Age and chemistry of tertiary volcanic rocks in north-central Arizona and relation of the rocks to the Colorado Plateaus
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Abstract
During late Miocene (14.8 m.y.) to early Pliocene (10.1 m.y.) time, local latite and widespread basaltic flows accumulated with associated continental sedimentary deposits in north-central Arizona. Some of these rocks were displaced and tilted by normal faults, and new drainage, now occupied in part by basalt flows of late Pliocene age (average 5 m.y., maximum of 6 m.y.), was established at the southern margin of the Colorado Plateaus. The time of faulting and uplift of the Colorado Plateaus in this region is thus bracketed between about 10.1 and 6 m.y. ago.
Five analyzed basalts fall within the tholeiitic basalt field of the alkali-silica diagram and twenty are in the alkalic basalt field; in general, they are similar to other alkali-olivine basalts from the western United States.
Study Area
Publication type | Article |
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Publication Subtype | Journal Article |
Title | Age and chemistry of tertiary volcanic rocks in north-central Arizona and relation of the rocks to the Colorado Plateaus |
Series title | Geological Society of America Bulletin |
DOI | 10.1130/0016-7606(1971)82[2767:AACOTV]2.0.CO;2 |
Volume | 82 |
Issue | 10 |
Year Published | 1971 |
Language | English |
Publisher | Geological Society of America |
Description | 18 p. |
First page | 2767 |
Last page | 2782 |
Country | United States |
State | Arizona |
Other Geospatial | Colorado Plateaus, Mogollon Rim |
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