All rights reserved.http://www.geosociety.org/pubs/copyrt.htm#gsa,An older age limit for the complex is pro-,m). Triassic Union W,tion, east-central California: U.S. Geological Survey Bul-,the White-Inyo Range, and their relation to the calc-alka-,line Sierra Nevada batholith: Geological Society of,tism: Cambridge, Blackwell Science Inc., 21,Strain in metamorphosed volcaniclastic rocks and its,bearing on the evolution of orogenic belts: Geological So-,of continental volcanic arc rocks along part of the eastern,Sierra Nevada, California: A case for extensional tecton-,and stratigraphic development of the Middle Jurassic,magmatic arc in the Cowhole Mountains, central-eastern,C., eds., Jurassic magmatism and tectonics of the North,American Cordillera: Geological Society of America.ics of the southwestern United States [Ph.D. Busby-Spera, 1984a, 1985; Kokelaar and,posed predominantly of epiclastic strata deposited,in nonmarine environments, a combination of,characteristics uncommon in Mesozoic volcanic.complexes in the eastern Sierra (cf. predominant protoliths. Rare de-.bris flows reached this lower fan environment.The greater abundance of structureless conglom-,erate (Cms) and the coarser and more angular na-,ture of its clasts in the northern part of the south-,ern exposure and most of the northern exposure,are interpreted to reflect transition to deposition,predominantly by debris flow processes in lower.to middle fan environments in those areas.Provenance of the lower interval was predom-,inantly nonvolcanic at first, but changed abruptly,upward to predominantly volcanic as drainages,supplying the complex with sediment extended,into existing volcanic terrain and/or as new vol-,canic edifices grew within the drainages. In the Argus Range, vol-,canism began prior to intrusion of a 173 Ma plu-,ton (Fig. 3B and 7).In both areas, Cms conglomerate commonly con-,tains boulder-size clasts that on average are more,angular (subangular to locally angular) than clasts,consist of a horizon of felsic crystal tuff (Tdc?
The,basal contact of this interval is mapped at the base,of coarsely porphyritic andesite lava that extends,the full length of the exposure belt, or at the base,of a 1–2-m-thick lithic lapilli tuff that locally un-,derlies these lava flows. The Middle Jurassic volcanic rocks are best exposed in the Buckskin Range to the west, where they consist of a lower andesitic sequence (Artesia Lake volcanics) and an upper sequence of more felsic, por-phyritic rocks (Fulstone Spring volcanics).
Chet W,mun.) The area also provides an excellent record of Jurassic to Cretaceous deformation and igneous activity that characterized the middle to late Mesozoic active margin. Ordovician to Cretaceous rocks in the map area record a long geologic history during which the continental margin of the western United States gradually changed from a passive tectonic setting in the early and middle Paleozoic to an active tectonic setting in the Jurassic and Cretaceous.
One felsic dike yielded a minimum U-Pb,felsic intrusions in the upper interval of the Inyo,this dated felsic dike, then the uppermost strata of.the complex accumulated prior to ca. Ordovician to Cretaceous rocks in the map area record a long geologic history during which the continental margin of the western United States gradually changed from a passive tectonic setting in the early and middle Paleozoic to an active tectonic setting in the Jurassic and Cretaceous. In,the White Mountains, Hanson (1986) inferred that,an isolated exposure of felsic volcanic rocks in-,terbedded with marble layers as thick as 50 m are,of marine origin and represent the oldest surviving,part of that volcanic complex. 160 to.186 Ma (cf. The Cretaceous McAfee Creek Granite transected this ENE-trending thermal zonation, but exerted little effect on Ti + Al contents (and δ18O values) of Barcroft amphiboles.Study of the Soda Mountains in the northeastern Mojave Desert revealed new stratigraphic and structural features of this area. This map encompasses the southernmost part of the Inyo Mountains and vicinity, which is centered on the high plateau of Conglomerate Mesa and extends from Owens Valley on the west to the Santa Rosa Hills, Lee Flat, and the Nelson Range on the east. In contrast, Heiney Bar and the main English Peak igneous ages overlap some of the oldest and youngest components, respectively, of the Middle to Late Jurassic Wooley Creek plutonic suite. The lower few hundred meters,of the interval contain scattered 3–50-m-thick,lenses of andesite and dacite lava (Lba) and rhyo-,thin-bedded, calcareous shale, siltstone, and mi-,nor limestone (Shc) that can be traced laterally,for 12 km (Fig. Geology of the Inyo Mountains Volcanic Complex: Implications for Jurassic paleogeography of the Sierran magmatic arc in eastern California George C. Dunne . A tectonic synthesis of systematic changes in style and age of deformation; direction, amount, and rate of tectonic transport and interaction with magmatism and sedimentation is presented. 149 Ma for a,granitoid pluton that intrudes the upper part of the,Canyon, thereby suggesting a Late Jurassic,Formation, we determined a U-Pb date for a,dacite tuff collected ~30 m above the basal con-.glomerate of this formation (sample BV-D1-94,lization age of this tuff is 154 ± 7 Ma. The great lateral extent and,relatively uniform thickness of many lithosomes,suggests that topographic relief across the region,commonly was modest during this time. 222 Ma.at Saddlebag Lake (Schweickert and Lahren,1987), and >217 Ma at Mineral King (Busby-,Spera, 1988), whereas no arc-related strata older,than ca. Subangular to sub-,rounded, aphanitic lithic lapilli compose from 1%,to 10% of the tuff; these locally define dif,lithic-rich bands that may mark contacts between,different eruptive sequences or zones of conver-,thickness and near-massive nature of this unit.suggest that it was emplaced as thick ash flow(s).terpreted minimum U-Pb date of ca.
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