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Pink, C.L., 2010

Structural controls on gold mineralization at the Rock Creek deposit, Nome, Alaska : implications for middle Cretaceous lode emplacement on the southwest Seward Peninsula

Bibliographic Reference

Pink, C.L., 2010, Structural controls on gold mineralization at the Rock Creek deposit, Nome, Alaska : implications for middle Cretaceous lode emplacement on the southwest Seward Peninsula: Pocatello, Idaho, Idaho State University, M.S. thesis, xi, 216 p., (color ) illust.

Abstract

Gold mineralization at the Rock Creek deposit near Nome, Alaska, is hosted by ~110 Ma mesothermal, low-sulfide, quartz-carbonate veins infilling extension fractures and brittle shear zones. Three quartz-dominated vein sets are associated with gold mineralization. Sub-horizontal veins define an early, volumetrically minor set. Vertical, northeast-striking extension veins define a dominant sheeted complex. These veins strike parallel to the trend of striations on coeval low-angle faults, evidence that the veins formed during local northeast-southwest contraction. Late-stage extension veins strike ENE to east and appear coincident with emplacement of vertical northeast-striking shear veins associated with the Albion Shear Zone, a 50-m-wide fault zone with dextral slip. A series of post-mineralization, northwest-striking normal faults down-drop the Rock Creek deposit to the northeast.

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