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    The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
    • 2015-10-14 14:30:00
    • Article ID: 641399

    X-Ray Study Reveals New Details of How Burrowing Sea Creatures Shape Geology

    Study at SLAC's SSRL Could be Used to Study Ancient Climate, Aid Hunt for Gas and Oil

    • Credit: Wikimedia Commons

      This marine worm, commonly known as a ragworm, can grow up to 4 inches in length. It is part of a class of worms known as polychaetes. A tiny variety of polychaetes, perhaps a millimeter in length, may have been responsible for creating burrows that were studied in 80-million-year-old fossil samples at SLAC's Stanford Synchrotron Radiation Lightsource. The fossil study explored the chemical traces associated with the ancient burrows.

    • Credit: D. Harazim, et al., Geology

      Using a rapid X-ray scanning technique developed for fossil studies at SLAC's Stanford Synchrotron Radiation Lightsource, researchers studied the detailed chemistry of fossilized burrows, likely produced by sea worms 80 million years ago. These images show a black and white photograph of a cross-section of a fossil sample (left), a false-color scan of the sample's iron content (middle, with iron concentrations shown in lighter shades), and a false-color scan of the phosphorous content (right, with phosphorous concentrations shown in lighter shades).

    Research at the Department of Energy's SLAC National Accelerator Laboratory reveals new details about how tiny, burrowing sea organisms can influence the chemistry and structure of rocks where hydrocarbon deposits such as oil and gas are found.

    An international team of scientists used X-rays to image the chemistry of rock samples containing well-preserved 80-million-year-old fossilized burrows, which may have been made by millimeter-sized bristly worms known as polychaetes. They found that the worms appeared to concentrate some chemical elements in their burrows while depleting others.

    The study, published online Oct. 7 in the journal Geology, provides new insight into how ancient sea worms interact with the sediment on the ocean bottom and control the composition and geochemical signature of rocks formed by that sediment, which today serve as markers for ancient climate patterns and oil and gas reservoirs.

    The pioneering X-ray scanning method that researchers used at SLAC opens up new ways to study Earth's distant environmental and geological past and supports research about the formation of hydrocarbon deposits.

    While it’s only in its early stages, the research shows a lot of promise, said Dario Harazim, a petroleum geologist who led the study while working as instructor at Memorial University of Newfoundland in Canada. “We might need to rethink the processes of how certain elements are incorporated into the rock record – how they are preserved and how we use them to reconstruct the chemistry and other properties of the ancient ocean,” Harazim said.

    “To date, the ancient ocean temperatures, oxygen levels and other factors important in rock formation have been considered major drivers controlling the accumulation of trace elements in the rock,” he said. “Here, we provide new insight into how burrowing organisms play a major role in controlling the trace amounts of some elements in rocks formed from sediment.”

    While the sea worms like the ones that likely made these ancient burrows are still important in the modern environment, they are difficult to observe because they are embedded in the sticky mud of the sea floor. Removing worms and their surrounding mud to a more convenient location for study would disrupt their relationship with their natural environment and might not yield trustworthy results.

    From Dino Birds to Burrowing Worms

    Harazim partnered with a research group based at University of Manchester to study exceptionally preserved rock samples from Baja California in Mexico. The Manchester group had worked with SLAC distinguished staff scientist Uwe Bergmann to develop a fast X-ray scanning technique for studying fossils at SLAC’s Stanford Synchrotron Radiation Lightsource (SSRL), a DOE Office of Science User Facility. The technique has been used to study chemical traces of feathers and tissues in a famous fossil link between birds and dinosaurs.

    Unlike many conventional techniques, the unique fast-scanning technique at SSRL is non-destructive, so it preserved the features and localized chemistry of the worm burrows. It can also image large sample surfaces of up to tens of square centimeters.

    "The large-scale imaging capabilities at SSRL permitted the precise mapping of very small chemical concentrations associated with these organisms' interaction with their environment,” said Phillip Manning, a University of Manchester paleontologist who helped to pioneer the technique. "This latest collaboration between accelerator physics and paleontology has once again resurrected chemical ghosts that shed new light on key scientific questions.”

    The study shows how a unique and sophisticated feeding strategy allows the sea worms to separate sediment particles of different sizes, Harazim said: “They consume mineral particles, clay and bacteria that live on the mineral surfaces. As this mix passes through their chemically aggressive gut, this material is getting broken down and degraded.”

    The way the worms redistribute and digest these grains, and how they control the concentration of some elements, is still not well understood. Their feeding creates pockets of porous sediment that can potentially fill over time with concentrations of mineral cement, organic material and potentially even hydrocarbons.

    The researchers, who verified the SSRL results with those obtained from other conventional methods, found that certain elements, including strontium and barium, are depleted from all areas of the rock. These elements were likely either being absorbed into the worms’ bodies or released to the surrounding waters.

    Applications in Ancient Climate, Ocean Chemistry Studies

    Further research may lead to a better understanding of how analyzing the chemical signature of these burrowing organisms may relate to ancient climate patterns and changes in ocean chemistry, Harazim said. “This technique allows you to study how the activity of burrowing organisms can influence the chemistry and composition of the rock they are living in. It helps us to better understand the geological record and helps us to read Earth’s geological past in a more sophisticated way,” he said.

    He said there are plans for follow-up research with different types of fossilized samples to see if there are commonalities in their chemical concentration and distribution.

    “There is still a lot to learn about how these organisms impact the porosity and geochemical composition of rocks, and how loose sediment becomes rock,” he said.

    The work was supported by the American Association of Petroleum Geologists, the International Association of Sedimentologists, the Society for Sedimentary Geology, the Geological Society of America, the Natural Sciences and Engineering Research Council of Canada, and the Science and Technology Facilities Council.

    SLAC is a multi-program laboratory exploring frontier questions in photon science, astrophysics, particle physics and accelerator research. Located in Menlo Park, Calif., SLAC is operated by Stanford University for the U.S. Department of Energy's Office of Science. For more information, visit slac.stanford.edu.

    SLAC National Accelerator Laboratory is supported by the Office of Science of the U.S. Department of Energy. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov.

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    AI for Plant Breeding in an Ever-Changing Climate

    AI for Plant Breeding in an Ever-Changing Climate

    In this Q&A, Oak Ridge National Laboratory's Dan Jacobson talks about his team's work on a genomic selection algorithm, his vision for the future of environmental genomics, and the space where simulation meets AI.

    A New Parallel Strategy for Tackling Turbulence on Summit

    A New Parallel Strategy for Tackling Turbulence on Summit

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    Modeling Every Building in America Starts with Chattanooga

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    Scientists Explore Egyptian Mummy Bones With X-Rays and Infrared Light to Gain New Insight on Ancient Life

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    Deep Learning Expands Study of Nuclear Waste Remediation

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    ORNL to host 13 teams for DOE CyberForce Competition

    ORNL to host 13 teams for DOE CyberForce Competition

    Oak Ridge National Laboratory will give college students the chance to practice cybersecurity skills in a real-world setting as a host of the Department of Energy's fifth collegiate CyberForce Competition on Nov. 16.

    Argonne nuclear engineer J'Tia Hart selected to Crain's Chicago Business "40 Under 40"

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    Argonne National Laboratory has won a regional Federal Green Challenge award for conserving resources and saving taxpayers' money.

    PPPL wins $70,000 in project funding from DOE for entrepreneurship

    PPPL wins $70,000 in project funding from DOE for entrepreneurship

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    Brookhaven-Commonwealth Fusion Energy Project Wins DOE Funding

    Brookhaven-Commonwealth Fusion Energy Project Wins DOE Funding

    Brookhaven's Superconducting Magnet Division will partner with industry to develop and characterize superconducting power cables.

    U.S. Department of Energy to Hold Fifth CyberForce Competition(tm)

    U.S. Department of Energy to Hold Fifth CyberForce Competition(tm)

    Going on its fourth year, DOE's CyberForce Competition(tm) on Nov. 15-16 will give teams of cybersecurity students and professionals the opportunity to compete and refine their skills in real-time at 10 national laboratories across the U.S.

    Daniel Gruen awarded 2019 Panofsky Fellowship at SLAC

    Daniel Gruen awarded 2019 Panofsky Fellowship at SLAC

    Daniel Gruen's work on how massive objects bend light from distant galaxies is aimed at unraveling some of the greatest mysteries of modern physics: What is dark matter? What is dark energy, and how is it accelerating the expansion of the universe?

    DOE Announces FY 2020 Small Business Innovation Research Funding Opportunity

    The Department of Energy (DOE) Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) programs issued its FY 2020 Phase II Release 1 Funding Opportunity Announcement (FOA) with approximately $97 million in available funding.

    Research effort by Argonne National Laboratory and the University of Chicago results in R&D 100 Award

    Research effort by Argonne National Laboratory and the University of Chicago results in R&D 100 Award

    A joint effort by the U.S. Department of Energy's Argonne National Laboratory and the University of Chicago has led to a prestigious R&D 100 Award and is expected to bring an innovation closer to market so it ultimately can be used in many industrial applications.

    Department of Energy Awards Fermilab Funding for Next-Generation Dark Matter Research

    Department of Energy Awards Fermilab Funding for Next-Generation Dark Matter Research

    The U.S. Department of Energy announced that it has awarded scientists at its Fermi National Accelerator Laboratory funding to boost research on dark matter, the mysterious substance that makes up an astounding 85% of the matter in the universe.


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    Harvesting Energy from Light using Bio-inspired Artificial Cells

    Harvesting Energy from Light using Bio-inspired Artificial Cells

    Scientists designed and connected two different artificial cells to each other to produce molecules called ATP (adenosine triphosphate).

    Engineering Living Scaffolds for Building Materials

    Engineering Living Scaffolds for Building Materials

    Bone and mollusk shells are composite systems that combine living cells and inorganic components. This allows them to regenerate and change structure while also being very strong and durable. Borrowing from this amazing complexity, researchers have been exploring a new class of materials called engineered living materials (ELMs).

    Excavating Quantum Information Buried in Noise

    Excavating Quantum Information Buried in Noise

    Researchers developed two new methods to assess and remove error in how scientists measure quantum systems. By reducing quantum "noise" - uncertainty inherent to quantum processes - these new methods improve accuracy and precision.

    How Electrons Move in a Catastrophe

    How Electrons Move in a Catastrophe

    Lanthanum strontium manganite (LSMO) is a widely applicable material, from magnetic tunnel junctions to solid oxide fuel cells. However, when it gets thin, its behavior changes for the worse. The reason why was not known. Now, using two theoretical methods, a team determined what happens.

    When Ions and Molecules Cluster

    When Ions and Molecules Cluster

    How an ion behaves when isolated within an analytical instrument can differ from how it behaves in the environment. Now, Xue-Bin Wang at Pacific Northwest National Laboratory devised a way to bring ions and molecules together in clusters to better discover their properties and predict their behavior.

    Tune in to Tetrahedral Superstructures

    Tune in to Tetrahedral Superstructures

    Shape affects how the particles fit together and, in turn, the resulting material. For the first time, a team observed the self-assembly of nanoparticles with tetrahedral shapes.

    Tracing Interstellar Dust Back to the Solar System's Formation

    Tracing Interstellar Dust Back to the Solar System's Formation

    This study is the first to confirm dust particles pre-dating the formation of our solar system. Further study of these materials will enable a deeper understanding of the processes that formed and have since altered them.

    Investigating Materials that Can Go the Distance in Fusion Reactors

    Investigating Materials that Can Go the Distance in Fusion Reactors

    Future fusion reactors will require materials that can withstand extreme operating conditions, including being bombarded by high-energy neutrons at high temperatures. Scientists recently irradiated titanium diboride (TiB2) in the High Flux Isotope Reactor (HFIR) to better understand the effects of fusion neutrons on performance.

    Better 3-D Imaging of Tumors in the Breast with Less Radiation

    Better 3-D Imaging of Tumors in the Breast with Less Radiation

    In breast cancer screening, an imaging technique based on nuclear medicine is currently being used as a successful secondary screening tool alongside mammography to improve the accuracy of the diagnosis. Now, a team is hoping to improve this imaging technique.

    Microbes are Metabolic Specialists

    Microbes are Metabolic Specialists

    Scientists can use genetic information to measure if microbes in the environment can perform specific ecological roles. Researchers recently analyzed the genomes of over 6,000 microbial species.


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