Sentences with phrase «same isotopic»

The probability that the impactor just happened to have the same isotopic signature as the Earth was vanishingly small.

The probability that the impactor just happened to have the same isotopic signature as Earth was vanishingly small.

Not exact matches

But planetary bodies that formed in different parts of the solar system generally have different isotopic compositions, so different that the isotopic signatures serve as «fingerprints» for planets and meteorites from the same body.

Yehoshua Kolodny at the Hebrew University in Jerusalem doubts whether the isotopic make - up of the T. rex skeleton is the same as it was when the animal was alive.

Referred to as the «lunar isotopic crisis,» this was a problem for the main theory of lunar formation, because it's highly unlikely the isotopes would be exactly the same for two random objects in the solar system.

The measurements show that 4 - Vesta contains the same hydrogen isotopic composition as carbonaceous chondrites, which is also that of Earth.

The UniChem connectivity search function allows users to find not only exact matches of their chemical structure across 60 million related molecules from 21 data sources worldwide, but also identifies «equivalent» structures that have the same atom connectivity while differing in stereochemistry or isotopic composition, or which exist in a different salt form.

Potassium - Argon Dating I Limitations of the If you read further in my second potassium - argon dating page: K - Ar - dating page 2 You will see that Ar dating method can overcome these limitations of conventional k - ar dating, and has the added advantage that potassium and argon are determined on the same sample and that only measurements of the isotopic ratios of argon are required.

Ar dating method can overcome these limitations of conventional k - ar dating, and has the added advantage that potassium and argon are determined on the same sample and that only measurements of the isotopic ratios of argon are required.

[Response: Unfortunately, you seem to have conveniently forgotten that Keigwin (and Pickart) published a paper in Science just a few years later in 1999 pointing that the appparent cooling (actually, the oxygen isotopic signal in question isn't entirely temperature, it is salinity as well, so the quantative 1 deg cooling estimate you cite is not actually reliable) in the Sargasso Sea is diametrically opposed by a substantial warming at the same time in the Laurentian Fan region of the North Atlantic off the coast of Newfoundland.

[Response: My recollection is that Zachos had the same observation from ODP cores, that surface - dwelling forams were either isotopically heavy or light, never transitional, but bottom - dwellers could be found with transitional isotopic composition.

Here's a more proper conclusion: Since the three isotopics of Carbon (in CO2) follow almost exactly the same laws, the response of any of them (or all of them together) to an injected excess in the atmosphere will be almost exactly the same.

Note that ppm and delta13C are not the same at all altitudes and evolve progressively, as illustrated by the airborne measurements of Nakazawa et al., Time and space variations of the carbon isotopic ratio, Tellus, 1993.

The content of the air is made of two sets (CO2 anthropic from emissions)(t) and (CO2 natural)(t); the lifetime of the molecules is the same for both sets and is known to be in the range 3 to 7 years; once a lifetime is assumed the (CO2 anthropic from emissions)(t) and its delta13C can be computed to get (CO2 natural)(t) and its isotopic signature; this is done for several assumed lifetimes of CO2 molecules in the air.

This method gives the same overall CO2 level as the cold crushing method, but more accurate isotopic measurements.