晋州地域 新洞層群 및 河陽層群下部 砂岩의 粒間物質과 積成作用 = Interstitial Materials and Diagenesis of the Sandstones of the Sindong Group and Lower Hayang Group in Jinju Area, Korea

다국어 초록 (Multilingual Abstract)

39 sandstone samples of the Sindong Group and Lower Hayang Group in Jinju area were studied, putting emphasis on interstital materials, diagenesis phase, mineral constituents, and textural parameter. The results obtained may be generalized as the following. 1) Calcite, contained on average 14% of the mineral constituents and mainly occurred single crystals which completely bounding the grains, is the carbonate cements most common with the simple cements that occupy some parts of the pore space of the sandstone taken from the study area. 2) Locomorphic diagenesis changes, such as cementation (carbonate and silicate), mineral replacement (cacite-clay replacement, feldspar-calcite replacement, calcite-quartz replacement. etc.), and authigenic silicate overgrowth are found in most of the sandstones taken from the study area. The net effect of these diagenesis stage and mineral(calcite and silica) cementation is to diminish or destory the primary intergranular porosity. 3) According to these evidences that a considerable amount of calcite was pricipitated in pore space as cements and diagenetic changes such as calcite replacement of clay matrix, quartz grain replaced by calcite, and partial replacement of detrital feldspar grain by calcite was made in the sandstones, it can be inferred that the PH of water when the Sindong Group sandstones were deposited was alkaline condition greater than 7.8. 4) Sandstone type of Jinju area mainly belongs to feldspathic arenite and arkose clan (according to sandstone classification of Folk, Dapple, and Okada), and textural maturity belongs to submature clan.