摘要
以南天山东段铜花山—榆树沟地区为例,通过小波包图像处理分析,结合野外实地验证,认为小波包处理后的遥感图像上,韧性剪切带具有独特的影像特征。剪切带两侧的纹理在形状、粗细、延伸方向和弯曲类型上均表现为明显的不一致。剪切带本身表现为负影像特征及细腻、均匀和密集的定向纹理。大小不同的透镜体被密集纹理组成的强应变带环绕。剪切带穿越早期褶皱时,出现新月形、花朵形、鳄鱼嘴形和辫子形等多种复杂的叠加褶皱形态。根据剪切带两侧的影纹结构可以判断剪切带的运动方向。
Taking the Tonghuashan-Yushugou area in south Tianshan mountains as an example, it was found that there existed abnormal characteristics of ductile shear zone in remote sensing image based on the image processes of wavelet transform combining with field survey. The shape, thickness, stretch direction and bend type of the texture on both sides of the shear beltings, which easily communicated with the acid water in virtue of remnant pores or microcracks, and differentiation diversity of various elements, such as silicon, aluminium, potassium, sodium and calcium, depended on their activities. By contrast, the tuff fillings in the occluded burial environment could be saved to some extent, which was not qualified with crystal features in microscope, and had much contents of some elements with high activities. The dissolution of tuff fillings could produce much intergranular secondary pores, and the gas reservoir was enhanced intensively. Cast slice of the sandstones with higher interval transit time verified that the dissolution intensity of tuff fillings took on trunk. The tuff fillings of sandstones were dissolved strong, and much secondary pore and impure kaolinite presented in the trunk. By contrast, the tuff fillings of sandstones could be saved well, and impure kaolinite rarely presented on the top of the trunk.
出处
《地质科学》
CAS
CSCD
北大核心
2005年第3期421-428,438,i0003-i0004,共11页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金(批准号:49972075)
国家重点基础研究发展规划项目"中国西部中亚型造山与成矿古生代洋陆格局演变与大陆侧向增生"(编号:2001CD409801)资助
关键词
小波包
韧性剪切带
解译标志
Tuff fillings, Differentiation, Porosity, The northwestern Ordos Basin, The Permian sandstones
作者简介
陆关祥，男，1963年2月生，博士后，遥感地质学专业。
