The jasperoids of the Superior district, Arizona: their origin and controls on their location

The present project involves the study of quartz-iron oxide replacement bodies (jasperoids) at the Lake Superior and Arizona (LS&A) and Queen Creek mines at Superior , Arizona. This project is based on more than 12 months of field work and extensive petrographic, major and trace element, and isotopic (O and C) data on samples of host rocks and ore. This project is part of a larger project to study the Cu-Au association in porphyry and epithermal systems: variations in time-space and geochemical evolution that involves several people of the ODEX Research Group at Stanford.

In this projext I am studying:

The small size of these bodies (generally less than 10 m long and 1 m thick) makes them ideally suited for a detailed study of the stratigraphic controls in the location of this type of ore bodies. This is important because bigger ore bodies generally replace not only the favorable beds but also their surroundings, making it difficult to establish the reasons why that part of the sequence had been replaced.

Preliminary results from my studies have been presented at meetings of the Geological Society of Nevada (GSN) and of the Geological Society of America (GSA):

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