华中东部榴辉岩中绿辉石的反相畴、出溶及其成因意义  

ANTIPHASE DOMAINS AND EXSOLUTION LAMELLAES OF OMPHACITE IN ECLOGITE IN THE EASTERN PART OF CENTRAL CHINA AND THEIR GENETICAL SIGNIFICANCE

作　　者：曹琳[1] 胡克[1] 王安平[1] 姚杰[1] 

机构地区：[1]长春地质学院,长春130026

出　　处：《矿物学报》1995年第3期254-258,T001,共6页Acta Mineralogica Sinica

摘　　要：反相畴及出溶片晶是华中东部高压变质带中绿辉石的主要超微结构，出港片晶的大小受扩散速率和时间的控制，而反相畴的大小可作为变质温度和年龄的标志。通过对Alps、Cali-fornia等高压变质带中绿辉石的反相畴的统计计算，修正了Carpenter所得出的统计公式：δ8=8×（6×1027）e－Ｑ/RT·t。根据作者的成果，绿辉石反相略大小与变质温度及地质年代按如下规律变化：δ9＝9×（6×1026）e－Ｑ／RT·t。由此得出所研究地区曾发生两次地质热事件，其地质年代分别为700Ma（晚元古）及200Ma（印支期）。以上得出的函数关系适用于高压变质带中不同地区的相对地质年代的推算及绝对地质年代的半定量估算。Antiphase domains and exsolution lamellaes are the main micro-structures of omphacite in thehigh-pressure metamorphlc belt, eastern Central China. The size of exsolution lamellae was con-trolled by the diffusion rate and time, that of antlphase domalns is an indicator of metamorphictemperature and time. Statistics and calculation for the Alps and California high-pressure meta-morphic belts by the authors modified the statistical formula of carpenter: δ8 = 8 × (6 × 1027 )e( Q/RT)·t. The antiphase domains of omphacite vary according to the law: δ9 = 9 × (6 × 1O26 ) e(-Q/RT)· t, sotwo thermal events can be determined in the studied region, dated at 700 Ma (Late Proterozoic)and 200 Ma (Indosinian), respectively. The functional relationship presented above is suitable forcalculating the relative geological time and estimating definitely the geological time of different re-gions in the high-pressure metamorphic belt on the scmi-quantitative basis.

关 键 词：榴辉岩 绿辉石 反相畴 出溶 成因 

分 类 号：P588.3[天文地球—岩石学]