Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

Depositional Environments and Diagenetic History of the Panyawol, Hwasan, and Shinyangdong Formations, Kyongsang Supergroup, Korea -With Emphasis on Carbonate Rocks-

경상누층군 반야월층, 화산층 및 신양동층의 퇴적환경과 속성작용 -탄산염암을 중심으로-

Lee, Kwang-Choon;Woo, Kyung-Sik;Paik, Kwang-Ho;Choi, Seung-Jin
이광춘;우경식;백광호;최승진

  • Published : 19911000

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Abstract

The sedimentary rocks of the Hayang Group are mostly composed of clastic rocks interbedded with calcareous mudrocks, and include stromatolitic and argillaceous limestones. The limestones and mudstones contain stromatolites along with pellets, ooids, ostracods, etc.. We have investigated the stromatolitic limestones of the Panyawol, Hwasan, and Shinyangdong Formations of the Hayang Group, Kyongsang Supergroup, near Hayang, Shinnyong, and Chunsan areas, Kyongsangbukdo, to delineate the depositional environments and diagenetic history. The sedimentary sequence can be divided into seven lithofacies: 1) oolitic grainstone, 2) sandstone 3) black argillaceous limestone, 4) greenish siltstone/sandstone, 5) stromatolitic baffle-stone, 6) black shale. and 7) intraclastic packstone. Each lithofacies represents lacustrine or shore facies. Shore facies includes oolitic, pelletal, or sandy shore (sandflat) with ripple marks, cross-laminations, burrows, and synaeresis cracks. Sandflat also includes backshore sandy/muddy flat with mudcracks and shoreface with stromatolites. The dominance of carbonate vs clastic shore was dependent upon the rate of carbonate production in the lake. The paragenetic sequence of the limestone in the study areas indicates that the rocks have undergone shallow lacustrine diagenesis, meteoric-phreatic diagenesis, and burial diagenesis. Shallow lacustrine diagenesis was characterized by micritization and cementation of radiaxial fibrous calcite (RFC), botryoidal aragonite, and spherulitic fibrous calcite. Meteoric-phreatic diagenesis involved equant calcite cementation filling the interparticle and vuggy pores as well as fractures, and burial diagenesis included cementation or replacement by equant calcite spar, (ferroan) dolomite, and quartz. Textural observation and elemental compositions of diagenetic products suggest that diagenetic history of all the three study areas has been different depending upon localities.

경상북도 하양, 신령, 춘산 부근에는 주로 쇄설성암으로 구성된 경상누층군의 반야월층, 화산층 및 신양동층이 각각 분포한다. 이 층들 내에는 주로 스토모마톨라이트가 발달한 탄산염암이 협재하며 펠릿, 우이드, 개형충도 산출되어, 이들을 대상으로 퇴적환경과 속성작용에 대한 연구가 수행되었다. 본 퇴적층들은 7개의 암상으로 구분되는데 그들은 1) oolitic grainstone, 2) sandstone, 3) argillaceous limestone, 4) greenish siltstone/sandstone, 5) stromatolitic bafflestone, 6) black shale, 7) intraclastic packstone이다. 이 암상들은 호성상(lacustrine facies)과 호안상(shore facies)을 지시한다. 호안상은 연흔, 사층리, 벌레구멍, 수축렬(synaeresis crack)이 발달된 oolitic shore, pelletal shore 또는 sandy shore(sand flat) 상이며 sand flat 상은 건렬이 발달된 blckshore sandy/muddy flat 상과 스트로마톨라이트가 발달된 shoreface 상이다. 본 지역내의 석회암들은 천호속성작용, 천수속성작용 및 매몰속성작용을 거쳐왔다. 천호속성작용은 미크라이트화 작용과 방사상 섬유상 방해석(RFC), 포도상 아라고나이트 및 구과상 섬유상 방해석의 교결작용이 특징이다. 한편, 천수속성작용은 공극을 충진하는 등입질 방해석의 교결작용이, 매몰속성작용은 등입질 방해석과 백운석 및 석영에 의한 교결작용이나 교대작용이 특징으로 나타난다. 그리고, 본 연구지역에서 발견되는 속성작용의 산물들이 갖는 조직과 원소성분에 의하면 각 지역이 상이한 속성작용을 받은 것으로 나타나고 있다.

Keywords

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