泥灰岩の石灰分定量 : 精密地質調査の1方法

概要

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1., The author tried to determine lime contents in Miocene marl during his investigation of oil fields in Dutch New Guinea., Unfortunately, he could not complete his studies, so that only the possibility of this new method in detailed correlation and practice are described in present paper., 2., Marl samples from two hand borings located 700 meters apart were used., Apparently there are no lithological and paleontological differences., 3., Seven grams of samples taken from every two meters of core were dried in a dessicator (up to 25% of water was evaporated)., Five grams of dried sample, after treatment by hydrochloric acid, were dried and weighed., Then the lime content (actually, lime plus small quantity of other components) is calculated., All these treatments were carried on in the field, using very simple equipment capable of operation by inexperienced assistants., 4., Main Results: a., Cores from the surface to a depth of 15-20 meters are not suitable for this method (thickness of soil and subsoil was about 5 meters)., b., Marls are correlated by curves of lime content slowing in lithological characteristics., Such a examination is not possible by megascopic paleontological studies., c., This method has promise of application to marly formations, in searching for a horizon corresponding to a limestone layer which thins out.,
日本地質学会の論文
1950-04-05