苏皖地区船山组核形石的显微特征和分类研究  

Microscopic characteristics and classification of oncolites from the Chuanshan Formation in the Su-Wan area

作　　者：宋德朋 SONG Depeng(Nanjing Engineering Vocational College,Nanjing,Jiangsu 211135,China)

机构地区：[1]江苏省南京工程高等职业学校,江苏南京211135

出　　处：《安徽地质》2024年第3期193-196,207,共5页Geology of Anhui

基　　金：中国职业技术教育学会2023年度科研课题“宝石晶体形态分析和结构模拟的三维可视化教学研究”(编号:ZJ2023B089)资助。

摘　　要：核形石是碳酸盐岩颗粒的一种重要类型,是沉积学研究的热点。长期以来,国内外学者对核形石曾有藻鲕、藻灰结核、藻包粒等多种不同术语来描述,并作出不同的分类。本文在前人研究的基础上,通过野外调查,并利用偏光显微镜对苏皖地区船山组核形石进行薄片研究,根据核形石的纹层排列方式将核形石的几何形态划分为四种类型,认为不同纹层结构类型反映了核形石在实际生长过程中环境和水动力条件的变化。As an important type of carbonate particles,oncolite is the focus of sedimentological research.For a long time,scholars at home and abroad have used different terms to describe and classify oncolite,such as algal ooid,onkoid,etc.On the basis of previous studies and a follow-up field investigation,this paper conducted a rock thin-section study of oncolites from the Chuanshan Formation in the Su-Wan area using polarizing microscope.According to the arrangement of the laminae of the oncolite,the geometric morphology of the oncolite is divided into four types.It is believed that the different laminated textures reflect the changes of the environmental and hydrodynamic conditions during the period of oncolite growth.

关 键 词：核形石 显微特征 核形石形态分类 

分 类 号：P581[天文地球—岩石学]