• 责任者：Zhang Kan (Laboratory of Isotope Geology ; MLR ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhu Xiangkun
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2013
• 卷期：32(4)
• 关键词：菱铁矿 ; siderite ; 黑色页岩 ; black shale ; 天津 ; Tianjin
• 页码：p.529-537
• 图表：5 illus., 1 table, 13 refs.
• 分类号：0803
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

     This paper reports the basic geological characteristics of these siderite-rich strata in terms of the field outcrop, petrology and major elements. Studies show that the profile is characterized by black shale interbedded with silty iron-rich layers/siderite concrete layers, and also has minor siltstone. Some iron-rich strata have turned into limonite layers in the outcrop because of intense weathering. In addition, FeO content has a positive correlation with TOC content in fresh samples, which implies that the genesis of siderites may have some relationship with organic matter.