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Cerro Campanario, a towering landmark on the continental divide near Paso Pehuenche, is a glacially eroded remnant of a mafic stratovolcano that is much younger than previously supposed. Consisting of fairly uniform basaltic andesite, rich in olivine and plagioclase, the 10-15 km La edad y formación del cerro Campanario, un estratovolcán máfico de la Cordillera de Talca. Age and duration of the Matuyama-Brunhes geomagnetic polarity reversal from Ar incremental heating analyses of lavas. Upon successful completion, they receive a personalized certificate.These activities are available without cost on this website. Recommended System Requirements Click to see the technical details on using Geology Labs On-Line.The slope of the line determines the date, and the closeness of fit is a measure of the statistical reliability of the resulting date.Technical details on how these dates are calculated are given in Radiometric dating. As with any experimental procedure in any field of science, these measurements are subject to certain "glitches" and "anomalies," as noted in the literature.
In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.
Contour lines shown for Cerro Campanario only, interval 250 m.
Symbols: D- summit of Cerro Campanario; - selected elevations (in meters); stars- main vent locations for eruptive centers; x- locations of samples in tables 1 and 2; dip symbols show aproximate (primary) attitudes of stacks of lava flows; arrows shows flow directions of arroyos and lavas. View northeastward toward Cerro Campanario from 8 km southwest of the 3,943-m summit. Textures and Sr, Ba, Mg, Fe, K, and Ti compositional profiles in volcanic plagioclase: Clues to the dynamics of calcalkaline magma chambers.
For each dating or chronological method there is a link in the box at right to take you to that section of this page.
There, you will find a brief description of the method, plus links to take you to other webpages with more extensive information.