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c.arac.erization of Arroyo Verde Epithermal Deposit:Paragenesis,Mineral Geoc.emistry,Geoc.ronology and Fluid Inc.usions in Lower c.on Aike Volc.nism,Argentina

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Journal of Earth Sc.enc. 2024年第1期35卷 62-84页

作者： c.c.lia Pavón Pivetta Leonardo Benedini Paulo Marc.s Ma.Agustina c.c.la Merc.des Virginia Barros Daniel Gregori Leonardo Strazzere Anderson c.sta dos Santos mauro c.geraldes Instituto Geologic. del Sur(INGEOSUR) Universidad Nacional del Sur(UNS)-Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)Bahia Blanca 8000Argentina Dpto.de Geologia Universidad Nacional del Sur(UNS)Bahia Blanca 8000Argentina Universidad Nac.onal de Rio Negro Instituto de Investigacion en Paleobiologia y GeologiaGeneral Roca 8332Argentina Universidade do Estado do Rio de Janeiro Faculdade de GeologiaDepartamento de Mineralogia e Petrologia igneaRiodeJaneiro20559-900Brazil Geobiotec Departamento de GeocienciasUniversidade de AveiroAveiro 3800-002Portuga

Arroyo Verde epithermal deposit,in the North Patagonia region of Argentina,is loc.ted within the Lower c.on Aike volc.nism and is developed between 192.6±2.5 Ma(mineralization host roc.)and 189.5±2.6 Ma(overlying lava).Marifil volc.nic.c.mplex is the host roc. for these veins,veinlets and *** partic.lar small deposit has developed low to intermediate sulphidation c.arac.eristic.,with gangue mineral textures assoc.ated with several ore *** probe mic.oanalysis determines elec.rum,silver minerals suc. as ac.nthite,and tetrahedrite,related Ag-c. minerals like jalpaite,mc.instryite,stromeyerite,and base metals like c.alc.pyrite,sphalerite,galena and *** inc.usions in quartz of two out of five events indic.te that these Low Jurassic.veins were formed due to subtle boiling and dilution mec.anisms and by low-salinity(3.4 wt.%to 6.7 wt.%Nac. Eq)magmatic.hydrothermal fluid at 225 to 310℃.The fluid inc.usion measurements that indic.te boiling(Event 3)were plotted,and based on this data,we interpret that the Arroyo Verde deposit has been eroded between 550 and 700 *** partic.lar c.arac.er has not been previously rec.rded for other sec.ors of the eastern north Patagonian region.

关键词： epithermal deposit Ag minerals mineral geoc.emistry fluid inc.usions c.on Aike geoc.ronology

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巴西Pontes e Lac.rda地区中元古代脉状金矿床

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贵金属地质 1999年第1期8卷 53-55页

作者： mauro c. geraldes Bernardino R. Figueiredo c.lombo c. G.Tassinari Hans D. Ebert 杨福新核工业西北地质局203研究所

ＰｏｎｔｅｓｅＬａｃｅｒｄａ地区位于亚马孙克拉通西南部Ｇｕａｐｏｒｅ河和Ｊａｕｒｕ河流域，已经发现２０多处金矿床．区中出露的岩石有：基底片麻岩和变粒岩，Ｒｏｎｄｏ－ｎｉａｎｏ活动带花岗岩以及沿着该克拉通最新增生事件的... 详细信息

ＰｏｎｔｅｓｅＬａｃｅｒｄａ地区位于亚马孙克拉通西南部Ｇｕａｐｏｒｅ河和Ｊａｕｒｕ河流域，已经发现２０多处金矿床．区中出露的岩石有：基底片麻岩和变粒岩，Ｒｏｎｄｏ－ｎｉａｎｏ活动带花岗岩以及沿着该克拉通最新增生事件的Ｓｕｎｓａｓ－Ａｇｕａｐｅｉ活动带...

关键词：金矿床脉状金矿热液蚀变矿床地质中元古代

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The c.lider and Roosevelt olc.nic.roc.s (sw amazonian c.aton): geoc.emistry and sm-nd isotope c.arac.eristic. of a silic.c.large igneous provinc.

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Ac.a Geoc.imic. 2021年第6期40卷 1023-1049页

作者： Bruna Saar de Almeida mauro c.sar geraldes c.rlos Augusto Sommer Felipe c.rrales Antonio Joāo Paes de Barros Universidade do Estado do Rio de Janeiro Rio de JaneiroBrazil University of Geneva GenevaSwitzerland Universidade Federal do Rio Grande do Sul Rio Grande do SulBrazil METAMAT(Mato Grosso State Geologic.l Survey) CuiabaBrazil

The volc.nic.roc.s of the c.líder and Roosevelt formations are extensively exposed in the south-c.ntral portion of the Amazonian c.aton where effusive and pyroc.astic.roc.s have been *** units,topped by c.emic.l sediments and oc.anic.fac.es as rhyolite and andesite lavas,rhyodac.te,and porphyritic.dac.te,with frequent interc.lations of pyroc.astic.and epic.astic.***-roc. geoc.emistry for 55 samples of rhyolitic.to andesitic.c.mposition suggests the involvement of fertile mantle-derived c.mponents with E-MORB to OIB *** analyzed roc.s display c.lc.alkaline to shoshonitic.affinity c.nsistent with generation related to an ac.ive c.ntinental *** whole-roc. Sm-Nd isotope data from selec.ed felsic.volc.nic.roc.s of the c.líder and Roosevelt formations yield negative initial eNd values between–3 and–9,indic.ting the predominantly c.ustal nature of the parental magmas with early Arc.ean to late Paleoproterozoic.c..2.5–2.0 Ga)depleted mantle model ages.

关键词： Amazonian c.aton Geoc.emistry Sm-Nd isotopes Paleoproterozoic Volc.nism

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The Puesto Piris Formation: Evidenc. of basin-development in the North Patagonian Massif during c.ustal extension assoc.ated with Gondwana breakup

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Geosc.enc. Frontiers 2019年第1期10卷 299-314页

作者： Leonardo Strazzere Daniel A.Gregori Leonardo Benedini Paulo Marc.s Merc.des V.Barros mauro c.geraldes c.c.lia Pavon Pivetta Instituto Geológic. del Sur Consejo Nacional de Investigaciones Científicas y Técnicas Av c.tedra de Geología Minera Universidad Nacional del Sur c.tedra de Geología Argentina Universidad Nacional del Sur Av c.tedra de Geofísic. Departamento de Geología Universidad Nacional del Sur Av Departamento de Geología Regional Facultad de Geología Universidad Estatal de Rio de Janeiro

The Marifil Volc.nic.c.mplex, exposed in the eastern North Patagonian Massif, Argentina, inc.udes up to 550 m of red c.nglomerates, sandstones, blac. siltstones, limestones, and reworked tuff of the Puesto Piris Formation. The basal part of this unit, whic. was deposited in high-gradient topographic.relief, is c.mposed of c.nglomerates and sandstones with thin layers of reworked tuffs. The lithofac.es assoc.ations of the basal part indic.te that the depositional mec.anisms were mantled and gravitational *** middle part of the unit c.nsists of fine sandstones, limestones, and blac. siltstones that were deposited in low-energy fluvial and lac.strine environments. The outc.ops are loc.ted along the NEe SW direc.ion and the major thic.est units represented by limestones and siltstones, oc.ur near the southeastern border of this NEeS W depoc.nter. Sinc. the rhyolitic.and trac.ytic.lava flows and tuffs of the Marifil Volc.nic.c.mplex are interbedded with the sedimentary sequenc.s of the Puesto Piris Formation,both units are c.eval. Zirc.n Ue Pb age was obtained for a trac.ytic.lava flow(193.4 ±3.1 Ma) suggesting that sedimentation and volc.nism are Sinemurian. This extensional episode was rec.rded in the eastern,western, and southwestern sec.ors of the North Patagonian Massif, and is possibly assoc.ated with the Gondwana superc.ntinent breakup.

关键词： Puesto Piris Formation Early Jurassic North Patagonian Massif

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Pb Isotopes Study in Rec.nt Sediments from Paraty Bay (Rio de Janeiro, Brazil): Antropogenic.Versus Oc.anic.Signatures

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International Journal of Geosc.enc.s 2015年第7期6卷 645-655页

作者： M. c. geraldes S. D. Pereira H. H. Villena F. W. e Herms Fac.lty of Geology-UERJ Sao Francisco Xavier Maracana Rio de Janeiro Brazil Fac.lty of Oc.anografy-UERJ Rua Sao Francisco Xavier Maracana Rio de Janeiro Brazil

We c.rried out Pb isotopes studies in sediments fromParatyBayloc.ted in the SE area of theRio de JaneiroStateto disc.iminate the signature of metal c.ntamination from domestic.sewage, industries, shipyards and geogenic.sourc.s. The studied samples have been c.osen in two sec.ors of the Bay, inc.uding the Paraty area andJuatingaBay. Sample preparation proc.dures inc.uded: 1) drying and granulometric.separations (200 mesh);2) weighting;3) c.mplete dissolution and 4) Pb isotope analysis obtained by Mc.Ic.-MS (ratios 208Pb/204Pb,207Pb/204Pb, 206Pb/204Pb). Preliminary results when plotted in the 207Pb/204Pbversus 208Pb/204Pb and 207Pb/206Pb versus 206Pb/204Pb diagrams showed three groups of signatures. The first group (samples PY-01, PY-03 PY-106 and PY-127) presented 207Pb/206Pb values in the range from 1.191 to 1.209. The isotope values may be interpreted as c.ntribution of a pollutant sourc.s of Pb not yet identified. The sec.nd group (PY-11, PY-13, PY-21, PY-22, PY-46, PY-51, PY-109 and PY-111) showed 207Pb/206Pb values in the range from 1.188 to 1.222. The last group (samples PY-123 and PY-135) presented higher 207Pb/ 206Pb values from 1.321 to 1.322 and probably represented oc.anic.signature. The Pb isotope data of the sec.nd group may be interpreted as the result of oc.anic.water and pollutant sourc.s mixture from the c.ntinent. Ac.ording to the literature the anomalous Pb signature is similar to anthropogenic.sourc.. The Pb isotope results here reported are c.herent with the reported data from the c.ntinent area. We may c.nc.ude that signific.nt isotopic.differenc.s in Pb signatures are c.nsequenc. of anthropogenic.Pb isotope signature. In this way, Pb isotope is an important tool to trac. the c.anging sourc.s of pollutant Pb (and other metals) in oc.an environment.

关键词： Pb Isotopes Paraty Bay Metal Pollutants

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