摘要
歧口凹陷沙河街组一段广泛发育"纹层状钙质泥岩"、"油页岩",然而,通过光学显微镜、扫描电镜观察以及全岩X射线衍射分析,显示这些"纹层状钙质泥岩"、"油页岩"相当部分是由泥岩和颗石灰岩呈纹层状互层构成的。颗石灰岩的地球化学分析、矿物学研究结果表明其与海水有关,进一步比较现代黑海颗石藻发育环境及纹层状的颗石藻沉积物特征,发现歧口凹陷乃至渤海湾盆地沙一段广泛发育的颗石灰岩与黑海颗石藻沉积物产状极为类似。这说明歧口凹陷颗石灰岩是在渤海湾盆地与外海沟通期间,由外海进入渤海湾湖盆的颗石藻勃发、沉积的结果。
In Shahejie ⅠMember in Qikou Depression, the massive 'alcareous laminated mudstone'or 'Bituminous rock'are discovered. However, by means of the optical microscope, the scanning electron microscope observation as well as the entire cock X-ray diffraction analysis, it is identified most part of these 'alcareous laminated mudstone', 'Bituminous rock'are composed by mudstone and coccolith limestone. The limestone geochemistry analysis, the mineralogy findings indicated that the forming of coccolith limestone were related with sea water, further compared with coccolith growth environment and the characteristic of its deposit in modern Black Sea, it is discovered the coccolith limestone of Shahejie ⅠMember in Qikou depression and even Bohai basin is similar to the coccolith limestone in the Black Sea. This indicate that at the communication period between Bohai Bay and sea, coccolith limestone in Qikou Depression is the result of blooms and deposition of coccolith when it entered the Bohai Basin from the open sea.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第5期45-47,56,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
四川省重点学科建设项目资助(SZD0414)
西南石油大学课外开放实验项目研究内容
关键词
颗石灰岩
沙河街组一段
湖-海沟通
歧口凹陷
古近纪
coccolith limestone
Shahejie ⅠMember
connection the sea and lake
Qikou Depression
Paleogene
