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Study on System of Faults in the Gulf of Mexico and Adjacent Region based on Gravity Data
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14643 Jie MA 1 , Wanyin WANG 1 , Xiangdong DU 2 , Xingang LUO 1, 3 , Wenjie CAI 2 , Min YANG 1, 3 , Dingding WANG 1
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14643 Jie MA 1 , Wanyin WANG 1 , Xiangdong DU 2 , Xingang LUO 1, 3 , Wenjie CAI 2 , Min YANG 1, 3 , Dingding WANG 1
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In the Gulf of Mexico and adjacent landmasses, faults are very complex, and their distribution is closely related to plate tectonics, ocean–land boundary, and former structure. The plane position of the faults can be identified by the maximum characteristic of the vertical derivative of the normalized vertical derivative of the total horizontal derivative (NVDR‐THDR) of the Bouguer gravity anomaly. The apparent depth of the faults is inverted by the Bouguer gravity anomaly curvature property. Based on tectonic evolutionary processes and the plane distribution and apparent depth characteristics of the faults, a complete fault system for the Gulf of Mexico and adjacent areas has been established, including 102 faults. The apparent depths of 33 first‐class faults are 16–20 km and for 69 second‐class faults are 12–16 km. The F1‐2 and F1‐3 subduction fault zones are two caused by the subduction of the Cocos Plate into the old Yucatan and Chorti landmasses; F1‐11 and F1‐12 fault zones extend westward to the coast of Guatemala and do not extend into the continent; F1‐17 and F1‐20 faults, which control the boundary of the oceanic crust, do not extend southward into the continent. The fault system, which radiates in a “fan‐shaped” structure as a whole, unfolds to the northeast. Faults of different nature and sizes are distributed in the Cocos Plate subduction zone, Continental, Gulf of Mexico, Yucatan old landmass and Caribbean Plate in NW, NNW, NS, NE and NEE directions. In the Gulf of Mexico region, the fault system is a comprehensive reflection of former tectonic movements, such as plate movement, drift of old landmasses and expansion of oceanic crusts. The first‐class faults control the plate and ocean–continental boundaries. The second‐class faults are subordinate to the first‐class faults or related to the distribution of different sedimentary layers.
中文翻译：
基于重力数据的墨西哥湾及邻近地区断层系统研究
在墨西哥湾和邻近的陆块中，断层非常复杂，其分布与板块构造，海陆边界和以前的构造密切相关。断层的平面位置可以通过布格重力异常的总水平导数（NVDR-THDR）的归一化垂直导数的垂直导数的最大特征来确定。断层的表观深度被布格重力异常曲率性质所反转。根据构造演化过程以及断层的平面分布和表观深度特征，已经建立了墨西哥湾及邻近地区的完整断层系统，包括102个断层。33个一级断裂的视在深度为16–20 km，而69个二级断裂的视在深度为12–16 km。F1-2和F 1-3俯冲断裂带是由Cocos板块俯冲到旧的尤卡坦半岛和乔尔蒂大陆块引起的两个断裂带。F 1-11和F 1-12断裂带向西延伸至危地马拉海岸，但未延伸至该大陆。F 1-17和F 1-20控制洋壳边界的断层不向南延伸到大陆。整个以“扇形”结构辐射的断层系统向东北扩展。不同性质和大小的断层分布在西北，NNW，NS，NE和NEE方向的科科斯板块俯冲带，大陆，墨西哥湾，尤卡坦旧大陆和加勒比板块。在墨西哥湾地区，断层系统全面反映了以前的构造运动，如板块运动，旧大陆块的漂移和洋壳的扩张。一流的断层控制着板块和海洋-大陆边界。第二类断裂属于第一类断裂或与不同沉积层的分布有关。
更新日期：2021-02-22
中文翻译：
基于重力数据的墨西哥湾及邻近地区断层系统研究
在墨西哥湾和邻近的陆块中，断层非常复杂，其分布与板块构造，海陆边界和以前的构造密切相关。断层的平面位置可以通过布格重力异常的总水平导数（NVDR-THDR）的归一化垂直导数的垂直导数的最大特征来确定。断层的表观深度被布格重力异常曲率性质所反转。根据构造演化过程以及断层的平面分布和表观深度特征，已经建立了墨西哥湾及邻近地区的完整断层系统，包括102个断层。33个一级断裂的视在深度为16–20 km，而69个二级断裂的视在深度为12–16 km。F1-2和F 1-3俯冲断裂带是由Cocos板块俯冲到旧的尤卡坦半岛和乔尔蒂大陆块引起的两个断裂带。F 1-11和F 1-12断裂带向西延伸至危地马拉海岸，但未延伸至该大陆。F 1-17和F 1-20控制洋壳边界的断层不向南延伸到大陆。整个以“扇形”结构辐射的断层系统向东北扩展。不同性质和大小的断层分布在西北，NNW，NS，NE和NEE方向的科科斯板块俯冲带，大陆，墨西哥湾，尤卡坦旧大陆和加勒比板块。在墨西哥湾地区，断层系统全面反映了以前的构造运动，如板块运动，旧大陆块的漂移和洋壳的扩张。一流的断层控制着板块和海洋-大陆边界。第二类断裂属于第一类断裂或与不同沉积层的分布有关。
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