Timing of Deformation in the Early Mesozoic Back-Arc Basin of the Western U.S. Cordillera: Luning-Fencemaker Fold and Thrust Belt

;​R o o t E n t y F L C o m p o b j b W o r d d o c u m e n t O b j e c t P O O l y y4 @ ！# $ % &amp；’)* +,-。/ 0 1 2 3 4 5 6 7 8 9:；= ?@ A B C D E F G H J F Microsoft Word 6.0文档MSWordDoc。6;e = e o o j j j j j j j j Q 1 3 t5 Q j Q j j j j j j j与中生代弧相关的缩短是美国西部科迪勒拉的一个普遍特征，侏罗纪的缩短在科迪勒拉最西端的中生代弧组合中最为突出。白垩纪缩短在弧后以东地区最为明显。最近的研究表明，这种变化是对活动板块边缘俯冲参数（几何形状和速率）变化的响应。然而，侏罗纪和白垩纪在空间上并不完全分离，特别是在弧后西部地区重叠。本项目涉及鲁宁—菲梅克褶皱和冲断带各种变形事件的年龄定年。结果将澄清重叠变形的时间，并允许更完整地了解变化的俯冲参数如何影响变形的空间分布。0 $ H l D H R:\WWUSER\ MPLATE\NORMAL。你是我的朋友，我是你的朋友，我是你的朋友，我是你的朋友。9526129菲莉西亚·史密斯菲莉西亚·史密斯@ k @ @ k @微软Word 6.0;oo !!!K @ Normal a “ a @ ”默认段落字体o o o o o Felicia Smith-\\CLM12\EARTESHR\1995SEPT\ABSTRACT\WRIGHT.TXT @ hp LaserJet IIID LPT3：hppcl5a HP LaserJet IIID 8D R hppcl5a HP LaserJet IIID 8D R n n n n n 1 Times New Roman Symbol & & Arial " h m Em $ 5 9526129 Felicia菲利西亚·史密斯；;

; R o o t E n t r y F L C o m p O b j b W o r d D o c u m e n t O b j e c t P o o l y y 4 @ ( ! " # $ % & ' ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; = ? @ A B C D E F G H I J F Microsoft Word 6.0 Document MSWordDoc Word.Document.6 ; e = e o o j j j j j j j Q 1 3 T 5 Q j Q j j j j ~ j j j j 9526129 Wright Mesozoic arc-related shortening is a widespread feature in the western U.S. Cordillera, Jurassic shortening is most prominent within Mesozoic arc assemblages of the westernmost Cordillera, whereas Cretaceous shortening is most prominent in the back-arc region to the east. Recent work has suggested that the change is a response to changing parameters of subduction (geometry and rate) along the active plate margin. However, the Jurassic and Cretaceous episodes are not completely separated spatially, and overlap particularly in the western back-arc region. This project involves age dating of the various deformation events in the Luning-Fencemaker fold and thrust belt. Results should clarify the timing of the overlapping deformations and allow a more complete picture of how changing subduction parameters affects spatial distribution of deformation. Oh +' 0 $ H l D h R:\WWUSER\TE MPLATE\NORMAL.DOT S u m m a r y I n f o r m a t i o n ( 9526129 Felicia Smith Felicia Smith @ k @ @ k @ Microsoft Word 6.0 1 ; o o ! ! ! K @ Normal a " A@ " Default Paragraph Font o o o o Felicia Smith-\\CLM12\EARTESHR\1995SEPT\ABSTRACT\WRIGHT.TXT @HP LaserJet IIID LPT3: hppcl5a HP LaserJet IIID 8D R HP LaserJet IIID 8D R n n n n 1 Times New Roman Symbol & Arial " h m Em E $ 5 9526129 Felicia Smith Felicia Smith ; ;