NDLI: Paleomagnetismo Y Mineralogía Magnética En Rocas De La Formación Saldaña Y Unidades Cretácicas Suprayacentes En La Parte Norte Del Valle Superior Del Magdalena, Colombia

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Paleomagnetismo Y Mineralogía Magnética En Rocas De La Formación Saldaña Y Unidades Cretácicas Suprayacentes En La Parte Norte Del Valle Superior Del Magdalena, Colombia

Content Provider	Semantic Scholar
Author	Bayona, German Silva, Carolina Costanzo-Álvarez, Vincenzo Aldana, Milagrosa Roncancio, Jairo
Copyright Year	2005
Abstract	Lavas, mudstones and volcaniclastics rocks from the Saldana (Upper Triassic - Lower Jurassic), Yavi and Alpujarra (Aptian) formations in the northern Upper Magdalena Valley were demagnetized using thermal and alternating field methods in order to isolate magnetic components and to establish a relative age of magnetization using several field tests. Magnetic mineralogy analyses permit the identification of the minerals that record uncovered magnetic components. Isolated components represent different events of magnetization. Directions parallel to the present Earth magnetic field were isolated in all the studied units. Characteristic components isolated from the Yavi Formation in Alpujarra area and from the Saldana Formation in Olaya Herrera area, may correspond to primary or near-to-deposition events of magnetization. In Olaya Herrera, the characteristic component of the Saldana Formation (D=179.9 I=7.1 N=8 k=17.19 α 95=13.7) is carried by magnetite. Characteristic components uncovered in two different structural domains document 43±29ocounterclockwise rotations previous to deposition of the Aptian Yavi Formation. Characteristic directions of the Yavi Formation are carried by hematite and magnetite, and the mean-site direction (D=5.2 I=6.2 N=7 k=40.15 α 95=9.6) suggests a pre-folding event of magnetization.
Starting Page	69
Ending Page	85
Page Count	17
File Format	PDF HTM / HTML
Volume Number	27
Alternate Webpage(s)	http://www.cgares.org/Directorio/Archivos/8515_VSM-UISfinal.pdf.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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