painted canyon sequence of rocks: Summarize the geologic history of Painted Cany
ID: 159895 • Letter: P
Question
painted canyon sequence of rocks:
Summarize the geologic history of Painted Canyon from oldest to youngest
A. Emplacement of igneous dike
B. Desposition of mudrock as seas came in (transgression)
C. Eruption that formed ryholite
D. Desposition of limestone and formation of chert in clear water
E. Pryoclastic eruption that formed volcanic tuff
F. Uplift and erosion of metamorphic rocks
G. Desposition of sandstone as sea moves in
H. Erosion by stream to form the canyon itself
I. Metamorphism of basement rocks
J. Offset of units along a fault
K. Emplacement of granite pluton (This unit reaches 500 ft in the elevation and it crosscuts, bakes, and therefore post-dates all units below, including the tuff layer. Whether the granite post-dates the overlying rhyolite and basalt is unknown.)
L. Depsosition/formation of rocks that would later be metamorphosed to form the basement
M. Desposition of Breccia
N. Desposition of conglomerate
O. Eruption of lava flows that formed basalt
P. Formation of very coarsely chrystalline granite (called pegmatite) dikes (light-colored dikes) in metamorphic rocks
Explanation / Answer
The things (or stuff) on the bottom is the oldest, higher up is younger and on top is the youngest.
The igneous rock is older than the clasic dike of Heart Mountain fault breccia. Some of the igneous dikes at white mountain are older than the Heart mountain fault movement.
Youngest volcanic rocks came from Crater Hill, a cone that stands 600 feet above a platform of sedimentary conglomerate near the western edge of Coalpits Wash.
The oldest lavas are contemporary with or even earlier than the earliest regional faulting, most of the later lavas are poured out before the latest faulting occured.
Sugar Loaf is a historical landmark, that stands near the crest of the Hurricane Cliffs as an isolated mesa about 400 feet high bordered by steep slopes of shale of the Moenkopi formation and capped by a thick sheet of lava, a remnant of one of the oldest flows in the Southern Utah. These differ from igneous rocks by their composition and texture.
Muscovite is rare in the upper plate which is young compared to the biotite ages. Biotite ages range from 33 to 14 Ma.
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