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- W61236910 abstract "Gold-quartz veins and alteration of the Mother Lode gold belt south of Placerville are hosted by the Melones fault zone (MFZ) in the south and by its splays in the north. The MFZ changes from south to north in the following manner: ductilely deformed serpentinite-hosted tectonic melange to a broad zone of ductile shearing to a 1 km wide mylonite-phyllonite zone. These strata have common protoliths but differ in metamorphic rank, structural style, gold deposit morphology and production, which can be explained by: 1) greatest uplift of the Sierran block in the south during Basin and Range tilting, 2) irregular shape of the Jura-Triassic convergent margin of western North America coupled with oblique convergence, 3) vertical and lateral variations in age, metamorphic rank and structural style typical of an active arc and basin which is forming while closing, 4) composition and volume of diagenetic, burial and later dynamic metamorphic fluids, 5) rheology and composition of different lithologies. The Mother Lode vein system formed as the MFZ locked up. The ore-forming fluids rose km's up the MFZ to form the vein system during repeated late-stage brittle faulting. As accretion ground to a halt in the MFZ, the accretion shifted west tomore » emplace the Franciscan complex.« less" @default.
- W61236910 created "2016-06-24" @default.
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- W61236910 date "1985-01-01" @default.
- W61236910 modified "2023-09-24" @default.
- W61236910 title "Tectonostratigraphic setting of the Mother Lode gold belt, south of Placerville, California" @default.
- W61236910 hasPublicationYear "1985" @default.
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