|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 苏北平原沉积孢粉组合记录的全新世气候突变显示文摘通过中国东部苏北平原厚3.4 m的PM4剖面孢粉分析结果,重建了该地区全新世以来古植被更替过程,查明了5.20~3.00 cal.ka B.P.中国东部沿海平原百年尺度的海平面变化历史,并探讨了沿海平原植被对海平面变化的响应。孢粉结果表明,全新世以来该地区的植被与气候经历了以下5个阶段:1)11.90~8.80 cal.ka B.P.,亚热带常绿、落叶阔叶混交林繁盛,气候温暖湿润;2)8.80~7.40 cal.ka B.P.,发育了常绿、落叶阔叶混交林-草地,气候相对冷干;3)7.40~5.20 cal.ka B.P.,植被为常绿、落叶阔叶混交林,温度降低,降水增加;4)5.20~1.08 cal.ka B.P.,植被退化为盐生草甸;5)1.08 cal.ka B.P.以来植被中湿生草本群落繁盛。根据藜科、蒿属、禾本科和莎草科花粉的含量变化及粒度、有孔虫特征重建了相对海平面的变化历史,5.20~4.55 cal.ka B.P.、4.25~4.05 cal.ka B.P.与4.55~4.25 cal.ka B.P.、4.05~3.00 cal.ka B.P.分别为海平面上升和下降的阶段。研究区4.25~4.05 cal.ka B.P.海平面上升可与大范围尺度的'4.2 ka B.P.气候事件'相对应,可能受到了当时东亚季风减弱、苏北平原强降水与大规模洪水事件的共同驱动。 | 程瑜 李向前 乔彦松 张祥云 赵增玉 郭刚 | 2019 | 第四纪研究2019，39，3： | 5 |
| 2 | 新疆地区全新世环境考古研究进展及未来趋势显示文摘新疆地区是开展全新世环境考古研究的理想地域之一。对新疆地区史前文化时空分布特征研究表明,史前遗址分布空间增大趋势明显,特别是早期铁器时代,沿天山北坡,自东向西不断向西天山扩展。史前文化的分布与环境变化存在密切关系,史前文化演化与环境演变在时间上同步。对比该区域环境演变研究结果表明,新石器时代遗址的分布与气候冷、干,环境恶化有关,早期铁器时代的向西扩展是在环境适宜背景下进行的。新疆地区史前文化发展、空间扩张与环境变化高度相关,气候变化是引起这种变化的深层次原因。因此,气候是引起新疆地区史前文化变迁的重要因素,对文化的分布、传播等产生了重要影响。经过学者们近20年的努力,该区域史前环境考古研究取得了重大成就,文化演化的环境背景逐渐清晰,数字环境考古也有所涉及,人地关系综合集成研究取得一系列重要进展。但新疆地区史前环境考古研究仍然存在较大提升空间,受研究材料和研究方法限制,缺乏高分辨率古环境重建研究成果,全新世环境演变过程仍有争议;侧重自然环境变化对人类文明进程影响研究,人类对环境变化特别是对气候突变事件所做的积极响应,人类反作用于自然环境产生的环境效应研究略显单薄;聚落环境考古也有待突破。另外,随着“3S”技术在环境考古领域的应用,人地关系数字化、模型化研究迫切需要更多学者加入研究队伍中来。 | 姚付龙 朱诚 马春梅 | 2019 | 山地学报2019，37，4： | 4 |
| 3 | MIS 5以来长江三角洲地区沉积环境演变的光释光年代证据显示文摘长江三角洲是我国东部陆架-海岸沉积体系的重要组成部分,是研究三角洲环境演化和人类活动的理想区域之一。前期大量的研究成果主要聚焦于冰后期和全新世长江三角洲响应海面上升的演进过程,而冰期-间冰期尺度的长江三角洲地区沉积环境变化的研究因年代学工作薄弱而进展缓慢。本文在近年来对长江三角洲地区晚第四纪沉积物开展一系列石英OSL和钾长石(混合矿物)红外释光(pIRIR)测年研究,且已取得一定的释光测年数据的基础上,简要地梳理和总结长江三角洲末次间冰期以来区域沉积环境演化的研究进展,着重分析晚更新世以来长江三角洲南北两翼沉积地层的年代框架异同、释光年代约束下末次冰期长江古下切河谷的演化历史及成因。释光测年及区域地层对比研究结果表明:1)氧同位素(MIS)5e阶段(130~120ka)和全新世,长江三角洲地区沉积环境受海洋作用影响比较明显。2)MIS 3阶段是否存在海侵环境,不同测年技术得出了不同的年代学结论。且认为^(14)C和常规的石英OSL测年得到的末次冰期早期地层(MIS 3~4)的年龄很可能都存在低估,而钾长石或混合矿物红外释光测年可以发挥一定的测年优势。这也需要后期继续强化区域地层的年代学测试和对比研究。3)在MIS 4/2阶段,长江三角洲南北两侧及主体平原均以陆相沉积环境为主。本研究结果可为全球或区域性大河三角洲及海岸系统响应末次间冰期以来海面变化的沉积历史对比研究提供参考。 | 高磊 隆浩 | 2023 | 第四纪研究2023，43，1： | 1 |
| 4 | 中国晚新生代构造-沉积-古气候事件的地质记录显示文摘中国区域地质调查工作的重点正在转向大面积覆盖区为主的平原、盆地、草原、荒漠等地区,向深部三维调查拓展.第四纪松散沉积层覆盖区区域地质调查的核心是揭示晚新生代地表过程、圈层相互关系,探讨人与自然的关系,服务于国家生态文明建设与生态环境保护.然而,覆盖区进行地质填图一个很大的难处是第四纪松散沉积层的侧向延伸往往很不稳定,要特别重视重要构造-沉积-古气候和古环境事件,如重要的不整合面、侵蚀面、火山岩层、湖相沉积,重要的海侵层、古气候沉积(如黄土、红土、黑土),古文化层等.它们可以作为第四纪松散沉积层侧向对比的重要标志,并且往往具有等时性.东亚大陆构造演化及现代地貌特征主要受两大地球动力系统所控制,西部印度-欧亚板块碰撞、高原快速隆升并向北东方向扩展,东部太平洋板块向欧亚大陆俯冲消减并在东亚大陆东缘形成复杂的沟-弧-盆系统.两大构造系统作用奠定了晚新生代以来中国地质演化背景,导致地球深部过程和地表环境发生重大变革.总体表现为青藏高原隆升、东部岩石圈伸展减薄,最终塑造了现今的宏观地貌形态和水系格局.本文针对第四纪松散沉积物覆盖层的这些特点,对中国晚新生代以来重要构造-沉积-古气候事件进行了梳理,总结了晚新生代这些重要事件的地质记录,特别是重要的沉积层、侵蚀面、不整合面、海侵层等,以便在覆盖区区域地质调查时对第四纪松散沉积层进行区域性对比. | 胡健民 闫纪元 程瑜 刘晓波 | 2022 | 地质与资源2022，31，3： | 1 |
| 5 | Hydrological Variations and the Ancient Silk Road in the Northern Tarim Basin between Han and Sui Dynasties显示文摘The fluctuation pattern of China’s civilization can be ascribed to climate change and historical geopolitical variations. The ancient Silk Road served as the most prosperous route connecting East Asia and Europe during Han Dynasty(206 BC–220 AD) and Sui-Tang Dynasties(581–907 AD), but was deserted in Wei, Jin, Northern and Southern dynasties(220–580 AD), of which the Tarim Basin was a key area. However, our understanding about the decline of the route during this period remains limited. Here, we present an ~7-year resolution record based on optically stimulated luminescence(OSL) age-depth model(ca. 120 BC–750 AD) from Luntai(LT) profile, about 5 km from the modern Tarim River, which fed the ancient oases, to assess the potential causes on the documented decline of the ancient Silk Road between Late Han and Sui dynasties. In this study, five episodes of hydrological change were identified by combining grain size, magnetic susceptibility, geochemistry and TOC/TN contents. Our reconstruction reveals that cold and wet climate dominated at 120 BC–50 AD and 550–750 AD, respectively, indicated by strong hydrodynamic conditions. Relatively warm and humid climate occurred at 120–550 AD, between Eastern Han and Sui-Tang dynasties, indicating a better and more suitable local environment. A comparison between the studied region and other areas of China demonstrates that the paleoclimatic variations in eastern and western China exhibit rough discrepancies, and the hydrological conditions in arid region is inconsistent with the decline of ancient Silk Road in the northern Tarim Basin. We suggest that political and societal factors are the key issues that caused the interruption of Silk Road during Wei, Jin, Northern and Southern dynasties, such as the co-occurrence of societal crises, turmoil and division in eastern China, rather than the deteriorating climatic condition in the northern Tarim basin. | Lü Fenglin ZHANG Hua HOU Juzhi CAO Xianyong LIU Chenglin | 2020 | Acta Geologica Sinica(English Edition)2020，94，3： | 0 |
| 6 | Quaternary Stratigraphic Division and Paleoenvironmental Evolution Observed from Core LZK1 on Hengsha Island, Shanghai显示文摘The Quaternary sediments in the Yangtze delta are loose and lack precise stratification marks in the lithology. Moreover, due to the limitations of dating methods, it is difficult for Quaternary cores to deliver accurate age constraints. Thus, it is a challenge to establish the Quaternary stratigraphic framework. Gravity core LZK1 was drilled on Hengsha Island, Shanghai, in the Yangtze delta, in 2012. The core was terminated at 403.83 m below the local land surface, the uppermost 291.2 m comprising a thick sequence of Quaternary sediments. This study investigated the stratigraphic subdivision and paleoenvironmental change of the Quaternary sediments. From bottom to top, the Quaternary stratigraphic sequence can be subdivided into the lower Pleistocene Anting Formation, Middle Pleistocene Jiading Formation, Upper Pleistocene Chuansha Formation and Nanhui Formation, Holocene Loutang Formation, Shanghai Formation, and Rudong Formation. According to this study, the Hengsha Island area was dominated by a freshwater lacustrine environment during the early Pleistocene, an alternation of shallow lake and shore lake environment during the Middle Pleistocene, a delta plain to lagoonal environment during the early Upper Pleistocene, a fluvial channel to floodplain environment from the LGM(Last Glacial Maximum) to the end of the Upper Pleistocene, and a delta environment during the Holocene. | KE Xue XIE Jianlei ZHANG Zongyan ZOU Yarui WANG Guoquan | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 0 |
| 7 | Transgressive Events since the Late Pleistocene in the Yellow River Delta: Grain-size Distribution and Palynological Results显示文摘This study deals with the relationship between sea-level changes and paleoclimatic fluctuations based on the analysis of stratigraphy, grain sizes, palynology, and radiometric dating of the Yellow River delta since the Late Pleistocene. Evidence from the sedimentary record, grain sizes, and pollen provides a paleoenvironmental history of the Late Pleistocene from the boreholes of the delta. Based on a combination of grain-size analysis with lithological studies, marine deposit units contain the intervals of 13.85–16.9, 18.5–19.69, 27.9–34.8, 36.4–37.2, 48.4–51.6, and 54.1–55.9 m, and transitional facies units contain the intervals of 10.25–13.85, 16.9–18.5, 19.69–27.9, 34.8–36.4, 37.2–48.4, 51.6–54.1, and 55.9–60 m, compared with fluvial(terrestrial facies) deposit units(3.36–10.25 m). Based on pollen analysis and pollen assemblages, there were three warm-wet periods from 9.1–0.16 ka BP, 16.1–60 ka BP, and 90.1–94.6 ka BP From the top to the bottom of the borehole, the paleoclimate has an evident fluctuation: warm and moist(Holocene Optimum) —cool and dry(Younger Dryas Event)—mild semi cool—cool and dry—warm and moist. There were three warm-wet periods from 9.1–0.16 ka BP, 16.1–60 ka BP, and 90.1–94.6 ka BP, corresponding to the Holocene Optimum stage, MIS 3, and MIS 5, respectively. The warm period allowed monsoonal evergreen and broadleaved deciduous forests that corresponded to Holocene hypsithermal climatic conditions and the Late Pleistocene climatic Optimum. Three warm-wet periods occurred in marine deposit units from 9.1–0.16 ka BP, 60.1–16.1 ka BP, and 94.6–90.1 ka BP. These periods correspond to the Cangzhou transgression, Xianxian transgression, and Huanghua transgression, respectively. From 90.1–60.1 ka BP, 17.5–9.1 ka BP, and 0. 16 ka BP–1855 AD, three dry and cold phases are recognized. The phases indicate the fluvial(flood plain) sedimentary environment, corresponding to cooler and mild dry periods based on palynological results and grain-size distribution. | LU Jingfang LIU Jian HUANG Wei HU Gang ZHANG Daolai John BIRKS | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员