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 |
|---|---|
| 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 |
| Google Analytic Metrics | Metrics page |