从墨西卡利山谷二维地震剖面揭示的卡利帕特里亚变形带。古代板块边界的证据?

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Carlos Simón Reyes-Martínez , Mario González-Escobar , Juan Carlos Montalvo-Arrieta , Uwe Jenchen , Fernando Velasco-Tapia
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引用次数: 0

摘要

埋藏在墨西卡利山谷中的地质结构需要得到更好的制约。卡利帕特里亚断层是一个重要的关键,因为它可能代表了圣安德烈亚斯断层系统的一个古老分支。对墨西卡利山谷和阿尔塔沙漠以前的地震剖面和两个新的地震剖面进行了处理和解释。在地震剖面中观察到的混沌和低振幅地震异常(CLASA)揭示了卡利帕特里亚变形区,显示出与重力最大值的高度相关性。这种相关性可延伸至萨尔顿海,从而形成一个与南圣安德烈亚斯断层相连的古老板块边界。我们提出,该变形区是一个张力转换区,由于从正交断裂转变为斜向断裂,这与基于加利福尼亚湾北部模拟模型的观测结果类似。这种断裂方式的变化产生了狭窄的盆地,促进了磁异常和火成岩深井中观察到的大陆断裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Calipatria Deformation Zone revealed from 2D seismic profiles in the Mexicali Valley. Evidence of an ancient plate boundary?

The geological structures buried in the Mexicali Valley need to be better constrained. The Calipatria Fault is an essential key as it could represent an old strand of the San Andreas Fault system. Previous and two new seismic profiles in the Mexicali Valley and Altar Desert have been processed and interpreted. Chaotic and Low Amplitude Seismic Anomalies (CLASA) observed in the seismic profiles have revealed the Calipatria Deformation Zone, showing a high correlation with gravity maxima. This correlation could extend to the Salton Sea, resulting in an ancient plate boundary connected to the Southern San Andreas Fault. We propose that this deformation zone is a transtension region due to the change from an orthogonal rifting to an oblique rifting similar to the observations on analog models based on the northern Gulf of California. This change in the rifting style produced narrow basins that facilitated continental breakup observed on magnetic anomalies and deep wells penetrating igneous rocks.

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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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