Dr. Sun Si

Dr. Sun Si

Dr. Sun Si

Postdoctoral Fellow

My research interest is using high-resolution techniques to investigate minerals from old sedimentary rocks to understand the biological processes and interactions between the geosphere and biosphere on the early Earth. Planetary-wide Precambrian banded iron formations (BIF) are my particular research interest because they are a collective result of fundamental changes on the early Earth’s surface environmental changes and the evolution of life. I mainly use electron microscopes, including scanning electron microscopes and transmission electron microscopes, as well as many other techniques such as synchrotron radiation based X –ray absorption spectroscopy, X-ray diffraction and geochemistry to characterize the mineralogical, crystallographic and geochemical features of the minerals in BIF to understand their genesis and to evaluate their potential in recording the ancient biological activities and atmospheric-oceanic environments. 

2241 5473

Selected Publications

  1. Sun, S., and Li, Y.-L. (2017) Microstructures, crystallography and geochemistry of magnetite in 2500 to 2200 million-year-old banded iron formations from South Africa, Western Australia and North China. Precambrian Research, 298, 292-305.
  2. Sun, S., and Li, Y.-L. (2017) Geneses and evolutions of iron-bearing minerals in banded iron formations of  >3760 to ca. 2200 million-year-old: Constraints from electron microscopic, X-ray diffraction and Mössbauer spectroscopic investigations. Precambrian Research, 289, 1-17.
  3. Sun, S., Konhauser, K.O., Kappler, A., and Li, Y.-L. (2015) Primary hematite in Neoarchean to Paleoproterozoic oceans. Geological Society of America Bulletin, 127(5-6), 850-861.
  4. Sun, S., Chan, L.S., and Li, Y.-L. (2014) Flower-like apatite recording microbial processes through deep geological time and its implication to the search for mineral records of life on Mars. American Mineralogist, 99(10), 2116-2125.
  5. Li, Y.-L., Sun, S., and Chan, L.S. (2013) Phosphogenesis in the 2460 and 2728 million-year-old banded iron formations as evidence for biological cycling of phosphate in the early biosphere. Ecology and Evolution, 3(1), 115-125.