Expedition finds signs of life in Earth's mantle
|Expedition sites [Credit: © Bigelow Laboratory for Ocean Sciences]|
"The rocks collected on the expedition provide unique records of deep processes that formed the Atlantis Massif. We will also gain valuable insight into how these rocks react with circulating seawater at the seafloor during a process we call serpentinization and its consequences for chemical cycles and life" stated expedition Co-Chief Scientist Gretchen Fruh-Green.
"During drilling, we found evidence for hydrogen and methane in our samples, which microbes can 'eat' to grow and form new cells," explained Beth Orcutt, Co-Chief Scientist from Bigelow Laboratory. "Similar rocks and gases are found on other planets, so by studying how life exists in such harsh conditions deep below the seafloor, we inform the search for life elsewhere in the Universe."
The scientists are part of the International Ocean Discovery Program (IODP) Expedition 357, conducted by the European Consortium for Ocean Research Drilling (ECORD) as part of the IODP. The expedition set off from Southampton, UK, on October 26, 2015, aboard the Royal Research Vessel James Cook (operated by the National Environment Research Council, UK), returning on December 11, 2015. They brought with them the Rock Drill 2 from the British Geological Survey and the MeBo rock drill from MARUM in Bremen, Germany, for around-the-clock operations to collect rock cores from the Atlantis Massif, a 4,000-m tall underwater mountain along the Mid-Atlantic Ridge. The rock drills were equipped with new technologies to enable the scientists to detect signs of life in the rock samples.
During the past two weeks, the science party has been studying the rock samples in detail at the IODP Bremen Core Repository in Bremen, Germany. The science party consists of 31 scientists (16 female/15 male) from 13 different countries (Australia, Canada, China, France, Germany, Italy, Japan, Korea, Norway, Spain, Switzerland, UK, USA), ranging from students to tenured professors. At the end of this sampling party, the first results of the expedition will be reported.
Source: Bigelow Laboratory for Ocean Sciences [February 01, 2016]