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Linkages of Laramide Thrusts, Northern Sangre de Cristo Range, Colorado

机译:科罗拉多州Sangre de Cristo山脉北部拉拉米德推力的联系

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摘要

Laramide thrust belts in the Colorado Rocky Mountains have been mapped as discrete units with little investigation into the linkage between displacements. The Elk Range-Sawatch and Elkhorn thrust systems displaced Precambrian, Paleozoic, and Mesozoic rocks toward the southwest. The Sangre de Cristo Range and Wet Mountains thrust systems displaced rocks toward the northeast. The opposite vergence and oppositely directed displacements between these systems must be accommodated, both at present levels of exposure and at depth. Mapping of the Kerber Creek area west of the northern Sangre de Cristo Range by J.M. Bedford helped answer the question of the linkage between the opposing Elk Range-Sawatch and Sangre de Cristo Range thrusts. In the Elk Range-Sawatch system the westward displacement on the thrusts is interpreted as a minimum of 11 km in the southern Elk Range with displacement decreasing toward the north. Bryant (1966) interpreted the timing of faulting as Paleocene in age. In the Sangre de Cristo Range northeast-verging thrust system the minimum estimated eastward displacement is 8 km. Burbank and Goddard (1937) interpreted the displacement as Eocene in age. The timing of the faulting in the two areas is not necessarily different. The Kerber Creek area lies between the two regions of oppositely facing displacement. Its internal structure most closely resembles that of the more proximal Sangre de Cristo deformation. Thrusts in the Kerber Creek area place Precambrian rocks over Laramide(?) and Paleozoic sedimentary rocks. The structures verge toward the north-northeast and represent a minimum of several kilometers of displacement. These Laramide structures are exposed where overlying Tertiary volcanics are eroded. In the Northern Sangre de Cristo Range a set of E-W trending faults intersects the generally N-S trending Laramide thrusts, possibly representing a partitioning of northeast transport into N-S and E-W components. The E-W trending deformation can be correlated across the San Luis Valley with the thrust faults in the Kerber Creek area. Correlation of the Kerber Creek thrusts with Sangre de Cristo faults extends the northeast directed Laramide deformation 22 km northwest of the edge of the Sangre de Cristo Range. Thus the link between the oppositely verging structures must continue toward the northwest, possibly beneath the Bonanza volcanic field. Further mapping toward the southern extent of the Elk Range-Sawatch thrust system may reveal how the opposite vergence and minimum 8-10 km of displacement are accommodated.
机译:科罗拉多洛矶山脉的拉拉米德冲断带已被绘制为离散单元,很少研究位移之间的联系。 Elk Range-Sawatch和Elkhorn推力系统将西南前寒武纪,古生代和中生代岩石驱替。 Sangre de Cristo山脉和湿山冲断系统使岩石向东北移动。在当前的暴露水平和深度下,都必须适应这些系统之间相反的聚散度和相反的位移。 J.M. Bedford对北部Sangre de Cristo山脉以西的Kerber Creek地区进行制图,有助于回答对立的Elk Range-Sawatch和Sangre de Cristo Range冲刺之间的联系问题。在Elk Range-Sawatch系统中,推力向西的位移被解释为在Elk Range的南部至少11 km,而向北的位移则减小。布莱恩特(Bryant,1966)将断层的时机解释为年龄为古新世。在Sangre de Cristo Range东北向推力系统中,估计的最小向东位移为8 km。伯班克和戈达德(Burbank and Goddard,1937年)将位移解释为始新世。这两个区域的断层时间不一定是不同的。 Kerber Creek区域位于两个面向相反位移的区域之间。其内部结构与更近的Sangre de Cristo变形最相似。 Kerber Creek地区的推力将拉姆拉德(?)上的前寒武纪岩石和古生代沉积岩放置在上面。这些结构向东北东北倾斜,并且至少位移了几公里。这些Laramide结构暴露在上层第三纪火山被侵蚀的地方。在北部的圣克里斯托山山脉中,一组E-W趋势断层与N-S趋势拉拉米德逆冲断层相交,可能代表了东北向运输划分为N-S和E-W分量。 E-W趋势变形可以在整个圣路易斯谷地与Kerber Creek地区的逆冲断层相关。 Kerber Creek逆冲断层与Sangre de Cristo断层的相关性使Sangre de Cristo山脉边缘西北22 km的东北定向拉拉酰胺变形扩展。因此,在对立的构筑物之间的连接必须继续向西北延伸,可能在Bonanza火山场之下。往Elk Range-Sawatch推力系统的南部延伸进一步绘制,可能会揭示出如何适应相反的聚散度和最小8-10 km的位移。

著录项

  • 作者

    Bedford Janice M.;

  • 作者单位
  • 年度 1994
  • 总页数
  • 原文格式 PDF
  • 正文语种 en_US
  • 中图分类

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