COLLABORATIVE RESEARCH: Integrated Structural and Fluid- Inclusion Study of Rolling Hinges and Low-Angle Normal Faults in Metamorphic Core Complexes

合作研究：变质核杂岩中滚动铰链和低角度正断层的综合结构和流体包裹体研究

• 批准号: 9526242
• 负责人: John Bartley
• 金额: $ 4.7万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-01-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526242&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Integrated; Structural; Fluid

; R o o t E n t r y F Zp 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 Zp Zp 4 @ , - . / 0 1 2 3 4 5 6 F Microsoft Word 6.0 Document MSWordDoc Word.Document.6 ; ' A@ " Default Paragraph Font 0 5 7 - - ( $ w ! a J 2 # * 4 4 . ( # ) U k } 0 5 9526242 Bartley Controversy still surrounds the processes that form metamorphic core complexes and extensional detachment faults. Specifically, questions remain regarding the angle(s) at which detachment faults are initiated and slip, the capacity of such faults to generate significant earthquakes, the characteristics of the transition from crystal-plastic to cataclastic to brittle deformation along the faults, the extent to which the faults and their footwalls are deformed by isostatic forces induced by tectonic denudation, and the mechanics of isostatically driven deformation of large normal faults and their footwalls. To address these questions, and integrated field and fluid-inclusion study of three faults and their footwalls will be carried out: the Simplon line, central Alps, Switzerland; the Whipple detachment, California; and the Raft River detachment, Utah. Results from these areas will be compared to each other and to our previous results from the Brenner line, eastern Alps, in order to avoid site-specific results and to allow comparison between different orogenic settings. Statisti cally significant populations of orientation and kinematic data will be collected, along with oriented samples for thin section study. Microthermometric analysis of fluid inclusions along healed fractures of known orientation will permit direct constraints to be placed on the depth-temperature conditions under which specific sets of structures formed, providing a reliable context in which to interpret the orientation and kinematic data. Whole-rock chemical data on mylonites and cataclasites from Whipple Mountains minidetachment horizons will also be collected in order to assess models for the role of fluids in the initiation of cataclastic/brittle deformation and detachment faulting. ; Oh +' 0 $ H l D h R:\WWUSER\TEMPLATE\NORMAL.DOT 9526249 Felicia S u m m a r y I n f o r m a t i o n ( + Smith Felicia Smith @ h @ @ h @ Microsoft Word 6.0 2 ; e = e j j j j j j j 1 _ _ _ ~ T M 6 j j j j j ~ j j j j 9526242 Bartley Controversy still surrounds the processes that form metamorphic core complexes and extensional detachment faults. Specifically, questions remain regarding the angle(s) at which detachment faults are initiated and slip, the capacity of such faults to generate significant earthquakes, the characteristics of the transition from crystal-plastic to cataclastic to brittle deformation along the faults, the extent to which the faults and their footwalls are deformed by isostatic forces induced by tectonic denudation, and the mechanics of isostatically driven deformation of large normal faults and their footwalls. To address these questions, and integrated field and fluid-inclusion study of three faults and their footwalls will be carried out: the Simplon line, central Alps, Switzerland; the Whipple detachment, California; and the Raft River detachment, Utah. Results from these areas will be compared to each other and to our previous results from the Brenner line, eastern Alps, in order to avoid site-specific results and to allow comparison between differen

;​R o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o4 @, -。/ 0 1 2 3 4 5 6 F Microsoft Word 6.0 Document MSWordDoc。6;”A@”默认段落字体0 5 7 - - ($ w ！a J 2 # * 4变质核杂岩和伸展滑脱断裂的形成过程仍存在争议。具体来说，问题仍然存在于拆离断层形成和滑动的角度、此类断层产生重大地震的能力、沿断层从晶体塑性变形到碎裂性变形到脆性变形的特征、断层及其下盘在构造剥蚀引起的均衡力作用下变形的程度以及大型正断层及其下盘的均衡力驱动变形的机制。为了解决这些问题，将对三条断裂及其下盘进行综合野外和流体包裹体研究：瑞士阿尔卑斯山脉中部的辛普朗线；加利福尼亚的惠普尔支队；以及犹他州的木筏河支队这些地区的结果将相互比较，并与我们之前在东阿尔卑斯山布伦纳线的结果进行比较，以避免特定地点的结果，并允许在不同的造山环境之间进行比较。将收集具有统计学意义的定向和运动学数据群体，以及用于薄片研究的定向样本。沿着已知方向的愈合裂缝进行流体包裹体的显微温度分析，可以直接限制形成特定结构集的深度温度条件，为解释方向和运动学数据提供可靠的背景。还将收集惠普尔山（Whipple Mountains）小附着层位糜棱岩和碎裂岩的全岩化学数据，以评估流体在碎裂/脆性变形和滑脱断裂中起作用的模型。;Oh +' 0 $ H l D H R:\WWUSER\TEMPLATE\NORMAL。费莉西娅·S：你是我的朋友，我是你的朋友，我是你的朋友，我是你的朋友Felicia Smith @ h @ @ h @微软Word 6.0;e = e j j j j j j j j 1 _ _ _ _ ~ T M 6 j j j j变质核杂岩和伸展离断的形成过程仍有争议。具体来说，问题仍然存在于拆离断层形成和滑动的角度、此类断层产生重大地震的能力、沿断层从晶体塑性变形到碎裂性变形到脆性变形的特征、断层及其下盘在构造剥蚀引起的均衡力作用下变形的程度以及大型正断层及其下盘的均衡力驱动变形的机制。为了解决这些问题，将对三条断裂及其下盘进行综合野外和流体包裹体研究：瑞士阿尔卑斯山脉中部的辛普朗线；加利福尼亚的惠普尔支队；以及犹他州的木筏河支队这些地区的结果将相互比较，并与我们之前在阿尔卑斯山东部布伦纳线的结果进行比较，以避免特定地点的结果，并允许不同地区之间的比较