Lowrider: The Where, When, and How of Continental Crustal Underplating
Lowrider:大陆地壳底侵的地点、时间和方式
基本信息
- 批准号:1053291
- 负责人:
- 金额:$ 9.03万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2011
- 资助国家:美国
- 起止时间:2011-06-01 至 2015-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Technical description:This project uses continent-wide mapping of a lower crustal layer with high seismic velocity (termed "7.x layer" based on P velocities greater than 7.0 km/s) to answer fundamental questions about the growth of continental crust: 1. Is mafic underplating more common in Proterozoic than stable Archean crust, as previously postulated? 2. Is it associated with rifting and plume tracks? 3. Does magmatic differentiation within the crust generate a mafic lower crust? 4. Does underplating occur during continental collision? The combination of receiver function mapping of a 'double Moho' across the Transportable Array, joint inversions of receiver functions and ambient noise surface waves, previously collected refraction data, lower crustal xenoliths, and spatial and temporal relationships of 7.x layer extent to tectonic provinces is used to map the 7.x layer across the continental U.S. and relate its presence to the time sequence of continental assembly and subsequent tectonic processes.Nontechnical explanation / broader significance:The assembly and growth of the North American continental crust is a sequence of episodes of collisions between continental blocks, crustal thickening and extension, and widespread melting. Continental crust is usually composed of material that has much slower seismic wavespeeds (i.e., the velocity with which earthquake waves travel through the material) than the underlying mantle. However, several of the continent-building processes lead to the formation of a lower crustal layer with higher seismic velocities that lie in between typical mantle and crustal values. This project maps the geographic extent of this high-velocity lower crustal layer using seismic data from the continent-wide EarthScope Transportable Array. The extent of the layer relative to geological provinces mapped on the surface and known areas of continental collision, breakup, and crustal melting provides information on the timing and mechanism of emplacement of the layer. Additional information comes from lower crustal rocks that were transported to the surface during volcanic eruptions and from seismic explosion data that were recorded in the past. EarthScope offers the first opportunity to collate all these data across the entire width of a continent in order to answer fundamental questions about how continental crust is built.
技术说明:该项目利用全大陆范围的高地震速度下地壳层(根据P波速度大于7.0公里/秒,称为“7.x层”)绘图,以回答有关大陆地壳生长的基本问题:是否如先前假设的那样,基性底侵作用在元古代比稳定的太古代地壳更常见?2.它是否与裂谷和地幔柱轨迹有关?3.地壳内岩浆分异作用是否产生镁铁质下地壳?4.大陆碰撞时会发生底侵作用吗?综合利用可移动阵列上的“双莫霍面”的接收函数映射、接收函数和环境噪声面波的联合反演、先前收集的折射数据、下地壳捕虏体,7.x层范围与构造省的空间和时间关系用于绘制横跨美国大陆的7.x层,并将其存在与大陆组装的时间序列联系起来,非技术性解释/更广泛的意义:北美大陆地壳的组装和生长是大陆块体之间碰撞、地壳增厚和伸展以及广泛熔融的一系列事件。大陆地壳通常由具有慢得多的地震波速度的材料组成(即,地震波穿过物质的速度)比下面的地幔更快。然而,几个大陆建设过程导致形成一个较低的地壳层,具有较高的地震速度,位于典型的地幔和地壳值之间。该项目利用来自全大陆EarthScope移动式阵列的地震数据绘制这一高速下地壳层的地理范围。该层相对于地表上绘制的地质区和已知大陆碰撞、断裂和地壳熔融区的范围,提供了关于该层就位时间和机制的信息。更多的信息来自火山爆发时被运送到地表的下地壳岩石和过去记录的地震爆炸数据。EarthScope提供了第一次整理整个大陆宽度的所有这些数据的机会,以回答有关大陆地壳如何形成的基本问题。
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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Vera Schulte-Pelkum其他文献
Draining Nevada
排干内华达州
- DOI:
10.1038/ngeo532 - 发表时间:
2009-06-01 - 期刊:
- 影响因子:16.100
- 作者:
Vera Schulte-Pelkum - 通讯作者:
Vera Schulte-Pelkum
Vera Schulte-Pelkum的其他文献
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{{ truncateString('Vera Schulte-Pelkum', 18)}}的其他基金
Volcanic transcrustal magmatic systems imaged with teleseismic converted phases
使用远震转换相位成像的火山穿地壳岩浆系统
- 批准号:
2051243 - 财政年份:2021
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
Collaborative research: Implementation of Tensor Visualization guide (TVguide), an interactive visualization, analysis, and database tool for seismic anisotropy
合作研究:张量可视化指南(TVguide)的实施,这是一种用于地震各向异性的交互式可视化、分析和数据库工具
- 批准号:
1947765 - 财政年份:2020
- 资助金额:
$ 9.03万 - 项目类别:
Continuing Grant
Collaborative Research: Structure and depth extent of lithospheric shear zones surrounding continental transform faults
合作研究:大陆转换断层周围岩石圈剪切带的结构和深度范围
- 批准号:
1927246 - 财政年份:2019
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
Building a continent: Integration of surface geology, rock physics, and seismic observations to investigate the tectonic history of the contiguous United States
构建大陆:整合地表地质学、岩石物理学和地震观测来研究美国本土的构造历史
- 批准号:
1735890 - 财政年份:2017
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
Collaborative research: A joint seismic and geodetic investigation into the structure and behavior of an intracontinental subduction zone, Nepal
合作研究:对尼泊尔大陆内俯冲带的结构和行为进行联合地震和大地测量调查
- 批准号:
1645009 - 财政年份:2017
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
The role of hot crust in mountain building: Testing the alpha-beta quartz transition as a crustal geothermometer
热地壳在造山中的作用:作为地壳地温计测试 α-β 石英转变
- 批准号:
1344582 - 财政年份:2014
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
Is continental collision thick- or thin-skinned? Combining local seismicity with receiver functions in the Zagros Fold-and-Thrust Belt
大陆碰撞是厚脸皮还是薄脸皮?
- 批准号:
1246287 - 财政年份:2013
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
Crustal Deformation across the U.S. from Harmonic Analysis of Receiver Functions
通过接收函数的谐波分析得出美国各地的地壳变形
- 批准号:
1251193 - 财政年份:2013
- 资助金额:
$ 9.03万 - 项目类别:
Continuing Grant
Collaborative Research: Dynamics of the Southern Rocky Mountains from Cross-term Estimates of the Seismic Green Tensor
合作研究:根据地震绿色张量的跨期估计来了解落基山脉南部的动力学
- 批准号:
1142008 - 财政年份:2012
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
Collaborative Research: High-resolution receiver function imaging of crustal structure in the Southern Great Basin, Nevada
合作研究:内华达州南部大盆地地壳结构的高分辨率接收函数成像
- 批准号:
0838509 - 财政年份:2009
- 资助金额:
$ 9.03万 - 项目类别:
Standard Grant
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