Proceedings of the Geologists Association最新文献_第4页

Post-glacial development of limestone scree in NW England; the example of White Scar, southern English Lake District 英格兰西北部石灰岩碎石的冰期后发育以英国南部湖区的White Scar为例

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-03-01 Epub Date: 2026-02-19 DOI: 10.1016/j.pgeola.2026.101165

Paul A. Carling , Richard B. Pearce , S.E. Darby

{"title":"Post-glacial development of limestone scree in NW England; the example of White Scar, southern English Lake District","authors":"Paul A. Carling , Richard B. Pearce , S.E. Darby","doi":"10.1016/j.pgeola.2026.101165","DOIUrl":"10.1016/j.pgeola.2026.101165","url":null,"abstract":"<div><div>Depositional facies of accumulated rock-debris below a limestone cliff, in the English Lake District, hold clues to environment change since deglaciation. Glacifluvial talus is a deglacial accumulation of compact sub-rounded glacifluvial cobbles and boulders, with an admixture of angular cliff-fall boulders. Scree is a less-compact, openwork, likely Younger Dryas, accumulation of angular cliff-fall rock fragments that overlies the talus. Both facies were subject to precipitation of calcite cement along preferential drainage lines. Scanning electron microscopy showed that the talus is weakly micrite-cemented, averring for largely phreatic, formerly higher, groundwater conditions at the cliff base, whilst hard, sparry-cement within the scree indicates vadose drainage behind the scree down the cliff face.</div><div>The cement primarily is calcite (<97.9%) and dolomite (<1.5%) with an important but highly variable admixture of quartz (<30%); the latter derived, in part, from glacial-transported lithologies but primarily from windblown material. The latter is locally-abundant, occurring as an uncalcified sandy-matrix within the scree due to infiltration deposition of locally-sourced coversand and loess. Oxygen isotope (δ<sup>18</sup>O) values indicate that calcite cementation is due to input of meteoric waters at July air temperatures of between 8.3 and 15.5 °C, whilst carbon isotope (δ<sup>13</sup>C) values indicate a low presence of organic material. The isotopes conjointly indicate a warming climate (probably following the Younger Dryas) where microbial respiration, rather than strong terrestrial carbon inputs, mediated cementation. There are no stratigraphical indicators within the scree to indicate any variation in the climatic drivers of the weathering process that followed deglaciation until today.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 2","pages":"Article 101165"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147553912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geosites representing the geological environment of Forest Adygeya (western Greater Caucasus, southwestern Russia) 代表Adygeya森林（俄罗斯西南部大高加索西部）地质环境的地质遗址

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-03-01 Epub Date: 2026-02-26 DOI: 10.1016/j.pgeola.2026.101176

Dmitry A. Ruban

{"title":"Geosites representing the geological environment of Forest Adygeya (western Greater Caucasus, southwestern Russia)","authors":"Dmitry A. Ruban","doi":"10.1016/j.pgeola.2026.101176","DOIUrl":"10.1016/j.pgeola.2026.101176","url":null,"abstract":"<div><div>The awareness of geoheritage representing geological environments in internationally poorly known domains needs to be increased. Forest Adygeya is an area of the western Greater Caucasus dominated by Upper Cretaceous–Cenozoic deposits, geological activity of rivers, and cuestas. Field investigations coupled with a re-evaluation of the published information permitted proposing and characterising three geosites, several candidate geosites, and a scenic road in this area. The chosen localities were described by seventeen criteria such as geological content, geoheritage types, physical view, geometry, accessibility, and protection status. The proposed geosites are the Tulskaya Gorge (a spectacular gorge with a stratotype section of mid-Miocene formations and outcrops of stromatolitic carbonates), the Hanging Rock (a cliff exposing mid-Miocene siliciclastics), and the Maykopka Waterfall (a scenic waterfall with natural outcrops of mid-Miocene deposits). Seven candidate geosites represent various characteristic geological and geomorphological features of Forest Adygeya, but the knowledge of them is yet to be detailed. The Sevastopolskaya–Novosvobodnaya scenic road in the southeastern plot offers panoramic views of a strongly denudated cuesta. The proposed geoheritage features need official status and monitoring, and they can be exploited for the purposes of (geo)tourism. Geoheritage management in the study area can be connected to the development of the growing thermal resort.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 2","pages":"Article 101176"},"PeriodicalIF":1.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147553909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Khondalite: A geological gem and heritage stone of Odisha - India's architectural legacy 孔达利石：地质宝石和奥里萨邦的遗产石-印度的建筑遗产

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2026-02-03 DOI: 10.1016/j.pgeola.2026.101161

Ranjit Nayak

{"title":"Khondalite: A geological gem and heritage stone of Odisha - India's architectural legacy","authors":"Ranjit Nayak","doi":"10.1016/j.pgeola.2026.101161","DOIUrl":"10.1016/j.pgeola.2026.101161","url":null,"abstract":"<div><div>The metamorphic rock khondalite, which is mostly found in India's Eastern Ghats, has been essential to the region's architectural heritage. The fact that khondalite was extensively utilized in the building of the most well-known and recognizable temples and monuments, such as the Puri Jagannath Temple, the Konark Sun Temple, and the Lingaraj Temple, is evidence of its strength and beauty. The occurrence, geological characteristics, and applications of khondalite in Odisha's temple and heritage architecture highlight its abundance in the Eastern Ghats, a durable building stone that shaped the aesthetic and structural identity of monuments like the Lingaraj Temple, Jagannath Temple, Konark Sun Temple <em>etc.</em>, across the region. This study examines the use of Khondalite as a building stone throughout history and in the present, emphasizing its value as a resource for Indian heritage stones. This research project will aim to emphasize the social and architectural significance of Khondalite in Odisha, promoting its conservation and promotion as a heritage stone resource through an extensive examination of historical and architectural records as well as field observations. In the 12th century, King Anantavarman Chodaganga Deva built the Lord Jagannath Temple out of Khondalite rock, which is famous for its yearly Rath Yatra (Chariot Festival). Using Khondalite rock Konark Sun Temple was constructed, which is now a UNESCO World Heritage Site. Moreover, the Somavamsi dynasty sponsored the construction of the magnificent Khondalite Lingaraj Temple in Bhubaneswar, which features elaborate carvings and a unique devotion to both Lord Shiva and Vishnu. The architectural and cultural legacy of Odisha is emphasized by these shrines and monuments built by Khondalites.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 1","pages":"Article 101161"},"PeriodicalIF":1.3,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147406785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2026-01-31 DOI: 10.1016/j.pgeola.2026.101162

David A.G. Nowell

引用次数: 0

Correlation of the lower and middle Turonian chalks of south-west England and north-west France — condensation towards the Cornubian and Armorican massifs 英格兰西南部和法国西北部下、中Turonian白垩的对比——向Cornubian和armor美洲地块的凝结

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2026-02-05 DOI: 10.1016/j.pgeola.2026.101163

Andy Gale

引用次数: 0

Phytolith insights into palaeosol formation and climate dynamics in the Pliocene Karewa deposits, Kashmir Himalaya, India 印度克什米尔-喜马拉雅地区上新世Karewa沉积物中植物岩对古土壤形成和气候动力学的研究

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2025-10-31 DOI: 10.1016/j.pgeola.2025.101154

Suhail Hussain Sheikh , Malik Zubair Ahmad , Waseem Qader , Ishfaq Ul Rehman , Irfan Rashid , Showkat Hamid Mir , Jehangeer Ahmad Mir , Reyaz Ahmad Dar

{"title":"Phytolith insights into palaeosol formation and climate dynamics in the Pliocene Karewa deposits, Kashmir Himalaya, India","authors":"Suhail Hussain Sheikh , Malik Zubair Ahmad , Waseem Qader , Ishfaq Ul Rehman , Irfan Rashid , Showkat Hamid Mir , Jehangeer Ahmad Mir , Reyaz Ahmad Dar","doi":"10.1016/j.pgeola.2025.101154","DOIUrl":"10.1016/j.pgeola.2025.101154","url":null,"abstract":"<div><div>The phytolith study of sedimentary deposits serves as a valuable tool for reconstructing past vegetation and environmental changes. In this study, we carried out a phytolith analysis of a palaeosol and a clay bed from the Pliocene Lower Karewa deposits of the Kashmir Himalaya, India. The palaeosol lies directly over the hard rock basement. The material that forms the palaeosol is thought to represent sedimentation at the time of Kashmir Valley formation around 4 Ma owing to the uplift of the Pir Panjal Range. The phytolith assemblages suggest the area supported a complex vegetation structure during palaeosol formation and clay bed deposition. The phytolith assemblages, commonly associated with C<sub>4</sub> grasses — characteristic of warm, arid, and low CO<sub>2</sub> environments, and some woody plants and shrubs, suggest warmer and drier climatic conditions during palaeosol formation. However, micromorphological analysis and detailed field observations suggest that the material that forms the palaeosol was deposited much later than the commencement of valley formation. The co–occurrence of phytoliths of diverse climate and vegetation types along the depth of palaeosol indicates a thorough mixing of material during its deposition, possibly by pedogenic, glaciotectonic or mass–wasting processes. Our study provides a renewed viewpoint on the oxidized palaeosol, suggesting that previous interpretations about its formation during basin formation need reconsideration. On the other hand, the clay bed depicts less diverse phytolith assemblages, suggesting a possibly harsher, colder environment. The phytolith morphotypes of the clay bed depict a more controlled climate, and each lamina suggests the phytolith of a particular time period.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 1","pages":"Article 101154"},"PeriodicalIF":1.3,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147406787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconstructing the Caledonian orogeny in West Pontides: Tectono-magmatic signatures from the İstanbul–Zonguldak Tectonic Unit 重建西庞德斯加里东造山运动：来自İstanbul-Zonguldak构造单元的构造-岩浆特征

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2025-10-22 DOI: 10.1016/j.pgeola.2025.101153

Fatih Şen

{"title":"Reconstructing the Caledonian orogeny in West Pontides: Tectono-magmatic signatures from the İstanbul–Zonguldak Tectonic Unit","authors":"Fatih Şen","doi":"10.1016/j.pgeola.2025.101153","DOIUrl":"10.1016/j.pgeola.2025.101153","url":null,"abstract":"<div><div>New U–Pb zircon geochronology and geochemical data from slightly folded gabbro dykes intruding pre-Devonian strata in the İstanbul Terrane (İstanbul–Zonguldak Tectonic Unit, NW Turkey) constrain a Silurian magmatic episode (434.3 ± 4.0 Ma and 428.5 ± 2.2 Ma) associated with syn-collisional alkaline magmatism. Despite within-plate trace element signatures (notably positive Nb anomalies), tectonic discrimination diagrams indicate emplacement within a syn-collisional regime, consistent with slab break-off following soft docking between Far East Avalonia and Baltica. High-intensity zircon overgrowths yield concordant Early Devonian ages (<em>c.</em>416–415 Ma), interpreted as a distal Caledonian tectono-thermal overprint. The Th/U ratios and cathodoluminescence textures of these domains support deformation-related recrystallisation rather than magmatic or metamorphic zircon growth. Structurally, folded geometries and axial-plane cleavage in the dykes are consistent with this event. These data imply that the İstanbul Terrane records a previously unrecognised disconformity at the Silurian–Devonian boundary, correlating with the established unconformity in the Zonguldak Terrane. This stratigraphical gap, masked by urbanisation in the İstanbul region, aligns with regional deformations of the Caledonian orogeny across Avalonian fragments.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"137 1","pages":"Article 101153"},"PeriodicalIF":1.3,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147406786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The historiography of dinosaur footprints of the Lower Cretaceous Wealden Group on the Isle of Wight, UK 英国怀特岛下白垩纪威尔登群恐龙脚印的史学研究

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2026-02-01 Epub Date: 2026-02-06 DOI: 10.1016/j.pgeola.2026.101164

Megan L. Jacobs

引用次数: 0

Liquefaction geo-hazard in the Fethiye Basin at the edge of Hellenic Trench 希腊海沟边缘费特希耶盆地液化地质灾害

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-12-01 Epub Date: 2025-09-26 DOI: 10.1016/j.pgeola.2025.101148

Orkun Türe, Serhat Tuna Çelikkollu

{"title":"Liquefaction geo-hazard in the Fethiye Basin at the edge of Hellenic Trench","authors":"Orkun Türe, Serhat Tuna Çelikkollu","doi":"10.1016/j.pgeola.2025.101148","DOIUrl":"10.1016/j.pgeola.2025.101148","url":null,"abstract":"<div><div>Structures are typically built on solid-state soils, assuming they will support the loads. However, if these soils are loose and saturated, their strength decreases during earthquakes. If this critical process is not considered during the structural design, the consequences can be catastrophic. Consequently, determination of liquefiable and non-liquefiable soils and mapping their spatial distribution over an area have always been significant tasks in urbanisation especially in regions with high population density. Fethiye Basin, which is located at the edge of the Hellenic Trench, is such a high-density tourist destination with its population exceeding one million during summers. The region is known to be struck by a Ms = 7.1 earthquake in 1957 which resulted in the collapse of almost all of the buildings within the area. Moreover, latest research indicates that the region may be struck by a high magnitude earthquake in the following years and such event will be a significant threat for the residents and the visitors. Accordingly, a liquefaction hazard map of the Fethiye Basin was developed based on Liquefaction Potential Index (LPI) values. The western coastal part of the basin, where population density is high and groundwater is shallow, exhibits high liquefaction susceptibility. In contrast, the eastern part is relatively safe due to deeper groundwater levels.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 6","pages":"Article 101148"},"PeriodicalIF":1.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145719056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Re-assessment of a large archosaur dentary from the Late Triassic of South Wales, United Kingdom 对英国南威尔士晚三叠世一种大型齿状祖龙的重新评估

IF 1.3 4区地球科学

Proceedings of the Geologists Association Pub Date : 2025-12-01 Epub Date: 2025-09-11 DOI: 10.1016/j.pgeola.2025.101142

Owain Evans , Cindy Howells , Nathan Wintle , Michael J. Benton

{"title":"Re-assessment of a large archosaur dentary from the Late Triassic of South Wales, United Kingdom","authors":"Owain Evans , Cindy Howells , Nathan Wintle , Michael J. Benton","doi":"10.1016/j.pgeola.2025.101142","DOIUrl":"10.1016/j.pgeola.2025.101142","url":null,"abstract":"<div><div>A large jaw of a predatory archosaur from the latest Triassic of South Wales, named <em>Zanclodon cambrensis</em>, has long intrigued vertebrate palaeontologists. Could it be the oldest large theropod dinosaur? Here we reanalyse the specimen based on a new 3D digital reconstruction. We confirm first that it is indeed latest Triassic in age, most likely extracted from sandstones of the Cotham Member of the Lilstock Formation (Penarth Group, Rhaetian). Anatomically it shows features of theropod dinosaurs rather than other large non-dinosaurian predatory archosaurs of the Triassic. It shares general characteristics with European coelophysoids of similar age such as <em>Liliensternus</em> and <em>Dracoraptor</em> but is considerably larger. It is not a megalosauroid, as suggested previously, but it is unclear whether it might be an averostran or tetanuran. Its close similarity to <em>Dilophosaurus</em> suggests that this left-hand mandible specimen represents a more derived basal neotheropod and we assign it to a new genus, as <em>Newtonsaurus cambrensis</em>.</div></div>","PeriodicalId":49672,"journal":{"name":"Proceedings of the Geologists Association","volume":"136 6","pages":"Article 101142"},"PeriodicalIF":1.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145718873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0