摘要
概述了目前仅有的几个发现微粒金刚石的地区如哈萨克斯坦、挪威西部和我国中部等地的超高压变质岩的最新研究成果，并指出这些变质岩中微粒金刚石为变质成因，变质流体对微粒金刚石的形成具有十分重要的意义。由于微粒金刚石的稳定区压力超过了3．5GPa，温度高于700℃，这表明盖层厚度大于100km，因此微粒金刚石代表了比柯石英更极端的高压条件。超高压变质岩石产于大陆俯冲造山带，且其源岩为先存的相对冷的地壳岩石，其折返是一个多作用多阶段的过程。
The recent study of ultrahigh-pressure metamorphic rocks from Kazakhstan, the west Norway and the eastern-central China is summarized briefly in this papper. It is suggested that the microdiamond of metamorphic rocks resulted from metamorphism and the metamorphic fluid had the importance in microdiamond formation. The stability regime for diamond is associated with pressure exceeding 3.5 GPa at temperature above 700℃,thus indicating a crustal overburden equivalent to depths of more than 100km. Therefore,microdiamond represents more extremely high-pressure condition than coesite. The ultrahigh-pressure metamorphic rocks resulted from the continental orogen of subduction,and its source rocks were portions of pre-exiting and relatively cool crust,its exhumation is a process with many factors and many phases.
出处
《世界地质》
CAS
CSCD
1997年第1期23-29,共7页
World Geology
关键词
超高压变质岩
微粒金刚石
动力学
变质岩
ultrahigh-pressure metamorphic rocks, microdiamond , dynamics
