Results 91 to 100 of about 519 (182)

Paleomagnetism of Young New Zealand Basalts and Longitudinal Distribution of Paleosecular Variation.

Journal of geomagnetism and geoelectricity, 1995
A paleosecular variation (PSV) study was carried out on monogenic basalt volcanoes of the northern part of North Island, New Zealand. A new method of calculating angular standard deviation (ASD) by fitting a combination of two Fisher distributions to the cumulative histogram of VGP data is presented, which avoids the necessity of applying an arbitrary ...
Shibuya, Hidetoshi, Cassidy, John, Smith, Ian E. M., Itaya, Tetsumaru   +3 more
openaire   +2 more sources

A comprehensive paleomagnetic study from the last Plinian eruptions of Popocatepetl volcano: absolute chronology of lavas and estimation of emplacement temperatures of PDCs

Earth, Planets and Space, 2019
Three lava flows (Buenavista, Xalitzintla and Nealtican) and pyroclastic density currents (Lorenzo and Pink Pumice) from two Popocatepetl Plinian eruptions were sampled for paleomagnetic dating.
Nayeli Pérez-Rodríguez, Juan Morales, Avto Goguitchaichvili, Felipe García-Tenorio   +3 more
doaj   +1 more source

A detailed paleomagnetic and rock-magnetic investigation of the Matuyama-Bruhnes geomagnetic reversal recorded in tephra-paleosol sequence of Tlaxcala(Central Mexico)

Frontiers in Earth Science, 2015
Geomagnetic reversals are global phenomena, for about 50 years the paleomagnetists attempted to acquire as many detailed records as possible using the magnetic memory of sediments and lava flows.
Ana Maria Soler-Arechalde, Avtandyl eGoguitchaichvili, Ángel eCarrancho, Sergey eSedov, Cecilia Irene Caballero-Miranda, Beatriz eOrtega, Berenice eSolís, Juan Julio Morales Contreras, Jaime eUrrutia-Fucugauchi, Francisco eBautista   +9 more
doaj   +1 more source

Paleomagnetic study of the 30 ka Aira caldera-forming eruption and 60–45 ka Iwato pyroclastic flow deposits, southern Kyushu, Japan

Earth, Planets and Space
To constrain the age and duration of large-scale caldera-forming eruptions, we measured paleomagnetic directions of pyroclastic deposits from the 30 ka Aira caldera eruption sequence, and the 60–45 ka Iwato pyroclastic flow deposits around Aira caldera ...
Takeshi Hasegawa, Nobutatsu Mochizuki, Hidetoshi Shibuya, Ayumu Nishihara, Chie Kusu, Shohei Shibata, Makoto Okada, Kuniaki Nishiki, Yuki Sato   +8 more
doaj   +1 more source

Archaeomagnetic Insights into Pre-Hispanic Mayan Lime Production: Chronological Framework and Evidence of an Apparent 500-Year Hiatus in the Yucatán Peninsula

Quaternary
The Yucatán Peninsula, a key region of the ancient Maya civilization, has long presented challenges in establishing absolute chronological frameworks for its cultural practices.
Jocelyne Martínez Landín, Avto Goguitchaichvili, Soledad Ortiz, Oscar de Lucio, Vadim A. Kravchinsky, Rubén Cejudo, Miguel Cervantes, Rafael García-Ruiz, Juan Morales, Francisco Bautista, Ángel Gongora Salas, Iliana Ancona Aragon, Wilberth Cruz Alvardo, Carlos Peraza Lope   +13 more
doaj   +1 more source

Detecting dipolarity of the geomagnetic field in the paleomagnetic record. [PDF]

Proc Natl Acad Sci U S A, 2023
Lhuillier F, Shcherbakov VP, Sycheva NK.
europepmc   +1 more source

First paleomagnetic results of mid-to late Holocene sediments from Lake Issyk-Kul (Kyrgyzstan): Implications for paleosecular variation in central Asia

, 2013
We present new paleomagnetic and rock magnetic data from mid and late Holocene sediments recovered in two gravity cores (C087 and C142a) from Lake Issyk-Kul (central Asia), for which independent radiocarbon-based age models are available.
Giralt, Santiago, Gómez-Paccard, Miriam, Larrasoaña, Juan C., Roberts, Andrew P.   +3 more
core   +1 more source

New paleomagnetic results from Neogene to Quaternary volcanic rocks of north of the Lake Van, Eastern Turkey. [PDF]

Sci Rep, 2023
Kayın S, İşseven T.
europepmc   +1 more source

Pseudopaleosecular variation due to remanence anisotropy in a pyroclastic flow succession

, 2002
International audienceIn order to check the reliability of a paleosecular variation record in a sequence of pyroclastic rocks (Miocene, Sardinia), we measured various types of anisotropy: magnetic susceptibility (AMS), anhysteretic remanent magnetization
Jerome Gattacceca, Pierre Rochette, Gattacceca, J., Rochette, Pierre   +3 more
core   +1 more source

Paleosecular Variation in Field Directions Due to Randomly Varying Gauss Coefficients.

Journal of geomagnetism and geoelectricity, 1997
Expressions are derived for the magnetic field directions produced by randomly varying Gauss coefficients. This approach was pioneered by Constable and Parker (1988), and followed by Kono and Tanaka (1995) and Kono and Hiroi (1996). The present treatment is a sequel to the latter two.
openaire   +2 more sources