![]() The majority of the intrusion (both exposed and buried portions) is confined within the axis of a syncline bound to the NW and SE by anticlines. The intrusion is 2.2 km long and 0.7 km wide with an average thickness of $15 m (maximum $40 m). These data clearly delineate the outline of the buried intrusion. Magnetic and 2-D resistivity surveys focused on the southwestern portion of the intrusion where it is concealed by overlying strata. Truncation of these folds at the contact with the overlying Curtis/Summerville formations indicates the folds are Middle Jurassic. Trachyte Mesa intrudes a series of northeast trending upright and open folds formed within the Jurassic Entrada Formation. ![]() In this study we combine structural and geophysical data sets to constrain the structural geology of the host lithologies and the unmodified geometry of the intrusion. Most previous studies have worked under the assumptions that Trachyte Mesa is blister shaped and intruded into flat and gently NW dipping strata. The Trachyte Mesa intrusion is one of several small satellite bodies to the larger intrusions of the Henry Mountains, Utah. The first is presently a lens-shaped body folded in a recumbent syncline, whereas the peralkaline gneiss, also affected by a train of asymmetric recumbent folds in the south, exhibits in the north a fold-like structure which is interpreted as inherited from its primary geometry, that of a ring dike pluton. Down-plunge projection of surface data and a series of regularly spaced cross-sections have been used to build 3D models of the two main bodies of orthogneiss, of calc-alkaline and peralkaline compositions respectively. These folds nucleated in irregular igneous bodies that were initially deformed during the subduction event and show east to southeast vergence. The structural analysis carried out in orthogneissic massifs of the southern part of one of these, the Malpica–Tui Unit, reveals the generation of recumbent folds and associated axial planar foliation during their exhumation. ![]() When using a search engine such as Google, Bing or Yahoo check the safe search settings where you can exclude adult content sites from your search results Īsk your internet service provider if they offer additional filters īe responsible, know what your children are doing online.The basal units of the allochthonous complexes of NW Iberia represent a fragment of the external edge of Gondwana subducted and subsequently exhumed during the Variscan collision. Use family filters of your operating systems and/or browsers Other steps you can take to protect your children are: More information about the RTA Label and compatible services can be found here. Parental tools that are compatible with the RTA label will block access to this site. We use the "Restricted To Adults" (RTA) website label to better enable parental filtering. Protect your children from adult content and block access to this site by using parental controls. PARENTS, PLEASE BE ADVISED: If you are a parent, it is your responsibility to keep any age-restricted content from being displayed to your children or wards. Furthermore, you represent and warrant that you will not allow any minor access to this site or services. This website should only be accessed if you are at least 18 years old or of legal age to view such material in your local jurisdiction, whichever is greater. You are about to enter a website that contains explicit material (pornography).
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