Sedimentary Basin Development & Deformation Adjacent to the Mojave-Sonora Megashear, Sonora, Mexico: Evaluation of the Mid-Mesozoic Tectonics of the Southwestern Cordilleran Margin
沉积盆地发育
基本信息
- 批准号:0229565
- 负责人:
- 金额:$ 20.49万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2003
- 资助国家:美国
- 起止时间:2003-02-01 至 2006-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The identification of ancient continental transform margins has proven difficultfor a variety of reasons. Transform faults are commonly reactivated subsequent to theiractive transcurrent displacement histories by younger tectonic processes. In addition,piercing points that permit assessment of offset are commonly equivocal and subject tomultiple interpretations. However, analysis of sedimentary basins developed adjacent totransform faults, particularly faults that transect marginal continental lithosphere,provides a powerful tool for evaluation of ancient transform margins. Evaluation of thetiming of deposition and deformation is especially critical, because the two processesshould be partly coeval in strike-slip basins. In northern Sonora, the postulated Mesozoictype example of a continental transform, the Mojave-Sonora megashear, juxtaposes acontinental crustal fragment, the Caborca block, against cratonal North America alongwhat is now a complex structural zone. A narrow, deformed sedimentary basin of LateJurassic-Early Cretaceous age lies along this structural boundary for a distance of morethan 300 km. The subsidence history of the basin largely coincided with the positeddisplacement history of the megashear and so provides a unique opportunity to evaluatethe megashear hypothesis and understand the processes that constructed the LateJurassic-Early Cretaceous Cordilleran continental margin.A two-year field- and laboratory-based study proposed here will determine thedepositional and structural evolution of the sedimentary basin adjacent to the megashearand the uplift history of the Caborca block, which forms the present southern edge of thebasin. The objectives of the research fall into three major categories:1. Basin origin and its Mesozoic proximity to the Caborca block.Lithostratigraphic, biostratigraphic, and geochronologic analysis will determine thelifespan and geometry of the basin, while provenance studies will determine if theCaborca block was a sediment source for the basin. Fossils in the strata and interbeddedvolcaniclastic rocks make this objective practicable.2. Deformation kinematics and chronology of the basin. Strata in the basin arelocally tightly folded, cleaved, and metamorphosed. However, deformation intensity isgreater in older rocks than in younger ones, a variation which may be either temporal orrelated to burial depth of strata during deformation. Mesoscale and microscale structuralanalysis will evaluate kinematics and variability of deformation both stratigraphically andgeographically with respect to the megashear. 40 Ar/ 39 Ar geochronology onmetamorphosed pelites will determine the age of the deformation in the basin.3. Time of uplift of Caborca block. The age of uplift of the basin margin will bedetermined from stratigraphic relations and 40 Ar/ 39 Ar thermochronology in order toestablish time of uplift of the outboard block relative to deformation of the basin. Theuplift analysis will also permit evaluation of provenance results.This integrated sedimentologic, structural and geochronologic study will evaluatethe transform processes that are inferred to have created the southwestern Cordilleranmargin beginning in the Late Jurassic. If the megashear hypothesis remains tenable, thisstudy should serve as a template for other analyses of ancient continental transformmargins. If the megashear hypothesis is refuted, the study will force re-evaluation of theMesozoic tectonics of the southwestern Cordilleran margin and the kinematics ofPangean supercontinent break up in Mexico.
由于各种原因,古大陆转换边缘的识别已被证明是困难的。转换断层通常在其活动的横流位移历史之后被年轻的构造作用重新激活。此外,允许评估偏移的穿刺点通常是模棱两可的,并受到多重解释的影响。然而,对与转换断层相邻发育的沉积盆地的分析,特别是对横切大陆边缘岩石圈的断层的分析,为评价古代转换边缘提供了强有力的工具。对沉积和变形时间的评估尤其关键,因为在走滑盆地中,这两个过程应该部分相同。在索诺拉北部,假设的大陆转换的中间孢子型例子,莫哈韦-索诺拉巨型,与北美克拉通板块并列在一起,现在是一个复杂的构造带。一个狭窄的、变形的晚侏罗世-早白垩世沉积盆地位于这一构造界线上,距离超过300公里。盆地的沉降史在很大程度上与大地震的定位位移历史相吻合,因此为评估大地震假说和了解构造侏罗纪晚期-早白垩世科迪勒大陆边缘的过程提供了独特的机会。这里提出的一项为期两年的野外和实验室研究将确定大地震附近沉积盆地的沉积和构造演化以及形成现今盆地南缘的卡博卡地块的隆升历史。这项研究的目标分为三大类:1.盆地成因及其中生代与科博卡地块的接近。岩石地层学、生物地层学和地质年代学分析将确定盆地的寿命和几何形状,而物源研究将确定科博卡地块是否是盆地的沉积物来源。地层和互层火山碎屑岩中的化石使这一目标具有可行性。盆地的变形运动学和年代学。盆地中的地层局部紧密褶皱、解理和变质。然而,老岩石的变形强度比新岩石大,这种变化可能是暂时的,也可能与变形过程中地层的埋藏深度有关。中尺度和微观尺度的结构分析将评估相对于大切变的地层和地理变形的运动学和可变性。变质泥质岩的40Ar/39Ar年代学将确定盆地变形的年龄。科博尔卡地块的抬升时间。将根据地层关系和40Ar/39Ar热年代学确定盆地边缘的隆升年龄,以确定外缘地块相对于盆地形变的隆升时间。这项综合的沉积学、构造学和地质年代学研究将评估被推断为从晚侏罗世开始形成西南科迪勒边缘的转换过程。如果大地震假说仍然站得住脚,这项研究应该成为其他分析古代大陆转换边缘的模板。如果大地震假说被推翻,这项研究将迫使人们重新评估科迪勒西南边缘的中生代构造和盘古超大陆在墨西哥解体的运动学。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Timothy Lawton其他文献
Timothy Lawton的其他文献
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{{ truncateString('Timothy Lawton', 18)}}的其他基金
Tectonic Inversion of Early Cretaceous Bisbee Basin as a primary control of Laramide Structural Style and Trends, Southeastern Arizona and Southwestern New Mexico
早白垩世比斯比盆地的构造反转是亚利桑那州东南部和新墨西哥州西南部拉拉米德构造风格和趋势的主要控制
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9304759 - 财政年份:1993
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$ 20.49万 - 项目类别:
Standard Grant
Thrusting Sequence in Central Utah Foreland From Deformationof Syntectonic Basin - Margin Conglomerates
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9205411 - 财政年份:1992
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$ 20.49万 - 项目类别:
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Collaborative Research: Magnetostratigraphy, Depositional Patterns and Temporal Evolution of Piggyback Basin, Sevier Orogenic Belt, Central Utah
合作研究:犹他州中部塞维尔造山带驮式盆地的磁性地层学、沉积模式和时间演化
- 批准号:
8904835 - 财政年份:1989
- 资助金额:
$ 20.49万 - 项目类别:
Standard Grant
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