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Editorial: E&G Quaternary Science Journal – a community-based open-access journal 编辑:E&G 第四纪科学杂志--基于社区的开放获取期刊
Pub Date : 2020-01-16 DOI: 10.5194/egqsj-68-243-2020
C. Lüthgens, D. Sauer, M. Zech, Becky Briant, E. Brown, E. Dietze, M. Fuchs, N. Klasen, S. Lukas, J. May, J. Meister, T. Reimann, G. Rixhon, Zsófia Ruszkiczay-Rüdiger, B. Salcher, Tobias Sprafke, I. Unkel, H. von Suchodoletz, C. Zeeden
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引用次数: 0
Combining geomorphological–hydrological analyses and the location of settlement and raw material sites – a case study on understanding prehistoric human settlement activity in the southwestern Ethiopian Highlands 结合地貌水文分析和定居点和原材料地点的位置——一个了解埃塞俄比亚西南部高地史前人类定居点活动的案例研究
Pub Date : 2019-10-17 DOI: 10.5194/egqsj-68-201-2019
Elena A. Hensel, Oliver Bödeker, O. Bubenzer, R. Vogelsang
Abstract. During this study, the recent relations between thehydrological systems and the distribution of archaeological sites andobsidian raw material outcrops within the catchment of the Bisare River,around Mt Damota, and around Mt Sodicho in the southwestern EthiopianHighlands were investigated. To do so, we combinedgeomorphological–hydrological analyses with field surveys and GIS mapping.The aim was to try to transfer these recent interrelations into the past tobetter understand the factors that influenced prehistoric human settlementactivity. The natural geomorphodynamics in landscapes such as thesouthwestern Ethiopian Highlands were and still are characterized by theinterplay between endogenous processes (tectonics, volcanism) and climaticfluctuations and, during the recent past, also by human activity. In theconsidered region, protective and potentially habitable rock shelters arefound at the volcanic slopes of Mt Damota and Mt Sodicho at highelevations. In addition, in some areas recent morphodynamic processes makeobsidian raw material available near the surface. However, archaeologicaland terrestrial paleoenvironmental archives that allow an understanding ofthe interplay between prehistoric settlement activity and paleoenvironmentalconditions are still rare. Therefore, the surroundings of formerly occupiedrock shelters were investigated to illustrate the effect of the recentfluvial morphodynamics (erosion and accumulation) on surface visibility andpreservation of archaeological obsidian raw material. This recentinformation can be used to make assumptions about the former hydrologicalsystem and to thereby get answers to research questions such as those about thepast accessibility of obsidian raw material for prehistoric humans. Theresults suggest that the study area is currently affected by a highlydynamic hydrological system, which is indicated by phenomena such as theformation of swamps due to sedimentation in natural depressions. Inaddition, wide areas of the Bisare River catchment are affected by gullyerosion, which leads to land degradation but also to the exposure of theabove-mentioned lithic raw material outcrops. Human influence stronglyincreased during the Holocene until today, especially on the mountainflanks. This in turn increased soil loss and erosion of archaeologicalsites, which complicates the transfer of the current morphodynamics into thepast. Although it cannot be finally confirmed that prehistoric hunters andgatherers systematically used fluvially exposed raw material, based on ourresults it can be assumed that humans frequented this area, due to the localavailability of such kind of material.
摘要在这项研究中,研究人员调查了埃塞俄比亚西南部高原的Bisare河流域、Damota山周围和Sodicho山周围的考古遗址和多曜石原料露头分布与水文系统之间的最新关系。为此,我们将地貌水文分析与实地调查和GIS制图相结合。其目的是试图将这些最近的相互关系转移到过去,以更好地了解影响史前人类定居活动的因素。埃塞俄比亚高原西南部等地的自然地貌动力学过去和现在仍然以内生过程(构造、火山活动)和气候波动之间的相互作用为特征,在最近的过去,也受到人类活动的影响。在考虑的地区,在高海拔的达莫塔山和索迪科山的火山斜坡上发现了保护性和潜在的可居住岩石避难所。此外,在某些地区,最近的形态动力学过程使接近地表的黑曜石原料成为可能。然而,考古和陆地古环境档案,使史前定居活动和古环境条件之间的相互作用的理解仍然很少。因此,研究人员调查了以前被占领的岩石掩蔽处的周围环境,以说明最近的河流形态动力学(侵蚀和堆积)对表面可见性和考古黑曜石原料保存的影响。这些最新的信息可以用来对以前的水文系统做出假设,从而得到一些研究问题的答案,比如史前人类过去能否获得黑曜石原料。结果表明,研究区目前受到高度动态水文系统的影响,这可以通过自然洼地沉积形成沼泽等现象来表明。此外,比萨雷河流域的广大地区受到沟壑侵蚀的影响,这不仅导致土地退化,而且还暴露了上述岩石原料露头。从全新世到今天,人类的影响大大增加,尤其是在山腰。这反过来又增加了土壤流失和考古遗址的侵蚀,使当前形态动力学向过去的转移变得复杂。虽然不能最终证实史前猎人和采集者系统地使用河流暴露的原材料,但根据我们的结果,可以假设人类经常光顾这个地区,因为这种材料在当地是可获得的。
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引用次数: 9
Chemotaxonomic patterns of vegetation and soils along altitudinal transects of the Bale Mountains, Ethiopia, and implications for paleovegetation reconstructions – Part 1: stable isotopes and sugar biomarkers 埃塞俄比亚贝尔山脉沿海拔样带植被和土壤的化学分类模式及其对古植被重建的意义。第1部分:稳定同位素和糖生物标志物
Pub Date : 2019-09-04 DOI: 10.5194/egqsj-68-177-2019
B. Mekonnen, W. Zech, B. Glaser, B. Lemma, Tobias Bromm, S. Nemomissa, T. Bekele, M. Zech
Abstract. Today, on the Sanetti Plateau in the Bale Mountains of Ethiopia, only fragmented patches of Erica species can be found at high altitudes (between 3900 and 4200 m a.s.l.). However, it is hypothesized that during the later part of the last glacial period and the early Holocene the plateau was extensively covered by Erica shrubs. Furthermore, it is assumed that the vegetation was later heavily destroyed by human-induced fire and/or climate change phenomena. The objective of this study is to contribute to paleovegetation reconstructions of the Sanetti Plateau by evaluating the potential of stable isotopes (δ13C and δ15N) and sugar biomarkers for distinguishing the dominant plant species, including Erica, and the soils below the plants. In a companion paper (Lemma et al., 2019a) we address the same issue by evaluating lignin-derived phenols and leaf-wax-derived n-alkane biomarkers. The stable carbon (δ13C) and nitrogen (δ15N) isotope values of the plant samples range from −27.5  ‰ to −23.9  ‰ and −4.8  ‰ to 5.1  ‰, respectively. We found no significant δ13C and δ15N differences between the dominant plant species. Mineral topsoils (Ah horizons) yielded more positive values than plant samples and organic layers (O layers), which reflects mineralization processes. Moreover, the δ15N values became generally more negative at higher altitudes. This likely indicates that the N cycle is more closed compared to lower altitudes. δ15N maxima around 4000 m a.s.l. point to fire-induced opening of the N cycle at the chosen study sites. Erica species yielded the lowest overall total sugar concentration (ranging from 58 to 118 mg g−1), dominated by galactose (G) and mannose (M). By contrast, Festuca species revealed much higher total sugar concentrations ranging from 104 to 253 mg g−1, dominated by the pentose sugars arabinose (A) and xylose (X). Although a differentiation between Erica versus Festuca, Alchemilla and Helichrysum is possible based on (G + M) ∕ (A + X) ratios, Erica cannot be unambiguously distinguished from all other plant species occurring on the Sanetti Plateau. In addition, plant-characteristic (G + M) ∕ (A + X) sugar patterns change during soil organic matter formation in the Ah horizons. This can be likely attributed to degradation effects and soil microbial build-up of galactose and mannose. In conclusion, soil degradation processes seem to render sugar biomarker proxies unusable for the reconstruction of the past extent of Erica on the Sanetti Plateau, Bale Mountains, Ethiopia. This finding is of relevance beyond our case study.
摘要今天,在埃塞俄比亚贝尔山脉的萨内蒂高原上,在高海拔地区(海拔高度在3900米至4200米之间)只能找到零星的埃里卡物种。然而,在末次冰期后期和全新世早期,高原被埃里卡灌木广泛覆盖。此外,假定植被后来被人为引起的火灾和/或气候变化现象严重破坏。本研究旨在通过稳定同位素(δ13C和δ15N)和糖生物标记物的潜力来区分包括Erica在内的优势植物物种和植物下的土壤,为Sanetti高原的古植被重建做出贡献。在另一篇论文(Lemma et al., 2019a)中,我们通过评估木质素衍生的酚类和叶蜡衍生的正构烷烃生物标志物来解决同样的问题。植物样品的稳定碳(δ13C)和氮(δ15N)同位素值分别在−27.5‰~−23.9‰和−4.8‰~ 5.1‰之间。不同优势种间δ13C和δ15N无显著差异。矿物表层土(Ah层)比植物样品和有机层(O层)具有更高的正值,反映了矿化过程。δ15N值在海拔越高越负。这可能表明,与较低海拔相比,N周期更封闭。δ15N最大值在4000 m a.s.l左右。指出在选定的研究地点,火灾导致了N循环的打开。Erica种的总糖浓度最低(从58到118 mg g - 1),主要是半乳糖(g)和甘露糖(M)。相比之下,Festuca种的总糖浓度要高得多,从104到253 mg g - 1,主要是戊糖阿拉伯糖(A)和木糖(X)。尽管Erica与Festuca、Alchemilla和helichryum之间的差异可能基于(g + M)∕(A + X)比率,埃里卡不能与萨内蒂高原上的所有其他植物物种明确区分开来。此外,植物特征(G + M)∕(A + X)糖模式在Ah层土壤有机质形成过程中也发生了变化。这可能归因于半乳糖和甘露糖的降解效应和土壤微生物的积累。总之,土壤退化过程似乎使糖生物标志物无法用于重建埃塞俄比亚贝尔山脉Sanetti高原上Erica过去的范围。这一发现的相关性超出了我们的案例研究。
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引用次数: 10
Chemotaxonomic patterns of vegetation and soils along altitudinal transects of the Bale Mountains, Ethiopia, and implications for paleovegetation reconstructions – Part II: lignin-derived phenols and leaf-wax-derived n-alkanes 埃塞俄比亚贝尔山脉沿海拔样带植被和土壤的化学分类模式及其对古植被重建的意义。第2部分:木质素衍生的酚类和叶蜡衍生的正构烷烃
Pub Date : 2019-09-04 DOI: 10.5194/egqsj-68-189-2019
B. Lemma, B. Mekonnen, B. Glaser, W. Zech, S. Nemomissa, T. Bekele, L. Bittner, M. Zech
Abstract. Erica is a dominant vegetation type in many sub-afroalpine ecosystems, such as the Bale Mountains in Ethiopia. However, the past extent of Erica is not well known and climate versus anthropogenic influence on altitudinal shifts are difficult to assign unambiguously, especially during the Holocene. The main objective of the present study is to chemotaxonomically characterize the dominant plant species occurring in the Bale Mountains using lignin phenols and n-alkane biomarkers and to examine the potential of those biomarkers for reconstructing vegetation history. Fresh plant material, organic layer and mineral topsoil samples were collected along a northeastern and a southwestern altitudinal transect (4134–3870 and 4377–2550 m a.s.l., respectively). Lignin-derived vanillyl, syringyl and cinnamyl phenols were analyzed using the cupric oxide oxidation method. Leaf-wax-derived n-alkanes were extracted and purified using Soxhlet and aminopropyl columns. Individual lignin phenols and n-alkanes were separated by gas-chromatography and detected by mass spectrometry and flame ionization detection, respectively. We found that the relative contributions of vanillyl, syringyl and cinnamyl phenols allow us to chemotaxonomically distinguish contemporary plant species of the Bale Mountains. Erica in particular is characterized by relatively high cinnamyl contributions of >40 %. However, litter degradation strongly decreases the lignin phenol concentrations and completely changes the lignin phenol patterns. Relative cinnamyl contributions in soils under Erica were <40 %, while soils that developed under Poaceae (Festuca abyssinica) exhibited relative cinnamyl contributions of >40 %. Similarly, long-chain n-alkanes extracted from the leaf waxes allowed for differentiation between Erica versus Festuca abyssinica and Alchemilla, based on lower C31 ∕ C29 ratios in Erica. However, this characteristic plant pattern was also lost due to degradation in the respective O layers and Ah horizons. In conclusion, although in modern-day plant samples a chemotaxonomic differentiation is possible, soil degradation processes seem to render the proxies unusable for the reconstruction of the past extent of Erica on the Sanetti Plateau, Bale Mountains, Ethiopia. This finding is of high relevance beyond our case study.
摘要埃里卡是许多亚非洲高山生态系统的主要植被类型,如埃塞俄比亚的贝尔山脉。然而,埃里卡过去的范围并不为人所知,气候与人为对海拔变化的影响很难明确地分配,特别是在全新世期间。本研究的主要目的是利用木质素酚类和正构烷烃类生物标志物对贝尔山脉的优势植物物种进行化学分类,并研究这些生物标志物在重建植被历史方面的潜力。在海拔高度分别为4134 ~ 3870 m和4377 ~ 2550 m的东北和西南样带采集了新鲜植物、有机层和矿物表土样品。分别)。采用氧化铜氧化法对木质素衍生的香兰基、丁香基和肉桂基酚进行了分析。用索氏柱和氨基丙基柱对叶蜡衍生的正构烷烃进行了提取和纯化。用气相色谱法分离木质素酚类化合物,用质谱法和火焰电离法检测木质素酚类化合物。我们发现香草基、丁香基和肉桂基酚的相对贡献使我们能够在化学分类上区分贝尔山当代植物物种。尤其是艾丽卡,肉桂基的贡献相对较高,> 40%。而凋落物的降解则使木质素酚浓度显著降低,并彻底改变了木质素酚的形态。在Erica土壤中肉桂基的相对贡献为40%。同样,从叶蜡中提取的长链正链烷烃可以区分埃里卡与羊茅和炼金术,基于埃里卡中较低的C31 / C29比率。然而,由于各O层和Ah层的退化,这种特征的植物格局也丧失了。总之,尽管在现代植物样本中,化学分类分化是可能的,但土壤退化过程似乎使这些替代指标无法用于重建埃塞俄比亚贝尔山脉Sanetti高原上Erica过去的范围。这一发现与我们的案例研究高度相关。
{"title":"Chemotaxonomic patterns of vegetation and soils along altitudinal transects of the Bale Mountains, Ethiopia, and implications for paleovegetation reconstructions – Part II: lignin-derived phenols and leaf-wax-derived n-alkanes","authors":"B. Lemma, B. Mekonnen, B. Glaser, W. Zech, S. Nemomissa, T. Bekele, L. Bittner, M. Zech","doi":"10.5194/egqsj-68-189-2019","DOIUrl":"https://doi.org/10.5194/egqsj-68-189-2019","url":null,"abstract":"Abstract. Erica is a dominant vegetation type in many sub-afroalpine ecosystems, such as the Bale Mountains in Ethiopia. However, the past extent of Erica is not well known and climate versus anthropogenic influence on altitudinal shifts are difficult to assign unambiguously, especially during the Holocene. The main objective of the present study is to chemotaxonomically characterize the dominant plant species occurring in the Bale Mountains using lignin phenols and n-alkane biomarkers and to examine the potential of those biomarkers for reconstructing vegetation history. Fresh plant material, organic layer and mineral topsoil samples were collected along a northeastern and a southwestern altitudinal transect (4134–3870 and 4377–2550 m a.s.l., respectively). Lignin-derived vanillyl, syringyl and cinnamyl phenols were analyzed using the cupric oxide oxidation method. Leaf-wax-derived n-alkanes were extracted and purified using Soxhlet and aminopropyl columns. Individual lignin phenols and n-alkanes were separated by gas-chromatography and detected by mass spectrometry and flame ionization detection, respectively. We found that the relative contributions of vanillyl, syringyl and cinnamyl phenols allow us to chemotaxonomically distinguish contemporary plant species of the Bale Mountains. Erica in particular is characterized by relatively high cinnamyl contributions of >40 %. However, litter degradation strongly decreases the lignin phenol concentrations and completely changes the lignin phenol patterns. Relative cinnamyl contributions in soils under Erica were <40 %, while soils that developed under Poaceae (Festuca abyssinica) exhibited relative cinnamyl contributions of >40 %. Similarly, long-chain n-alkanes extracted from the leaf waxes allowed for differentiation between Erica versus Festuca abyssinica and Alchemilla, based on lower C31 ∕ C29 ratios in Erica. However, this characteristic plant pattern was also lost due to degradation in the respective O layers and Ah horizons. In conclusion, although in modern-day plant samples a chemotaxonomic differentiation is possible, soil degradation processes seem to render the proxies unusable for the reconstruction of the past extent of Erica on the Sanetti Plateau, Bale Mountains, Ethiopia. This finding is of high relevance beyond our case study.","PeriodicalId":11420,"journal":{"name":"E&amp;G Quaternary Science Journal","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84623630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
10Be-based exploration of the timing of deglaciation in two selected areas of southern Norway 在挪威南部选定的两个地区,对冰川消融时间的基于be的探索
Pub Date : 2019-07-30 DOI: 10.5194/EGQSJ-68-165-2019
P. Marr, S. Winkler, S. Binnie, J. Löffler
Abstract. We present new 10Be surface exposure ages from two selectedlocations in southern Norway. A total of five 10Be samples allow a firstassessment of local deglaciation dynamics of the Scandinavian Ice Sheet atDalsnibba (1476 m a.s.l.) in southwestern Norway. The bedrock ages from thesummit of Dalsnibba range from 13.3±0.6 to 12.7±0.5 kaand probably indicate the onset of deglaciation as a glacially transportedboulder age (16.5±0.6 ka) from the same elevation likely showsinheritance. These ages indicate initial deglaciation commencing at the endof the Bølling–Allerød interstadial (∼ 14.7–12.9 kyr BP)and ice-free conditions at Dalsnibba's summit during the Younger Dryas.Bedrock samples at lower elevations imply vertical ice surface lowering downto 1334 m a.s.l. at 10.3±0.5 ka and a longer overall period ofdownwasting than previously assumed. Two further 10Be samples add tothe existing chronology at Blåhø (1617 m a.s.l.) in south-central Norway. The 10Be erratic boulder sample on the summit of Blåhøsample yields 20.9±0.8 ka, whereas a 10Be age of 46.4±1.7 ka for exposed summit bedrock predates the Late Weichselian Maximum.This anomalously old bedrock age infers inherited cosmogenic nuclideconcentrations and suggests low erosive cold-based ice cover during the Last Glacial Maximum.However, due to possible effects of cryoturbation and frost heave processesaffecting the erratic boulder age and insufficient numbers of 10Besamples, the glaciation history on Blåhø cannot conclusively beresolved. Comparing the different timing of deglaciation at both locationsin a rather short west–east distance demonstrates the complex dynamics ofdeglaciation in relation to other areas in southern Norway.
摘要我们从挪威南部两个选定的地点提出了新的10Be表面暴露年龄。总共有5个10Be样品可以首次评估挪威西南部达尔斯尼巴(a.s.l 1476米)斯堪的纳维亚冰盖的局部冰消动力学。达尔斯尼巴峰顶的基岩年龄在13.3±0.6 ~ 12.7±0.5 ka之间,可能表明冰川消融的开始与同一海拔的冰川搬运巨石年龄(16.5±0.6 ka)相同,可能具有继承性。这些年龄表明,在b ølling - allero ød间冰期(~ 14.7-12.9 kyr BP)结束时开始了最初的冰川消融,在新仙女木时期达尔斯尼巴山顶处于无冰状态。较低海拔的基岩样品表明,垂直冰面下降至1334米。在10.3±0.5 ka和比先前假设的更长的总体降耗期。另外两个10Be样品补充了挪威中南部bl hoø (a.s.l 1617 m)的现有年代学。bl hø样品顶部的10Be不稳定巨石样品产生20.9±0.8 ka,而暴露的顶部基岩的10Be年龄为46.4±1.7 ka,早于晚魏奇selian极大期。这种异常古老的基岩年龄推断出继承的宇宙成因核素浓度,并表明末次盛冰期的低侵蚀性冷基冰盖。然而,由于低温扰动和冻胀过程可能影响不稳定的巨石年龄,以及样品数量不足,bl hot的冰川历史无法最终解决。比较这两个地点在相当短的西向东距离内的不同冰川消融时间,表明了与挪威南部其他地区相比,冰川消融的复杂动态。
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引用次数: 7
The formation of Middle and Upper Pleistocene terraces (Übergangsterrassen and Hochterrassen) in the Bavarian Alpine Foreland – new numeric dating results (ESR, OSL, 14C) and gastropod fauna analysis 巴伐利亚高山前陆中、上更新世阶地(Übergangsterrassen和Hochterrassen)的形成——新的数值定年结果(ESR、OSL、14C)和腹足动物区系分析
Pub Date : 2019-07-25 DOI: 10.5194/EGQSJ-68-141-2019
G. Schellmann, Patrick Schielein, W. Rähle, Christoph Burow
Abstract. Until now, reliable chronological classifications based on numerical ages for many Pleistocene fluvial deposits in the Alpine Foreland were rare. In this study, new numeric data (ESR, OSL, 14C) from Middle and Upper (Late) Pleistocene Hochterrassen (high terraces) and Übergangsterrassen (transitional terraces) in the Bavarian Alpine Foreland are presented. The dating results imply that the Hochterrassen gravel sensu stricto were deposited during the penultimate glacial (MIS 6, Rissian), and that underlying older gravel accumulation are predominantly of penultimate interglacial (MIS 7, Riss–Riss interglacial) age. In some areas of the Hochterrassen in the Danube valley south of Regensburg (interglacial Hartinger Schichten, Harting layers), and in some areas of the Rainer Hochterrasse (basal gravel unit I), Hochterrassen gravels are underlain by much older interglacial gravel deposits. These interglacial basal gravel deposits illustrate that the downcutting of these valleys far away from areas of Pleistocene foreland glaciations happened predominantly during warm-temperate interglacial or late-glacial periods. One last interglacial (MIS 5e, Riss–Würm interglacial) Hochterrasse is morphologically preserved in the Isar valley. This Jüngere Moosburger Hochterrasse is composed of the Fagotienschotter (Fagotia gravel, named after the gastropod Fagotia acicularis). The next younger terraces are the Early to Middle Würmian (MIS 5d to MIS 3?) Übergangsterrassen (transitional terraces), whereas the younger one of the two Übergangsterrassen was formed most probably during the Middle Würmian (MIS 3).
摘要到目前为止,基于数值年龄对阿尔卑斯前陆许多更新世河流沉积物进行可靠的年代学分类是罕见的。本文介绍了巴伐利亚高山前陆中、上(晚)更新世Hochterrassen(高阶地)和Übergangsterrassen(过渡阶地)的新的数值资料(ESR、OSL、14C)。测年结果表明,Hochterrassen砾石严格意义上的砾石沉积于第二末次冰期(MIS 6, Rissian),下伏较老的砾石堆积主要为第二末次间冰期(MIS 7, Riss-Riss间冰期)。在多瑙河河谷雷根斯堡以南的Hochterrassen的一些地区(间冰期的哈廷格-施赫特滕,哈廷层)和Rainer Hochterrasse的一些地区(基底砾石单元I), Hochterrassen砾石被更古老的间冰期砾石沉积物所覆盖。这些间冰期基底砾石沉积表明,这些远离更新世前陆冰川地区的山谷的下切主要发生在暖温带间冰期或晚冰期。最后一个间冰期(MIS 5e, riss - w rm间冰期)Hochterrasse在形态上保存在Isar山谷中。这个j ngere Moosburger Hochterrasse是由Fagotienschotter (Fagotia砾石,以腹足动物Fagotia acicularis命名)组成的。下一个较年轻的梯田是早至中叠层纪(MIS 5d - MIS 3?) Übergangsterrassen(过渡性梯田),而较年轻的一个Übergangsterrassen最有可能形成于中叠层纪(MIS 3)。
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引用次数: 0
Coastal lowland and floodplain evolution along the lower reaches of the Supsa River (western Georgia) 苏普萨河下游沿海低地和漫滩的演变(格鲁吉亚西部)
Pub Date : 2019-07-24 DOI: 10.5194/EGQSJ-68-119-2019
Hannes Laermanns, S. M. May, Daniel Kelterbaum, G. Kirkitadze, S. Opitz, Levan Navrozashvili, M. Elashvili, H. Brückner
Abstract. In the southernmost part of the Colchian plain (Georgia), the Supsa and Rioni rivers represent important catchments for reconstructing Holocene landscape changes. Using granulometric methods, geochemical analyses and radiocarbon dating, we demonstrate that significant palaeoenvironmental changes have taken place in the surroundings of the Supsa fan since at least 4000 BCE. The initial foothill fan accumulation was prolonged by delta plain progradation. Due to continued fluvial sediment supply, mainly from the Rioni, the lagoon silted up and extended peat bogs formed east of the beach ridge complex. The Supsa fan first prograded northwards (since the third millennium BCE) and later shifted westwards, eventually following an avulsion of the Rioni. While Supsa deposits remain limited to the area of the fan and the modern estuary, the alluvial fines of the Rioni dominate the surrounding areas. The relative sea-level (RSL) index points of the region suggest a gradual RSL rise from ∼-9 m between 4000 and 3500 BCE to −3/−2 m below the modern sea level in the second half of the first millennium BCE, the period during which Greek colonization and Colchian settlements are attested by archaeological remains.
摘要在佐治亚州科尔喀斯平原的最南端,苏萨河和里奥尼河是重建全新世景观变化的重要流域。通过颗粒测定法、地球化学分析和放射性碳测年,我们证明了至少在公元前4000年以来,苏普萨扇周围发生了显著的古环境变化。三角洲平原的进积延长了最初的山麓扇堆积。由于持续的河流沉积物供应(主要来自里奥尼河),泻湖淤塞,延伸的泥炭沼泽在海滩山脊综合体以东形成。苏萨扇首先向北推进(自公元前三千年以来),后来向西移动,最终随着里奥尼的撕裂。虽然苏萨沉积物仍然局限于扇和现代河口地区,但里奥尼的冲积粉层主导着周围地区。该地区的相对海平面(RSL)指数点表明,相对海平面在公元前4000年至3500年间从-9米逐渐上升到公元前1千年下半叶的现代海平面以下- 3/ - 2米,考古遗迹证实了希腊殖民和科尔喀斯定居点的时期。
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引用次数: 3
Archaeological dating of colluvial and lacustrine deposits in a GIS environment investigating the multi-period site Gortz 1 on Oberer Beetzsee, Brandenburg 在GIS环境下对勃兰登堡Oberer Beetzsee的多时期遗址Gortz 1进行的崩塌和湖泊沉积物的考古测年
Pub Date : 2019-07-18 DOI: 10.5194/EGQSJ-68-107-2019
J. Reichel, Sophie F. Heisig, T. Schenk, Thomas Schatz
Abstract. From the mid-14th century CE onwards, extensive soil erosion, caused byintensive agricultural practices, has led to the destruction of landscapestructures in Central Europe. In 2016, the University of Applied Sciences inBerlin investigated the colluvial deposits at the site of Gortz in westernBrandenburg (Germany), which had accumulated on the lower slopes and werecaused by the processes just mentioned. The mapping of each individual archaeological find made it possible toproject all finds onto one profile running along the slope. Transformationof the finds' coordinates from profile view to plan view enabled thevisualization in a Geographical Information System (GIS). The combination ofadjacent strata into larger units using a pedological and sedimentologicalapproach enabled an improved dating of colluvial deposits. In addition, themethod facilitated the dating of historical water levels in the Beetzseechain of lakes, which are part of the Havel river system. As a result, it could be demonstrated that substantial anthropogenicactivity, such as clay quarrying and bank straightening, took place duringthe Late Slavic Period. An interlocking horizon of colluvial and lacustrinedeposits indicates that the water level of the lake Oberer Beetzsee rose from avalue under 29.4 m above sea level (a.s.l.) in the 11th/12th century CE toapproximately 29.8 m a.s.l. in the 13th century CE. However, isolatedflooding events during the 13th century CE can be recorded up to a height of30.5 m a.s.l. A modern colluvial deposit of 1 m in thicknessindicates an acute endangerment of the archaeological site by modernagriculture.
摘要从公元14世纪中期开始,集约化的农业生产造成了大面积的水土流失,导致中欧的景观结构遭到破坏。2016年,柏林应用科学大学(University of Applied Sciences In berlin)对德国勃兰登堡西部戈尔茨(Gortz)遗址的崩塌沉积物进行了调查,这些沉积物积聚在较低的斜坡上,是由上述过程造成的。对每一个考古发现的测绘使得所有的考古发现都有可能在沿着斜坡的一条剖面上进行投影。将发现的坐标从剖面视图转换为平面视图,使其在地理信息系统(GIS)中可视化。利用土壤学和沉积学方法将相邻地层组合成更大的单元,可以改进对崩积矿床的定年。此外,该方法还有助于确定哈维尔河水系的一部分比茨湖的历史水位。因此,可以证明大量的人类活动,如粘土采掘和河岸矫直,发生在晚期斯拉夫时期。崩塌和湖泊沉积物的交错层位表明Oberer Beetzsee湖的水位从公元11 /12世纪海拔29.4 m (a.s.l)以下的值上升到大约29.8 m a.s.l。公元13世纪然而,公元13世纪的个别洪水事件可以记录到海拔30.5米的高度。1米厚的现代崩塌沉积物表明,现代农业对考古遗址造成了严重的危害。
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引用次数: 1
Holocene floodplain evolution in a central European loess landscape – geoarchaeological investigations of the lower Pleiße valley in NW Saxony 中欧黄土景观中全新世洪泛平原的演变——西北萨克森州Pleiße河谷下游的地质考古调查
Pub Date : 2019-07-15 DOI: 10.5194/EGQSJ-68-95-2019
C. Tinapp, S. Heinrich, Christoph Herbig, B. Schneider, H. Stäuble, J. Miera, H. von Suchodoletz
Abstract. Undisturbed sediments are an important source for the reconstruction of the Holocene development of valleys. Wide floodplains with relatively small rivers in a region settled since 5500 BCE offer opportunities for investigations regarding climatic and anthropogenic landscape change. In the context of a motorway construction, excavations were carried out by the Saxonian Heritage Office in the year 2015. At one of the sites it was possible to get a view of the sediments of the Pleiße valley less than 100 m distance from large cross sections described by Neumeister (1964) in a former open cast mine. Archaeological finds and features, plant remains and radiocarbon dating as well as micromorphological and geochemical investigations helped to decipher the age and the characteristics of the Holocene sediments: above Weichselian loamy sands a sedge peat developed in small depressions during the Preboreal and Boreal. The sands and the sedge peat are covered by a “black clay”, which was still the topsoil during the Atlantic period. The sedimentation of 2.3 m thick overbank fines began after 4000 BCE. A depth of 1 m below the surface a medieval Slavic find layer was excavated. These results show that sedimentation processes in the lower Pleiße valley significantly changed after 4000 BCE. It is obvious that the increase in silty material in the floodplain is caused by the land clearance in the Neolithic period. More than half of the silty overbank fines were deposited before the Middle Ages began.
摘要未扰动沉积物是重建全新世河谷发育的重要来源。在公元前5500年定居的地区,宽阔的洪泛平原和相对较小的河流为研究气候和人为景观变化提供了机会。在高速公路建设的背景下,萨克森遗产办公室于2015年进行了挖掘。在其中一个地点,可以看到Pleiße山谷的沉积物,距离Neumeister(1964)在一个前露天矿山中描述的大型横截面不到100米。考古发现和特征、植物遗骸、放射性碳定年以及微观形态和地球化学调查有助于解释全新世沉积物的年龄和特征:在前北方纪和北方纪的小洼地中,威奇塞利亚壤土砂上发育了一种莎草泥炭。沙子和莎草泥炭被一层“黑色粘土”覆盖着,这是大西洋时期的表土。2.3米厚的河岸砾石沉积始于公元前4000年以后。在地表以下1米深的地方挖掘出了一个中世纪斯拉夫发现层。这些结果表明,公元前4000年以后,Pleiße河谷下游的沉积过程发生了显著变化。很明显,洪泛区粉质物质的增加是新石器时代的土地清理造成的。超过一半的淤泥河岸罚金是在中世纪开始之前沉淀的。
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引用次数: 4
Neolithic settlement dynamics derived from archaeological data and colluvial deposits between the Baar region and the adjacent low mountain ranges, southwest Germany 德国西南部巴尔地区和邻近的低山脉之间的考古数据和崩塌沉积物得出的新石器时代定居动态
Pub Date : 2019-06-27 DOI: 10.5194/EGQSJ-68-75-2019
J. Miera, Jessica Henkner, K. Schmidt, M. Fuchs, T. Scholten, P. Kühn, Thomas Knopf
Abstract. The present study combines archaeological data witharchaeopedological data from colluvial deposits to infer Neolithicsettlement dynamics between the Baar region, the Black Forest and the Swabian Jura.A review of the state of archaeological research and an analysis of theprocesses leading to the discovery of the Neolithic sites and thereby theformation of the current archaeological site distribution in theselandscapes is presented. The intensity of land use in the study area iscompared with other landscapes in southern Germany using site frequencies.Phases of colluvial deposition are dated using AMS 14C ages ofcharcoals and luminescence ages of sediments and interpreted as localproxies for a human presence. Archaeological source criticism indicates thatthe distribution of the Neolithic sites is probably distorted by factorssuch as superimposition due to erosion and weathering effects limiting thepreservation conditions for Neolithic pottery. A reconstruction of Neolithicsettlement dynamics is achieved by complementing the archaeological datawith phases of colluviation. Evidence for a continuous land use in the Baar regionthroughout the Neolithic is provided and sporadic phases of land use on theSwabian Jura and in the Black Forest are identified. In the late and finalNeolithic, an intensification of colluvial formation can be noticed in thelow mountain ranges.
摘要本研究将考古数据与来自崩塌沉积物的考古学数据相结合,以推断巴尔地区、黑森林和斯瓦本汝拉之间的新石器时代定居动态。本文回顾了考古研究的现状,并分析了新石器时代遗址的发现过程,从而在这些景观中形成了当前的考古遗址分布。研究区域的土地利用强度使用场地频率与德国南部其他景观进行比较。利用碳的AMS 14C年龄和沉积物的发光年龄来确定崩塌沉积的阶段,并将其解释为人类存在的局部代用物。考古来源的批评表明,新石器时代遗址的分布可能受到诸如侵蚀和风化作用导致的叠加等因素的扭曲,这些因素限制了新石器时代陶器的保存条件。重建新石器时代的沉降动力学是通过补充沉积阶段的考古数据来实现的。研究提供了巴尔地区在整个新石器时代持续使用土地的证据,并确定了斯瓦本汝拉和黑森林的零星土地使用阶段。在新石器时代晚期和晚期,在低山脉地区可以注意到崩塌形成的加剧。
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引用次数: 11
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E&amp;G Quaternary Science Journal
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