| 摘要: |
| 本文对中侏罗统沙溪庙组泥质岩的主量元素、微量元素和稀土元素特征进行了研究,并讨论了物源区性质以及风化特征。物源区以长英质岩石为主,指示化学风化程度的CIA指数及成分成熟度的ICV指数,表明经历了低-中等的化学风化作用,反映了中侏罗世的半干旱气候环境。 |
| 关键词: 自贡 中侏罗统 地球化学 四川盆地 |
| DOI： |
| 附件 |
| 投稿时间：2007-06-11 |
| 基金项目:中国地质调查局"四川盆地中生代恐龙动物群研究"项目(200313000051)。 |
|
| Geochemistry and implications for the source areas and weathering in the Shaximiao Formation, Zigong, Sichuan |
| WANG Quan-wei, LIANG Bin, KAN Ze-zhong |
(1. Sichuan Institute of Geological Survey, Chengdu 610081, Sichuan, China;
2. College of Environments and Resources, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China) |
| Abstract: |
| The emphasis is placed upon the examination of the major elements, trace elements and REEs in the mudstone and approaches to the provenance and weathering in the Middle Jurassic Shaximiao Formation, Zigong, Sichuan. The study of major elements and REEs shows that the detritus are derived mostly from the felsic rocks in the source areas. The CIA (chemical index of alteration) and ICV (index of chemical variation) indexes suggest a low to moderate chemical weathering, implying that the study area was once in the semi-arid palaeoclimatic conditions during the Middle Jurassic. |
| Key words: Zigong Middle Jurassic geochemistry Sichuan Basin |
