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Featured researches published by Fj Testa.


Remote Sensing | 2018

Lithological and Hydrothermal Alteration Mapping of Epithermal, Porphyry and Tourmaline Breccia Districts in the Argentine Andes Using ASTER Imagery

Fj Testa; Cecilia Villanueva; David R. Cooke; L Zhang

The area of interest is located on the eastern flank of the Andean Cordillera, San Juan province, Argentina. The 3600 km2 area is characterized by Siluro-Devonian to Neogene sedimentary and igneous rocks and unconsolidated Quaternary sediments. Epithermal, porphyry-related, and magmatic-hydrothermal breccia-hosted ore deposits, common in this part of the Frontal Cordillera, are associated with various types of hydrothermal alteration assemblages. Kaolinite – alunite-rich argillic, quartz – illite-rich phyllic, epidote – chlorite – calcite-rich propylitic and silicic are the most common hydrothermal alteration assemblages in the study area. VNIR, SWIR and TIR ASTER data were used to characterize geological features on a portion of the Frontal Cordillera. Red-green-blue band combinations, band ratios, logical operations, mineral indices and principal component analysis were applied to successfully identify rock types and hydrothermal alteration zones in the study area. These techniques were used to enhance geological features to contrast different lithologies and zones with high concentrations of argillic, phyllic, propylitic alteration mineral assemblages and silicic altered rocks. Alteration minerals detected with portable short-wave infrared spectrometry in hand specimens confirmed the capability of ASTER to identify hydrothermal alteration assemblages. The results from field control areas confirmed the presence of those minerals in the areas classified by ASTER processing techniques and allowed mapping the same mineralogy where pixels had similar information. The current study proved ASTER processing techniques to be valuable mapping tools for geological reconnaissance of a large area of the Argentinean Frontal Cordillera, providing preliminary lithologic and hydrothermal alteration maps that are accurate as well as cost and time effective.


Lithos | 2017

Along-strike segmentation of the Abanico Basin, central Chile: new chronological, geochemical and structural constraints

J Piquer; Pete Hollings; Orlando Rivera; David R. Cooke; Mj Baker; Fj Testa


Minerals | 2016

Bismoclite (BiOCl) in the San Francisco de los Andes Bi–Cu–Au Deposit, Argentina. First Occurrence of a Bismuth Oxychloride in a Magmatic–Hydrothermal Breccia Pipe and Its Usefulness as an Indicator Phase in Mineral Exploration

Fj Testa; David R. Cooke; L Zhang; Graciela Mas


Minerals | 2018

Physicochemical Conditions of Formation for Bismuth Mineralization Hosted in a Magmatic-Hydrothermal Breccia Complex: An Example from the Argentine Andes

Fj Testa; L Zhang; David R. Cooke


Archive | 2014

Executive summary AMIRA project P1060: enhanced geochemical targeting in magmatic-hydrothermal systems

Cooke; Jb Gemmell; Jamie J. Wilkinson; Pete Hollings; Mj Baker; L Zhang; N Fox; Noel C. White; Huayong Chen; A Pacey; J Piquer; C Jimenez; Fj Testa; A Baig; W Lueck; E Smyk; J Thompson; E Lounejeva; Cc Wilkinson; M Bertini; Et Spencer


Archive | 2014

Enhanced geochemical targeting in magmatic-hydrothermal systems

Jb Gemmell; Cooke; Jamie J. Wilkinson; Pete Hollings; Mj Baker; L Zhang; N Fox; Noel C. White; Huayong Chen; A Pacey; J Piquer; C Jimenez; Fj Testa; A Baig; W Lueck; E Smyk; J Thompson; E Lounejeva; Cc Wilkinson; M Bertini; Et Spencer


Archive | 2014

Tourmaline cemented breccia: San Francisco de los Andes, Argentina Rio Blanco-Los Bronces, Chile

Fj Testa; Cooke; N Fox; L Zhang; Mj Baker; C Jimenez; Cc Wilkinson; J Piquer; E Lounejeva


Archive | 2014

P1060 - achievements and explorers' toolbox

Jb Gemmell; Cooke; Jamie J. Wilkinson; Pete Hollings; Mj Baker; L Zhang; N Fox; Noel C. White; Huayong Chen; A Pacey; J Piquer; C Jimenez; Fj Testa; A Baig; W Lueck; E Smyk; J Thompson; E Lounejeva; Cc Wilkinson; M Bertini; Et Spencer


Archive | 2014

Whole rock geochemistry - lessons learned from exploration

Pete Hollings; Cooke; Mj Baker; J Piquer; Jamie J. Wilkinson; Noel C. White; L Zhang; N Fox; Huayong Chen; A Pacey; C Jimenez; Fj Testa; A Baig; W Lueck; E Smyk


Archive | 2014

La Americana Cu-Mo deposit, Chile

Fj Testa; Cooke; N Fox; Mj Baker; J Piquer

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L Zhang

University of Tasmania

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Mj Baker

University of Tasmania

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Cooke

University of Tasmania

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N Fox

University of Tasmania

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J Piquer

University of Tasmania

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Cc Wilkinson

American Museum of Natural History

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E Lounejeva

National Autonomous University of Mexico

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