Biostratigraphy and structural geology in the Marys Mountain area, Carlin Trend, Eureka County, Nevada.

摘要

New biostratigraphic data allows the detailed lithostratigraphy to be unraveled in upper plate rocks in the Marys Mountain area. Stratigraphic units include the upper portion of the Vinini Formation, the Elder Formation, and the Slaven Chert. Lithostratigraphic units recognized at Marys Mountain can now be correlated across a distance of over 150 km within the Roberts Mountains allochthon, from the REN property in the northern Tuscarora Mountains to Vinini Creek in the Roberts Mountains.; Structural features in these rocks include tight to isoclinal folds and imbricate thrust faults (presumably Paleozoic features related to emplacement of the Roberts Mountains allochthon) and high-angle normal faults (middle to late Cenozoic but possibly older as well). Marys Mountain can be divided into two structural domains: (1) a southwest domain defined by north-south striking steeply dipping strata with a high degree of structural imbrication, and (2) a northeast domain with northwest striking gently to moderately dipping strata and exhibiting less structural disruption. (Abstract shortened by UMI.)