骨节状香肠构造形成机制研究——以湖北铁山为例

以湖北大冶铁山地区骨节状香肠构造为对象,根据其骨节缝形态、香肠层的剖面形态以及骨节缝填充脉体与香肠形成的期次关系,划分出13种骨节状香肠构造类型;通过对其物质组成的镜下鉴定,认为其形成过程中至少发生两期变形作用,并总结出三种力学机制①两期递进的垂直层面压缩变形叠加;②早期垂直层面压缩与后期平行层面剪切的叠加;③早期垂直层面压缩与后期平行层面挤压的叠加。

The Formation Mechanism of Bone-Shaped Boudinage: A Case Study of Tieshan, Hubei

Detailed studies of bone_shaped boudinage structure found in Tieshan of Daye, Hubei Province, were conducted with the purpose of finding out its for mation mechanism. Thirteen types of bone_shaped boudinage are distinguished in the light of the configuration of joining fission and boudin_layers and the sequence of filling veins in joining fission and the formation of boudins. Identifications of substances forming bone_shaped boudinage under polarizing microscope show that the competent layer has undergone at least two periods of deformation. Three types of formation mechanism are recognized: 1) the overlapping of two periods of compression perpendicular to the layer; 2) the overlapping of early compression perpendicular to the layer with late shear parallel to layer; 3) the overlapping of compression perpendicular to the layer with compression parallel to the layer.