| 珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义 |
| |
| 引用本文： | 石创.珠江口盆地阳江东凹文昌组泥岩稀土元素特征及其地质意义[J].地质科技通报,2022,41(3):166-172. |
| |
| 作者姓名： | 石创 |
| |
| 基金项目： | "十三五"国家科技重大专项课题项目2016ZX05024-004-002中海油"十三五"科技重点项目CNOOC-KJ135ZDXM37SZ |
| |
| 摘 要： | 沉积岩中的稀土元素具有良好的化学稳定性, 能够较好保存原始沉积记录。为了揭示阳江东凹文昌组发育时期的物源区物质来源、构造背景和沉积环境, 选取凹陷内Y-1井文昌组泥岩样品进行元素测试, 系统分析研究区文昌组泥岩稀土元素地球化学特征。结果表明, 文昌组泥岩稀土元素含量高, 轻稀土元素相对富集, Eu为明显负异常, Ce为微弱正异常特征。文昌组物质来源以花岗岩为主, 含有少量沉积岩, 沉积源区为被动大陆边缘构造背景。Ceanom和δCe参数指示文昌期水体处于还原环境, 为优质烃源岩发育提供良好的保存条件, 纵向上水体还原性演化规律为: 强→弱→强→弱, 与文昌组泥岩TOC变化趋势一致。
|
| 关 键 词： | 构造背景 沉积环境 稀土元素 文昌组 阳江东凹 珠江口盆地 |
| 收稿时间： | 2021-06-16 |
REE characteristics and geological significance of mudstones from Wenchang Formation in eastern Yangjiang Sag of Pearl River Mouth Basin |
| |
| Abstract: | The REE in sedimentary rocks have strange chemical stability and can well record the original sedimentary message.In order to explore the material source, tectonic setting and sedimentary environment of the Wenchang Formation in Eastern Yangjiang Sag, the REE geochemical characteristics of Wenchang Formation mudstones from well Y-1 in the study area were systematically analyzed.The results show that the concentrations of REE in mudstones of Wenchang Formation is high, yielding relatively enrichedof LREE, obviouslyEu negative anomaly and weak Cepositive anomaly.The material of Wenchang Formation is mainly source fromgranite with a small amount of sedimentary rocks, and thus the sedimentary source area is likely to be the passive continental margin tectonic setting.TheCeanom and δCe indicate that the water was under reducing conditions, which could provide well preservation conditions for the development of high-quality source rocks. Furthermore, the temporal variations of redox conditions are consistent with the variation trend of TOC of mudstone in Wenchang Formation. |
| |
| Keywords: | |
|
| 点击此处可从《地质科技通报》浏览原始摘要信息 |
| 点击此处可从《地质科技通报》下载免费的PDF全文 |
|
