Calculated heat flow for the Ensenada region, Baja California, Mexico

Due to the scarcity of heat flow data in the region of Ensenada, Baja California (Mexico), the present study calculated them using the silica geothermometer technique. The average heat flow value determined was 123.33 ± 35.57 mW m–2 (2.95 ± 0.85 HFU). Four zones within the study area, related to the main fault systems of the region, were found to have high hydrothermal activity. The potential use of geothermal resources in the area is feasible as it is considered a low geothermal system with water temperature values, above the static water level, that vary from 30ºC to 108ºC

Cerro prieto and its relation to the gulf of California spreading centers

The Cerro Prieto geothermal field is located in the Mexicali Valley, Baja California. Tectonically, this northern part of the Gulf of California has been classified as a spreading center, within a transitional area of oceanic to continental conditions. Thermal, geologic-tectonic and magnetic evidence has been used to postulate the existence of a heat source in the area that is associated with magmatic processes, similar to those that occur in a typical oceanic spreading center. Based on the petrography and geochemistry of the volcanic rocks obtained during the drilling of the Wells in the geothermal field, the rocks were classified as: basalts, basalt-andesites, andesites and dacites. The petrogenetic model of the intrusive volcanic bodies that is proposed for the area of crustal spreading at Cerro Prieto is different from the one proposed tor a typical oceanic spreading center, as is the case for the spreading centers located in the Gulf of California. This region of continental basaltic magmatism is complex due to: a) chemical composition and mineralogy of the mantle source, b) partial melting of the parent magma, c) magma segregation depth, and d) extension of the fractioned crystallization and the melting processes during the storage of the magma in the upper levels of the magmatic chamber

The journal Ciencias Marinas and its worldwide impact factor

This article deals with a short analysis of the journals indexed by the National Council of Science and Technology (CONACyT) in Mexico and their wordwide impact. It also compares the impact factor of the journal Ciencias Marinas to other journals related to marine sciences around the world, as well as their impact according to the Institute of Scientific Information (ISI), based on the volumes of the News Journal Citation Index (JCR). In respect to Ciencias Marinas, it was first integrated to ISI products by appearing in Current Contents back in 1992, with an aproximate impact factor of 0.22; this was calculated again in 1995 rising to 0.24. From 1995 to 1996, Ciencias Marinas five-folded its number of cites, and by 2000, it reached an impact factor of 0.333. The journal Ciencias Marinas thanks the hundreds of authors and coathors of the articles that were published in our journal since 1974 until 1997. Thanks to you, to your effort and contributions to Science, Ciencias Marinas has reached the quality standards that allow the satisfaction of being indexed among ISI products, neither being this its only pride nor the most important

Origin of a sedimentary sequence on the north island of Todos Santos, B.C., Mexico

The Todos Santos Islands are located within Todos Santos Bay, Baja California. A small sedimentary sequence of about 160 m length and 18 m height is located on the north island. The fine sediments that constitute this unit are associated with conglomerates and interbedded sedimentary breccias. Structurally, this sequence is affected by normal faults with a NE-SW dominant strike and a slip to the East. Sedimentary structures in this sequence are found represented by mud cracks and raindrops, which are present in the lower part of the sequence. The sedimentary lithology basically consists of arkoses, clays, muds, tuffs and conglomerates, and the volcanics are basalts and andesites. Due to the lack of fossils, the age has been established through correlation with other sedimentary sequences known in the area such as: the Rosarito Beach Formation (Las Glorias Member), the basalts and tuffs of La Misión and El Descanso and the Coronado Islands. Therefore, we propose the age for this sedimentary sequence as Miocene. The source of the volcanic material was located to the west of the actual coastline and the sedimentary sequence originated to the east. Based on sedimentary structures and textures, this study determined that the depositional environment of the sedimentary sequence was subaerial, that the nature of the sediment is typical of an alluvial fan and that this sequence belongs to the proximal part of this.