帮助 关于我们

返回检索结果

六盘山地区下白垩统六盘山群乃家河组核形石形成的环境意义
The formation environment and genesis of the oncolite in Lower Cretaceous Liupanshan Group of Liupan Mountain area

查看参考文献18篇

文摘 六盘山寺口子水库下白垩统六盘山群乃家河组中发育了核形石,通过对其外部核心及纹层特征,以及核形石地球化学组分的研究,认为研究区核形石主要产于水动力较强的动荡水环境中,对捕捉和粘附碳酸钙质点作用相当明显,藻类自身的钙化和原地微生物引发的沉淀作用也可能是核形石的成因.经分析得到核形石的Sr/Ba值为4.87,CaO的含量达到了48.18%,总体上,研究区核形石在盐度高、温度较高、气候炎热、蒸发量大的干旱环境条件下形成.这些环境与研究区在该时期受燕山运动的影响,地壳整体抬升,湖盆发生萎缩的构造背景是相符的.
其他语种文摘 Oncolite is a kind of algae pack tablets composed of two parts, the core and cladding. It was the mucus secretion during the growth of algae in the process of capturing bonded debris materials and calcium carbonate particles and was formed through the core accretion as concentric patterned grains. On October 24, 2008, the authors found oncolites in Lower Cretaceous Naijiahe Formation of Liupanshan Group in a tunnel of Sikouzi Reservoir in the Liupan Mountain. The Lower Cretaceous strata in the study area are mainly composed of a set of purple, grayish green and gray mudstone, gray marl and light yellow muddy siltstone, with thin layered plas-ter between the marl. Oncolites occur in the upper part of Naijiahe Formation. A study of their external core and lamination characteristics suggests that they were formed mainly in a turbulent and high-energy water-environment. Geochemical compositions of the oncolites show that the debris was derived from land-based oxides such as SiO_2, Al_2O_3, Fe_2O_3, and FeO, whose values are all relatively low, with SiO_2 being 8.20%, Al_2O_3 being 2.77%, and (Fe_2O_3+FeO) being 3.00%. The content of these oxides in the lake depends on the amount of terrestrial detritus that entered the lake. In addition, the inflow of terrigenous detritus and vegetation cover are also related to the extent of weathering. The lower the degree of weathering or the better the covering, the lower the debris substance content. Therefore, the oncolites with relatively low SiO_2, Al_2O_3, Fe_2O_3, and FeO values indicate that during the same period the climate was relatively dry and the weathering was not strong. As only a small amount of clastic materials flowed into the lake and the lake water was relatively clean, a suitable water environment for the growth of algae and concolites were formed, and this also implies the close relationship between the influx of terrigenous clastic rocks and the growth of concolites. CaO content of concolites reaches 48.18%, indicating an obvious effects of the capturing and adhesion of calcium carbonate particles. Calcified algae itself and in situ precipitation of micro-organisms might also have been the causes for the formation of these concolites. The Sr/Ba value is 4.87, and the CaO content reaches 48.18%, suggesting that in the study area concolites were formed in a high salinity, high temperature, hot and strong evaporation arid environment. In Early Cretaceous, the region was affected by the Yanshanian movement, resulting in crustal uplift and lake atrophy. A study of the formation environment of these oncolites in Liupanshan area shows that their formation environment was consistent with the tectonic setting at that time.
来源 岩石矿物学杂志 ,2010,29(2):206-212 【核心库】
关键词 核形石 ; 六盘山地区 ; 下白垩统 ; 乃家河组
地址

1. 中国人民解放军空军95338部队1大队, 湖南, 衡阳, 421200  

2. 中国石油化工有限公司石油勘探开发研究院, 北京, 100083  

3. 化工部郑州地质工程勘察院, 河南, 郑州, 450011  

4. 中国石油大学(华东)地球资源与信息学院, 山东, 东营, 257061

语种 中文
文献类型 研究性论文
ISSN 1000-6524
学科 地质学
基金 中国西北地区构造-岩相古地理研究与编图资助项目 ;  碳酸盐岩缝洞型油藏高效开发研究资助项目
文献收藏号 CSCD:3842480

参考文献 共 18 共1页

1.  Arenas C. Sedimentology of tufa facies and continental microbialites from the Palaeogene of Mallorca Island (Spain). Sedimentary Geology,2007,197:1-27 被引 12 次    
2.  Dahandyake K. Classification of oncoids from the upper Jurassic carbonates of the French Jura. Sedimentary Geology,1977,18(4):337-354 被引 1 次    
3.  Li Xizhe. The oncoids genesis in the Middle Member of the Guanzhuang formation of Eocene in Pingyi basin (in Chinese with English abstract). ACTA PETROLOGICA SINICA,1999,16(2):261-268 被引 1 次    
4.  陈启林. 蒙甘青地区早白垩世原型盆地特征及其对烃源岩分布的控制. 地球科学进展,2005,20(6):656-663 被引 8 次    
5.  贺自爱. 藻灰结核分类及其成因. 石油与天然气地质,1982,3(1):41-48 被引 14 次    
6.  黄志诚. 安徽奥陶系石灰岩中含铁非骨架核形石的成因及其聚铁作用. 沉积学报,1987,5(2):29-38 被引 12 次    
7.  金学强. 宁夏六盘山地区白垩纪地层环境演化研究. 宁夏工程技术,2006,5(1):1-3 被引 5 次    
8.  李熙哲. 平邑盆地下第三系官中段核形石成因分析. 岩石学报,2000,16(2):261-268 被引 22 次    
9.  刘万洙. 松辽盆地白垩系青山口组核形石的发现及其环境意义. 地质学报,2008,82(5):594-600 被引 8 次    
10.  刘效曾. 川西北中三叠统隐藻类碳酸盐岩特征及其环境意义. 沉积学报,1983,1(3):79-87 被引 14 次    
11.  闵隆瑞. 河北阳原东目连第四纪叠层石古环境分析. 地质学报,2002,76(4):446-453 被引 20 次    
12.  屈红军. 六盘山盆地下白垩统沉积层序与含油气系统. 西北大学学报（自然科学版）,2003,33(1):70-74 被引 15 次    
13.  温志峰. 柴达木盆地古近纪—新近纪湖相叠层石与藻礁的沉积组合特征与意义. 地质学报,2005,79(4):444-453 被引 20 次    
14.  夏正楷. 泥河湾盆地虎头梁湖相叠层石的生态环境分析. 第四纪研究,1998,4:344-350 被引 6 次    
15.  夏正楷. 泥河湾中叠层石的发现及其古环境意义. 中国科学(B),1993,23(8):874-879 被引 22 次    
16.  杨玉芳. 松辽盆地早白垩世青山口组核形石的特征及其环境意义. 地质学报,2009,83(4):558-569 被引 16 次    
17.  曾允孚. 广西泗顶泥盆系上统融县组中核形石的类型及其环境意义. 沉积学报,1983,1(1):42-49 被引 17 次    
18.  张新建. 富县探区延长组微量元素特征及地质意义. 新疆石油地质,2004,25(5):483-485 被引 8 次    
引证文献 2 篇

1 赵晓辰 中国南北构造带北部中生代地质事件及其演化序列 地质论评,2018,64(6):1324-1338
被引 3 次

2 姜红霞 塔里木盆地塔中台地上奥陶统良里塔格组核形石成因研究 地质科学,2023,58(2):677-696
被引 0 次

显示所有2篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

版权所有 ©2008 中国科学院文献情报中心 制作维护：中国科学院文献情报中心
地址：北京中关村北四环西路33号 邮政编码：100190 联系电话：(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号