检索结果-南通市图书馆

Chemical-Abrasion U-Pb zircon geochronology reveals 150 Myr of partial melting events in the Archean crust of the São Francisco Craton

引用

Geoscience Frontiers 2022年第5期13卷 169-189页

作者： Lorena Martins Cristiano Lana Ariela Mazoz tiago novo Applied Isotope Research Group Departamento de GeologiaEscola de MinasUniversidade Federal de Ouro PretoMorro do CruzeiroOuro PretoMG35400-000Brazil Universidade Federal de Minas Gerais Programa de Pós-Graduação em GeologiaIGC-CPMTCCampus PampulhaAv.Antônio Carlos 6627Belo HorizonteMG31270-901Brazil

Field observations and CA-LA-ICP-MS U–Pb zircon ages and Hf isotope compositions obtained from migmatitic orthogneisses and granitoids from the Belo Horizonte Complex,southern São Francisco Craton,indicate a major period of partial melting and production of felsic rocks in the *** observations show that the complex is an important site for studying partial melting processes of Archean crystalline *** of the complex exposes fine-grained stromatic migmatites that are intruded by multiple leucogranitic veins and sheeted *** migmatites and leucogranite sheets are crosscut by several phases of granitoid batholiths and small granitic bodies;both of which are closely associated with the host banded *** abrasion followed by detailed cathodoluminescence imaging revealed a wide variety of zircon textures that are consistent with a long-lived period of partial melting and crustal *** of U-Pb and Hf isotopes disclose the complex as part of a much wider crustal segment,encompassing the entire southern part of the São Francisco *** of available U-Pb ages suggests that this crustal segment was consolidated sometime between 3000 Ma and 2900 Ma and that it experienced three main episodes of partial melting before stabilization at 2600 *** partial melting episodes took place between 2750 Ma and 2600 Ma as a result of tectonic accretion and peeling off the lithospheric mantle and lower *** process is likely responsible for the emplacement of voluminous potassic granitoids across the entire São Francisco *** believe that the partial melting of Meso-Archean crystalline crust and production of potassic granitoids are linked to a fundamental shift in the tectonics of the craton,which was also responsible for the widespread intrusion of large syenitic bodies in the northern part of the craton,and the construction of layered mafic–ultramafic intrusions to the south of the BHC.

关键词： Archean São Francisco Craton Crustal reworking U-Pb geochronology Lu-Hf isotopes

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

New insights from low-temperature thermochronology into the tectonic and geomorphologic evolution of the south-eastern Brazilian highlands and passive margin

引用

Geoscience Frontiers 2020年第1期11卷 303-324页

作者： Gerben Van Ranst Antônio Carlos Pedrosa-Soares tiago novo Pieter Vermeesch Johan De Grave Laboratory for Mineralogy and Petrology Department of GeologyGhent UniversityKrijgslaan 281 S89000GhentBelgium CPMTC Institute for GeosciencesFederal University of Minas GeraisAvenida Antônio Carlos 6627CEP 31270-901Belo HorizonteBrazil Department of Earth Sciences University College London5 Gower PlaceWC1E 6BSLondonUnited Kingdom

The South Atlantic passive margin along the south-eastern Brazilian highlands exhibits a complex landscape,including a northern inselberg area and a southern elevated plateau,separated by the Doce River *** landscape is set on the Proterozoic to early Paleozoic rocks of the region that once was the hot core of the Aracuai orogen,in Ediacaran to Ordovician *** to the break-up of Gondwana and consequently the opening of the South Atlantic during the Early Cretaceous,those rocks of the Araquai orogen became the basement of a portion of the South Atlantic passive margin and related southeastern Brazilian *** goal is to provide a new set of constraints on the thermo-tectonic history of this portion of the south-eastern Brazilian margin and related surface processes,and to provide a hypothesis on the geodynamic context since *** this end,we combine the apatite fission track(AFT)and apatite(U-Th)/He(AHe)methods as input for inverse thermal history *** our AFT and AHe central ages are Late Cretaceous to early *** AFT ages vary between 62 Ma and90 Ma,with mean track lengths between 12.2μm and 13.6μ*** ages are found to be equivalent to AFT ages within uncertainty,albeit with the former exhibiting a lesser degree of *** relate this Late Cretaceous-Paleocene basement cooling to uplift with accelerated denudation at this *** variation of the denudation time can be linked to differential reactivation of the Precambrian structural network and differential erosion due to a complex interplay with the drainage *** argue that posterior large-scale sedimentation in the offshore basins may be a result of flexural isostasy combined with an expansion of the drainage *** put forward the combined compression of the Mid-Atlantic ridge and the Peruvian phase of the Andean orogeny,potentially augmented through the thermal weakening of the lower crust by the Trindade thermal anomaly,as a probable cause for th

关键词： Tectonic reactivation Differential denudation Passive margin South-eastern Brazil Apatite fission tracks Apatite(U-Th)/He

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Control of inherited structural fabric on the development and exhumation of passive margins-Insights from the AraçuaíOrogen(Brazil)

引用

Geoscience Frontiers 2023年第6期14卷 30-48页

作者： Ana Fonseca tiago novo Tobias Fonte-Boa Matheus Kuchenbecker Daniel Galvão Carnier Fragoso Daniel Peifer Antônio Carlos Pedrosa-Soares Johan De Grave Laboratory for Mineralogy and Petrology Department of GeologyGhent UniversityKrijgslaan 281 S89000 GhentBelgium Universidade Federal de Minas Gerais Programa de Pós-Graduação em GeologiaCPMTC-IGCCampus PampulhaBelo HorizonteMGBrazil Centro de Pesquisas Professor Manoel Teixeira da Costa Instituto de GeociênciasUniversidade Federal de Minas GeraisBelo HorizonteBrazil Universidade Federal dos Vales do Jequitinhonha e Mucuri Instituto de Ciência e TecnologiaCentro de Estudos em GeociênciasLaboratório de Estudos TectônicosDiamantinaBrazil Petrobras Rio de JaneiroRJBrazil Instituto de Geociências Universidade Federal do Rio Grande do SulPorto AlegreRSBrazil Department of Geosciences University of TübingenSchnarrenbergstr.94-9672076 TübingenGermany

The AraçuaíOrogen,in eastern Brazil,was formed during the Neoproterozoic–Cambrian amalgamation of West *** the Mesozoic–Cenozoic opening of the South Atlantic Ocean,and the associated divergent tectonics,the orogen developed as basement to the passive margin of South America and was progressively covered by thick offshore sedimentary basins,particularly the Espírito Santo,Mucuri,and Cumuruxatiba basins,in which hydrocarbon systems have been *** understanding of the AraçuaíOrogen’s passive margin evolution,erosion,and sediment transfer to these basins ultimately depends on constraining the onshore exhumation in response to Mesozoic–Cenozoic ***,new and previously published data from apatite fission-track(AFT)analyses and inverse thermal history modelling of(Pre)Cambrian basement rocks from the AraçuaíOrogen resolve three discrete basement cooling and associated erosional exhumation *** the Pre-Rift phase,Jurassic–Hauterivian erosion of the AraçuaíOrogen is most likely related to the adjoining intra-continental West Gondwana flexural subsidence,which increased hillslope and river erosion *** the Rift and Transitional phases,Barremian–Albian accelerated phase of erosion is associated with the uplift of the Atlantic rift shoulders and the establishment of an oceanic *** the Drift phase,reactivations in response to far-field stresses likely triggered a Late Cretaceous–Paleocene rapid erosion *** rates at which these events unfolded vary spatially and are controlled by inherited *** AraçuaíOrogen experienced slower denudation rates in areas closer to the São Francisco Craton,which suggests that the tectonic reactivation and related surface uplift during the Mesozoic–Cenozoic is in first-order controlled by lithospheric ***,the structural framework of the Paramirim and Pirapora aulacogens and NE-oriented shear zones in the orogen’s southeast facilitated later *** the spati

关键词： Thermal history Denudation Tectonic inheritance Reactivations South Atlantic Hydrocarbons

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluation of biodegradable electric conductive tube-guides and mesenchymal stem cells

引用

World Journal of Stem Cells 2015年第6期7卷 956-975页

作者： Jorge Ribeiro tiago Pereira Ana Rita Caseiro Paulo Armada-da-Silva Isabel Pires Justina Prada Irina Amorim Sandra Amado Miguel Franca Carolina Goncalves Maria Ascensao Lopes Jose Domingos Santos Dina Morais Silva Stefano Geuna Ana Lúcia Luís Ana Colette Maurício Departmento de Clínicas Veterinárias and+UPVet Instituto de Ciencias Biomedicas de Abel Salazar(ICBAS)and Centro de Estudos de Ciencia Animal(CECA)Instituto de CienciasTecnologias e Agroambiente da Universidade do Porto(ICETA)Rua de Jorge Viterbo Ferreira4050-313 PortoPortugal Centro Interdisciplinar de Estudo de Performance Humana(CIPER) Faculdade de Motricidade Humana(FMH)Universidade de Lisboa(UL)Estrada da Costa1499-002 Cruz QuebradaDafundoPortugal CECAV and Departamento de Ciencias Veterinárias Universidade de Trás-os-Montes e Alto Douro(UTAD)5001-801 Vila RealPortugal Departmento de Patologia e de Imunologia Molecular Instituto de Ciencias Biomedicas de Abel SalazarRua de Jorge Viterbo Ferreira4050-313 PortoPortugal Instituto Português de Patologia e Imunologia Molecular da Universidade do Porto(IPATIMUP) Rua Dr.Roberto Frias s/n4200-465 PortoPortugal UIS-IPL:Unidade de Investigacao em Saúde da Escola Superior de Saúde de Leiria Instituto Politécnico de Leiria2411-901 LeiriaPortugal CEMUC Departamento de Engenharia Metalúrgica e MateriaisFaculdade de Engenharia da Universidade do Porto(FEUP)Rua Dr.Roberto Frias4200-465 PortoPortugal Biosckin Molecular and Cell Therapies S.A.Tec MaiaRua Engenheiro Frederico Ulrich 26504470-605 MaiaPortugal Neuroscience Institute of the Cavalieri Ottolenghi Foundation and Department of Clinical and Biological Sciences University of Turin

AIM: To study the therapeutic effect of three tubeguides with electrical conductivity associated to mesenchymal stem cells(MSCs) on neuro-muscular regeneration after ***: Rats with 10-mm gap nerve injury were tested using polyvinyl alcohol(PVA), PVA-carbon nanotubes(CNTs) and MSCs, and PVA-polypyrrole(PPy). The regenerated nerves and tibialis anterior muscles were processed for stereological studies after 20 wk. The functional recovery was assessed serially for gait biomechanical analysis, by extensor postural thrust, sciatic functional index and static sciatic functionalindex(SSI), and by withdrawal reflex latency(WRL). In vitro studies included cytocompatibility, flow cytometry, reverse transcriptase polymerase chain reaction and karyotype analysis of the MSCs. Histopathology of lung, liver, kidneys, and regional lymph nodes ensured the biomaterials biocompatibility. RESULTS: SSI remained negative throughout and independently from treatment. Differences between treted groups in the severity of changes in WRL existed, showing a faster regeneration for PVA-CNTs-MSCs(P < 0.05). At toe-off, less acute ankle joint angles were seen for PVA-CNTs-MSCs group(P = 0.051) suggesting improved ankle muscles function during the push off phase of the gait cycle. In PVA-PPy and PVA-CNTs groups, there was a 25% and 42% increase of average fiber area and a 13% and 21% increase of the "minimal Feret's diameter" respectively. Stereological analysis disclosed a significantly(P < 0.05) increased myelin thickness(M), ratio myelin thickness/axon diameter(M/d) and ratio axon diameter/fiber diameter(d/D; g-ratio) in PVA-CNT-MSCs group(P < 0.05). CONCLUSION: Results revealed that treatment with MSCs and PVA-CNTs tube-guides induced better nerve fiber regeneration. Functional and kinematics analysis revealed positive synergistic effects brought by MSCs and PVA-CNTs. The PVA-CNTs and PVA-PPy are promising scaffolds with electric conductive properties, bio- and cytocompatible th

关键词： Nerve regeneration Neurotmesis Tubeguides Mesenchymal stem cells Carbon nanotubes Functional assessment Gait biomechanical analysis Histomorfometry Polyvinyl alcohol

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：