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Dates from drowned mid-Holocene landscapes on the central western Irish seaboard 来自爱尔兰中西部海岸的全新世中期淹没景观
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.1353/ijes.2019.0011
D. Williams, Eamon Doyle
Abstract:The Holocene in Ireland was a time of rapidly rising sea level that continued up to about 5000 years ago. This transgression lead to the flooding of mid-Holocene forested landscapes along the western seaboard of the country. Carbon 14 dating of in situ tree stumps set in peat from these forests shows a span of dates from approximately 7400 to 5200 years cal. BP from counties Mayo, Galway and Clare. Peat deposits of up to 2m thickness formed during this time. These dates firstly show that these forests were long-lived features of the Irish landscape. Secondly their presence suggests that at this time sea level was probably lower than that suggested in glacial rebound models for the area. Thirdly the general absence in these peats of evidence of marine incursion confirms that the Holocene highstand did not occur along the central part of the western Irish seaboard, unlike in areas along the north and east coasts of the country.
摘要:爱尔兰全新世是一个海平面快速上升的时期,一直持续到约5000年前。这种海侵导致了该国西海岸全新世中期森林景观的洪水泛滥。对这些森林中泥炭中的树桩进行的碳14测年显示,梅奥郡、戈尔韦郡和克莱尔郡的树桩的年代跨度约为距今7400年至5200年。在此期间形成了厚达2米的泥炭矿床。这些日期首先表明,这些森林是爱尔兰景观的长期特征。其次,它们的存在表明,当时海平面可能低于该地区冰川反弹模型所显示的海平面。第三,这些泥炭地普遍缺乏海洋入侵的证据,这证实了全新世高地并没有发生在爱尔兰西部海岸的中部地区,不像该国北部和东部海岸地区。
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引用次数: 0
Morphology and sedimentology of the Rooskagh Esker, Co. Roscommon 罗斯康姆地区的形态与沉积学
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/IRISJEARTSCIE.2019.05
C. Delaney
Abstract:Morphological and sedimentological investigations of the Rooskagh Esker, Co. Roscommon, indicate that there is a link between esker morphology and depositional environment. Sharp-crested ridges are underlain by glaciofluvial sediments laid down in subglacial tunnels and unroofed channels. Flat-topped segments are deltas, while fan-shaped areas are underlain by subaqueous outwash fans. Variation in morphology indicates that the esker is formed from repeated tunnel-to-ice-margin sections and is time-transgressive, indicating that the ice-marginal zone was characterised by stagnation zone retreat northward. The ice margin terminated in a proglacial lake.
摘要Roscommon地区Rooskagh Esker, Co.的形态和沉积学研究表明,Esker的形态与沉积环境之间存在联系。在冰下隧道和无顶河道中沉积的冰川河流沉积物下,有尖锐的峰顶山脊。平顶的部分是三角洲,而扇形的区域是水下的冲积扇。形态上的变化表明,该凹陷是由重复的隧道-冰缘剖面形成的,具有时间海侵性,表明冰缘带具有向北退缩的滞止带特征。冰缘的尽头是一个前冰期湖泊。
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引用次数: 9
The development of a sea-level database for Ireland 爱尔兰海平面数据库的开发
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.1353/ijes.2019.0009
A. Brooks, R. Edwards
Abstract:Despite a corpus of qualitative relative sea-level (RSL) data from Ireland, there exists a comparative paucity of precise and reliable information concerning changes since the Last Glacial Maximum (LGM). Much of the existing data are disparate in nature, having been produced by a range of studies employing different methodologies and often not specifically concerned with sea-level reconstruction. Consequently, there are large spatial and temporal gaps in our understanding of RSL changes, whilst other data are ambiguous and prone to misinterpretation. This paper presents a new database of sea-level information extracted from existing publications. Data are screened and classified into one of four groups according to their utility as indicators of RSL change. This objective classification, based upon well-established sea-level methodology, permits researchers to readily identify the most reliable trends in the available information, and helps to discriminate potentially erroneous data. The database is freely available on-line and should prove a valuable resource to researchers working in coastal environments around Ireland. It will be updated as new information becomes available, ensuring maximum value is extracted from the collection of new sea-level data and highlighting areas where more work is urgently needed.
摘要:尽管有来自爱尔兰的定性相对海平面(RSL)数据,但关于上一次冰川盛期(LGM)以来的变化,相对缺乏准确可靠的信息。现有的许多数据性质不同,是由一系列采用不同方法的研究产生的,通常与海平面重建无关。因此,我们对RSL变化的理解存在很大的空间和时间差距,而其他数据则模糊不清,容易被误解。本文介绍了一个从现有出版物中提取的海平面信息的新数据库。数据被筛选并根据其作为RSL变化指标的效用分为四组之一。这种基于公认的海平面方法的客观分类使研究人员能够容易地识别现有信息中最可靠的趋势,并有助于区分潜在的错误数据。该数据库可以在网上免费获得,对在爱尔兰沿海环境中工作的研究人员来说应该是一个宝贵的资源。它将随着新信息的提供而更新,确保从收集的新海平面数据中提取最大价值,并突出显示迫切需要更多工作的领域。
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引用次数: 0
Irish Pleistocene biostratigraphy 爱尔兰更新世生物地层学
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/irisjeartscie.2019.02
P. Coxon
Abstract:An appraisal of published and unpublished Pleistocene biostratigraphical information allows a critical update of the framework of the Irish Quaternary to be presented in the form of a table. Details are presented of Early and Middle Pleistocene temperate stages, as well as new information on a possible last interglacial (Eemian) site in Wexford. The Irish sequence is compared with that of neighbouring continental Europe and with the global record of marine oxygen isotope stages. The Gortian Interglacial is reviewed, and the known sites are listed together with their biostratigraphical ranges. The biostratigraphy of the Midlandian Glaciation, about which we now have far more information, is also discussed along with details, including a pollen diagram, of the recently dated Early Midlandian deposits between Spa and Fenit at Kilfenora, County Kerry.
摘要:对已发表和未发表的更新世生物地层学信息进行评估,可以以表格的形式对爱尔兰第四纪的框架进行关键更新。提供了早更新世和中更新世温带阶段的详细信息,以及韦克斯福德可能的最后一次间冰期(Eemian)遗址的新信息。爱尔兰序列与邻近的欧洲大陆序列以及全球海洋氧同位素阶段记录进行了比较。对戈尔特期冰间带进行了评述,并列出了已知的地点及其生物地层学范围。我们现在有了更多的信息,还讨论了米德兰冰川的生物地层学,以及克里郡Kilfenora Spa和Fenit之间最近测年的早米德兰矿床的细节,包括花粉图。
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引用次数: 4
Ice readvance from the southern Sperrin Mountains during the last deglaciation 最后一次消冰期,斯珀林山脉南部的冰推进
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/irisjeartscie.2019.01
J. Knight
Abstract:Sedimentary exposures near Mullaghcarn in the southern Sperrin Mountains, north-central Ireland, overlie planated bedrock platforms and comprise interbedded sequences of bedrock-derived diamictic breccias, rock rafts and glaciotectonic shears. At Murrinmaguiggan, bedrock rafts are located between glacial outwash sediments that were deposited alternately from Sperrin ice to the north and Omagh Basin ice to the south-west. Flow indicators, including erratic carriage and the dip direction of rock rafts, glaciotectonic shears and outwash sediments, show that Sperrin ice advanced from north to south into terrain that had been vacated by Omagh Basin ice, which then readvanced following Sperrin ice retreat. This geomorphic and sedimentary evidence suggests that Sperrin ice was active during early deglacial stages and that oscillations of its ice margin were not synchronous with oscillations of Omagh Basin ice. Changes in climate and ice mass balance may have controlled ice mass activity.
摘要/ Abstract摘要:爱尔兰中北部Sperrin山脉南部Mullaghcarn附近的沉积暴露物覆盖在平坦的基岩台地上,由基岩衍生的双晶角砾岩、岩筏和冰川构造剪切相互层序组成。在Murrinmaguiggan,基岩筏位于冰川外冲沉积物之间,这些沉积物交替沉积于北部的Sperrin冰和西南部的Omagh盆地冰之间。包括岩石筏、冰川构造剪切和外溢沉积物的不稳定移动和倾斜方向在内的水流指标表明,Sperrin冰从北向南进入奥马盆地冰空出的地形,奥马盆地冰在Sperrin冰撤退后继续前进。这些地貌和沉积证据表明,Sperrin冰在去冰期早期是活跃的,其冰缘的振荡与Omagh盆地冰的振荡并不同步。气候和冰块平衡的变化可能控制了冰块的活动。
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引用次数: 2
Notes on an interglacial deposit in Ballykeerogemore Townland and an interstadial deposit in Battlestown Townland, both in County Wexford 关于Ballykeerogemore Townland的间冰期矿床和Battlestown Townland的间冰期矿床的说明,两者都位于韦克斯福德郡
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/irisjeartscie.2019.03
G. Mitchell, W. Watts
Abstract:Ballykeerogemore: 6km south of New Ross, interglacial muds and silts (probably of Gortian age) were disturbed by ice (probably of Munsterian age) which thrust diamicts into them. The disturbed deposits were later partly buried by outwash (glaciofluvial) sands and gravels. Still later there was extensive development of ground-ice in the area, and many arcuate banks formed when the ground-ice melted.Battlestown: 3.5km south-east of Ramsgrange, there is a small enclosed basin in which weakly calcareous diamict (probably of Munsterian age) rests on rock. In the centre of the basin a thin layer of grey, laminated, pyritic, fine-grained material with a low content of organic debris with arctic affinities rests on the diamict. A feeble interstadial is suggested. The debris thins out upwards in a grey sandy clay-mud. Near the surface the material gains a content of small stones, possibly carried in by periglacial activity.
摘要/ Abstract摘要:Ballykeerogemore:在New Ross以南6km处,间冰期淤泥和粉砂(可能是Gortian时代的)被冰(可能是Munsterian时代的)挤压而成。受扰动的沉积物后来部分被冲积砂和砾石掩埋。再晚些时候,该地区的地冰得到了广泛的发展,当地冰融化时,形成了许多弧形的河岸。Battlestown:在Ramsgrange东南3.5公里处,有一个小的封闭盆地,岩石上有弱钙质沉积物(可能是Munsterian时代的)。在盆地的中心,有一层薄薄的灰色层状黄铁矿细粒物质,其有机碎屑含量低,与北极有亲缘关系。提出了一个微弱的间隔期。碎片在灰色的沙质粘土中逐渐变薄。靠近地表的物质中含有小石块,可能是冰周活动带进来的。
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引用次数: 0
Midlandian cold stage deposits at Loop Head, Southern County Clare 克莱尔郡南部Loop Head的米德兰冷期矿床
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/IRISJEARTSCIE.2019.07
A. E. Richards, M. Waller, O. Bloetjes
Abstract:This paper discusses the nature of two suites of glacigenic sediments exposed at Bridges of Ross, southern County Clare. A lower diamicton suite is thought to have been derived from an ice sheet moving from the north-east and contains a previously unrecorded, organic, stadial deposit. The overlying limestone-rich glacigenic sediments appear to be derived from a later stage of glaciation, emanating from the east. A formal lithostratigraphic scheme is presented that includes two new formations, the Loop Head and Lehinch formations, both of which are likely to be of Midlandian age.
摘要:本文讨论了克莱尔郡南部罗斯桥暴露的两套冰川沉积物的性质。一个较低的迪亚米顿岩套被认为来自从东北方向移动的冰盖,其中包含一个以前没有记录的有机体育场沉积物。上覆富含石灰岩的冰川沉积物似乎来源于冰川作用的后期,从东部发源。提出了一个正式的岩石地层方案,其中包括两个新的地层,Loop Head和Lehinch地层,这两个地层都可能是米德兰时代的。
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引用次数: 0
The geology of the Kilbride Peninsula and adjacent areas, County Mayo, and its gignificance for regional geological models 梅奥郡基尔布赖德半岛及其邻近地区的地质,及其对区域地质模型的重要性
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/ijes.2021.39.3
J. R. Graham, M. Badley
Abstract:A new geological map and a partly revised lithostratigraphy are presented for the Kilbride Peninsula and the area immediately to the north in County Mayo in the west of Ireland. Volcanic arc rocks of the Lough Nafooey Group are unconformably overlain by late Floian mudrocks that were deposited after the cessation of volcanic activity and which did not receive any detritus from the Lough Nafooey arc. The unconformably overlying Darriwillian Rosroe Formation is similar in character to areas immediately to the west and north-east and shows a coarsening upward pattern. A south dipping Silurian succession everywhere masks the contact between the Lough Nafooey Group and the metamorphic rocks of Connemara. The Silurian succession shows progressive deepening from terrestrial sediments at the base to deep-water turbidites in the youngest strata seen. There are also important provenance changes throughout the Silurian succession. A widespread alkaline lava near the base is the only thick volcanic horizon seen in the succession. The structural geometry suggests that two large fault features (the Doon Rock and Clonbur faults) acted as a linked system during sedimentation and may have produced a point source for a clastic sediment fan of latest Ordovician or early Silurian age. This feature, termed the Derryveeny fan, contains coarse-grained metamorphic detritus from erosion of Connemara further to the south. A marked strike swing of the Silurian strata is attributed to post-Wenlock SSE directed contraction with reverse reactivation of the Derry Bay and Lettereeneen faults and associated deformation of their respective footwalls.This is an open access article under the terms of the Creative Commons attribution license, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Open Access funding provided by IReL.
摘要:本文绘制了爱尔兰西部梅奥郡基尔布赖德半岛及其北部地区的新地质图和部分修订的岩石地层。纳福伊湖群的火山岩不整合上覆有晚弗洛世泥岩,这些泥岩是火山活动停止后沉积的,没有接受纳福伊湖弧的碎屑。不整合上覆的darriwilliam Rosroe组与紧靠其西部和东北部的地区在性质上相似,呈粗化向上模式。南倾的志留纪演替无处不在,掩盖了纳福伊湖群与康涅马拉变质岩之间的接触。志留纪的演替表明,在最年轻的地层中,从底部的陆相沉积物到深水浊积岩逐渐加深。在整个志留纪演替过程中,物源也发生了重要的变化。底部附近广泛分布的碱性熔岩是该序列中唯一看到的厚火山层。构造几何特征表明,在沉积过程中,两个大的断层特征(Doon岩和Clonbur断层)是一个连接的系统,可能为奥陶世晚期或志留纪早期的碎屑沉积扇产生了一个点源。这个被称为Derryveeny扇的特征,包含了从更南边的Connemara侵蚀而来的粗粒变质碎屑。志留系地层的明显走向摇摆归因于后温洛克时期的SSE定向收缩、德里湾断裂和莱特林恩断裂的逆活化及其相应的下盘变形。这是一篇基于知识共享署名许可的开放获取文章,该许可允许在任何媒体上使用、分发和复制,前提是正确引用原始作品。由IReL提供的开放获取资金。
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引用次数: 0
The last glaciation of Aran Island and Cruit Island, Co. Donegal, north-west Ireland 爱尔兰西北部多尼戈尔郡阿兰岛和克鲁特岛的最后一次冰川作用
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.1353/ijes.2019.0005
J. Knight
Abstract:This paper describes geomorphological and sedimentary evidence from Aran Island and Cruit Island (County Donegal, north-west Ireland), informed by evidence from across west Donegal, which helps to show the processes of ice advance and retreat and subglacial conditions during the last (late Midlandian) glaciation. Extensive abraded rock surfaces show clear evidence for ice overtopping of the islands. Erosional landforms include striae, flutes developed in bedrock, whalebacks, roches mountonnées and meltwater channels. Depositional landforms include erratic boulders and a single marginal moraine on Aran Island. Glacial or glacially-influenced sediment deposition that does not have a geomorphic expression took place into bedrock hollows during an ice advance stage, probably around the time of the last glacial maximum. The dominance of erosional signatures likely reflects the stripping by ice of a surficial cover of weathered pre-glacial granite debris. The general absence of subglacial and ice-marginal sediments across the region likely reflects the granite substrate and coarse granitic weathering products, which did not favour development of a thick deformable sediment pile.
摘要:本文描述了阿兰岛和克鲁特岛(爱尔兰西北部多尼戈尔郡)的地貌和沉积证据,并从多尼戈尔西部的证据中获得信息,这有助于显示上一次(晚米德兰纪)冰川作用期间冰的进退过程和冰下条件。大量磨损的岩石表面显示出明显的证据,表明这些岛屿上有冰漫顶。侵蚀地貌包括条纹、基岩中发育的凹槽、鲸鱼背、罗什山脉和融水通道。阿兰岛上的沉积地貌包括飘忽不定的巨石和单一的边缘冰碛。在冰川推进阶段,可能在最后一次冰川盛期前后,没有地貌表现的冰川或冰川影响的沉积物沉积在基岩凹陷中。侵蚀特征的主导作用可能反映了冰川前风化花岗岩碎屑的表层被冰剥离。该地区普遍缺乏冰下和冰缘沉积物,这可能反映了花岗岩基底和粗糙的花岗岩风化产物,这不利于厚的可变形沉积物堆的形成。
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引用次数: 0
A special compilation of papers on the Quaternary of Ireland published in Irish Journal of Earth Sciences 在爱尔兰地球科学杂志上发表的关于爱尔兰第四纪的特别论文汇编
Q4 Earth and Planetary Sciences Pub Date : 2022-01-07 DOI: 10.3318/IRISJEARTSCIE.2019.00
P. W. Jackson, M. Parkes, J. Murray
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引用次数: 0
期刊
Irish Journal of Earth Sciences
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