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NMSU researchers take small tools to big caves looking for signs of life

Professors at New Mexico State University are going further than they have ever gone before, using scaled-down versions of equipment that may eventually be used to search for life on other planets. At Fort Stanton Cave near Ruidoso, a team of faculty and graduate students recently tried something new ? simultaneous, on-the-spot analysis of rock samples with instruments small enough to fit in a backpack.



NMSU geology graduate student Arriana Chavez uses 30-pound backpack Laser-Induced Breakdown Spectroscopy on the wall inside Fort Stanton Cave.
Two women sitting in a cave using laser
NMSU geology graduate student Arriana Chavez (left) and NMSU geology professor Nancy McMillan analyze rocks two miles into Fort Stanton Cave. (Courtesy photo)
Two men sitting in a cave looking at equipment
NMSU graduate students Kyle Uckert, astronomy, and Ivan Dragulin, engineering, set up the Portable AOTF Spectrometer for Astrobiology inside Fort Stanton Cave. (Courtesy photo)

?We collected 20 samples and analyzed them right there with both instruments, said Nancy McMillan, geology professor and department head in the College of Arts and Sciences. ?Then we set off with the instruments to analyze samples on the wall. I can get all the information I need in the field and I don?t have to break a rock off the wall to do it.?

The two instruments used at Fort Stanton Cave included a Portable AOTF Spectrometer for Astrobiology (PASA) and a 30-pound backpack model Laser-Induced Breakdown Spectroscopy (LIBS).

?The objective of the program was to use two different technologies ? one of which we developed through a partnership through astronomy and electrical engineering and the other which has been developed with the geology department -- to look at samples of rocks in caves to see if we can identify signatures of life,? said Nancy Chanover, associate professor of astronomy.

A LIBS instrument gathers the chemical composition of an object using a high-powered pulse laser that works in the visible portion of the spectrum, while the AOTF instrument collects reflectance information from a sample, indicative of its molecular structure, using a narrow portion of the spectrum in the near infrared.

?The two different instruments tell us two different types of things about the rocks we?re looking at,? Chanover said. ?By using two technologies together we can gain a better understanding of the nature of those rocks and whether they are inhabited by microbial colonies.?

?With this portable equipment, you could analyze thousands of samples out in the field,? McMillan said. ?It takes just a few minutes to analyze a sample compared to breaking off a sample, bringing it into a lab where you have to have trained personnel and it might take you days to get the sample prepared.?

The project was funded with a nearly $40,000 Interdisciplinary Research Grant from NMSU?s Office of the Vice President for Research. The team includes McMillan, Chanover, David Voelz, professor of electrical engineering and David Cremers, from Applied Research Associates in Albuquerque, which built the backpack LIBS laser; along with graduate students Kyle Uckert, Ivan Dragulin and Arriana Chavez.

The Fort Stanton Cave Study Project, a non-profit organization, was instrumental in assisting the NMSU researchers. Steve Peerman, director, and Wayne Walker, assistant director, helped Chanover and McMillan?s team in a number of ways, including gaining access to the cave and leading researchers to various sites within the cave.

Both Chanover and McMillan say the equipment performed as expected. They will take the data obtained during the cave expedition and model it over the summer.

?The data will show us whether the rock was crystalized by bacteria or whether a rock was crystallized inorganically,? said McMillan. ?The ultimate goal in the future would be that you zap it in the field and on your screen it says biologic or not biologic so you see this instant gratification.?

Both researchers believe over time, equipment that now fits in a backpack may become even smaller and easier to use in extreme environments. By demonstrating that portable versions of this technology work in remote field locations on Earth, NMSU researchers will be in a better position to pursue larger research grants for developing flight-ready or flight-capable instrumentation to go on missions to other bodies in the solar system.

?Ultimately we?d like to send our instrumentation to another planet to look for signatures of either current life or past life on those planets,? Chanover said.