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对赣西北中元古界双桥山群岩石进行系统的有限应变测量 ,结果表明 ,双桥山群岩石的主要应变类型为平面应变 ,其对数Flinn参数K值在 0 .78～ 1.44之间 ;岩石应变强度Υ值在 2 .5 9～ 4.60之间 ,平均为 3 .15 ,表明岩石应变强度较大。岩石有限应变强度具有南强北弱、东强西弱的规律。有限应变的椭球X轴优势方位为近东西向 ,反映双桥山群岩石在变形作用过程中 ,近南北向压应力作用占主导地位。
The systematic finite strain measurements of the rocks of the Shuangqiao Group in the Mesoproterozoic in Northwestern Jiangxi Province show that the main strain type of the Shuangqiao Group is plane strain and the K value of the logarithm Flinn parameter is between 0.78 and 1.44 ; The value of γ of rock strain is between 2.59 and 4.60, with an average of 3.15, indicating that the rock strain strength is larger. The finite strain strength of rock has the weakening of south strong north and weakening of east strong and weak west. The predominant azimuthal orientation of the finite strain ellipsoid X-axis is nearly east-west, which indicates that during the deformation process of the Shuangqiaoshan group rocks, compressional stress near the north-south direction dominates.