海南戈枕剪切带构造岩石英组构和超微构造研究  

STUDIES OF THE QUARTZ FABRIC AND THE ULTRASTRUCTURE IN TECTONITES OF GEZHEN SHEAR BELT FROM HAINAN ISLAND

作　　者：涂绍雄[1] 战明国[1] 

机构地区：[1]宜昌地质矿产研究所

出　　处：《矿物岩石》1994年第1期42-52,共11页Mineralogy and Petrology

摘　　要：海南戈枕剪切带南部二甲－不磨地区糜棱岩类构造岩石英组构和超微构造呈现有规律的变化，表现在从剪切带边部至中心，从南西段到北东段，石英组构的剪切角由大变小，由单极密环带组构向多极密环带组构变化。用位错密度法和重结晶石英粒度法估算的差异应力和应变速率值，以剪切带北东段中心（２４５．６ＭＰａ，３．３４×１０￣（－１３）／ｓ）最大，向边部（１６２．９ＭＰａ，５．８３×１０￣（－１６）／ｓ）和南西段（１４９．１ＭＰａ，４．６３×１０￣（－１６）／ｓ）变小，表明剪切带北东段中心处于韧性域，边部和南西段处于韧脆性域。用这些资料较好地解释了该区金矿床的空间分布，含金地质体及工业矿体（富矿包）的产状等。The quartz fabric and the ultrastructure in tectonites of Gezhen shear belt from Erjia-Bumo area,Hainan island ,display regular variation,From border or southwest to Centre or north-east,the quartz fabric diagram varied from monococentration bearing monoclianal girdle to multi-concentration girdle;shear angle decreses gradually;the ultrastructures indicate evolution from microthermal high strain to macrothermal high strain. The calculations for differential stress and strain rate state clearly that the two values had contents of 245.6 MPa and 3.34×10￣(-13)/s in northeastern centre of shear belt,whereas towards border or southwest of the shear belt they go down to contents of 162.9MPa and 5.83 × 10￣(-16)/s,149.1MPa and 4.63 ×10￣(-16)/s,respective-ly. These results bear out that the northeastern centre of shear belt is located in ductle domain,whereas northeastern border and southwestern part of shear belt are situated in ductile-brittle do-mains.The special distribution of different gold types, the spread arrangement of gold-bearing geological bodics and the occurrence of economic orebodies or shoots are well interpreted by using these data.

关 键 词：构造岩 石英组构 超微结构 剪切带 

分 类 号：P583[天文地球—岩石学]