| 柴达木盆地北缘沉积凝灰质岩层段的地层时代 |
| |
| 引用本文： | 门相勇,李伟,席萍,唐伦和.柴达木盆地北缘沉积凝灰质岩层段的地层时代[J].地质科学,2001,36(2):229-233. |
| |
| 作者姓名： | 门相勇 李伟 席萍 唐伦和 |
| |
| 作者单位： | 1. 石油勘探开发科学研究院 北京 100083;2. 青海石油勘探开发研究院 甘肃 736202 |
| |
| 基金项目： | 中国石油天然气总公司重点项目!“新盆地、新层系、新领域科探井选择与实践”(编号 :Y95-1 0 -1 A)的部分研究成果 |
| |
| 摘 要： | 柴达木盆地北缘深部沉积凝灰质岩层段的地层归属存在2种观点,下侏罗统和石炭系。本文通过岩石薄片、微量元素、孢粉组合以及海相化石碎片等多种资料的综合分析,认为沉积凝灰质岩层段与其上的下侏罗统之间岩性、电性出现突变的主要原因是沉积时火山事件以及晚期方解石脉充填造成的,并不能代表下伏的老地层;沉积凝灰质岩层段的海相化石碎片为搬运再沉积的结果,没有地层指示意义;孢粉组合能反映沉积凝灰质岩层段沉积的地质年代,据此确认沉积凝灰质岩层段为下侏罗统湖西山组二段。
|
| 关 键 词： | 孢粉组合 生物碎片 柴达木盆地 沉积凝灰质岩层 下侏罗统 |
| 收稿时间： | 2000-09-15 |
| 修稿时间： | 2000-09-15; |
STRATIGRAPHIC TIME OF SEDIMENTARY TUFFACEOUS BED IN NORTH QAIDAM BASIN |
| |
| Men Xiangyong,Li Wei.STRATIGRAPHIC TIME OF SEDIMENTARY TUFFACEOUS BED IN NORTH QAIDAM BASIN[J].Chinese Journal of Geology,2001,36(2):229-233. |
| |
| Authors: | Men Xiangyong Li Wei |
| |
| Institution: | 1. Research Institute of Petroleum Exploration and Development, Beijing 100083;2. Qinghai Research Institute of Petroleum Exploration and Development, Gansu 736202 |
| |
| Abstract: | There are two different opinions on stratigraphic time of the buried sedimentary tuffaceous bed in the Lenghu No.5 Structure, the North Qaidam Basin: the lower Jurassic and the Carboniferous evidenced by sporo\|pollen assemblages and marine fossils respectively. Based on multidisciplinary analyses of rock thin sections, trace elements, sporo\|pollen assemblages and marine fossil fragments, it is represented that the suddenly change of the lithology and log curves between the Jurassic and the underlying sedimentary tuffaceous bed may result from the volcanic events and the later filling of calcite veins, not being an indicator for older strata; and the fragments of marine fossils in age of Carboniferous are transported and redeposited,without meaning for stratigraphic time. According to the sporo\|pollen assemblages, the time of the sedimentary tuffaceous bed is Early Jurassic, belonging to second member of the Huxishan Formation. |
| |
| Keywords: | Sporo pollen assemblages Fossil fragment The Qaidam Basin Sedimentary tuffaceous bed Lower Jurassic |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《地质科学》浏览原始摘要信息 |
| 点击此处可从《地质科学》下载免费的PDF全文 |
