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| 川东南地区志留系小河坝组砂岩特征及物源分析 | |
| 引用本文： | 朱志军,陈洪德.川东南地区志留系小河坝组砂岩特征及物源分析[J].吉林大学学报(地球科学版),2012,42(6):1590-1600. |
| 作者姓名： | 朱志军 陈洪德 |
| 作者单位： | 1.核资源与环境省部共建国家重点实验室培育基地（东华理工大学），南昌330013; 2.东华理工大学地球科学学院，江西 抚州344000; 3.成都理工大学沉积地质研究院，成都610059 |
| 基金项目： | 国家自然科学基金重点项目(40739901);核资源与环境教育部重点实验室开放基金项目(090909) |
| 摘 要： | 通过对川东南地区小河坝组砂岩的碎屑组分、岩屑类型、重矿物组合、地球化学（稀土元素、微量元素）及古流向的研究，分析了小河坝组砂岩的物源方向、母岩类型及源区的构造背景。结果显示：源区为盆地东边江南－雪峰山隆起西侧上元古界板板溪群及其侵入板溪群中的基性岩体、中基性喷出岩体。具有活动大陆边缘、大陆岛弧及被动大陆边缘的构造背景。地球化学研究进一步证明，母岩主要为更老的沉积岩再旋回沉积物及少量岩浆岩。在早志留世小河坝期以华南板块缓慢向扬子板块蠕动方式相拼接，致使扬子板块整体缓慢抬升，同时沉积中心不断向西北方向迁移，造成研究区具有明显沉积旋回性的物源供给特征。 |
| 关 键 词： | 川东南 志留系 小河坝组 物源分析 砂岩 地球化学 |
| 收稿时间： | 2012-04-04 |
Sandstone Characteristics and Provenance Analysis of the Sandstone in Silurian Xiaoheba Formation in Southeastern Sichuan Province,China |
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| Zhu Zhi-jun,Chen Hong-de.Sandstone Characteristics and Provenance Analysis of the Sandstone in Silurian Xiaoheba Formation in Southeastern Sichuan Province,China[J].Journal of Jilin Unviersity:Earth Science Edition,2012,42(6):1590-1600. | |
| Authors: | Zhu Zhi-jun Chen Hong-de |
| Institution: | 1.State Key Laboratory Breeding Base of Nuclear Resources and Environment(East China Institute of Technology)，Nanchang330013， China; 2.College of Geosciences ,East China Institute of Technology, Fuzhou344000, Jiangxi, China; 3.Institute of Sedimentary Geology,Chengdu University of Technology, Chengdu610059 ,China |
| Abstract: | Based on clastic compositions, debris types, heavy minerals,geochemistry (REE, trace elements)and paleocurrent of sandstone, the authors analyze source direction, rock type and tectonic settings of the source region of Xiaoheba Formation of southeastern Sichuan Province.The provenance derives from basic rocks, ultrabasic rocks, basic-intermediate effusive rocks of Neoproterozoic Banxi Group of the west wing of Xuefengshan uplift in east of basin. Tectonic background of source area includes active continental margin, continentalarc-islandsand passive continental margin.Source rock is mainly composed of older recycled sedimentary deposits of uplifted basement rock.South China plate and Yangtze plate spliced by slowly creeping of South China plate toward the Yangtze plate in the Early Silurian Xiaoheba Period,and resulted in slow uplift of whole Yangtze plate,meanwhile, the depocenter migrated continuously to the northwest,thus formed the cycles of supply source inresearch area. |
| Keywords: | southeastern Sichuan Province Silurian Xiaoheba Formation provenance analysis sandstone geochemistry |
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