Characterization of Arroyo Verde Epithermal Deposit:Paragenesis,Mineral Geochemistry,Geochronology and Fluid Inclusions in Lower Chon Aike Volcanism,Argentina  

作　　者：Cecilia Pavón Pivetta Leonardo Benedini Paulo Marcos Ma.Agustina Cócola Mercedes Virginia Barros Daniel Gregori Leonardo Strazzere Anderson Costa dos Santos Mauro C.Geraldes 

机构地区：[1]Instituto Geologico del Sur(INGEOSUR),Universidad Nacional del Sur(UNS)-Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET),Bahia Blanca 8000,Argentina [2]Dpto.de Geologia,Universidad Nacional del Sur(UNS),Bahia Blanca 8000,Argentina [3]Universidad Nacional de Rio Negro,Instituto de Investigacion en Paleobiologia y Geologia,General Roca 8332,Argentina [4]Universidade do Estado do Rio de Janeiro,Faculdade de Geologia,Departamento de Mineralogia e Petrologia ignea,RiodeJaneiro20559-900,Brazil [5]Geobiotec,Departamento de Geociencias,Universidade de Aveiro,Aveiro 3800-002,Portuga

出　　处：《Journal of Earth Science》2024年第1期62-84,共23页地球科学学刊（英文版）

摘　　要：Arroyo Verde epithermal deposit,in the North Patagonia region of Argentina,is located within the Lower Chon Aike volcanism and is developed between 192.6±2.5 Ma(mineralization host rock)and 189.5±2.6 Ma(overlying lava).Marifil volcanic complex is the host rock for these veins,veinlets and breccias.This particular small deposit has developed low to intermediate sulphidation characteristics,with gangue mineral textures associated with several ore minerals.Electron probe microanalysis determines electrum,silver minerals such as acanthite,and tetrahedrite,related Ag-Cu minerals like jalpaite,mckinstryite,stromeyerite,and base metals like chalcopyrite,sphalerite,galena and pyrite.Fluid inclusions in quartz of two out of five events indicate that these Low Jurassic veins were formed due to subtle boiling and dilution mechanisms and by low-salinity(3.4 wt.%to 6.7 wt.%NaCl Eq)magmatic-hydrothermal fluid at 225 to 310℃.The fluid inclusion measurements that indicate boiling(Event 3)were plotted,and based on this data,we interpret that the Arroyo Verde deposit has been eroded between 550 and 700 m.This particular character has not been previously recorded for other sectors of the eastern north Patagonian region.

关 键 词：epithermal deposit Ag minerals mineral geochemistry fluid inclusions Chon Aike geochronology 

分 类 号：P612[天文地球—矿床学]