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• W852845478 abstract "The Copper Basin porphyry copper deposit occurs in a m u lt ip le phase stock o f Laramide age emplaced in Precambrian w a ll rocks. In order o f emplacement, the stock includes g ra n o d io r ite -q u a rtz d io r i t e m e la d io r ite , g ra n o d io r ite -q u a rtz m onzonite, o ld e r qu artz l a t i t e porphyry, and younger qu artz l a t i t e porphyry. K-Ar d a tin g shows th a t these rocks were in trud ed from about 75 to 72 m .y. ago. B recc ia , thought to be the r e s u lt o f co llap se o f a la rg e v a p o r f i l le d chamber, forms a la rg e p a rt o f the d ep o s it. Hydrothermal a lte r a t io n and m in e ra liz a tio n zoning is recognized as rough annular zones centered on the most abundantly fra c tu re d p o rtio n o f the s tock . The a l te r a t io n zones from the cen ter o f the deposit outward are a poorly-developed core o f p h y ll ic a l te r a t io n surrounded by a potass ic zone which grades outward to a halo o f pro­ pyl i t i c a l te r a t io n . The potass ic zone is d iv ided in to secondary b io t i t e and secondary orthoc lase subzones. S u lf id e m in e ra liz a tio n zoning is ch a ra c te rized by the v a r ia b i l i t y o f p y r ite and p y r ite : c h a lc o p y rite r a t io s . The s u lf id e s occur as v e in le ts and dissem inated grains and b lebs. Both the a l te r a t io n and m in e ra liz a tio n zoning are a t tr ib u te d to convective flow o f s a lin e hydrothermal f lu id s . These f lu id s were probably a combination o f m eteoric and magmatic s o lu tio n s . The a v a ila b le f lu id in c lu s io n data suggests the f lu id s ranged between 200 and 5 0 0 ° C. The f lu id s c irc u la te d a t h yd ro s ta tic pressures o f x" @default.
• W852845478 created "2016-06-24" @default.
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• W852845478 date "1978-01-01" @default.
• W852845478 modified "2023-09-27" @default.
• W852845478 title "Geology, alteration, and mineralization of the Copper Basin porphyry copper deposit, Yavapai County, Arizona" @default.
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