Unravelling abiogenic and biogenic sources of methane in the Earth's deep subsurface Sherwood Lollar, B. ; Lacrampe-Couloume, G. ; Slater, G. F. ; Ward, J. ; Moser, D. P. ; Gihring, T. M. ; Lin, L. -H. ; Onstott, T. C. Abstract Publication: Chemical Geology Pub Date: February 2006 DOI: 10.1016/j.chemgeo.2005.09.027 Bibcode: 2006ChGeo.226..328S