摘要
为明确晚白垩世赛汉期盆地沉积期构造分区、充填过程和沉积相空间分布,本文运用岩矿鉴定、重矿物分析、岩石地球化学特征分析等方法,讨论了川井坳陷赛汉组沉积物源,认为赛汉组碎屑岩具有低成熟度和近源堆积特征,重矿物成分主要以磁铁矿、石榴石为主,与蚀源区花岗岩相似;赛汉组稀土元素配分曲线表现为明显Eu负异常和右倾,微量元素曲线表现为高场强元素P、Ti的亏损,与中生代至晚古生代花岗岩曲线形态相似;表明赛汉组砂岩碎屑主要来源于蚀源区的中生代至晚古生代花岗岩,结合川井凹陷蚀源区基底岩性分布规律,认为中央隆起带两侧、盆地南部铀源明显优于北部蚀源区,整体铀成矿潜力更大。
In order to clarify the structural division,filling process and the spatial distribution of sedimentary facies during the sedimentary period of the Saihanian Basin in the Upper Cretaceous,this paper discusses the sediments of the Saihan Formation in the Chuanjing Depression using methods such as rock and mineral identification,heavy mineral analysis,and rock-geochemical characteristics analysis.It is believed that the clastic rocks of the Saihan Formation have the characteristics of low maturity and close accumulation.The heavy minerals are mainly composed of magnetite and garnet,which are similar to the granites in the erosion source area;the rare earth element distribution curve of the Saihan Formation is obvious Eu negative anomaly and right leaning,the trace element curve shows the loss of high field strength elements P and Ti,which is similar to the Mesozoic-Late Paleozoic granite curve;it indicates that the sandstone clastics of the Saihan Formation mainly originate from the Permian to the third period in the erosion source area.The granite bodies of the Paleozoic period,combined with the lithology distribution of the basement of the erosion source area in the Chuanjing Sag,suggest that the uranium sources on both sides of the central uplift belt and in the southern part of the basin are significantly better than those in the northern erosion source area,and the overall uranium metallogenic potential is greater.
作者
李西得
孙祥
邱林飞
田明明
LI Xide;SUN Xiang;QIU Linfei;TIAN Mingming(Beijing Research Institute of Uranium Geology, Division of Geology and Mineral Resources, Beijing 100029, China)
出处
《南华大学学报（自然科学版）》
2022年第1期66-71,共6页
Journal of University of South China：Science and Technology
基金
中国核工业地质局项目(201901-15)。
关键词
重矿物
岩石地球化学
物源分析
砂岩型铀矿
赛汉组
川井坳陷
heavy minerals
rock geochemistry
sediment source analysis sandstone-type uranium deposit
Saihan Formation
Chuanjing Depression
