| 8:00 AM-6:00 PM, Colorado Convention Center: |
431. New Perspectives and an Update on Continental Accretion–Colorado Style: Island Arcs and Back Arcs of the Central Front Range
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| Primary Leader: Lisa Rae Fisher |
| Leader(s): Thomas R. Fisher |
| Field Trip Description: This is an all new update of our popular field trip held during the 2004 Denver Convention. It is a one day trip through the Central Front Range of Colorado to examine the ~1.7 Ga metamorphosed volcanic and sedimentary sequences formed during the accretion of Colorado onto the North American craton. Island arc, back-arc, and sedimentary basin fill sequences that comprise the so-called “Idaho Springs Formation” will be examined. The possible origins of and significance of the Coal Creek Quartzite an amphibolite-grade meta-sandstone and conglomerate will be discussed and presented. The trip will feature the original stops plus two new stops to further examine implications of the metamorphic sequences and textures in interpreting the paleogeology and geography of the original protolith. Implications and significance of new geochronolgy will be discussed and examined. Lastly, the trip will attempt to put the Central Front Range accretionary sequences into a more global context by comparatives with worldwide events such as accretionary events of similar age around the West African Craton. |
| Field Trip will span: 1 day |
| Sponsor(s): |