La Josefina Au–Ag deposit (Patagonia, Argentina): A Jurassic epithermal deposit formed in a hot spring environment

Moreira, Pilar; Fernández, Raúl

doi:10.1016/j.oregeorev.2014.12.012

Cited by 15 publications

(8 citation statements)

References 57 publications

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“…Most of the kaolinite in and around veins in the Veta Norte, Central and Sinter areas, is likely to have this origin. This would explain the presence of kaolinite filling fractures as a late stage mineral in the veins; but is partially contrasting with the previously suggested supergene (weathering) origin (Moreira and Fernández, 2015;Moreira et al, 2004b). A supergene origin would probably require an acidic environment caused by high amounts of oxidized pyrite, and that should be represented by ubiquitous jarosite (Hedenquist et al, 2000), which is scarce.…”

Section: Discussioncontrasting

confidence: 73%

“…However, the geochemistry of the Chon Aike Formation indicates a continental volcanic arc signature (Pankhurst et al, 1998;), similar to subduction-related magmatic series (Sruoga et al, 2014). Several authors referred to the Deseado Massif and its epithermal deposits as produced in a back-arc setting (Echavarría et al, 2005;Giacosa et al, 2010;Moreira and Fernández, 2015;Sillitoe, 2002), implying that there was already subduction operating when the rhyolitic volcanism occurred.…”

Section: Problem Statementmentioning

confidence: 98%

“…A belt of hydrothermally altered rocks is defined by the location of the seven indicated areas. Moreira (2005) and Moreira and Fernández (2015) mentioned the presence of the La Josefina Member as host of the Flaca East and Flaca West veins in the northern part of the Veta Norte area. However, the lavas have not been detected in trenches and a borehole drilled there, and it is more likely that fragments of these lavas are only present at the surface in the form of debris covering the underlying lithology.…”

Section: Stratigraphy Of the La Josefina Districtmentioning

confidence: 99%

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Spectral prospectivity mapping of the Deseado Massif, Argentina : dechiphering the geochemistry and mineralogy of a low to intermediate sulfidation epithermal system

Palomera¹

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The completion of this thesis was possible thanks to the contributions of four organizations and many persons. The ITC Faculty of the University of Twente, Fomicruz S.E., Cerro Vanguardia S.A., and Cerro Cazador S.A. provided the infrastructure, equipment, data, and financial and logistical support necessary for this research. I sincerely thank my promoter, Prof. dr. Freek van der Meer, for his always helpful advice, his knowledgeable scientific contributions, and his confidence that I would complete my PhD. I am particularly grateful to my co-promoter, Dr. Frank van Ruitenbeek, for his guidance and continuous contributions, suggestions and meetings either in person or remote, but also for his friendship and patience. I also thank Professor Martin Hale for his help and advice during the early stages of my PhD research.

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Section: Discussioncontrasting

confidence: 73%

Section: Problem Statementmentioning

confidence: 98%

Section: Stratigraphy Of the La Josefina Districtmentioning

confidence: 99%

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Spectral prospectivity mapping of the Deseado Massif, Argentina : dechiphering the geochemistry and mineralogy of a low to intermediate sulfidation epithermal system

Palomera¹

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“…Fig, 1. Present-day configuration and structural framework of the Falkland Plateau; offshore fault network for the Falkland Plateau compiled after Richards et al (1996), Richards and Fannin (1997), Cunningham et al (1998), Galeazzi (1998), Tassone et al (2008) and Ramos et al (2017); the structure of the San Jorge and El Tranquilo basins and the Deseado Massif redrawn after Fitzgerald et al (1990), Figari et al (2015) and Moreira and Fernández (2015); main fracture and subduction zones in South America drawn after Rapela and Pankhurst (1992) Fig . 2.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A revised position for the rotated Falkland Islands microplate

Stanca

Paton

Hodgson

et al. 2019

JGS

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The early stages of transform margin formation are associated with crustal fragmentation and block rotation. The restricted size of the resultant microcontinental blocks precludes palaeogeographic reconstructions and reliable estimations of the amount of rotation they can undergo. An example considered here is the Falkland Plateau. This is located adjacent to the Agulhas-Falkland Fracture Zone/Transform and its westernmost province is the Falkland Islands microcontinent. The position of the plateau and the islands prior to Gondwana break-up remains contentious. This study integrates seismic reflection and gravity data to propose a revised position of the Falkland Islands microcontinent constrained by: (a) the presence of a mega-décollement, controlling the Gondwanide Orogen, described north of the Falkland Islands and underneath South Africa and Outeniqua Basin, and (b) the similar architecture of fault networks mapped north of the islands and in the northernmost Outeniqua Basin. This revised position requires a re-evaluation of the timing and rate of rotation of the Falkland Islands microcontinent and impacts the expected crustal architecture adjacent to the islands. Our model yields rotation rates between 5.5° and 8° Myr-1 , two potential times for rotation and predicts more unstretched crust beneath the basin east of the Falkland Islands than previous models.

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“…Hot spring‐type gold deposits are an important gold deposit type in epithermal metallogenic series, and a single deposit can have a relatively large reserve. Since the first research effort on hot spring‐type gold deposits made by White (), hot spring‐type gold deposits have attracted the long‐term attention of numerous scholars from China and other countries (Heald, Foley, & Hayba, ; Hou & Guo, ; Moreira & Fernández, ; Nelson & Giles, ; Xiao, Wang, Li, Zhou, & Zhao, ). Hot spring‐type gold deposits are those that show compelling field evidence for mineralization within the upper few hundred meters of the paleosurface (Nelson & Giles, ).…”

Section: Introductionmentioning

confidence: 99%

Geological and geochemical characteristics and prospecting potential of the Daqiao hot spring‐type gold deposit in the west Qinling Orogen

et al. 2017

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Great breakthroughs have recently been made in discovery of gold deposits in the west Qinling Orogen, which is an important component of the Central China Orogen, the most important gold metallogenic region in China, with numerous developed gold deposits. The Daqiao gold deposit is located in the west Qinling region of the Central China Orogen at the convergence of the Minxian–Dangchang–Liangdang and Zhouqu–Chengxian thrust and nappe tectonic belts. The gold orebodies exist in the silicolites occurring in a funnel shape at the lithologic unconformity between the Triassic lower limestone and argillaceous slate; ore types are dominated by siliceous breccia type, and ores are dominated by brecciated, filmy, crusty, veinlet–mesh vein, and porous structures, with silicification and kaolinization developed widely. The silicolites have δ30Si = −0.7–0.4‰ and δ18O = 12.8–17.9‰; their formation temperature calculated with an oxygen isotope thermometer is 108–182 °C. These features indicate characteristics of hot spring‐type gold deposits. The δ34S values of the pyrite (from 1.6‰ to 9.41‰ in the early period and −11.6‰ to 9.82‰ in the late period) and the lead isotope results show that the metallogenic materials were from a mixture of magmas and strata in the early period and from strata in the late period. The zircon SHRIMP U–Pb age of the granodiorite related to mineralization is 230.9 ± 1.9 Ma. A comprehensive study of the Daqiao gold deposit indicates that it is a hot spring‐type gold deposit, formed in an intracontinental orogenic environment.

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La Josefina Au–Ag deposit (Patagonia, Argentina): A Jurassic epithermal deposit formed in a hot spring environment

Cited by 15 publications

References 57 publications

Spectral prospectivity mapping of the Deseado Massif, Argentina : dechiphering the geochemistry and mineralogy of a low to intermediate sulfidation epithermal system

Spectral prospectivity mapping of the Deseado Massif, Argentina : dechiphering the geochemistry and mineralogy of a low to intermediate sulfidation epithermal system

A revised position for the rotated Falkland Islands microplate

Geological and geochemical characteristics and prospecting potential of the Daqiao hot spring‐type gold deposit in the west Qinling Orogen

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