IF 5.8 1区地球科学

Geology Pub Date : 2026-01-29 DOI: 10.1130/g53641.1

Guihong Zhang, Yuntao Tian, Andrew V. Zuza, Junyi Li, Zengjie Zhang, Peizhen Zhang

{"title":"Plume-strengthened crust controlled post-Oligocene deformation partitioning in the southeastern Tibetan Plateau","authors":"Guihong Zhang, Yuntao Tian, Andrew V. Zuza, Junyi Li, Zengjie Zhang, Peizhen Zhang","doi":"10.1130/g53641.1","DOIUrl":"https://doi.org/10.1130/g53641.1","url":null,"abstract":"Upwelling mantle plumes are recognized to modify the continental lithosphere by building craton-like keels or inducing thermal erosion−related thinning. Such plume-related modification may exert long-term control over subsequent deformation and topographic evolution. In the southeastern Tibetan Plateau (SETP), the late Permian Emeishan large igneous province (ELIP), generated by mantle plume activity, significantly modified the lithospheric architecture in this region. However, current geodynamic models of Cenozoic plateau formation largely neglect the impact of ELIP-related lithospheric modification. Here, we investigated spatial variations in Cenozoic deformation and exhumation across the ELIP’s inner and intermediate zones. These zones span from the plume head to its periphery and are cut by two major Cenozoic faults: the Ailaoshan−Red River (ALS-RR) and Xianshuihe (XSH) faults. Our results reveal minimal post-Oligocene exhumation within the inner zone (0.05−0.15 km/m.y.), in contrast to higher rates in the intermediate zone (0.2−0.3 km/m.y.) and along the ALS-RR (0.4−2.5 km/m.y.) and XSH faults (0.4−0.9 km/m.y.). The limited exhumation corresponds to weak deformation within the inner zone. Integrating geological and geophysical data, we suggest that the late Permian plume activity emplaced voluminous mantle-derived mafic-ultramafic intrusions into the crust beneath the ELIP’s inner zone, increasing crustal rigidity and resistance to Cenozoic deformation and exhumation. Our findings highlight how plume-related lithospheric modification may exert a lasting influence on intraplate deformation, persisting hundreds of millions of years after plume cessation.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"83 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089739","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

Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada 来自阿瓦隆组合的埃迪卡拉末期和Kotlin危机的严重性：内草地的第一份文件Lagerstätte，纽芬兰，加拿大

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-29 DOI: 10.1130/g54217.1

D. McIlroy, S. Denyszyn, P. Olschewski, S. Rosse-Guillevic, H. Muirhead-Hunt, D. Pérez-Pinedo, C. McKean, G. Pasinetti, B. Rideout, M.P. Steele, L.R. Menon, J.M. Neville, N. Chida, R.S. Taylor

{"title":"Ediacaran endlings from the Avalon Assemblage and the severity of the Kotlin Crisis: First documentation of the Inner Meadow Lagerstätte, Newfoundland, Canada","authors":"D. McIlroy, S. Denyszyn, P. Olschewski, S. Rosse-Guillevic, H. Muirhead-Hunt, D. Pérez-Pinedo, C. McKean, G. Pasinetti, B. Rideout, M.P. Steele, L.R. Menon, J.M. Neville, N. Chida, R.S. Taylor","doi":"10.1130/g54217.1","DOIUrl":"https://doi.org/10.1130/g54217.1","url":null,"abstract":"The Ediacaran biota has been informally divided into three ecostratigraphic units: the lowermost deep marine Avalon Assemblage, the overlying shallow-marine White Sea Assemblage, and the uppermost Nama Assemblage. While there are some shared taxa among all three, they have been considered relatively robust, informal, biostratigraphic entities. We document a rich new fossil site that includes most of the Avalon Assemblage biota from the EM Coombs Surface at Inner Meadow, Newfoundland, Canada, and date it to 550.78 ± 0.60 Ma, equivalent to the youngest White Sea Assemblage faunas. This demonstrates that the Avalon and White Sea assemblages are contemporaneous, that the differences between them are ecological, not stratigraphic, and that the Avalon Assemblage biotas were also affected by the 550 Ma Kotlin Crisis that has hitherto been considered to only affect the White Sea Assemblage. The impoverished post-extinction Nama Assemblage succeeds the Kotlin Crisis, which our data reveal to be more profound than previously known. The Kotlin Crisis is considered to be the first significant extinction event experienced by the Eumetazoa, ∼10 m.y. before the Cambrian radiation.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"93 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089807","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

The Rhodope Metamorphic Complex as a case for extreme vertical extrusion 作为极端垂直挤压的一个案例的罗多布变质络合物

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-28 DOI: 10.1130/g53889.1

Iskander A. Muldashev, Thorsten J. Nagel

{"title":"The Rhodope Metamorphic Complex as a case for extreme vertical extrusion","authors":"Iskander A. Muldashev, Thorsten J. Nagel","doi":"10.1130/g53889.1","DOIUrl":"https://doi.org/10.1130/g53889.1","url":null,"abstract":"We explore the fate of subducted continental margins using thermomechanical modeling with constant-force boundary conditions. Under certain conditions, large volumes of upper crust can get subducted to mantle depth, detach from the slab, and rise through the upper plate’s lithosphere even against considerable compressive tectonic stress. At the surface, such an event is expressed as a phase of intense horizontal extension and magmatism internal of the oceanic suture zone. The process can create normal-fault-bounded core complexes hundreds of kilometers wide, in which metamorphic continental crust derived from the subducting plate is exposed. Horizontal tectonic stress and the thickness of the downgoing upper crust control the width of complexes, their topographic elevation, and the subduction depth of exposed rocks. We propose that the Rhodope Metamorphic Complex on the Balkan Peninsula represents a prime example for such vertical extrusion internal of a suture zone. Lower tectonic units in this domain exhibit Eocene high-pressure metamorphism and nappe stacking followed by massive magmatism and large-offset normal faulting. Despite more than 100 km of extension in Cenozoic times, the area still has thick crust. Our modeling results support schemes that attribute the lower units of the Rhodope Metamorphic Complex to the subducted Adriatic plate.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"8 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089742","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

Melt production and transport beneath the slow-spreading Mariana arc−back-arc system 在缓慢扩张的马里亚纳弧-弧后系统下熔体的产生和运输

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-28 DOI: 10.1130/g53706.1

Tae-shin Kim, Sung-Joon Chang

引用次数: 0

Tectonic controls on magma storage beneath a distributed volcanic field 构造对分布火山场下岩浆储存的控制

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-28 DOI: 10.1130/g54058.1

Ryan Porter, Eric Kiser, Mary R. Reid

引用次数: 0

Out-of-equilibrium growth recorded by mineral inclusions with implications for their suitability as melt proxies: Evidence from chromite 矿物包裹体记录的不平衡生长及其作为熔体代用物的适用性：铬铁矿的证据

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-22 DOI: 10.1130/g54021.1

Hadrien Henry, William D. Smith, Mathieu Rospabé, Anastassia Borisova, Georges Ceuleneer

引用次数: 0

From wide rifts to orogens: A new perspective for Proterozoic tectonics 从宽裂谷到造山带：元古代构造学的新视角

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-22 DOI: 10.1130/g54232.1

Youseph Ibrahim, Patrice F. Rey

引用次数: 0

Release of toxic-metal acid brines related to slumping of Cretaceous mudstones—Smoking Hills (Ingniryuat), Arctic Canada 加拿大北极Ingniryuat白垩纪泥岩滑塌相关的有毒金属酸盐水释放

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-20 DOI: 10.1130/g53747.1

Stephen E. Grasby, I. Rod Smith, Wanju Yuan, Andriy Sheremet

引用次数: 0

Marine large igneous provinces: Key drivers of Triassic recurrent extinction 海相大火成岩省：三叠纪反复灭绝的关键驱动因素

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-20 DOI: 10.1130/g53406.1

Jian-Jun Fan, Si-Lin Sun, Jian-Bo Zhou, Simon A. Wilde, Yang Wang, Jun-Pu Lv

引用次数: 0

Rising productivity drove marine euxinia during the Late Devonian mass extinctions 在泥盆纪晚期的大灭绝中，生产力的提高推动了海洋生物的灭绝

IF 5.8 1区地球科学

Geology Pub Date : 2026-01-14 DOI: 10.1130/g54182.1

Zhiguo Li, Ruoyuan Qiu, Thomas J. Algeo, Mingyu Zhao, Ting Chen, Yi Song, Geoffrey J. Gilleaudeau, Yefang Xing, Fang Huang, Genming Luo, Shucheng Xie

{"title":"Rising productivity drove marine euxinia during the Late Devonian mass extinctions","authors":"Zhiguo Li, Ruoyuan Qiu, Thomas J. Algeo, Mingyu Zhao, Ting Chen, Yi Song, Geoffrey J. Gilleaudeau, Yefang Xing, Fang Huang, Genming Luo, Shucheng Xie","doi":"10.1130/g54182.1","DOIUrl":"https://doi.org/10.1130/g54182.1","url":null,"abstract":"The relationship of oceanic anoxia to changes in marine productivity during the biocrises of the Late Devonian remains uncertain. We present zinc isotope (δ66Zn) data from the euxinic Upper Devonian Chattanooga Shale in the Dupont GHS core (Tennessee, USA), reflecting the Zn isotopic composition of Late Devonian seawater. From the lower Frasnian to the upper Famennian, δ66Zn values gradually increase, indicating a progressive rise in marine productivity. Strong correlations of this shift with redox proxies (UEF, MoEF, Corg/P; │r│ &gt; 0.88; p &lt;0.001; EF—enrichment factor) suggest that increased productivity was a key cause of contemporaneous marine euxinia and heightened ecological stress. Biomarker data record increasing inputs of terrestrial organic matter from higher plants, closely paralleling the shift in seawater Zn isotopes (r = +0.73; p &lt; 0.005). These collectively suggest that the enhanced terrestrial phosphorus flux associated with the expansion of terrestrial higher plants was the primary driver for the observed δ66Zn patterns (r = +0.88, root mean square error = 0.11‰). Our study highlights the potential role of rising marine primary productivity in triggering Late Devonian ecological crises (e.g., the Dasberg Event), providing a cautionary parallel to the expansion of modern coastal dead zones.","PeriodicalId":12642,"journal":{"name":"Geology","volume":"15 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145968338","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

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