Lavas Along Kingman Wash Road AZ

Описание: 36.004556, -114.711225
Another wash along the Kingman Wash Road (Dead Man Gulch).

Geology of the Boulder Dam Project (in pictures):
http://getmyrealtime.com/myfiles/Boul...

Tsmy: 10-12 Ma. Younger intermediate-age sedimentary rocks (upper and middle Miocene)—Mainly clastic strata equivalent in age to unit mapped widely in the Lake Mead area as the informal red sandstone unit (Bohannon, 1983), and in study area as lower Muddy Creek Formation (Anderson, 1978).

Tdmu: 12.5 Ma. Mafic lavas. Basalt and basaltic andesite flows that post-date upper Mount Davis rhyodacite and dacite (Tdru). Includes some outcrops of units Tmf and Tdm of Anderson (1977, 1978). Kingman Wash Road basaltic andesite (unit Tkw of Mills, 1994), which makes up bulk of unit, is exposed east of Hoover Dam and has an age of 12.57±0.03 Ma

Tdru: 13.1 Ma. Rhyodacite and dacite. Dacite and rhyodacite lava flows and domes in north part of Black Canyon. Forms prominent brown and tan cliffs, generally with pale-yellow zeolitized slope forming lower part composed of tuffaceous bedded sediments and autoclastic flow breccia.

Tiw: 13.5 Ma. Wilson Ridge pluton (middle Miocene)—Modified from Beard and others (2007). Texturally diverse, fine- to coarse-grained quartz diorite intrusion. Cut by abundant dikes, locally in dike-on-dike array, of granite, granitic porphyry, aplite, basalt, and biotite lamprophyre.

Thd: 13.9 Ma. Tuff of Hoover Dam—Gray-brown to white, poorly to moderately welded lithic ash-flow tuff. Lithic fragments include Patsy Mine Volcanics and Wilson Ridge pluton(?). Dacitic, with phenocrysts of plagioclase, biotite, and hornblende. About 180 m thick in vicinity of Hoover Dam. Thickness decreases dramatically south of Sugarloaf canyon, and tuff is interbedded with clastic and volcaniclastic deposits.

Tpl: 16-18 Ma. Lower part—Modified from Anderson (1977, 1978). Dark-purplish-gray andesite lava and breccia.

Free Updated Geologic Map of the Black Canyon Area:
https://pubs.usgs.gov/of/2013/1267/a/

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