究了,中国苏鲁毛北地区金红石榴辉岩中金红石的超微构造特征。在该金红石榴辉岩中发育有两种不同类型的金红石晶体。第一种类型的金红石(Rt(A))与石榴石和绿辉石共生,其晶体内部发育有极密集的晶体缺陷,调制结构和变形双晶。变形双晶面分别为(100)和(010)。表明该类金红石晶体曾遭受过强烈的应力作用,推测它们可能是在大陆板块俯冲或折返过程中形成中发育的。而另一类金红石(Rt(B))存在于石榴石和绿辉石晶体中的包体,其晶格十分完整,没有变形痕迹。可能是由于该类金红石寄主于较大颗粒的石榴石或绿辉石晶体中,在大陆板块俯冲或折返过程中因受到寄住主晶的保护,没有发生晶格畸变。
Detailed TEM investigations present the ultra-fine microscopic textures of rutile in rutile eclogites of Maobei, Su-Lu UHP terrane. There are two types of rutile in investigated samples. One type rutile (Rt ( A)) associates with garnet and omphacite. The dense defects, modulated texture and regular oriented nanometer-size deformed twins are discovered. Two group twins in the rutile are observed which planes parallel to ( 100) and (010) respectively, indicating a strong strain effect on the rutile crystals, and may intimately relate to the subduction, exhumation and subsequent continental collision. The other type rutile ( Rt( B)) is included in the garnets or omphacites. The crystal of later type is well preserved in the host minerals, and has not undergone crystal distortion during exhumation of subducted slab.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第2期399-404,共6页
Acta Petrologica Sinica
基金
科技部973项目:"大陆板块汇聚边界的三维构造格架及大陆深俯冲和折返机制"(2003CB716504)国家基金委面上项目:"微米-纳米级超高压矿物的电子显微学研究(40372024)"中国地质调查局地质大调查项目(编号121201056606)的资助
