Papers

Carlson RW, Boyet M, Horan MF (2007)   Chondrite barium, neodymium and samarium isotopic heterogeneity and early earth differentiation.   Science 316:1175.

Luguet, A, Shirey SB, Lorand J-P, Horan MF, Carlson RW (2007)   Residual platinum group minerals from highly depleted harzburgites of the Lherz massif (France) and their role in HSE fractionation of the mantle.   Geochim. Cosmochim. Acta 71:3082-3097.

Schönbächler Maria, Richard W. Carlson, Mary F. Horan, Timothy D. Mock, Erik H Hauri, (2007)   High precision Ag isotope measurements in geologic materials by multiple-collector ICP-MS:  An evaluation of dry versus wet plasma.    International Journal of Mass Spectrometry 261:183-191.

Becker, H., M. F. Horan, R. J. Walker, S. Gao, J.-P. Lorand, and R. L. Rudnick (2006)   Highly siderophile element composition of the Earth's primitive upper mantle:  constraints from new data on peridotite massifs and xenoliths,   Geochim. Cosmochim. Acta 70, 4528-4550.

Hulbert LH, Hamilton MA, Horan MF, Scoates RFJ, (2005)   U-Pb and Re-Os isotope geochronology of mineralized ultramafic intrusion and associated nickel ores from the Thompson Nickel Belt, Manitoba, Canada.   Econ. Geology.

Walker RJ, Horan MF, Shearer CK, Papkie JJ (2004)   Low abundances of highly siderophile elements in the lunar mantle:   evidence for prolonged late accretion.   Earth Planet. Sci. Lett. 224:399-413.

McDaniel DK, Walker RJ, Hemming SR, Horan MF, Becker H, Grauch RI (2004) Sources of osmium to the modern oceans:   new evidence from the ¹⁹⁰Pt-¹⁸⁶ Os system.   Geochim. Cosmochim. Acta 68:1243-1252.

Cook DL, Walker RJ, Horan MF, Wasson JT, Morgan JW (2004)   Pt-Re-Os systematics of group IIAB and IIIAB iron meteorites.   Geochim. Cosmochim Acta. 68:1413-1431.

Horan M.F., R.J. Walker, J.W. Morgan, J.N. Grossman, A.E. Rubin (2003) Highly siderophile elements in chondrites.   Chemical Geology 66:4187-4201.

Morgan John W., Richard J. Walker, Mary F. Horan, Ellyn S. Beary and Anthony J. Naldrett   (2002) ¹⁹⁰Pt-¹⁸⁶ Os and ¹⁸⁷Re-¹⁸⁷ Os systematics of the Sudbury Igneous Complex, Ontario.   Geochimica Cosmochimica Acta 66: 273-290

Walker RJ, Horan MF, Morgan JW, Becker H, Grossman JN, Rubin AE (2002)   Comparative ¹⁸⁷Re-¹⁸⁷ Os systematics of chondrites:   implications regarding early solar system processes.   Geochim Cosmochim Acta   66:4187-4201.

Horan MF, Morgan JW Walker RJ, Cooper RW (2001) Re-Os isotopic constraints on magma mixing in the peridotite Zone of the Stillwater Complex, Montana USA.   Contrib. Min. Pet.   141:446-457.

Morgan J.W., Walker R.J., Brandon A.D. and Horan M.F. (2001) Siderophile elements in Earth's upper mantle and lunar breccias: Data synthesis suggests manifestations of the same late influx. Meteoritics and Planetary Science 36 , 1257-1275.

Böhlke JK, Horan MF (2000)   Strontium isotope geochemistry of groundwaters and streams affected by agriculture, Locust Grove MD.   App. Geochem.   15:599-609.

Helz GR, Adelson JM, Miller CV, Cornwell JC, Hill JM, Horan MF, Walker RJ   (2000)   Osmium isotopes demonstrate distal transport of contaminated sediments in Chesapeake Bay.   Environ. Sci Tech.   34:2528-2534.

Horan MF, Smoliar MI, Walker RJ (1998) ¹⁸²W and ¹⁸⁷Re-¹⁸⁷ Os systematics of iron meteorites:   chronology of melting, differentiation and crystallization in asteroids.   Geochim. Cosmochim. Acta   62:545-554.

Walker RJ, Morgan JW, Beary ES, Smoliar MI, Czamanske GK, Horan MF (1997)   Applications of the ¹⁹⁰Pt-¹⁸⁶ Os isotope system to geochemistry and cosmochemistry.   Geochim. Cosmochim. Acta 61:4799-4807.

Horan MF, Walker RJ, Fedorenko VA and Czamanske GK, (1995)   Osmium and neodymium isotopic constraints on the temporal and spatial evolution of Siberian flood basalt sources.   Geochim. Cosmochim. Acta 59:5159-5168.

Morgan JW, Horan MF,   Walker RJ, Grossman JN (1995)   Rhenium-osmium concentration and isotope systematics in group IIAB iron meteorites.   Geochim. Cosmochim. Acta 59:2331-2344.

Walker RJ, Morgan JW, Horan MF (1995)   Osmium-187 enrichment in some plumes:   evidence for core-mantle interaction.   Science 269:819-822.

Horan MF, Morgan JW, Grauch, RI, Coveney RM, Murowchick JB, Hulbert LJ (1994)   Rhenium and osmium isotopes in black shales and Ni-Mo-PGE-rich sulfide layers, Yukon Territory Canada and Hunan and Guizhou provinces, China.   Geochim. Cosmochim. Acta   58:257-265.

Walker RJ,   Morgan JW, Horan MF Czamanske GK, Krogstad EJ, Fedorenko VA, Kunilov VE (1994)   Re-Os isotopic evidence for an enriched-mantle source for the Noril'sk-type, ore-bearing intrusions, Siberia.   Geochim. Cosmochim. Acta   58:4179-4197.

Horan M.F., Morgan J.W., Walker R.J. and Grossman J.N.( 1992) Re-Os isotope constraints on the age of iron meteorites. Science 255, 1118-1121.

Walker R.J., Echeverría L.M., Shirey S.B. and Horan M.F. (1991) Re-Os isotopic constraints on the origin of volcanic rocks, Gorgona Island, Colombia: Os isotopic evidence for ancient heterogeneities in the mantle. Contrib. Mineral. Petrol. 107, 150-162.

Walker R.J., Shirey S.B., Hanson G.N., Rajamani V. and Horan M.F. (1989) Re-Os, Rb-Sr and O isotopic systematics of the Archean Kolar schist belt, Karnataka, India. Geochim. Cosmochim. Acta 53, 3005-3013.

Ayuso RA, Horan MF, Criss RE   (1988)    Pb and O isotopic geochemistry of granitic plutons in northern Maine.   Am J. Sci   288A:421-460.

Horan MF, Hanson GN, Spencer KJ (1987)   Pb and Nd isotope and trace elements constraints on the origin of basic rocks in an early Proterozoic igneous complex, Minnesota.   Precambrian Res.   37:323-342.

Recent Abstracts

M. Schönbächler, E. H. Hauri, R. W. Carlson, M. F. Horan   (2005) Ag isotope variations in the Earth .   Goldschmidt Conf. Abs.

M.F. Horan , R.J. Walker, C.K. Shearer , J.J. Papike (2004) Low abundances of highly siderophile elements in lunar mantle imply prolonged late accretion.   Goldschmidt Conf. Abs.

Luguet AA, Horan MF, Shirey SB, Lorand J-P, Carlson RW (2004)   Partitioning of highly siderophile elements in highly refractory peridotites.   Goldschmidt Conf. Abstract.

Smoliar MI, MF Horan, Alexander CMO'D, Walker RJ (2004)   Re-Os systematics and HSE distribution in Tieschitz (H3.6):   two isochrons for one meteorite.   Lunar Planet Sci Abs.

Walker RJ, Horan MF, Shearer CK, and Papike JJ (2004)   Low abundances of highly siderophile elements in the lunar mantle:   evidence for prolonged late accretion.   Lunar Planet Sci Abs.

Becker H, Horan MF, Walker RJ, Gao S, Lorand J-P, Rudnick RL,   (2004)   New constraints on the origin of the highly siderophile elements in the earth's upper mantle.   Lunar Planet Sci Abs.

Luguet AA, Horan MF, Shirey SB, Lorand J-P (2003)   Highly siderophile elements partitioning in partial melting residues :   a case study in some Pyrenean harzburgites (France).   Fall AGU Abstract.

Walker R. J., M.F. Horan, C. K. Shearer and J. J. Papike (2003).   Osmium isotope and highly siderophile elements compositions of lunar orange and green glasses.   LPSC abstract  

Smoliar MI, MF Horan, Alexander CMO'D, Walker RJ   (2003) Re-Os systematics and HSE distribution in metal from Ochansk (H4) chondrite.    Lunar Planet Sci Abs.

M.F. Horan, R.J. Walker, J.W. Morgan, J.N. Grossman (2001)   A comparison of Re-Os isotopes and the highly siderophile elements in chondritic meteorites: constraints on terrestrial accretion.   Fall AGU abstract

Horan MF, Walker RJ Rubin AE   (2001)   Highly siderophile elements in shocked and unshocked chondrites.   Lunar Planet Sci Abs.

Morgan JW, Walker RJ, Brandon AD, Horan MF (2001)   Late influx:   evidence from siderophile elements in earth's upper mantle and lunar breccias.   Lunar Planet Sci Abs.

Walker RJ, Horan MF, Morgan JW, Meisel T.   (2001)   Osmium isotopic compositions of chondrites and earth's primitive upper mantle:   constraints on the late veneer.   Lunar Planet Sci Abs.

Horan MF, Walker RJ   (2000)   Abundances of highly siderophile elements in chondrites.   Lunar Planet Sci Abs.