Geology最新文献 - Book学术

Submarine volcanism along shallow ridges did not drive Cryogenian cap carbonate formation: REPLY 沿浅海脊的海底火山活动并没有推动低温元古代碳酸盐盖的形成：答复

IF 5.8 1区地球科学

Geology Pub Date : 2024-08-01 DOI: 10.1130/g52425y.1

Adriana Dutkiewicz, R. Dietmar Müller

引用次数: 0

Deformation of the Gruithuisen region lava tube under compressional stress on the Moon 月球上格鲁伊图森地区熔岩管在压缩应力作用下的变形

IF 5.8 1区地球科学

Geology Pub Date : 2024-08-01 DOI: 10.1130/g52143.1

K.B. Kimi, Harish Harish, K.S. Sharini, Anil Chavan, S. Vijayan

{"title":"Deformation of the Gruithuisen region lava tube under compressional stress on the Moon","authors":"K.B. Kimi, Harish Harish, K.S. Sharini, Anil Chavan, S. Vijayan","doi":"10.1130/g52143.1","DOIUrl":"https://doi.org/10.1130/g52143.1","url":null,"abstract":"The lava tube in the Gruithuisen region on the Moon is intriguing because it is characterized by a distinctive chain of collapsed pits and raised features, providing an opportunity to understand the potential morphologic deformation of lunar lava tubes under compressional stress. This study aimed to understand the morphological deformation in the Gruithuisen region’s lava tube when subjected to compressional stress. A combination of numerical simulations and morphometric analysis was employed to achieve this objective. The morphometric analysis of different collapsed and raised features associated with a lava tube in the study area revealed eight characteristic morphologies ranging from curvilinear channel-like to elliptical shape. Notably, average normal stress and strain values derived from a wrinkle ridge were found to be ~70 MPa and 2 × 10−3, respectively, and wrinkle ridges exhibited a northward orientation. These quantified parameters were utilized as the foundation for initializing three-dimensional models. Furthermore, the outcomes of the models closely replicated the deformation in the Gruithuisen region, emphasizing the significant role of compressional stress in the deformation of the lava tube. These models suggest that the observed eight unique features associated with the lava tube arise from disparities in displacement magnitude and direction along three axes (x, y, z). Our research sheds light on the structural transformations of lava tubes when subjected to varying compressional stress and enhances understanding of the ways in which the interplay between compressional tectonic activity and lava tube features has shaped the Moon’s surface.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"72 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141794821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Submarine volcanism along shallow ridges did not drive Cryogenian cap carbonate formation: COMMENT 沿浅海脊的海底火山活动并没有推动低碳盖碳酸盐的形成：评论

IF 5.8 1区地球科学

Geology Pub Date : 2024-08-01 DOI: 10.1130/g52317c.1

Thomas M. Gernon, Thea K. Hincks, Toby Tyrrell, Eelco J. Rohling, Martin R. Palmer

引用次数: 0

First documentation of Late Paleozoic conodonts from Argentina: Biostratigraphic and paleoclimatic constraints for the Late Paleozoic Ice Age in SW Gondwana 阿根廷晚古生代锥齿动物的首次文献记载：冈瓦纳西南部晚古生代冰期的生物地层学和古气候制约因素

IF 5.8 1区地球科学

Geology Pub Date : 2024-08-01 DOI: 10.1130/g52133.1

Gustavo G. Voldman, Gabriela A. Cisterna, Andrea F. Sterren, Miguel Ezpeleta, James E. Barrick

引用次数: 0

Scoria cone erosional degradation by incision: Different behaviors in three volcanic fields reflect environmental conditions 火山锥因切割而侵蚀退化：三个火山区的不同行为反映了环境条件

IF 5.8 1区地球科学

Geology Pub Date : 2024-07-01 DOI: 10.1130/g52113.1

M.C. Zarazúa-Carbajal, G.A. Valentine, S. De la Cruz-Reyna

引用次数: 0

Bacterial magnetofossil evidence for enhanced Pacific Ocean respired carbon storage during buildup of Antarctic glaciation 细菌磁化石证明南极冰川期太平洋呼吸碳储存增加

IF 5.8 1区地球科学

Geology Pub Date : 2024-07-01 DOI: 10.1130/g52016.1

Dunfan Wang, Yihui Chen, Yan Liu, Andrew P. Roberts, Eelco J. Rohling, Xiangyu Zhao, Xu Zhang, Jinhua Li, Weiqi Yao, Xuejiao Qu, Xianfeng Tan, Qingsong Liu

{"title":"Bacterial magnetofossil evidence for enhanced Pacific Ocean respired carbon storage during buildup of Antarctic glaciation","authors":"Dunfan Wang, Yihui Chen, Yan Liu, Andrew P. Roberts, Eelco J. Rohling, Xiangyu Zhao, Xu Zhang, Jinhua Li, Weiqi Yao, Xuejiao Qu, Xianfeng Tan, Qingsong Liu","doi":"10.1130/g52016.1","DOIUrl":"https://doi.org/10.1130/g52016.1","url":null,"abstract":"Global cooling with the onset of Antarctic glaciation ca. 34 Ma across the Eocene-Oligocene transition (EOT) terminated the early Cenozoic greenhouse climate state and marked the beginning of icehouse conditions. Although a pCO2 decline is considered to have been a major cause of this climate shift, the associated carbon-sequestration mechanism remains unclear. Here, we assessed ocean production and circulation changes across the EOT using numerical simulations combined with a novel proxy, namely, bacterial magnetofossils, the abundance and morphology of which are sensitive to sedimentary organic matter accumulation and oxygenation. We detected production and oxygenation declines in the equatorial Pacific Ocean coeval with increased biological production in the Southern Ocean after the EOT. Corroborated by simulation results and evidence from the Subantarctic region, we interpret this counterintuitive combination as a result of enhanced bottom-water formation and biological pump efficiency in the Southern Ocean due to Antarctic glacial buildup across the EOT. These results provide key evidence for deep Pacific Ocean deoxygenation and increased respired carbon concentrations, which amplified CO2 decline across the EOT.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"72 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141463916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Landscapes on the edge: River intermittency in a warming world 边缘景观：变暖世界中的河流间歇

IF 5.8 1区地球科学

Geology Pub Date : 2024-07-01 DOI: 10.1130/g52043.1

Jonah S. McLeod, Alexander C. Whittaker, Rebecca E. Bell, Gary J. Hampson, Stephen E. Watkins, Sam A.S. Brooke, Nahin Rezwan, Joel Hook, Jesse R. Zondervan, Vamsi Ganti, Sinéad J. Lyster

{"title":"Landscapes on the edge: River intermittency in a warming world","authors":"Jonah S. McLeod, Alexander C. Whittaker, Rebecca E. Bell, Gary J. Hampson, Stephen E. Watkins, Sam A.S. Brooke, Nahin Rezwan, Joel Hook, Jesse R. Zondervan, Vamsi Ganti, Sinéad J. Lyster","doi":"10.1130/g52043.1","DOIUrl":"https://doi.org/10.1130/g52043.1","url":null,"abstract":"Sediment transport in rivers is not steady through time. Highly intermittent river systems, which only transport bedload during the most significant flow events, are particularly sensitive to changes in climate and precipitation patterns. People and landscapes can be vulnerable to fluvial processes, and quantifying river intermittency is critical for assessing landscape response to projected changes in precipitation extremes due to climate change. We generated new constraints on recent to modern fluvial intermittency factors—the frequency at which bedload is mobilized in a river—based on field measurements in the Corinth Rift, Greece, and Holocene sediment accumulation rates. Results reveal some of the lowest documented intermittency factors to date, showing Mediterranean rivers can transport an entire annual sediment load in a rare storm event. Coupling intermittency calculations with historical flood and precipitation data indicates these rivers transport bedload during one storm every ~4 yr, associated with rainfall >50 mm/d, and subsequent floods; this hydroclimate is typical across the Mediterranean region. Furthermore, climate models predict precipitation extremes will increase across Europe, and the frequency of events that surpass thresholds of sediment transport will increase significantly, potentially causing sediment loads to double by 2100 CE. As the area of arid land likely to host intermittent rivers also increases, sensitive landscapes are on the edge of significant geomorphic change, driven by global warming.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"92 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141475316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Fluvial response to Late Pleistocene–Holocene climate change in the Colorado River drainage, central Texas, USA: COMMENT 美国得克萨斯州中部科罗拉多河流域晚更新世-全新世气候变化的冲积响应：COMMENT

IF 5.8 1区地球科学

Geology Pub Date : 2024-05-01 DOI: 10.1130/g51850c.1

Mike Blum, Dustin Sweet

引用次数: 0

Fluvial response to Late Pleistocene–Holocene climate change in the Colorado River drainage, central Texas, USA: REPLY 美国得克萨斯州中部科罗拉多河流域晚更新世-全新世气候变化的冲积响应：REPLY

IF 5.8 1区地球科学

Geology Pub Date : 2024-05-01 DOI: 10.1130/g52087y.1

E. Gabriela Gutiérrez, Daniel F. Stockli

引用次数: 0

Ice-rafted dropstones at midlatitudes in the Cretaceous of continental, Iberia: REPLY 伊比利亚大陆白垩纪中纬度地区的冰蚀滴石：REPLY