BROWN (US) — Water inside the moon’s mantle came from primitive meteorites, the same source believed to have supplied most of the water on Earth, researchers report.
They say the findings raise new questions about how the moon was formed.
The moon is thought to have formed from a disc of debris left when a giant object hit the Earth 4.5 billion years ago, very early in Earth’s history. Scientists have long assumed that the heat from an impact of that size would cause hydrogen and other volatile elements to boil off into space, meaning the moon must have started off completely dry.
But recently, NASA spacecraft and new research on samples from the Apollo missions have shown that the moon actually has water, both on its surface and beneath.
By showing that water on the moon and on Earth came from the same source, the new study, published in Science Express, offers yet more evidence that the moon’s water has been there all along.
“The simplest explanation for what we found is that there was water on the proto-Earth at the time of the giant impact,” says Alberto Saal, associate professor of geological sciences at Brown University and the study’s lead author. “Some of that water survived the impact, and that’s what we see in the moon.”
To find the origin of the moon’s water, researchers looked at melt inclusions found in samples brought back from the Apollo missions. Melt inclusions are tiny dots of volcanic glass trapped within crystals called olivine. The crystals prevent water escaping during an eruption and allow researchers to get an idea of what the inside of the moon is like.
Research from 2011 led by Erik Hauri of the Carnegie Institution of Washington found that the melt inclusions have plenty of water—as much water in fact as lavas forming on the Earth’s ocean floor.
The new study aimed to find the origin of that water. To do that, Saal and colleagues looked at the isotopic composition of the hydrogen trapped in the inclusions.
“In order to understand the origin of the hydrogen, we needed a fingerprint,” Saal says. “What is used as a fingerprint is the isotopic composition.”
Using a Cameca NanoSIMS 50L multicollector ion microprobe at Carnegie, the researchers measured the amount of deuterium in the samples compared to the amount of regular hydrogen.
Deuterium is an isotope of hydrogen with an extra neutron. Water molecules originating from different places in the solar system have different amounts of deuterium. In general, things formed closer to the sun have less deuterium than things formed farther out.
The researchers found that the deuterium/hydrogen ratio in the melt inclusions was relatively low and matched the ratio found in carbonaceous chondrites, meteorites originating in the asteroid belt near Jupiter and thought to be among the oldest objects in the solar system.
That means the source of the water on the moon is primitive meteorites, not comets as some scientists thought.
Comets, like meteorites, are known to carry water and other volatiles, but most comets formed in the far reaches of the solar system in a formation called the Oort Cloud. Because they formed so far from the sun, they tend to have high deuterium/hydrogen ratios—much higher ratios than in the moon’s interior, where the samples in this study came from.
A common source
“The measurements themselves were very difficult,” Hauri says, “but the new data provide the best evidence yet that the carbon-bearing chondrites were a common source for the volatiles in the Earth and Moon, and perhaps the entire inner solar system.”
Recent research, has found that as much as 98 percent of the water on Earth also comes from primitive meteorites, suggesting a common source for water on Earth and water on moon. The easiest way to explain that is that the water was already present on the early Earth and was transferred to the moon.
The finding is not necessarily inconsistent with the idea that the moon was formed by a giant impact with the early Earth, but presents a problem. If the moon is made from material that came from the Earth, it makes sense that the water in both would share a common source. However, there’s still the question of how that water was able to survive such a violent collision.
“The impact somehow didn’t cause all the water to be lost,” Saal says. “But we don’t know what that process would be.”
It suggests that there are some important processes we don’t yet understand about how planets and satellites are formed.
“Our work suggests that even highly volatile elements may not be lost completely during a giant impact,” says James Van Orman of Case Western Reserve University. “We need to go back to the drawing board and discover more about what giant impacts do, and we also need a better handle on volatile inventories in the moon.”
Funding for the research came from NASA’s Cosmochemistry and LASER programs and the NASA Lunar Science Institute.
Source: Brown University