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Characterizing the sediment dynamics through in-situ measurements in the abyssal Manila Trench, northeast South China Sea 通过对南海东北部深海马尼拉海沟的原位测量确定沉积物动力学特征
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-08-08 DOI: 10.1016/j.margeo.2024.107372
Meng Liu , Yunpeng Lin , Fukang Qi , Jingping Xu
{"title":"Characterizing the sediment dynamics through in-situ measurements in the abyssal Manila Trench, northeast South China Sea","authors":"Meng Liu ,&nbsp;Yunpeng Lin ,&nbsp;Fukang Qi ,&nbsp;Jingping Xu","doi":"10.1016/j.margeo.2024.107372","DOIUrl":"10.1016/j.margeo.2024.107372","url":null,"abstract":"<div><p>Abyssal sedimentary dynamic processes are crucial to be understanding the transport and distribution of material (sediment, carbon, plastics, etc.) and the formation of deep-sea bedforms. Accurately characterizing such complicated processes requires a multi-faceted approaches (e.g. numercial models, physical experiments, field observation), among which in-situ field data gathering has been the most challenging. In this study, we collected data from four bottom moorings deployed along the Manila Trench in the northeast South China Sea to investigate the sediment transport processes at the trench bottom. The events with high turbidity, including strong and fast gravity flow and weaker turbidity currents with speed similar to tidal currents, transport sediment down-trench. Sediment particles in the northern part of the trench were generally found to move northward (i.e. up the trench) with seasonal variations primarily influenced by the asymmetrical subtidal currents. During the intensification of northbound subtidal current, the benthic nepheloid layers in Gaoping Canyon, which feeds into the trench, might be transported to the north of trench. Furthermore, a weaker turbidity oscillation at S2 tidal frequencies was observed before turbidity current occurred, increasing sediment transport to the deep. It was hypothesized that multiple small turbidity currents may have been triggered by an earthquake, despite not reaching the mooring S2, with the fine sediment being transported downstream by abyssal tidal currents.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"476 ","pages":"Article 107372"},"PeriodicalIF":2.6,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Holocene palaeoenvironmental development of Prokljan Lake (Krka River, Croatia): Evolution from a calcareous tufa barrier system to a karst estuary Prokljan 湖(克罗地亚克尔卡河)全新世古环境发展:从钙质页岩屏障系统到岩溶河口的演变
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-08-06 DOI: 10.1016/j.margeo.2024.107370
Natalia Smrkulj, Ozren Hasan, Dea Brunović, Slobodan Miko, Nikolina Ilijanić
{"title":"Holocene palaeoenvironmental development of Prokljan Lake (Krka River, Croatia): Evolution from a calcareous tufa barrier system to a karst estuary","authors":"Natalia Smrkulj,&nbsp;Ozren Hasan,&nbsp;Dea Brunović,&nbsp;Slobodan Miko,&nbsp;Nikolina Ilijanić","doi":"10.1016/j.margeo.2024.107370","DOIUrl":"10.1016/j.margeo.2024.107370","url":null,"abstract":"<div><p>The upstream part of the karst estuary of the Krka River (Prokljan Lake) on the Eastern Adriatic Coast was studied by combining high-resolution seismic data, analyses on sediment cores, and radiocarbon dating to reconstruct the late Quaternary stratigraphy of the estuary. The sedimentary infill consists of up to 20 m of freshwater and estuarine deposits divided into four seismostratigraphic units corresponding to several stages of development since the last glacial period. The lowstand stage is assumed to correspond to fluvial incision and sediment bypass associated with glacial periods. The postglacial transgressive stage is marked by the growth of calcareous tufa barriers and fluvio-lacustrine deposition. The onset of marine influence in the estuary (Prokljan Lake) was recorded at the beginning of the Holocene (&gt;10,500 cal y BP) with the deposition of brackish sediments with a strong freshwater influence. Calcareous tufa barriers prevented direct rapid flooding of Prokljan Lake in the period from &gt;10,500 cal y to ∼7200 cal y BP. Finally, the transgressive brackish deposition changed to estuarine/marine highstand deposition in a salt-wedge estuary during the late Holocene (∼4000–3000 cal y BP). The late Quaternary deposition in this unique karst setting showed dramatic changes. It was primarily influenced by rapid sea-level rise, climate changes, estuarine geomorphology and relatively low sediment supply.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"476 ","pages":"Article 107370"},"PeriodicalIF":2.6,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141944201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Nonnegligible contribution of terrigenous sediment inputs from local small watersheds to west regions of the Pearl River Estuary, northern South China Sea shelf 南海北部陆架珠江口西部地区局部小流域的陆源沉积物输入的不可忽略贡献
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-08-02 DOI: 10.1016/j.margeo.2024.107369
Chenjian He , Tingping Ouyang , Mingkun Li , Shanying Zhu , Mingjie Yu , Shasha Peng , Zhaoyu Zhu , Yunpeng Wang , Hongjun Chen , Chengjing Tian
{"title":"Nonnegligible contribution of terrigenous sediment inputs from local small watersheds to west regions of the Pearl River Estuary, northern South China Sea shelf","authors":"Chenjian He ,&nbsp;Tingping Ouyang ,&nbsp;Mingkun Li ,&nbsp;Shanying Zhu ,&nbsp;Mingjie Yu ,&nbsp;Shasha Peng ,&nbsp;Zhaoyu Zhu ,&nbsp;Yunpeng Wang ,&nbsp;Hongjun Chen ,&nbsp;Chengjing Tian","doi":"10.1016/j.margeo.2024.107369","DOIUrl":"10.1016/j.margeo.2024.107369","url":null,"abstract":"<div><p>As a crucial “sink” for terrigenous material entering the ocean, provenance of sediments within the coastal zone and continental shelf sea regions holds significant scientific importance in the investigation of global material cycling. Environmental magnetism was proved as an effective and rapid approach for sediment source identification. Detail and systematic magnetic measurements were performed for surface sediment samples collected from the mega Pearl River, local small rivers (Tan, Moyang and Jian rivers) of west Guangdong, coastal zone (CZ) and continental shelf (CS) to analyze the contribution of local small watersheds to marine sediments. The results indicate that detrital river input magnetite and hematite are coexisted in both CZ and CS sediments. Compared to CZ sediments, relatively higher concentration of hematite and finer grain size of magnetite are appeared at CS sediments. By comparing of magnetic parameters, it was inferred that magnetic minerals from the Pearl and Tan rivers are transported and deposited on the coastal zone by Guangdong longshore current. Meanwhile, sediment magnetic parameters in the Moyang and Jian Rivers are similar to the CS sediments, implying the two rivers-sourced materials were directly transported and deposited at the CS due to their narrow and restricted estuaries, and/or the CS preserves the residual deposits from the two rivers formed during the Last Glacial. Except for the Pearl River, sources of local small rivers significantly contribute to marine sediments at the coastal zone and continental shelf.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107369"},"PeriodicalIF":2.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025322724001531/pdfft?md5=017d409748fc64c8814f47132bed8a3b&pid=1-s2.0-S0025322724001531-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141944202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Provenance shift of the abyssal plains in the Southwest sub-basin of the South China Sea at ∼ 8 Ma: Tectonics & climate changes implication 南海西南次盆地深海平原在 ∼ 8 Ma 的成因转变:构造和气候变化的影响
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-31 DOI: 10.1016/j.margeo.2024.107368
Yi Yan , Lan Liu , Peter D. Clift , Yildirim Dilek , Anbei He
{"title":"Provenance shift of the abyssal plains in the Southwest sub-basin of the South China Sea at ∼ 8 Ma: Tectonics & climate changes implication","authors":"Yi Yan ,&nbsp;Lan Liu ,&nbsp;Peter D. Clift ,&nbsp;Yildirim Dilek ,&nbsp;Anbei He","doi":"10.1016/j.margeo.2024.107368","DOIUrl":"10.1016/j.margeo.2024.107368","url":null,"abstract":"<div><p>Tectonic processes and climatic changes are recognized as two major drivers of erosion along the southeastern margin of the Tibetan Plateau and consequently are the main factors controlling depositional patterns along the margins of the South China Sea. However, the role of tectonics and climate in governing the types and patterns of sedimentation in the abyssal plains is relatively little known. The results of International Ocean Discovery Program (IODP) drilling in the abyssal plains of the Southwest sub-basin of the South China Sea show that the multi-trace element and rare earth element (REE) character of sediments older than ∼8 Ma are in disorder. εNd(0) and <sup>87</sup>Sr/<sup>86</sup>Sr values exhibit large fluctuations, which implies temporally variable sediment sources during the early post-spreading stage of the South China Sea. High εNd(0) and low <sup>87</sup>Sr/<sup>86</sup>Sr values and abundant Cenozoic (13–35 Ma) zircon grains in the sediments suggest relatively juvenile sources for their origins, such as the Cagayan Ridge and Palawan Block in the south before ∼8 Ma. Multi-trace element and REE patterns of sediments younger than ∼8 Ma are more uniform. Low εNd(0) and high <sup>87</sup>Sr/<sup>86</sup>Sr values of the sediments indicate that more continentally-derived sediments were transported to the abyssal plain. Coastal rivers in SE Vietnam, and the Mekong and Red Rivers in the west gradually became the major detrital sources of abyssal sediments in the Southwest sub-basin after ∼8 Ma. The switching of the sediment sources from the south to the west is consistent with the progressive uplift of the Vietnamese Central Highlands (VCH) and the SE Tibetan Plateau margin during the Late Miocene. The strengthened summer monsoon since ∼5 Ma affected not only the marginal basins, but also the deep abyssal basins. We argue that the regional tectonics shaped and controlled the shift of provenance and sediment routing system, whereas the East Asian monsoon affected the sediment flux to the abyssal plains of the Southwest sub-basin in the South China Sea.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107368"},"PeriodicalIF":2.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141944203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Formation of Deflation Ridges 通货紧缩脊的形成
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-26 DOI: 10.1016/j.margeo.2024.107367
Patrick A. Hesp
{"title":"The Formation of Deflation Ridges","authors":"Patrick A. Hesp","doi":"10.1016/j.margeo.2024.107367","DOIUrl":"10.1016/j.margeo.2024.107367","url":null,"abstract":"<div><p>The deposition of both pumice and shell is common on beaches during calm and storm wave conditions. This paper describes an investigation of pumice and shell ridges at two sites in Australia, Dark Point in NSW, and in the Younghusband Peninsula in SE South Australia. The formation of lines of wave formed shelly and pumice rich deposits on, and above the backshore is described. The deposits are buried by dune development, but then later exhumed by aeolian deflation as deflation plains and basins evolve. Aeolian erosion of the finer sandy sediments leads to the creation of a ridge form, herein termed a deflation ridge. A new schematic model of ridge formation is also detailed whereby deflation ridges are formed by the aeolian erosion and deflation of shell or pumice concentrations and lag deposits.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107367"},"PeriodicalIF":2.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025322724001518/pdfft?md5=b0ee298bdd6a7defca66fa2e4cec0b36&pid=1-s2.0-S0025322724001518-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141847792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stable carbon and oxygen isotope signatures of mantle-derived calcite in Aitutaki lherzolite xenolith: Implications for organic carbon cycle in the oceanic mantle 艾图塔基蛭石异长岩中地幔源方解石的稳定碳和氧同位素特征:对大洋地幔中有机碳循环的影响
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-26 DOI: 10.1016/j.margeo.2024.107363
Norikatsu Akizawa , Toyoho Ishimura , Masako Yoshikawa , Tetsu Kogiso , Akira Ishikawa , Kazuhide Mimura
{"title":"Stable carbon and oxygen isotope signatures of mantle-derived calcite in Aitutaki lherzolite xenolith: Implications for organic carbon cycle in the oceanic mantle","authors":"Norikatsu Akizawa ,&nbsp;Toyoho Ishimura ,&nbsp;Masako Yoshikawa ,&nbsp;Tetsu Kogiso ,&nbsp;Akira Ishikawa ,&nbsp;Kazuhide Mimura","doi":"10.1016/j.margeo.2024.107363","DOIUrl":"10.1016/j.margeo.2024.107363","url":null,"abstract":"<div><p>Carbon isotope data is desired to be increased to promote the understanding of carbon cycle throughout in the Earth. Diamond is a key carbonaceous tool to study deep carbon cycle, but most diamond occurrences are limited from kimberlite pipes in the continental region. Recently, micron-sized diamonds have been discovered from the oceanic region and investigated to understand deep carbon cycle in the oceanic mantle. However, some fundamental cautions have been issued on the oceanic diamonds because some of them could be of artificial origin. Hence, alternative oceanic mantle-derived carbonaceous material is needed to increase oceanic carbon isotope data. We report micron-sized calcite vein in a lherzolite xenolith hosted by enriched mantle I (EM1)-type olivine nephelinite from Aitutaki Island, Cook Islands in the southern Pacific. With employing various techniques to determine carbon and oxygen isotope compositions from sub-micrograms of calcite, we demonstrate that carbonaceous fluid originated from EM1-type mantle source exhibited organic carbon signature based on its light carbon isotope composition along with petrographic characteristics of the calcite vein. The oceanic mantle hosts organic carbon in places due to the recycling of surface materials.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107363"},"PeriodicalIF":2.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025322724001476/pdfft?md5=5889153e298ced6e1dd4aeb97f4b34e9&pid=1-s2.0-S0025322724001476-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141852204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Precipitation variation in the northern South China Sea of the last 700 years reconstructed by lagoon sediments 通过潟湖沉积物重建南海北部过去 700 年的降水变化
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-26 DOI: 10.1016/j.margeo.2024.107364
Tiantai Sun , Wenqing Yang , Huaineng Tang , Yikang Huang , Hongwei Liu , Liang Zhou , Yang Yang , Qibin Xu , Yuesong Gao , Zhouqing Xie
{"title":"Precipitation variation in the northern South China Sea of the last 700 years reconstructed by lagoon sediments","authors":"Tiantai Sun ,&nbsp;Wenqing Yang ,&nbsp;Huaineng Tang ,&nbsp;Yikang Huang ,&nbsp;Hongwei Liu ,&nbsp;Liang Zhou ,&nbsp;Yang Yang ,&nbsp;Qibin Xu ,&nbsp;Yuesong Gao ,&nbsp;Zhouqing Xie","doi":"10.1016/j.margeo.2024.107364","DOIUrl":"10.1016/j.margeo.2024.107364","url":null,"abstract":"<div><p>Precipitation changes in the East Asia are closely linked to the monsoonal climate in this region and the hydrothermal processes in the western tropical Pacific. However, trends of reconstructed precipitation records for the past millennium are inconsistent and the influencing factors are in dispute. Here we reconstruct a 700-year precipitation record for the northern South China Sea (SCS) using grain size of lagoon sediments. Our data revealed that precipitation increased in the early to middle Little Ice Age, possibly modulated by tropical cyclones and the Walker Circulation. The East Asian Summer Monsoon and Pacific Decadal Oscillation had the major influence on the precipitation changes in the northern SCS. This study provides new insight into the processes and the underlying mechanisms of climate changes in the SCS.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107364"},"PeriodicalIF":2.6,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141853161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Tropical cyclone activity over the past 1200 years at the Pelican Cays, Belize 伯利兹鹈鹕湾过去 1200 年的热带气旋活动
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-25 DOI: 10.1016/j.margeo.2024.107365
Chris L. Blanco , Andrea D. Hawkes , Elizabeth J. Wallace , Jeffrey P. Donnelly , Dana MacDonald
{"title":"Tropical cyclone activity over the past 1200 years at the Pelican Cays, Belize","authors":"Chris L. Blanco ,&nbsp;Andrea D. Hawkes ,&nbsp;Elizabeth J. Wallace ,&nbsp;Jeffrey P. Donnelly ,&nbsp;Dana MacDonald","doi":"10.1016/j.margeo.2024.107365","DOIUrl":"10.1016/j.margeo.2024.107365","url":null,"abstract":"<div><p>Tropical cyclone (TC) models indicate that continued planet warming will likely increase the global proportion of powerful TCs (specifically Categories 4 and 5 hurricanes), increasingly jeopardizing low-lying coastal communities and resources such as the Pelican Cays, Belize. The combination of increased coastal development and continued relative sea-level rise puts these communities at even higher risk of damage from TCs. The short TC observational record for the western Caribbean hampers the extensive study of TC activity on centennial timescales, which hinders our ability to fully understand past TC climatology and improve the accuracy of TC models. To better assess TC risk, paleotempestological studies are necessary to put future scenarios in perspective. Here, we present a high-resolution reconstruction of coarser-grained sediment deposits associated with TC (predominately ≥ Category 2 hurricanes) passages over the past 1200 years from Elbow and Lagoon Cays, two coral reef-bounded lagoons at the northern and southern end of the Pelican Cays; the most southern Belizean paleotempestological site to date. Coincident timing of historic storms with statistically significant coarser-grained deposits within cay lagoon sediment cores allows us to determine which historic TCs likely generated event layers (tempestites) archived in the sediment record. Our compilation frequency analysis indicates one active interval (above-normal TC activity) from 1740 to 1950 CE and one quiet interval (below-normal TC activity) from 850 to 1018 CE. The active and quiet intervals in the Pelican Cays composite record are anticorrelated with those from nearby and re-analyzed TC records to the north, including the Great Blue Hole (∼100 km north) and the Northeast Yucatan (∼380 km northwest). This site-specific anticorrelation in TC activity along the western Caribbean indicates that we cannot rely on any one single TC record to represent regional TC activity. However, we cannot discount that these anticorrelated periods between the western Caribbean sites are due to randomness. To confirm that the anticorrelation in TC activity among sites from the western Caribbean is indeed a function of climate change and not randomness, an integration of more records and TC model simulations over the past millennium is necessary to assess the significance of centennial-scale variability in TC activity recorded in reconstructions from the western Caribbean.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107365"},"PeriodicalIF":2.6,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141886996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Dismantling of an isolated tropical carbonate platform through flank collapse and canyon erosion, Coral Sea, Northeast Australia 澳大利亚东北部珊瑚海,一个孤立的热带碳酸盐平台通过侧翼崩塌和峡谷侵蚀而解体
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-14 DOI: 10.1016/j.margeo.2024.107361
Christian Betzler , Sebastian Lindhorst , Carola Hincke , Jan Oliver Eisermann , Or M. Bialik , Alex Petrovic , Jesus Reolid , Robin J. Beaman , Jody M. Webster , Thomas Lüdmann , Christian Hübscher
{"title":"Dismantling of an isolated tropical carbonate platform through flank collapse and canyon erosion, Coral Sea, Northeast Australia","authors":"Christian Betzler ,&nbsp;Sebastian Lindhorst ,&nbsp;Carola Hincke ,&nbsp;Jan Oliver Eisermann ,&nbsp;Or M. Bialik ,&nbsp;Alex Petrovic ,&nbsp;Jesus Reolid ,&nbsp;Robin J. Beaman ,&nbsp;Jody M. Webster ,&nbsp;Thomas Lüdmann ,&nbsp;Christian Hübscher","doi":"10.1016/j.margeo.2024.107361","DOIUrl":"10.1016/j.margeo.2024.107361","url":null,"abstract":"<div><p>The steep slopes of carbonate platforms frequently display large-scale sediment destabilization features like rockfalls, mass transport complexes, and slope erosion. The processes and factors triggering such instabilities and how they interact are a matter of ongoing discussion. We use hydroacoustic, sedimentological, and seafloor imaging data to map and characterize slope instabilities and potential controlling factors at the flank of the isolated Tregrosse carbonate bank in the Coral Sea, northeast Australia. Erosion of gullies and submarine valleys is concentrated in slope segments with the platform rim at several 10s of meters of water depth, i.e. where there is potential for sediment transfer from the bank interior to the slope. Gravity core data indicate that most sediment export from the platform occurs during sea-level fall. The toe of slopes neighboring segments with a shallower platform rim are mostly characterized by mass-transport complexes of platform rim and upper slope rocks forming extended block fields. Distal slope areas are dismantled through submarine landslides resulting in scalloped head scarps. The basal detachment surface of these submarine landslides appears to be rooted in several 100 s of meters in the subsurface at a lithological heterogeneity, which is documented by a gamma-ray peak in the downhole logging data from Ocean Drilling Program Site 817. Our findings show that (1) canyon erosion, (2) platform rim and upper slope destabilization as well as (3) lower slope dismantling, largely act independently of each other to destabilize the flanks of the carbonate bank. The complexity of the carbonate platform dismantling processes and the corresponding controlling factors shown in this study should also be considered when interpreting seismic morphological data.</p></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"475 ","pages":"Article 107361"},"PeriodicalIF":2.6,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0025322724001452/pdfft?md5=1c7e0f9debf2a162fc0f689984bba794&pid=1-s2.0-S0025322724001452-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141630565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Environmental history of the South Caspian Sea basin and its relation to the Siberian High dynamics since 14,000 years ago 自 1.4 万年前以来南里海盆地的环境历史及其与西伯利亚高原动态的关系
IF 2.6 3区 地球科学
Marine Geology Pub Date : 2024-07-11 DOI: 10.1016/j.margeo.2024.107356
Hadi Gerivani , Abdolmajid Naderi Beni , Suzanne A.G. Leroy , Hamid K.A. Lahijani
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