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引言冰川国家公园位于蒙大拿北西的落基山前缘内(图1)以前的工作把注意力放在区内大型挤压和伸展构造上,并提出了这两种构造间可能的存在互相影响。本区主要的压性构造为拉腊米刘易斯逆断层(图1),断层走向NW-SE,将落基山前缘分成NE和SW两部分,其倾角15°,倾向SW,逆断层上盘的前寒武带超群被若干条平行于刘易斯断层走向的伸展断层所切割(图1)。这组伸展断层系最西边的特征表现为从蒙大拿北至不列颠哥伦比亚扩
INTRODUCTION The previous work of the Glacier National Park, located on the Rocky Mountain front in north west Montana, of Montana, focused on the large crustal compression and extension structures in the region and suggested that the possible existence of these two structures interfered with each other . The main compressional structure in this area is the Laramie Lewis reverse fault (Figure 1). The fault travels NW-SE. The leading edge of the Rocky Mount is divided into NE and SW, with a dip of 15 ° and a dip SW Precambrian superb is cut by several extensional faults parallel to the Lewis faults (Figure 1). The westernmost feature of this extension series extends from northern Montana to British Columbia