Parent Layer: Basement Structures (Sims 2005)

Name: Structure Type

Display Field: TypeII

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: Structures within crystalline basement rocks are interpreted primarily from geophysical data combined with generally less abundant geologic data that includes borehole data and interpretations of geologic data. Linear features and discontinuities in aeromagnetic data are generally interpreted to represent structures (faults, shear zones) that have offset and juxtaposed rocks with contrasting magnetic properties (Sims et al., 2008). These features largely formed during major tectonic episodes that took place during the Archean and Proterozoic Eons with episodic reactivation into the late Proterozoic (Sims et al., 2008).

Copyright Text: Sims et al. (2005), USGS, LANL

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XMin: -1.4214278994961174E7
YMin: 3024875.140991197
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Spatial Reference: 102100  (3857)

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• Value: solid
  Label: High-angle fault, based on geologic data
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  Label: High-angle fault, based on magnetic data
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• Value: duct
  Label: Ductile shear zone
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• Value: rift
  Label: Boundary of major rift zone
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