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High-precision geochronology of Mesozoic magmatism in Macao,Southeast China:Evidence for multistage granite emplacement

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Geoscience Frontiers 2020年第1期11卷 243-263页

作者： Pedro Quelhas Agata Alveirinho Dias joao mata Donald Wayne Davis Maria Luísa Ribeiro Institute of Science and Environment University of Saint JosephMacaoChina Instituto Dom Luiz Faculdade de CiênciasUniversidade de LisboaLisboaPortugal Jack Satterly Geochronology Laboratory Department of Earth SciencesUniversity of TorontoTorontoOntCanada Laboratório Nacional de Engenharia e Geologia LisboaPortugal

Six new high precision U-Pb zircon ID-TIMS ages plus thirteen in situ high spatial resolution U-Pb zircon LA-MC-ICPMS ages are reported from Jurassic plutonic(metaluminous to weakly peraluminous biotite granites)and Jurassic to Cretaceous hypabyssal(dacites)rocks from *** its relatively small area(~30 km^2),the new ages tightly constrain the Macao granitic magmatism to two periods ranging from 164.5±0.6 Ma to 162.9±0.7 Ma and 156.6±0.2 Ma to 155.5±0.8 Ma,separated by ca.6 *** zircons point to the existence of a basement with ages up to Paleo-Proterozoic and late Archean in the *** addition,younger dacitic rocks were dated at 150.6±0.6 Ma and<120 Ma.U-Pb zircon ages and whole-rock REE data of Macao granites indicate that the first pulse is also represented in Hong Kong and Southeast(SE)China,while magmatism with the chemical characteristics of the second pulse seems to not be represented outside *** two granitic magmatic pulses have distinct mineralogical and geochemical features that support their discrete nature rather than a continuum of comagmatic activity and suggest that the Macao granitic suite was incrementally assembled during a period of ca.9 Ma,a hypothesis also extendable to the neighboring Hong Kong region for a time lapse of ca.24 *** Macao,the transition from granitic magmatism(Middle to Upper Jurassic)to the younger dacite dykes(Upper Jurassic to Lower Cretaceous)most likely corresponds to a change in the regional tectonic setting,from an extensional regime related with foundering of the subducting paleoPacific plate during the Early Yanshanian period to the reestablishment of a normal subduction system in SE China during the Late Yanshanian period.

关键词： Granites U-Pb geochronology Zircon Jurassic Yanshanian orogeny Macao

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Refining the Stratigraphy of the Taghdout Group by Using the U-Pb Geochronology of the Taghdout Sill(Zenaga inlier,Anti-Atlas,Morocco)

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 1-页

作者： Abdelhak AIT LAHNA Colombo Celso Gaeta TASSINARI Nasrrddine YOUBI Hassan ADMOU joao mata El Hafid BOUOUGRI Latifa CHAIB Richard E.ERNST Ulf SODERLUND Moulay Ahmed BOUMEHDI Mohamed Khalil BENSALAH El Mostapha AARAB Department of Geology Faculty of Sciences-SemlaliaCadi Ayyad University Centro de Pesquisas Geocronológicas(CPGeo) Instituto de Geociencias(IG)Universidade de Sao Paulo-USP Instituto Dom Luiz Faculdade de CiênciasUniversidade de Lisboa Department of Earth Sciences Carleton University Department of Geology Lund University

The Anti-Atlas belt of southern Morocco is situated on the northern edge of the West African craton(WAC).It corresponds to a broad anticlinorium some 800 km long and 200 km wide,trending ENE-WSW,parallel to the

关键词： Pb Zenaga inlier Morocco Refining the Stratigraphy of the Taghdout Group by Using the U-Pb Geochronology of the Taghdout Sill Anti-Atlas

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Genetic Divergence among Progenies Resulting from the Crossing of Groups Coffee Timor Hybrid and Dilla ＆ Alghe

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Journal of Agricultural Science and Technology(B) 2013年第12期3卷 865-872页

作者： Janine Magalhaes Guedes Juliana Costa Rezende joao Marcos Rodrigues Andrade Lara Samuel Pereira Carvalho Antonio Alves Pereira Alex Mendonca de Carvalho Department of Agriculture-UFLA Federal University of Lavras DAG-Cx. P. 3037-37.200-000 Lavras MG Brazil Agricultural Research Company of Minas Gerais-Technological Center in South of Minas Campus UFLA Cx P. 179 37200-000Lavras MG Brazil Agricultural Research Company of Minas Gerais -Technological Center in Zona da mata Campus UFV Cx P. 216 - 36571-000Vigosa MG Brazil

This study aimed to agronomically and morphologically characterize, as well as analyze the genetic divergence of Dilla ＆ Alghe x Timor hybrid progenies of the coffee germplasm bank of Minas Gerais in Brazil to improve the breeding and management schemes of the hybrids. Forty-two morpho-agronomic traits were evaluated and the generalized Mahalanobis distance was used to quantify the genetic divergence among progenies. Tocher clustering, unweighted pair-group method using arithmetic averages （UPGMA） method and canonical variation analysis were employed as clustering strategies. The Tocher and UPGMA methods have been separated the progenies into eight and five groups, respectively. Analysis of the relative contribution of each characteristic to genetic dissimilarity highlighted the characteristics of production in liters in 2009, production notes in 2009, and average uniformity of maturation in 2009 as those that contributed most to obtaining genetic divergence. The authors observed that the first three canonical variables accounted for over 99% of the total variance observed in the full set of analyzed characteristics. High variability was observed among the 15 progenies of Dilla ＆ Alghe × Timor hybrid progenies. The progenies MG0589 and MG0592, MG0593 and MG0589, MG0591 and MG0589, MG0589 and MG0588, MG0589 and MG0583 were the most suitable crosses for exploring the genetic variability in Dilla ＆ Alghe × Timor hybrid generated from the germplasm bank of Minas Gerais. Through these crossovers, it is expected to get new coffee cultivars with desirable agronomic characteristics, as resistant to Pseudomonas xyringae pv. garcae and some breeds ofHemileia vastatrix.

关键词： Coffea arabica multivariate analysis germplasm bank genetic improvement morpho-agronomic traits.

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