Structural geology and geochronology of the Comondú Group in the Tembabichi area, Baja California Sur, México
Por:
Gracia-Marroquín, D, Cerca, M, López-Martínez, M, Bonini, M, Orozco-Esquivel, T
Publicada:
31 dic 2025
Resumen:
This study provides a geological map and regional interpretation of an area spanning E-W across the southern Baja California peninsula, Mexico. Characterizing the kinematics and timing of deformation within the Comond & uacute; Group (Oligocene-Miocene) is crucial to understand the evolution of the Gulf of California rift. Structural evidence indicates that the Lower Comond & uacute; volcanic and sedimentary sequence (dated similar to 29-19 Ma) was deposited in a sedimentary basin bounded by regional west-dipping normal faults, reflecting the progressive development of a broad extensional zone. We document NW to NE-trending, SW to NW-dipping normal faults, along with mafic and pyroclastic dykes dated between 18 and 15 Ma that share similar kinematic characteristics. Our findings suggest that these dykes were emplaced along pre-existing normal faults affecting the Lower to Middle Comond & uacute; Group. The geochronological and structural data presented on the main map provide new insights for deciphering the complex geological evolution of this region.
Filiaciones:
Gracia-Marroquín, D:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Tierra, Inst Geociencias, Queretaro, Qro, Mexico
Cerca, M:
Univ Nacl Autonoma Mexico, Inst Geociencias, Campus Juriquilla, Queretaro 76230, QRO, Mexico
López-Martínez, M:
CICESE, Ctr Invest Cient & Educ Super, Dept Geol, Ensenada, Mexico
Bonini, M:
Ist Geosci & Georisorse IGG, CNR, Florence, Italy
Orozco-Esquivel, T:
Univ Nacl Autonoma Mexico, Inst Geociencias, Campus Juriquilla, Queretaro 76230, QRO, Mexico
|