新潟油田地域新第三系堆積岩中の海緑石について

抄録

In this paper, the writer describes the mineralogical study of glauconite from the various sedimentary rocks of Neogene Tertiary system in Niigata oil field area by the methods of optical observation and X-ray diflraction analysis, and lastly he concludes as follows:
1) These glauconite samples are classified into mica like type (a₁, a₂), montmorillonite-illite mixed layer like type (b₁, b₂), montmorillonite like type (C) and mineral mixtured type (D).
2) It is considered they must be derived from such a source materials as volcanic detritus.
3) Glauconitization will be promoted strongly in an anaerobic sedimentary environment having a larger quantity of organic materials and a slower sedimentary velocity with lesser sediments, because the sufficient contact action by sea water is necessary for glauconite formation.
4) As a similar glauconite are formed in a resembling environment, so the correlation by using glauconite is available only such a formations which has deposited in the same basin having a fixed environment.