Geology and uranium deposits of the Lucero uplift, Valencia, Bernalillo, and Sandoval counties Page: 6
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GEOLOGIC HISTORY
A.late Triassic uplift in west-central New Mexico and central
Arizona caused deposition of the Shinarump conglomerate and Chinle
formations and formed the Navajo highland. It is believed that re-
current vertical movement of pre-existing deep-seated faults caused
the uplift of the Navajo Highland, which is a series of blocks of
which the most eastern is the Lucero block. This hypothesis is
based largely upon the fact that isopach and structure maps of Pale-
ozoic and Mesozoic sedimentation show the area under consideration
to be continuous with a positive area in northeastern-central Arizona.
Also, the isopach contours of the positive areas are rectangular.
Movement of the various blocks was independent. This is respon-
sible for the rapid facies changes along the Jurassic outcrop rim
and the variance in conformity of contacts at different places. An
unconformity was observed at the base of the Carmel along the De-
fiance monocline which is not present in the Lucero uplift.
The Lucero block was elevated during late Triassic. The relative-
ly thin Jurassic section and the large proportion of the finer sedi-
ments suggest that this block was the least elevated of the many
comprising the highland. From late Triassic until Morrison deposition,
the Lucero bl@Gk remained low and quiescent, contributing the fine
sediments to the basin primarly during fluviatile periods. This type
of sedimentation alternated with deposition of eolian sands. Though
no gj)dy has been undertaken of cross-bed orientation, it is thought
that much of the eolian sands in the Lucero uplift were brought in by
the prevailing west winds rather than derived directly from the Luceroblock. Extreme changes in climate are represented by the Todilto lime-
stone and gypsum.
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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/m1/8/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.