论文部分内容阅读
大量大型石笋纵剖面研究表明,石笋矿物组成有方解石、文石、文石(方解石)-方解石(文石)三种类型,三类的结构、纹(微)层和放射状构造、结构构造转变等特征类同,并存在于碳酸盐沉积石笋生长的全过程,但文石笋的细微粒针(柱)状(微粒)结构、放射状、纹(微)层构造更显著。石笋结构构造转变的主要表现是:文石转变成方解石;文石、方解石次生增大,呈现不断晶化的成晶过程。文石转变为方解石,常保留文石的针状、针柱状结构和柱状聚晶体,呈文石假象,文石次生加大仍保存其结构构造和聚晶;方解石次生增大,常保存其粒状、菱面体、偏三角面体、聚片双晶和柱状、板状聚晶。石笋结构构造转变及其晶化强度,受控于洞穴温度、湿度、滴水和凝结水对石笋的渗透、淋漓,主要受石笋含水度大的制约。组成石笋的碳酸盐沉积、组合、结晶、晶化次生增大等,结构构造的形成及其弱、中、强转变,都在常(低)温常(低)压的洞穴气候环境中进行,是自调整作用的沉积、成晶、成岩晶化过程,没有外来物质加入,因而不影响同位素分馏和古气候环境记录。石笋结构构造转变研究,对古气候环境重建与生态修复、成晶成矿理论和实践、同位素测年校正和运用都有重要意义。
Studies have shown that a number of large longitudinal section stalagmites, stalagmites mineral composition calcite, aragonite, aragonite (calcite) - calcite (aragonite) three types, three types of structure, texture (micro) layer and a radial configuration, like the structure of the transition structure The features are the same, and exist in the whole process of carbonate deposition stalagmite growth. However, the structure of fine grain pin (pillar) (microparticle) and the radial structure of the stalagmite are more significant. Stalactites structural changes in the main manifestations are: aragonite into calcite; aragonite, calcite secondary growth, showing crystallization crystallization process. Aragonite into calcite, aragonitic acicular, acicular and columnar polycrystals are often retained, presenting the artifact of aragonite. The secondary growth of aragonite still retains its structural structure and polycrystal. The calcite secondary increases and often retains its granular, Rhombohedron, trigonoid, polycrystalline twin and column, plate polycrystalline. The structural transformation of the stalagmite and its crystallization intensity are controlled by the temperature and humidity of the cave, the infiltration and dripping of drip and condensate on the stalagmite, which are mainly controlled by the water content of the stalagmite. Carbonate deposition, assemblage, crystallization and secondary crystallization of the stalagmite are the most common types of stalagmites. The formation of structural structures and their weak, moderate and strong transformation are all under the conditions of normal (low) normal (low) pressure cave climate Is self-adjusting sedimentation, crystallization, diagenesis crystallization process, there is no foreign material to join, so does not affect the isotopic fractionation and paleoclimate records. The research on the structural tectonic transformation of stalagmites is of great significance to the reconstruction and ecological restoration of paleoclimate and environment, the theory and practice of metallogenic mineralization, the dating and application of isotope dating.