Anticline and Syncline Jemez Mountains


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Stratigraphy

  • San Ysidro

    • Anticline and Syncline
  • Jemez Mountains

    • Valle Caldera


























Structural history: 75 million years ago Laramide Orogeny

  • Structural history: 75 million years ago Laramide Orogeny



Jemez Mountain Range



Jemez Mountain Range Cont.

  • Jemez lineament is a NE trending crustal flaw that controlled volcanism and tectonism in the Jemez Mountains and the Rio Grande rift zone

  • Volcanism did not begin until after the Sante Fe rift

  • The volcanic rocks lie uncomformably on top of igneous, metamorphic, and sedimentary rocks

  • Ages range from Precambrian through late Tertiary.

  • Mesozoic sedimentary rocks form the eastward-dipping backslope of the Sierra Nacimient

  • The Valles Caldera truncated an older volcanic flow



Jemez Mountain Range Cont.

  • The western margin of the Rio Grande depression in the Jemez area is delineated by a zone of northeast-trending faults.

  • An en echelon zone is expressed by the Pajarito fault zone in the San Miguel Mts

  • North of Santa Clara Canyon,fault zone is a series of antithetic faults that displace the basalts along the eastern edge of Lobato Mesa.

  • Faults in the West generally show more normal displacement downward to the east with Right-Slip faulting

  • Faults in the East are antithetic (displacement is opposite to faults ) with Left slip faulting

  • Fun Fact: Due to such high geothermal volcanic activity, the Jemez Mountains contain several hot springs, making them a tourist Hot Spot



Jemez Mountains Cont.



Sandia Mountains



Sandia Mountains

  • Dominated by an eastward-tilted fault block

  • An unusual structure of the area is the Tijeras rift belt bounding the uplift that trending northeastwards and contains a southwestern folded graben and a northeastern horst

  • Tijeras rift belt was formed in the Laramide Orogeny

  • North-east striking, subvertical faults : Tijeras, Gutierrez, San Lazarus, Los Angeles, and Lamy faults



Sandia Mountains Cont.

  • Tijeras fault is a Left-Lateral Slip

  • Fault system links to north-striking Picuris-Pecos fault system

  • Tijeras–Cañoncito fault system is characterized bysubparallel faults,

  • Horsts and grabens are present along much of its length.





Sandia Mountains Cont.





Albuquerque Basin

  • The basin is part of an orogenic belt dominated by a rift valley system

  • To the west is the Colorado Plateau, the Sandia fault to the east, the Nacimiento uplift, into the Jemez Mts, and La Bajada scarp to the north, and the Socorro constriction to the south.

  • consists of two subbasins downdropped along low-angle to listric, normal faults of opposing structural polarity seperated by a mid-basin transverse structural zone





Lithology



Deposited by an ancient inland sea during the Cretaceous time period.

  • Deposited by an ancient inland sea during the Cretaceous time period.



Deposited during Early Cretaceous and earliest Late Cretaceous in response to a regional transgression.

  • Deposited during Early Cretaceous and earliest Late Cretaceous in response to a regional transgression.



Consists of sandstone and mudstone deposited in fluvial environments.

  • Consists of sandstone and mudstone deposited in fluvial environments.



Summerville deposition took place on a vast arid coastal plain that extended from Utah to Oklahoma (Anderson and Lucas, 1992, 1994; Lucas and Anderson, 1997).

  • Summerville deposition took place on a vast arid coastal plain that extended from Utah to Oklahoma (Anderson and Lucas, 1992, 1994; Lucas and Anderson, 1997).



Is limestone that was deposited by a saline inland sea.

  • Is limestone that was deposited by a saline inland sea.



Deposited on widespread alluvial plains of low relief.

  • Deposited on widespread alluvial plains of low relief.



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