A new U–Pb zircon age dating and palynological data from a Lower Permian section of the southernmost Paraná Basin,Brazil: Biochronostratigraphical and geochronological implications for Gondwanan correlations     

Ana Luisa Outa Mori  Paulo Alves de Souza  Juliana Charão Marques  Ricardo da Cunha Lopes 《Gondwana Research》2012,21(2-3):654-669

Index species useful for correlations with the International Stratigraphical Column are rare or absent in the Pennsylvanian–Permian strata of the Paraná Basin in Brazil, preventing accuracy in geochronologic assignments. Besides, absolute datings are very scarce in comparison with other Gondwana basins. This paper presents palynological data from an outcrop on the surroundings of the Candiota coal mine, southmost Brazil, from several levels of the Rio Bonito and Palermo formations. The presence of certain index species of spore–pollen allowed the recognition of two Permian palynozones: the Vittatina costabilis and the Lueckisporites virkkiae zones. Furthermore, U–Pb in zircons from a volcaniclastic level interbedded in the coal strata of the former unit was analyzed through LA-MC-ICP-MS method, providing a new absolute age dating of 281.4 ± 3.4 Ma (Cisuralian, Early Permian). This dating is assumed as the oldest occurrence of the L. virkkiae Zone in Paraná Basin, which contains index species that are widespread in other Gondwana basins. A well distributed surface boundary occurs in this section also, allowing local and regional correlations. These new biostratigraphical and geochronological data are integrated, in order to offer a deep analysis on the stratigraphical significance for correlations across the Occidental Gondwana.  相似文献   

Spatial distribution of sedimentary linear alkylbenzenes and faecal steroids of Santos Bay and adjoining continental shelf, SW Atlantic, Brazil: origin and fate of sewage contamination in the shallow coastal environment   总被引：1，自引：0，他引：1  

Martins CC  Ferreira JA  Taniguchi S  Mahiques MM  Bícego MC  Montone RC 《Marine pollution bulletin》2008,56(7):1359-1363

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Reply to Discussion “Geopolymers Based on Recycled Glass Powder for Soil Stabilization” Jair de Jesús Arrieta Baldovino,Ronaldo Luis dos Santos Izzo,Juliana Lundgren Rose,and Mônica Angélica Avanci     

de Jesús Arrieta Baldovino  Jair  dos Santos Izzo  Ronaldo Luis  Rose  Juliana Lundgren  Avanci  Mônica Angélica 《Geotechnical and Geological Engineering》2021,39(6):4655-4657

Geotechnical and Geological Engineering -  相似文献   

Consumption,ageing and identity: New Zealander's narratives of gifting,ridding and passing on     

Juliana Mansvelt 《New Zealand geographer》2012,68(3):187-200

Consumption practices involving disposal can provide important insights into how ‘being’ is accumulated. Analysis of 36 semi‐structured interviews with 13 individuals aged 59–70 in the Manawatu, Kapiti, Rangitikei and Horowhenua regions of the North Island in New Zealand illustrates how practices of gifting, ridding and passing on goods as legacy contribute to the production of familial and individual subjectivities. The research revealed that practices of disposal are performative, with both the absent presence of the objects placed away and the practices by which this occurs having agentic effects. The places that objects were assumed to occupy in the real and imagined lives of others and the moving of things away contributed to older adults' identities as caring parents, productive citizens and individuals of significance. Disposal practices consequently enabled participants to stabilise and order parent and child relations and one's relative position in the life course.  相似文献   

Statistical scale-up of 3D particle-tracking simulation for non-Fickian dispersive solute transport modeling     

Vikrant?Vishal  Juliana?Y.?LeungEmail authorView author&#;s OrcID profile 《Stochastic Environmental Research and Risk Assessment (SERRA)》2018,32(7):2075-2091

Numerical techniques for subsurface flow and transport modeling are often limited by computational limitations including fine mesh and small time steps to control artificial dispersion. Particle-tracking simulation offers a robust alternative for modeling solute transport in subsurface formations. However, the modeling scale usually differs substantially from the rock measurement scale, and the scale-up of measurements have to be made accounting for the pattern of spatial heterogeneity exhibited at different scales. Therefore, it is important to construct accurate coarse-scale simulations that are capable of capturing the uncertainties in reservoir and transport attributes due to scale-up. A statistical scale-up procedure developed in our previous work is extended by considering the effects of unresolved (residual) heterogeneity below the resolution of the finest modeling scale in 3D. First, a scale-up procedure based on the concept of volume variance is employed to construct realizations of permeability and porosity at the (coarse) transport modeling scale, at which flow or transport simulation is performed. Next, to compute various effective transport parameters, a series of realizations exhibiting detailed heterogeneities at the fine scale, whose domain size is the same as the transport modeling scale, are generated. These realizations are subjected to a hybrid particle-tracking simulation. Probabilistic transition time is considered, borrowing the idea from the continuous time random walk (CTRW) technique to account for any sub-scale heterogeneity at the fine scale level. The approach is validated against analytical solutions and general CTRW formulation. Finally, coarse-scale transport variables (i.e., dispersivities and parameterization of transition time distribution) are calibrated by minimizing the mismatch in effluent history with the equivalent averaged models. Construction of conditional probability distributions of effective parameters is facilitated by integrating the results over the entire suite of realizations. The proposed method is flexible, as it does not invoke any explicit assumption regarding the multivariate distribution of the heterogeneity. In contrast to other hierarchical CTRW formulation for modeling multi-scale heterogeneities, the proposed approach does not impose any length scale requirement regarding sub-grid heterogeneities. In fact, it aims to capture the uncertainty in effective reservoir and transport properties due to the presence of heterogeneity at the intermediate scale, which is larger than the finest resolution of heterogeneity but smaller than the representative elementary volume, but it is often comparable to the transport modeling scale.  相似文献   

An Improved Workflow for Permeability Estimation from Image Logs with Uncertainty Quantification     

Rezvandehy  Mehdi  Leung  Juliana Y.  Ren  Weishan  Hollands  Ben  Pan  Guoai 《Natural Resources Research》2019,28(3):777-811

Natural Resources Research - Production forecasts are extremely sensitive to the spatial distribution of certain reservoir parameters, especially permeability, which controls fluid flow and...  相似文献   

Special Issue: IAMG 2019     

Leung  Juliana Y.  Li  Liangping  Morgan  Eugene  Emami-Meybodi  Hamid 《Mathematical Geosciences》2020,52(8):975-976

Mathematical Geosciences -  相似文献   

Quantifying and monetizing potential climate change policy impacts on terrestrial ecosystem carbon storage and wildfires in the United States     

David Mills  Russell Jones  Karen Carney  Alexis St. Juliana  Richard Ready  Allison Crimmins  Jeremy Martinich  Kate Shouse  Benjamin DeAngelo  Erwan Monier 《Climatic change》2015,131(1):163-178

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Integrated assessment of smallholder farming’s vulnerability to drought in the Brazilian Semi-arid: a case study in Ceará   总被引：1，自引：0，他引：1  

Diego Pereira Lindoso  Juliana Dalboni Rocha  Nathan Debortoli  Izabel Ibiapina Parente  Flávio Eiró  Marcel Bursztyn  Saulo Rodrigues-Filho 《Climatic change》2014,127(1):93-105

Smallholder farming is among the most vulnerable sectors due to its great social and economic sensitivity. Despite future climate change, current climate variability is already an issue of concern that justifies adaptation efforts. In Brazil, the Semi-Arid Region is a climate hotspot, well known for both historic socioeconomic setbacks, and agriculture failures caused by dry spells and severe droughts. In 2010, the Brazilian government enacted the National Policy on Climate Change, which states as one of its key goals the identification of vulnerabilities and the adoption of adequate measures of adaptation to climate change. The improvement of vulnerability assessment tools is a response to the growing demand of decision makers for regular information and indicators with high spatial and temporal resolution. This article aims at undertaking a comparative assessment of smallholder farming’s vulnerability to droughts. An integrated assessment system has been developed and applied to seven municipalities located in the Brazilian Semi-Arid Region (within the State of Ceará). Results show regional vulnerability contrasts driven by institutional and socioeconomic factors, beyond climatic stressors.  相似文献   

New chelid turtles of the lower section of the Cerro Barcino formation (Aptian-Albian?), Patagonia, Argentina     

Marcelo S. de la Fuente  Aldo M. Umazano  Juliana Sterli  José L. Carballido 《Cretaceous Research》2011,32(4):527-537

A new chelid species (Prochelidella cerrobarcinae nov. sp.) are described from the Aptian-Albian? Puesto La Paloma Member, Cerro Barcino Formation, northern of Chubut Province, Argentina. The basal section of this member, which bears the turtle remains, is composed of tuffaceous mudstones with plane parallel lamination, asymmetrical ripples and a chert intercalation suggesting sub-aqueous deposition in a relatively shallow lacustrine environment. Pr. cerrobarcinae nov. sp. is represented by post-cranial remains of several specimens that not only represents the oldest pleurodiran chelid record in the world but, together with the chelid remains of Albian Lightning Ridge, New South Wales, Australia, indicates that chelid diversification began well before the final fragmentation of southern Gondwana.  相似文献