Age, Origin, and Tectonic Significance of Mesozoic Rocks in the Magdalena-Margarita Region, SW Baja California Sur, Mexico

洋壳吸积地体边缘平行平移的作用目前在挤压造山带中很受关注。这是对墨西哥南下加利福尼亚州附近岛屿上变形和变质的海洋岩石进行的跨学科调查。这些岛屿包括岛弧组合、蛇绿岩、蓝片岩相俯冲相关岩石和稀疏盖层，其年龄尚不清楚，但被认为是中生代。这项研究将确定火成岩的结晶、编码和变质年龄，并将获得地球化学、生物地层学、构造和古地磁数据。这些结果将被用来对比墨西哥西部和南部的构造地体，并确定边缘平行位移的时间和幅度。这些发现将对北美西部板块南部科迪勒拉的构造演化产生重要的制约。

The role of margin-parallel translations of accreted oceanic terranes is of current interest in transpressional orogens. This is an interdisciplinary investigation of deformed and metamorphosed oceanic rocks on islands off Baja California Sur, Mexico. The islands contain island arc assemblages, ophiolitic rocks, blueschist-facies subduction-related rocks and sparse cover, the ages of which are unknown but thought to be Mesozoic. This study will determine the ages of crystallization, coding, and metamorphism of the igneous rocks and will obtain geochemical, biostratigraphic, structural and paleomagnetic data. The results will be used to correlate tectonic terranes in western and southern Mexico and to determine the timing and magnitude of margin-parallel displacements. These findings will place important constraints on the tectonic evolution of the southern Cordillera of the western North American plate.