Recent volcanic activity in baja california chapter 7 electricity note taking worksheet


As we saw with the tectonic introduction to the Walker Lane, the evolution of Baja California and the Gulf of California was initially driven by the subduction of the Farallon Plate under North America. That subduction went on for nearly 100 Ma starting in the Jurassic. It uplifted mountains and supplied significant magma for a chain of volcanoes gas ks and unerupted batholiths.

After the arrival of the East Pacific Rise and end of Farallon Plate subduction, an extensional regime at the boundary of North America started 35 Ma. Extension eventually peeled off the western portion of North America, opening a narrow trough that eventually got deep enough to fill with gas constant in atm sea water. This extensional regime extended into much of western North American, creating the Basin and Range Province. It effected the entire southern portion of the Basin and Range Province no electricity jokes from southern Arizona to the Trans-Mexican Volcanic Belt, with two branches around either end of the Sierra Madre. One researcher believes the batholiths of the Sierra Madre constrained the extension event to the Gulf of California. The gas meter car Sierra Madre is viewed as an unextended batholith island surrounded by extended terrain.

Attachment of western moving segments of North America (Baja California) to the Pacific Plate started 12 Ma and was complete perhaps 7 Ma. The new relative plate motion by the Pacific Plate was NNW relative to the North American Plate. The gas works park events plate boundary is mostly strike-slip transform faults connected with small short spreading segments forming new oceanic seafloor beneath the Gulf of California.

There was a long period of stretching and thinning of continental crust the preceded formation of the Gulf of California 13 – 7 Ma. The entire area is the Gulf Extensional Province. Extension was episodic, with mantle la gasolina in english heat from the thinning continental crust weakening it and allowing the formation of the rift along a long, narrow belt of hot, weak crust from the volcanic arc active immediately before formation of the new boundary.

With the rift separating Baja California from the North American Plate, the separation progressed with episodic creation of basins and the filling of those basins with eseva electricity bill payment sea water as the basins worked their way north into California. This is where the Colorado River got involved, filling those basins with river-derived sediments, essentially the volume of sediments eroded by the Colorado River from static electricity in the body effects the Colorado Plateau while it cut Grand Canyon over the last 6 – 5 Ma. Today the Colorado River Delta is just south of the California Border. It currently resides in the Salton Trough, on top of perhaps 6 km of debris above newly forming seafloor. This debris was successively deposited as the basin subsided.

Overhead image of Pinacante volcanic field. Major cone of Santa Clara is at the lower left of the image. Note electricity bill bihar electricity board the cinder cones, maars and lava flows on the flanks. Note also the difference in color between the erupted basalts and surrounding Colorado River debris field in the desert. Image courtesy

El Pinacante began as a single large now dormant shield volcano, Santa Clara. It is 1,200 m high and surrounded by over 500 cinder cones, maars and lava flows. Its lavas range gas in chest from 1.7 – 1.1 Ma, though the entire volcano may be as old as 4 – 3 Ma. It is overlain and flanked by younger cinder cones, lava flows, maars. Cerro Colorado is a 1.1 km diameter tuff ring. The youngest dated large crater is MacDougal Crater electricity words at 185,000 years old. The oldest is Elegante Crater at 460,000 years old.

The Ives flow is pahoehoe and alkali basalt. Its source was a 3.5 km long set of fissures near the base of Santa Clara. There are spatter ramparts. Lava flowed south and east, as far as 13 km from the source. There is a small area of aa. There is a large flowout where one of the lava tubes drained and gas gas its roof collapsed into the open space left.

Contains the only large andesitic stratovolcanoes in Baja California. Three volcanoes, La Virgen, El Azufre and El Viejo are constructed along a NE – SW line, with younger volcanoes to the south. The youngest volcano, La Virgen is an andesitic stratovolcano with maharashtra electricity e bill payment dacite lava domes. Major plinian eruption from a vent on the SW flank took place 6,500 years ago. The eruption may be older. Tephras covered 500 km2. Eruption also produced pyroclastic flows and lahars. There is a young, undated lava flow at the summit. Stratovolcanoes that get larger to the SW. Complex includes dacite lava domes, andesites, basaltic andesites, and dacites.

La Virgen is some 15 km3 gaz 67 for sale in volume. Initial cone-building was effusive lavas overlain with pyroclastic deposits as later phases became more explosive. The most recent widespread tephra (500 km2, 1.14 km3) is dated somewhere between 6,500 and 36,000 years old. One of the younger basaltic lava flows is dated 26,000 years. The rest are not. There are three domes to the south. A geothermal reservoir under the NE base of the volcano has supplied geothermal energy for a nearby port gas pump emoji town since 2006.