New Information About How Earth, the Moon, and Mars Are Created

Sunday, 12 December 2010 15:21

New research reveals that the abundance of so-called highly siderophile, or metal-loving,

elements like gold and platinum found in the mantles of Earth, the Moon and Mars were

delivered by massive impactors during the final phase of planet formation over 4.5 billion years

ago. The predicted sizes of the projectiles, which hit within tens of millions of years of the giant

impact that produced our Moon, are consistent with current planet formation models as well as

physical evidence such as the size distributions of asteroids and ancient Martian impact scars.

They predict that the largest of the late impactors on Earth -- at 1,500 to 2,000 miles in diameter

-- potentially modified Earth's obliquity by approximately 10 degrees, while those for the Moon,

at approximately 150-200 miles, may have delivered water to its mantle.

The team that conducted this study comprises solar system dynamicists, such as Dr. William

Bottke and Dr. David Nesvorny from the Southwest Research Institute, and

geophysical-geochemical modelers, such as Prof. Richard J. Walker from the University of

Maryland, Prof. James Day from the University of Maryland and Scripps Institution of

Oceanography, and Prof. Linda Elkins-Tanton, from the Massachusetts Institute of Technology.

Together, they represent three teams within the NASA Lunar Science Institute (NLSI).

A fundamental problem in planetary science is to determine how Earth, the Moon, and other

inner solar system planets formed and evolved. This is a difficult question to answer given that

billions of years of history have steadily erased evidence for these early events. Despite this,

critical clues can still be found to help determine what happened, provided one knows where to

look.

For instance, careful study of lunar samples brought back by the Apollo astronauts, combined

with numerical modeling work, indicates that the Moon formed as a result of a collision between

a Mars-sized body and the early Earth about 4.5 billion years ago. While the idea that the

Earth-Moon system owes its existence to a single, random event was initially viewed as radical,

it is now believed that such large impacts were commonplace during the end stages of planet

formation. The giant impact is believed to have led to a final phase of core formation and global

magma oceans on both the Earth and Moon.

For the giant impact hypothesis to be correct, one might expect samples from the Earth and

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New Information About How Earth, the Moon, and Mars Are Created

Sunday, 12 December 2010 15:21

Moon's mantle, brought to the surface by volcanic activity, to back it up. In particular, scientists

have examined the abundance in these rocks of so-called highly siderophile, or metal-loving,

elements: Re, Os, Ir, Ru, Pt, Rh, Pd, Au. These elements should have followed the iron and

other metals to the core in the aftermath of the Moon-forming event, leaving the rocky crusts

and mantles of these bodies void of these elements. Accordingly, their near-absence from

mantle rocks should provide a key test of the giant impact model.

However, as described by team member Walker, "The big problem for the modelers is that

these metals are not missing at all, but instead are modestly plentiful." Team member Day

adds, "This is a good thing for anyone who likes their gold wedding rings or the cleaner air

provided by the palladium in their car's catalytic convertors."

A proposed solution to this conundrum is that highly siderophile elements were indeed stripped

from the mantle by the effects of the giant impact, but were then partially replenished by later

impacts from the original building blocks of the planets, called planetesimals. This is not a

surprise -- planet formation models predict such late impacts -- but their nature, numbers, and

most especially size of the accreting bodies are unknown. Presumably, they could have

represented the accretion of many small bodies or a few large events. To match observations,

the late-arriving planetesimals need to deliver 0.5 percent of the Earth's mass to Earth's mantle,

equivalent to one-third of the mass of the Moon, and about 1,200 times less mass to the Moon's

mantle.

Using numerical models, the team showed that they could reproduce these amounts if the late

accretion population was dominated by massive projectiles. Their results indicate the largest

Earth impactor was 1,500-2,000 miles in diameter, roughly the size of Pluto, while those hitting

the Moon were only 150-200 miles across. Lead author Bottke says, "These impactors are

thought to be large enough to produce the observed enrichments in highly siderophile elements,

but not so large that their fragmented cores joined with the planet's core. They probably

represent the largest objects to hit those worlds since the giant impact that formed our Moon."

Intriguingly, the predicted distribution of projectile sizes, where most of the mass of the

population is found among the largest objects, is consistent with other evidence.

-   New models describing how planetesimals form and evolve suggest the biggest ones

efficiently gobble up the smaller ones and run away in terms of size, leaving behind a population

of enormous objects largely resistant to collisional erosion.

-   The last surviving planetesimal populations in the inner solar system are the asteroids. In

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New Information About How Earth, the Moon, and Mars Are Created

Sunday, 12 December 2010 15:21

the inner asteroid belt, the asteroids Ceres, Pallas and Vesta, at 600, 300 and 300 miles across,

respectively, dwarf the next largest asteroids at 150 miles across. No asteroids with

"in-between" sizes are observed in this region.

-   The sizes of the oldest and largest craters on Mars, many of which are thousands of miles

across, are consistent with it being bombarded by an inner asteroid belt-like population

dominated by large bodies early in its history.

These results make it possible to make some interesting predictions about the evolution of the

Earth, Mars and the Moon. For example:

-   The largest projectiles that struck Earth were capable of modifying its spin axis, on

average, by approximately 10 degrees.

-   The largest impactor to strike Mars, according to this work and the abundance of highly

siderophile elements found in Martian meteorites, was 900-1,100 miles across. This is

approximately the projectile size needed to create the proposed Borealis basin that may have

produced Mars' global hemispheric dichotomy.

-   For the Moon, the projectiles would have been large enough to have created the

South-Pole-Aitkin basin or perhaps a comparable-sized early basin. Moreover, if they contained

even a trace amount of volatiles, then the same processes that brought highly siderophile

elements to the Moon's mantle may have also delivered its observed abundance of

water.{jcomments on}

 

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