论文部分内容阅读
利用氧化缀饰法研究了云南马关新生代地幔尖晶石二辉橄榄岩包体中橄榄石的位错构造。其位错构造种类多样、形态各异,主要包括(100)和(001)位错壁、亚颗粒构造、位错网格、{100}滑动条带构造等,表明该区上地幔岩具高温高应变和低温高应变特征。包体形成的温度T为1016—1098℃,压力P为18.3×108—20.6×108Pa。马关上地幔温压状态具有大洋地幔地温特征,热流值达85mW·m-2。上地幔的流动应力σ为27.9—59.7MPa,流动速率ε为1.37×10-18—2.17×10-16s-1,等效粘滞度η为9.18×1022—6.92×1024Pa·s。该区上地幔的高流动应力、高热状态和裂谷带型的流动速率、等效粘滞度特征,可能与16MaB.P.以来区域性东西向伸展作用有关。
The dislocation structure of olivine in the lherzolite peridotite mantle xenophile inclusions of the Malay Cenozoic in the Yunnan Autonomous Region was studied by means of oxidative decoration. The dislocations are of various types and morphologies, including (100) and (001) dislocation walls, sub-particle structures, dislocation meshes and {100} slip band structures, indicating that the upper mantle rocks in this area have high temperature High strain and low temperature high strain characteristics. The temperature T formed by the inclusion body was 1016-1098 ° C and the pressure P was 18.3 × 10 8-20.6 × 10 8 Pa. The warm-pressure state of the mantle closed with mantle geothermal characteristics of the ocean, the heat flow value of 85mW · m-2. The upper mantle flow stress σ is 27.9-59.7MPa, the flow rate ε is 1.37 × 10-18-2.17 × 10-16s-1, and the equivalent viscosity η is 9.18 × 1022-6.92 × 1024Pa · s. The high flow stress, high thermal state, and the flow rate and equivalent viscosity of the upper mantle in this area may be related to the regional east-west stretching effect since 16MaB.P.