Geology and uranium deposits of the Lucero uplift, Valencia, Bernalillo, and Sandoval counties Page: 9
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CONCLUSIONS
The study of the Jurassic sedimentation in the Lucero uplift,
indicates that the source area which lay to the south remained low
and quiescent until lower Morrison time. *The Jurassic formations
either merge or pinch out in the same area, which suggests that the
margin of the basin remained relatively constant throughout Jurrassic
time.
Deposition occurred under a climate which fluctuated between
arid and semi-arid. Much of the eolian sands present are believed to
have been brought in by west winds.
The Lucero uplift is part of a large positive element discernable
on pre-Jurassic isopach maps. This positive element has remained fair-
ly constant despite varying amounts of uplift in different parts.
Other uranium deposits of major significance are unlikely in the
Lucero uplift. The two known uranium bearing horizons, the Todilto
limestone and the Morrison formation, pinch out about the middle of
the uplift area. Southeast from the south Laguna deposits the Todilto
limestone becomes argillaceous and unfavorable for uranium deposition.
However, the Morrison formation is more promising.
The basal sandstone unit of the Dakota is locally replaced by a
black carbonaceous shale which contains some anomalies but no commercial
uranium deposits.
The Paleozoic limestones along the eastern margin of the uplift
and the spring deposits common in the area have been checked with no
encouraging results.
A relationship between "structural corners" and uranium mineraliza-
tion appears to exist. Two structural corners exist in the area north-east of the Lucero uplift, one near Jemez crater, the other west of
Taos, New Mexico.
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Mirksy, Arthur & Chenoweth, William L. Geology and uranium deposits of the Lucero uplift, Valencia, Bernalillo, and Sandoval counties, report, October 27, 1952; (https://digital.library.unt.edu/ark:/67531/metadc1393202/m1/11/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.