| 南岭及邻区第四纪地层分区与综合地层格架 |
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| 引用本文： | 史元润,林晓,徐亚东,余舒超,孙清泉.南岭及邻区第四纪地层分区与综合地层格架[J].地质科技通报,2021,40(3):151-162. |
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| 作者姓名： | 史元润 林晓 徐亚东 余舒超 孙清泉 |
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| 基金项目： | 中国地质调查局项目DD20190811国家自然科学基金项目41571189 |
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| 摘 要： | 南岭及邻区的第四纪沉积以冲积物、残积物和洞穴堆积物为主，长期以来缺乏统一的地层格架和时间框架。基于剖面资料和实地调查，将南岭第四纪地层划分为永州-郴州、桂林-贺州、韶关-清远、赣州、道县-阳山等5个地层小区；通过厘定每个小区的岩石地层序列、生物地层和气候地层及其测年成果，建立了综合地层的对比格架。结果表明，南岭第四系与中国更新统泥河湾阶、周口店阶、萨拉乌苏阶和尚未建阶的全新统可一一对比；其生物地层以早更新世巨猿动物群和中更新世晚期以来的马坝人、道县人和柳江人等智人演化为特点；气候地层以洞穴石笋和高山泥炭重建的古气候记录为代表，主要反映东亚季风背景下的南岭局地气候。但由于测年数据较少，冲积层和残积层的对比仍然存在困难；生物演化阶段与气候变化之间也未能详细对比。因此，今后南岭的第四纪地层研究应围绕提高测年精度与建立统一的年代标尺开展，促进综合地层对比的精细化、延伸气候地层的时间尺度并拓展与南海海相地层的对比；这一基础性工作对水文、环境、工程等实践应用亦具有重要意义。
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| 关 键 词： | 地层分区 地层对比 第四纪 南岭 |
| 收稿时间： | 2020-12-21 |
Quaternary stratigraphic regionalization and comprehensive framework in Nanling and adjacent areas |
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| Abstract: | The Quaternary sediments in the Nanling and adjacent areas are dominated by alluvial, eluvium and cave deposits, which have lacked of a unified stratigraphic and chronological framework.Based on the results of field survey and research on profiles, the Quaternary strata of Nanling area has been divided into five stratigraphic minor regions: Yongzhou-Chenzhou, Guilin-Hezhou, Shaoguan-Qingyuan, Ganzhou and Daoxian-Yangshan minor region.Meanwhile, the framework of comprehensive strata determined by the lithostratigraphic sequence, biostratigraphy, chronostratigraphic and climatic data has also been established.The results show that the Quaternary System in Nanling area can be compared with the Nihewan Stage, Zhoukoudian Stage, Sarawusu Stage of Pleistocene Series and the unbuilt stage of Holocene Series in China.Its biostratigraphy is characterized by the Gigantopithecus Fauna of Early Pleistocene and the Homo sapiens such as Maba, Daoxian, Liujiang hominin since the late Middle Pleistocene.The climatic stratigraphy are represented by the glacial-interglacial cycle and the local climatic characters in the background of the East Asian monsoon, which were reconstructed by alpine peat and stalagmites deposited from the late Pleistocene.However, the comparison between alluvial and eluvium remains difficult due to the lack of dating data.There is also no detailed comparison between the biological evolution stages and climatic stages.Therefore, the Quaternary stratigraphic research in Nanling should focus on improving the dating precision and establishing a unified time scale in the future in order to promote the refinement of comprehensive stratigraphy comparison.The comparison between continental sediments and marine strata in the South China Sea should be expanded.And it can be used as the basis of applications in hydrological, environmental and engineering geology in Nanling and adjacent areas. |
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