Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination
Fuente:
Redalyc
Enregistré dans:
| Auteur principal: | |
|---|---|
| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Universidad Nacional Autónoma de México
2006
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1876462995657195520 |
|---|---|
| author | Juan Morales |
| author_facet | Juan Morales |
| contents | Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination Juan Morales Avto Goguitchaichvili Jaime Urrutia-Fucugauchi Ciencias de la Tierra Cooling rate paleointensity volcanic rocks rock magnetism Effects of variation of cooling rate in the acquisition of thermoremanent magnetization (TRM) are analyzed on a suite ofvolcanic rocks. We use a three-step cooling rate experimental procedure applied at three distinct temperatures of TRM acquisition.Sixteen selected, thermally stable samples from Late Quaternary lava flows were given a pTRM (300°C) at a slow cooling rate.The acquired intensities were measured at room temperature. A second pTRM was applied to the same specimens using a fastcooling rate, and the acquired intensities were measured at room temperature. Finally a third pTRM was induced as in the firststep, using a slow cooling rate. The procedure was repeated to create pTRMs at higher temperatures of 450° and 550°C.Corresponding percent variations between magnetization intensities acquired at slow-fast and at slow-slow cooling rates werecalculated to investigate the influence of cooling rate on TRM intensity acquisition, and on TRM acquisition capacity. Weobserve values as high as 300 % in the former case (300 °C). Intensity of the ancient geomagnetic field obtained from volcanicrocks could be overestimated by at least 15% due to a variation in cooling rate normally employed in the laboratory, as comparedto slower rates found in nature. 2006 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56845205 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.45 |
| format | Artículo científico |
| id | redalyc_56845205 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination Juan Morales Ciencias de la Tierra Cooling rate paleointensity volcanic rocks rock magnetism Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination Juan Morales Avto Goguitchaichvili Jaime Urrutia-Fucugauchi Ciencias de la Tierra Cooling rate paleointensity volcanic rocks rock magnetism Effects of variation of cooling rate in the acquisition of thermoremanent magnetization (TRM) are analyzed on a suite ofvolcanic rocks. We use a three-step cooling rate experimental procedure applied at three distinct temperatures of TRM acquisition.Sixteen selected, thermally stable samples from Late Quaternary lava flows were given a pTRM (300°C) at a slow cooling rate.The acquired intensities were measured at room temperature. A second pTRM was applied to the same specimens using a fastcooling rate, and the acquired intensities were measured at room temperature. Finally a third pTRM was induced as in the firststep, using a slow cooling rate. The procedure was repeated to create pTRMs at higher temperatures of 450° and 550°C.Corresponding percent variations between magnetization intensities acquired at slow-fast and at slow-slow cooling rates werecalculated to investigate the influence of cooling rate on TRM intensity acquisition, and on TRM acquisition capacity. Weobserve values as high as 300 % in the former case (300 °C). Intensity of the ancient geomagnetic field obtained from volcanicrocks could be overestimated by at least 15% due to a variation in cooling rate normally employed in the laboratory, as comparedto slower rates found in nature. 2006 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56845205 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.2 Vol.45 |
| title | Cooling rate effects on the magnetization of volcanic rocks: Some implications for paleointensity determination |
| topic | Ciencias de la Tierra Cooling rate paleointensity volcanic rocks rock magnetism |
| url | https://www.redalyc.org/articulo.oa?id=56845205 |