Quaternary rift flank uplift of the Peninsular Ranges in Baja and southern California by removal of mantle lithosphere
Quaternary rift flank uplift of the Peninsular Ranges in Baja and southern California by removal of mantle lithosphere
复制标题
由于地幔岩石圈的移除，巴哈和南加州半岛山脉的第四纪裂谷侧翼隆起
DOI：
10.1029/2007tc002227
复制
发表时间：
2009
期刊：
影响因子：
4.2
通讯作者：
Craig H. Jones
中科院分区：
文献类型：
--
作者：
K. Mueller;G. Kier;T. Rockwell;Craig H. Jones
美国加州南部和墨西哥下加利福尼亚北方的区域隆升被解释为弹性岩石圈弯曲的结果，主要是由加州湾和半岛山脉东部下的上地幔加热和减薄驱动的。索尔顿海槽和加州湾断层的几何形状和时间、沿着太平洋海岸线最近岩石隆起的历史以及地球物理数据限制了基于连续弹性板块卸载的岩石圈加热和减薄模型。高地形标志着北方下加利福尼亚约400公里长的裂谷肩，它模仿了沿着太平洋海岸线观察到的由海洋阶地定义的隆起模式。我们解释这表明，最近的岩石隆起发生在整个北方巴哈半岛的宽度，并从西向东增加。加州南部沿太平洋海岸线沿着海平面沉积的上新世地层没有明显地抬升到第四纪海洋阶地沉积之上。这表明，这里沿太平洋海岸沿着的岩石隆起的开始是上新世后，发生在索尔顿海槽和加州湾中新世地壳伸展之后。因此，北方下加利福尼亚半岛山脉下地幔盖的强烈加热与加州湾局限于局部海洋扩张的地壳伸展相吻合。
Regional uplift in southern California, USA, and northern Baja California, Mexico, is interpreted to result from flexure of the elastic lithosphere driven largely by heating and thinning of the upper mantle beneath the Gulf of California and eastern Peninsular Ranges. The geometry and timing of faulting in the Salton Trough and Gulf of California, the history of recent rock uplift along the Pacific coastline, and geophysical data constrain models of lithospheric heating and thinning based on unloading of a continuous elastic plate. High topography that marks the ∼400‐km‐long rift shoulder in northern Baja California mimics the pattern of uplift observed along the Pacific coastline as defined by marine terraces. We interpret this to indicate that recent rock uplift has occurred across the entire width of northern Baja Peninsula and increases from west to east. Pliocene strata deposited at sea level along the Pacific coastline in southern California have not been uplifted significantly above Quaternary marine terrace deposits. This suggests the onset of rock uplift along the Pacific coast here is post‐Pliocene and occurs after Miocene crustal extension in the Salton Trough and Gulf of California. Strong heating of the mantle lid beneath the Peninsular Ranges in northern Baja California thus coincides with crustal extension limited to localized oceanic spreading in the Gulf of California.