RELATIONSHIP BETWEEN PETROLOGIC AND GEOMOPHOLOGIC CHARACTERISTICS OF MICROGRAPHIC GRANITE IN SOUTHEASTERN PART OF KOREA
The previous studies suggest that these micro-landforms were formed by various weathering process and climate and erosion factors for the formation of topography have been studying. However works for the relationship between specific topography and petrogenesis of host rock have not totally investigated.
Thus, this study aims to determine the effect of petrogenesis of micrographic granite on the specipic formation of topography.
A Field geological survey, the geochemical and mineralogical study in this area were carried out petrographic microscope, XRF and ICP-MS.
The light brown- light gray colored granite is composed of fine-grained quartz and orthoclase, and these form intergrowth and have micrographic texture. Miarolitic cavities are predominant.
Many micro-landforms including tor, tafoni and gnamma are observed at micrographic granite in study area. Tafoni is dominant in northern area and gnamma is dominant in southern area. From the careful study on the occurrence and textural properties, two alteration zones were clearly identified. One is external zone (A), and the another is internal zone (B). The former is dominant in northern area, and the latter is dominant in southern area.
Particular geomorphologic features such as fluting core, raised rim, pebble beach and so on are occurred in the study area. This suggests that development of miarolitic cavity plays an important role in formation of various geomorphologic features. Consequently, petrogenesis of micrographic granite is related to geomorphologic features in the external zone of the tiger rock with lot of tafoni and the formation of a platform as micro-landforms is influenced by textural difference of host rock in the internal zone.