Sentences with word «paleomagnetic»

That estimate is backed up by paleomagnetic data, which show that this portion of the reef must have formed after Earth's magnetic poles last reversed, some 790,000 years ago.

It's attractive in that it explains several lines of otherwise problematic evidence (near - ubiquitous glacial sediments, including many in paleo - low latitudes as indicated by paleomagnetic studies, overlain by equally ubiquitous «cap carbonates» (resulting from a CO2 insolubility spike at Snowball Earth termination).

Paleomagnetic studies of a meteorite from asteroid Vesta reveal remanent magnetization produced by an ancient core dynamo.

The dates — determined by argon - argon dating and confirmed by paleomagnetic measurements and analysis of animal bones found in the same sediments — place the teeth and bones around the time when most geneticists believe that humans and chimpanzees split from a common ancestor, between 6 million and 9 million years ago.

Examining paleomagnetic data, geoscientists at Johns Hopkins University suggest that the eastern and western halves of Earth's core take turns growing and melting.

Angrites are igneous rocks, many of which are thought to have erupted onto the surface of asteroids very early in the solar system's history and then quickly cooled, freezing their original properties — including their composition and paleomagnetic signals — in place.

They estimated the age of the volcanic rocks and sediments that encased the fossils with argon - dating and paleomagnetic methods.

The revised age — depth model reveals that the published age estimates based on some previously identified paleomagnetic events and optically stimulated luminescence dates from MAL05 - 1C are inaccurate for sediment older than ∼ 50 ka.

The age of the fossils was corroborated by radiometric dating (using radioactive isotopes), the global paleomagnetic sequence (signatures of reversals of Earth's magnetic field found in the samples), and fossil correlations (age of other fossils).

The researchers say Rising Star Cave was dated using a combination of optically stimulated luminescence of sediments with uranium - thorium dating and paleomagnetic analyses of flowstones to establish how the cave sediments relate to the geological timescale in the Dinaledi Chamber.

Although utilized for rock magnetic applications as well, through software and procedures developed with collaborators at MIT and Harvard, the magnetic moment can be calculated from very weak magnetic samples to address paleomagnetic questions.

The U-Pb data, coupled with paleomagnetic constraints, provide an age range from to Ma.

«Oxygen Isotope and Paleomagnetic Stratigraphy of Equatorial Pacific Core V28 - 238: Oxygen Isotope Temperatures and Ice Volumes on a 10 ^ 5 Year and 10 ^ 6 Year Scale.»

A large number of such data have been produced over the past decades in paleomagnetic laboratories around the world, so that the amount of available data is getting large enough to allow for global inversion models of the Holocene magnetic field.

Information about the magnetic field evolution prior to the times of direct observations is determined in laboratory procedures from archeo - and paleomagnetic material.

Sohl, L.E., N. Christie - Blick, and D.V. Kent, 1999: Paleomagnetic polarity reversals in Marinoan (ca. 600 Ma) glacial deposits of Australia: Implications for the duration of low - latitude glaciation in Neoproterozoic time.

Paleomagnetic data support this interpretation, says Steinberger.

Paleomagnetic dating — matching magnetic properties in the sediments surrounding a fossil or artifact to ancient reversals in the Earth's magnetic poles to determine age — later determined the tools had to have been made 3.3 million years ago.

Finally, paleomagnetic studies by Fu et al. (p. 238) on a meteorite originating from Vesta suggest that magnetic fields existed on the surface of the asteroid 3.7 billion years ago, supporting the past existence of a magnetic core dynamo.

Researchers, led by Yohannes Haile - Selassie co-authored a paper in the Proceedings of the National Academy of science (PNAS) reporting the discovery, piecing together and analysis of a partially complete male skeleton dated by paleomagnetic and radiometric methods to 3.6 million years ago.

Some of the methods used to determine the age of the planet include: Stratigraphy, Dendrochronology, Obsidian Hydration Dating, Paleomagnetic / Archaeomagnetic, Luminescence Dating, Amino Acid Racemization, Fission - track Dating, Ice Cores, Cation Ratio, Fluorine Dating, Patination, oxidizable Carbon Ratio, Electron Spin Resonance, and Cosmic - ray Exposure Dating.

Some other dating methods that have confirmed the age of the earth as being far greater than 10,000 yeras include: Stratigraphy, Dendrochronology, Obsidian Hydration Dating, Paleomagnetic / Archaeomagnetic, Luminescence Dating, Amino Acid Racemization, Fission - track Dating, Ice Cores, Cation Ratio, Fluorine Dating, Patination, oxidizable Carbon Ratio, Electron Spin Resonance, and Cosmic - ray Exposure Dating.

Further advances in understanding the acquisition of magnetisation in archeo - and paleomagnetic data, continuing development of improved laboratory procedures and further investigations of suitability and appropriate scaling of sedimentary relative intensity records will help to reduce uncertainties in the data, and consequently also in the models.

A number of new millennial - scale geomagnetic field reconstructions have been published over the last years, based on improved global archeo - and paleomagnetic data compilations.

We first discuss important archeo - and paleomagnetic data characteristics.

Distribution of available Holocene archeo - and paleomagnetic data (status as described by Donadini et al. 2009 and Korte et al. 2011).

Knowledge about geomagnetic field directions and intensity prior to direct observations comes from archeo - and paleomagnetic data.

Unfortunately, data and age uncertainties in the case of archeo - and paleomagnetic data are not well determined, and the age uncertainties can not be taken into account properly in the inversion scheme.

The approximate orientations and locations of Silurian continents can be reconstructed using a combination of paleomagnetic, paleoclimatic, and biogeographic data.