缝合线研究的新进展——以湖北大冶铁山地区为例

为深入研究碳酸盐岩中的压溶作用,加深对压溶作用的认识和理解,以常见的缝合线构造为例,结合前人的研究成果和现代科技手段对湖北大冶铁山地区的缝合线构造进行了全面深入的研究,得到以下研究成果:丰富了缝合线类型;结合计算机技术获得了缝合线的三维形态;总结了缝合线形成中的一些主控因素;论述缝合线在应力分析、应变测量等传统领域及在能源资源等新领域的应用;对缝合线研究中存在的问题及分歧进行了评述并指出今后几年的研究重点。认为缝合线构造其实是一种不规则的压溶曲面;缝合线的形成是各种主控因素相互间复杂作用的结果;有关各主控因素的作用地位和特点方面的研究结果又可以为缝合线构造的实际应用提供理论依据。

New Progress of the Stylolite Research--Taking Stylolites in Tieshan Area, Daye City, Hubei Province as an Example

Stylolite,as a common pressure solution structure,develops extensively in carbonate,which is of great significance in stress analysis,finite strain determination and research on oil-gas resources.Based on field observation and indoor analysis about the stylolites in Tieshan,Daye,Hubei Province,this paper raises some fresh understandings about the stylolite as follows:(1) Stylolites are classified into wave-shaped,sawtooth-shaped,city-wall-shaped and thin-column shaped stylolites.(2)Two kinds of composite stylolites are identified in the area and named after parasitic composite stylolites and transitional composite stylolites.(3)Stylolite,in fact,is an irregular pressure solution surface.According to the data collected from field outcrops,we gain the 3D-morphology of a stylolite using computer technology.(4)Stylolite formation process is related to rock composition,stresses,fluid chemicals etc.,which provides theoretical basis to practical application.(5) It is considered that the stylolite will be more useful in the assessment of oil-gas resources.