Alternative perspectives of crustal and upper mantle phenomena along the Rio Grande rift

[摘要] At various locations alongthe Rio Grande rift in central and southern New Mexico, USA, heat flow data suggesta rather abrupt change from high values often associated with the rift to lowervalues characterizing neighboring geologic provinces. With this consideration inmind, we explore possible perspectives derived from seismic cross sections alongLa Ristra profile crossing New Mexico. In New Mexico, La Ristra transects at ~45°to the generally accepted north-south axis of the Rio Grande rift and more acutelyto potential eastern boundaries of the southern rift. Considering foreshortenedprojections of seismic cross sections, one may be able to better visualize possibleadvection associated with the Rio Grande rift, although resolution of existing seismicdata suggests the narrow, near vertical seismic anomalies in these projections maybe hypothetical interpretations. If the foreshortened cross sections are realistic,then upper-mantle upwelling appears to be focused near the Rio Grande rift–GreatPlains craton boundary.

[学科分类] 地质学

[关键词] Fire safety;fatal fires;smoke alarms