Provenance and origin of the Late Cenozoic Dayi conglomerates in the western margin of the Sichuan Basin: New insights from heavy mineral and spore-pollen assemblages
文献类型：期刊论文
| 作者 | Zheng Yong1,2; Kong Ping1 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-08-01 |
| 卷号 | 29期号:8页码:2949-2958 |
| 关键词 | Dayi Conglomerates Heavy Mineral Assemblage Spore-pollen Assemblage Glaciofluvial Deposits The Min River Tibetan Plateau |
| 文献子类 | Article |
| 英文摘要 | The collision between Indian and Eurasian plates initiated in the Early Cenozoic produced the high Tibetan Plateau. Accompanied with the uplift of the Tibetan Plateau Tertiary sediments are almost absent in the adjacent Sichuan Basin, and the preserved oldest deposits are the Late Cenozoic Dayi conglomerates. Therefore, Dayi conglomerates can potentially provide information on palaeoenvironments and tectonic evolution of the Tibetan Plateau and adjacent areas. This paper reports heavy mineral compositions and spore-pollen assemblage within three Dayi conglomerates and a modern sand sample from the bank of the Min River and attempts to understand the origin of Dayi conglomerates through provenance analysis and sedimentation environment studies. Dayi conglomerates contain a variety of heavy minerals, which suggests that the provenance of the Dayi conglomerates covers a wide range of petrologic types. Except for extremely unstable minerals, the similarity in heavy mineral compositions between a newly exposed Dayi conglomerate and the modern sand from the Min River suggests that the Dayi conglomerates were delivered to the Sichuan Basin by the Min River, and during which time the Min River already dissected the Longmen Shan and was sourced to Songpan-Ganzi flysch belt. Garnet rarely occurs in natural profiles of Dayi conglomerates and we attribute this to intense weathering in an acidic environment. Spore-pollen is very scarce in the Dayi conglomerates with a concentration of 0. 2 grains/g. Species are mostly derived from alpine coniferous forest and a few from deciduous broad-leaf and herbaceous plants. Such an assemblage reflects cold environment. Together with available chronological data for the Dayi conglomerates, we prefer that the Dayi conglomerates are glaciofluvial deposits formed similar to 2. 0Ma ago. Formation of Dayi conglomerates reflects Early Quaternary cold environment in the eastern margin of the Tibetan Plateau. |
| WOS关键词 | HEMISPHERE ICE SHEETS ; NORTH-SEA ; TIBETAN PLATEAU ; ROCK-UPLIFT ; SANDSTONES ; SEDIMENTS ; DEFORMATION ; DIAGENESIS ; EVOLUTION ; BELT |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000323689100030 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62655]  |
| 专题 | 地质与地球物理研究所_地球深部结构与过程研究室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earths Deep Interior, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng Yong,Kong Ping. Provenance and origin of the Late Cenozoic Dayi conglomerates in the western margin of the Sichuan Basin: New insights from heavy mineral and spore-pollen assemblages[J]. ACTA PETROLOGICA SINICA,2013,29(8):2949-2958. |
| APA | Zheng Yong,&Kong Ping.(2013).Provenance and origin of the Late Cenozoic Dayi conglomerates in the western margin of the Sichuan Basin: New insights from heavy mineral and spore-pollen assemblages.ACTA PETROLOGICA SINICA,29(8),2949-2958. |
| MLA | Zheng Yong,et al."Provenance and origin of the Late Cenozoic Dayi conglomerates in the western margin of the Sichuan Basin: New insights from heavy mineral and spore-pollen assemblages".ACTA PETROLOGICA SINICA 29.8(2013):2949-2958. |
入库方式： OAI收割
来源：地质与地球物理研究所
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