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海南岛全新世沙丘岩与海滩岩的沉积特征及其成岩环境
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Abstract:
以海南岛沿海的全新世海滩岩和沙丘岩为研究对象，通过野外露头、显微镜观察和扫描电镜等分析方法研究了海滩岩和沙丘岩的岩石学特征和成岩机制。海滩岩胶结物主要由文石针和泥微晶高镁方解石组成，识别出三类胶结组构和五种成岩作用。沙丘岩胶结物主要由粒状低镁方解石组成，识别出三类胶结组构和四种成岩作用。海南岛全新世碳酸盐岩的野外产状、胶结物成分和胶结组构所反映的成岩作用以及成岩环境特征，提供了一个全新世以来，以热带滨海地表为主要成岩环境，以钙质胶结物及陆源碎屑为主要成分的早期成岩作用模式，该启示将对我们解译古碳酸盐胶结岩的成岩作用提供借鉴。
The Holocene beachrock in Hainan island as the research object, through Field phenomenon, mi-croscope and SEM to study the cementation characteristics and diagenesis of beachrock and eolia-nite. The beachrock cement is mainly composed of Mud microcrystalline high magnesium calcite and aragonite needles. There are three kinds of cement fabric and five kinds of diagenesis. The eo-lianite cement is mainly composed of low magnesium calcite. There are three kinds of cement fabric and four kinds of diagenesis. The characteristics of diagenesis and diagenetic environment reflected by field occurrence, cement composition and cementation fabric of Holocene carbonate rocks in Hainan Island, provide an early diagenesis model of sediments with terrestrial debris as the main component in the nearshore diagenetic environment of tropical beaches since the Holocene, it will provide inspiration for us to understand and explain ancient carbonate rocks.
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