Pre‐Pliocene Extension around the Gulf of California and the transfer of Baja California to the Pacific Plate
Pre‐Pliocene Extension around the Gulf of California and the transfer of Baja California to the Pacific Plate
复制标题
加利福尼亚湾周围的上新世前延伸以及下加利福尼亚州向太平洋板块的转移
DOI：
10.1029/tc008i001p00099
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发表时间：
1989
期刊：
影响因子：
4.2
通讯作者：
K. Hodges
中科院分区：
文献类型：
--
作者：
J. Stock;K. Hodges
中新世晚期（12-5 Ma）围绕加利福尼亚湾边缘的延伸也被归因于“盆地和山脉”延伸、弧后延伸或太平洋-北美板块边界的发展。该延伸是 ENE 导向的，其结构风格与 Basin and Range 省的延伸相似。时间限制使得这种变形在从最北下加利福尼亚州最北端延伸到海湾口的南海带中几乎同步发生。这种伸展断层从上新世持续至今，与加利福尼亚湾现代转换板块边界上的运动同步，无法解决伸展方向的变化。修正后的对太平洋-北美板块运动的限制支持了中新世晚期延伸作为太平洋-北美位移的一个组成部分的发展，而沿着下加利福尼亚半岛以西现有板块边界的走滑位移无法容纳这种位移。这种情况意味着下加利福尼亚州从北美板块向太平洋板块的转移是一个渐进的过程，大约开始于12-10 Ma，当时太平洋板块相对于北美的运动在下加利福尼亚州两侧被划分为不同的走滑和倾滑位移区域。
Late Miocene (12–5 Ma) extension around the edges of the Gulf of California has been alternatively attributed to “Basin and Range” extension, back arc extension, or development of the Pacific-North America plate boundary. This extension was ENE directed and similar in structural style to extension in the Basin and Range province. Timing constraints permit nearly synchronous onset of this deformation in a belt extending SSE from northernmost Baja California to the mouth of the gulf. Where this extensional faulting continued through Pliocene time to the present, synchronous with motion on the modern transform plate boundary in the Gulf of California, no change in direction of extension can be resolved. Revised constraints on Pacific-North America plate motion support the development of this late Miocene extension as a component of Pacific-North America displacement that could not be accommodated by strike-slip displacement along the existing plate boundary west of the Baja California peninsula. This scenario implies that transfer of Baja California from the North America plate to the Pacific plate was a gradual process, beginning about 12–10 Ma, when motion of the Pacific plate relative to North America was partitioned into separate regimes of strike-slip and dip-slip displacement on opposite sides of Baja California.