Matuyama-Brunhes transition recorded in lava flows of the Chilean Andes: Evidence for dipolar fields during reversals

Abstract

Research Article| April 01, 1994 Matuyama-Brunhes transition recorded in lava flows of the Chilean Andes: Evidence for dipolar fields during reversals Laurie Brown; Laurie Brown 1Department of Geology and Geography, University of Massachusetts, Amherst, Massachusetts 01003 Search for other works by this author on: GSW Google Scholar James Pickens; James Pickens 1Department of Geology and Geography, University of Massachusetts, Amherst, Massachusetts 01003 Search for other works by this author on: GSW Google Scholar Bradley Singer Bradley Singer 2Department of Mineralogy, University of Geneva, 1211 Geneva 4, Switzerland Search for other works by this author on: GSW Google Scholar Author and Article Information Laurie Brown 1Department of Geology and Geography, University of Massachusetts, Amherst, Massachusetts 01003 James Pickens 1Department of Geology and Geography, University of Massachusetts, Amherst, Massachusetts 01003 Bradley Singer 2Department of Mineralogy, University of Geneva, 1211 Geneva 4, Switzerland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1994) 22 (4): 299–302. https://doi.org/10.1130/0091-7613(1994)022<0299:MBTRIL>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Laurie Brown, James Pickens, Bradley Singer; Matuyama-Brunhes transition recorded in lava flows of the Chilean Andes: Evidence for dipolar fields during reversals. Geology 1994;; 22 (4): 299–302. doi: https://doi.org/10.1130/0091-7613(1994)022<0299:MBTRIL>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The transitional behavior exhibited by Earth's magnetic field during polarity reversals holds the key to understanding the complexities of the field. Interpretation of the severely limited reversal data set, however, remains controversial. Discussion centers around the nature of pole paths during transitions and their possible relation to other geophysical phenomena. Paleomagnetic data from Volcan Tatara-San Pedro in the central Chilean Andes (lat 36°S, long 71°W) provide the first record of the Matuyama-Brunhes reversal from South America and only the third transitional record from the Southern Hemisphere. A stratigraphic section of ten lava flows yielded intermediate pole positions that center in Australia; the mean pole is 16.8°S, 133.0°E. K-Ar analyses of two of these flows provided dates of 768 ±8 ka and 763 ±14 ka, ages coincident with the established Matuyama-Brunhes boundary. The clustering of these transitional poles strengthens the hypothesis that Earth's magnetic field retains a strong dipole component during reversals. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.