Mount Morrison Roof Pendant Geology

Pelitic rocks in the mount morrison pendant some distance from any pluton contain biotite muscovite quartz k feldspar and andalusite or cordierite the mineral composition yielding maximum pressures of 2 0 2 2 kbar at temperatures of 600 615 c data of j.

Mount morrison roof pendant geology.

These rocks developed along the passive western continental margin of north america during the middle devonian. Type area is along john muir trail between mount morrison roof pendant and wheeler crest and pine creek septa on east and potter pass septum on west sierra nevada ca bateman 1992. In the mount morrison pendant structures produced during the morrison orogeny apparently were later refolded twice prior to sinistral displacement on the laurel convict fault which cross cuts. Biostratigraphy of upper paleozoic rocks in the mount morrison roof pendant sierra nevada california.

The mount diablo ophiolite contra costa county california. Sorensen 1988 personal commun. The mount morrison roof pendant the only roof pendant in the central sierra nevada containing paleozoic fossils is complexly deformed and contains three generations of structures including folds reverse faults schistosities and lineations. Late cretaceous type section locality area and or origin of name.

Granitoid plutons underlying the volcanic field have given 87 sr 86 sr values ranging from 0 70666 to 0 70987 and many other sierran plutons nearby range from 0 707 to 0 715 goff et al 1991. These rocks developed along the passive western continental margin of north america during the middle devonian. Mount morrison consists of a roof pendant that underlies an area of 62 km 2 24 sq mi. Evidence for its original paleogeographic position.

The metamorphic rock composing the mount morrison roof pendant block is the relict of a paleozoic sedimentary sequence overprinted by several deformation events which left the rocks isolated atop the sierra nevada batholith. The metamorphic rock composing the mount morrison roof pendant block is the relict of a paleozoic sedimentary sequence overprinted by several deformation events which left the rocks isolated atop the sierra nevada batholith.