Middle Miocene Rosarito Beach Formation, northwest Baja California, Mexico
Conference
·
· AAPG Bull.; (United States)
OSTI ID:6639494
The Rosarito Beach Formation was deposited on the continental borderland adjacent to the Peninsular Range province. This formation provides an insight to the paleo-oceanographic characteristics that are representative of marine sediments. The La Mision Member consists largely of basalts more than 150 m thick, which thin to the east. There are no pillow lavas or water-laid textures associated with this member. The Los Indios Member, which overlies the La Mision, consists of a wide variety of volcaniclastic marine sediments (tuffs, lapilli tuffs, tuffaceous sandstones) and 4-m thick diatomaceous layers. Basalts were emplaced through a series of fissures in the Mesozoic basement while the area was uplifted to the west. At the same time, the coastline receded to the east. The basalt flows that comprise the La Mision Member and the overlying pyroclastics were deposited at the same time that the coastline was moving east and the entire area was being faulted, building horst and graben structures (continental borderland). The diatomaceous sediments were deposited on this new shallow area associated with upwelling and an oxygen minimum layer, and were reinforced by the presence of grabens, which acted as silled basins. The silicic microfossils indicate a mixed environment of outer and inner shelves on a shallow platform no deeper than 200 m.
- Research Organization:
- Universidad Autonoma de Baja California, Ensenada (Mexico)
- OSTI ID:
- 6639494
- Report Number(s):
- CONF-8804144-
- Conference Information:
- Journal Name: AAPG Bull.; (United States) Journal Volume: 72:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Miocene tectono-stratigraphic history of La Mision basin, northwestern Baja California: implications for early tectonic development of southern California continental borderland
Volcano-tectonic evolution of the Castle Mountains: 22 to 14 MA
Evolution of a synextensional Miocene basin
Conference
·
Tue Mar 01 04:00:00 UTC 1988
· AAPG Bull.; (United States)
·
OSTI ID:6639419
Volcano-tectonic evolution of the Castle Mountains: 22 to 14 MA
Conference
·
Thu Apr 01 04:00:00 UTC 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5421913
Evolution of a synextensional Miocene basin
Conference
·
Thu Apr 01 04:00:00 UTC 1993
· Geological Society of America, Abstracts with Programs; (United States)
·
OSTI ID:5022165