Just below the Clifton Canyon fault north of Davis Basin in section 18, T14S, R38E, extrabasinal conglomerate and diamictite of the Scout Mountain Member lie above a locally scoured unconformity on volcaniclastic rocks of the Bannock Volcanic Member agglomerate facies of Link, Fig. The Neoproterozoic population ranges in age from to Ma Fig.
Rounded epiclastic trachyte and basalt lithic clasts are also present. Up to 25 m of medium- to thick-bedded trough cross-bedded sandstones are locally present within this diamictite.
High- to moderate-angle faults associated with Basin and Range extension include the E-dipping Oxford Basin fault and the range-bounding Dayton-Oxford fault Figs. It was suggested by Hoffman and Li that the time constraints for the Gaskiers glaciation are too brief for a global glaciation. The Oxford Mountain tuffite itself is interpreted as a marine volcaniclastic deposit that was proximal to medial to its volcanic source, and redeposited by sediment gravity flows. Outcrops of the Pocatello Formation contain at the base at least m of pillow basalt Fig.
This name has been applied worldwide, and current age constraints on the glaciation suggest it was diachronous between ca. Sample 19JK10 yielded two ca. The Paris-Willard thrust sheet of southeast Idaho contains the m-think Pocatello Formation overlain by a m-thick package of westward-thickening quartzose strata, the Brigham Group Crittenden et al. Bannock Volcanic Member metabasalt has an upper gradational contact with over m of Scout Mountain Member that includes extrabasinal and volcaniclastic diamictite, in turn overlain by a volcaniclastic unit the Oxford Mountain tuffite.
The ablated material was carried in helium into the plasma source of a Nu HR ICP-MS, which was equipped with a flight tube of sufficient width that U, Th, and Pb isotopes could be measured simultaneously. Therefore, the youngest single-grain SHRIMP analyses are also only tentatively mentioned to call attention to the apparent younging-upward analyses. DR1 and DR3 [see footnote 1 ]. The remaining clasts are dominantly argillite with quartzite and sparse basement lithologies.
This Ma age from rift-related rocks that underlie the Brigham Group passive-margin succession provides a maximum age for onset of rift subsidence. The poorly sorted rock contains abundant subangular, light-colored, aphanitic clasts with carbonate-chlorite alteration on rims.
Posted by: Daigami | on October 2, 2012
Carney and Janecke interpreted that, during WSW-directed slip on the Bannock detachment system, removal of lithostatic overburden caused isostatic folding, leading to the present Oxford Ridge anticline ORA; Figs. This sample yielded zircons ranging from to Ma Fig. The correlative formation of Perry Canyon in northern Utah Crittenden et al.
Analysis of this sample yielded ages of and Ma, as well as a Mesoproterozoic grain. It was suggested by Hoffman and Li that the time constraints for the Gaskiers glaciation are too brief for a global glaciation. Up to 25 m of medium- to thick-bedded trough cross-bedded sandstones are locally present within this diamictite.
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