Radiogenic Isotope Lab.





Journal articles since 2000



RF Denniston et al , 2016, Expansion and contraction of the Indo-Pacific tropical rain belt over the last three millennia..Scientific Reports 6    PDF copy of paper

L M. Baldini J Baldini,  J N McElwaine A B Frappier, Y Asmerom et al., 2016, Persistent northward North Atlantic tropical cyclone track migration over the past five centuries; Scientific Reports 6      PDF copy of paper  

DD Decker, VJ Polyak, Y Asmerom, 2016, Depth and timing of calcite spar and “spar cave” genesis: Implications for landscape evolution studies; Geological Society of America Special Papers 516, 103-111.

AL Pollock, PE van Beynen, KL DeLong, V Polyak, Y Asmerom, ... 2016, A mid-Holocene paleoprecipitation record from Belize: Palaeogeography, Palaeoclimatology, Palaeoecology 463, 103-111     PDF copy of paper

VJ Polyak, PP Provencio, Y Asmerom, 2016, U-Pb dating of speleogenetic dolomite: A new sulfuric acid speleogenesis chronometer: International Journal of Speleology 45 (2), 1   PDF copy of paper

FA Lechleitner,  et al., 2016, Hydrological and climatological controls on radiocarbon concentrations in a tropical stalagmite: Geochimica et Cosmochimica Acta 194, 233-252.  PDF copy of paper

BP Theiling, M Elrick, Y Asmerom, 2016, Constraining the timing and provenance of trans-Laurentian transport using Nd and Sm isotopes from Silurian and Devonian marine carbonates:  Palaeogeography, Palaeoclimatology, Palaeoecology 2016  PDF copy of paper


HE Ridley, Y Asmerom, JUL Baldini et al., 2015, Aerosol forcing of the position of the intertropical convergence zone since ad 1550: Nature Geoscience 8 195-200. PDF copy of paper

DD Decker, VJ Polyak, Y Asmerom, 2015, Depth and timing of calcite spar and" spar cave" genesis: Implications for landscape evolution studies: GSA Special Papers 516, SPE516-08

İ Baykara, SM Mentzer, MC Stiner, Y Asmerom, ES Güleç, SL Kuhn, 2015,The Middle Paleolithic occupations of Üçağızlı II Cave (Hatay, Turkey): Geoarcheological and archeological perspectives: J. of Archaeological Science: Reports 4, 409-426

Chatters, J., Kennett, D. Asmerom et al. 2014, Late Pleistocene Human Skeleton and mtDNA Links Paleoamericans and Modern Native Americans: Science 344 (6185), 750-754.   PDF copy of paper

Lachniet, M., Denniston, R., Asmerom, Y., Polyak, V., 2014, Orbital control of western North Americaatmospheric circulation and climate over two glacial cycles:  Nature communications 5.  PDF copy of paper

SK Swanson, MA Muldoon, V Polyak, Y Asmerom, 2014, Evaluating shallow flow-system response to climate change through analysis of spring deposits in southwestern Wisconsin, USA Hydrogeology Journal 22 (4), 851-863

R Crow, K Karlstrom, A Darling, L Crossey, V Polyak, D Granger, Y. Asmerom, B. Schmandt..., 2014, Steady incision of Grand Canyon at the million year timeframe: A case for mantle-driven differential uplift: Earth and Planetary Science Letters 397, 159-173

A Aslan, WC Hood, KE Karlstrom, E Kirby, DE Granger, S Kelley, R Crow, M Donahue, V Polyak, Y Asmerom..., 2014, Abandonment of Unaweep Canyon (1.4–0.8 Ma), western Colorado: Effects of stream capture and anomalously rapid Pleistocene river incision: Geosphere 10 (3), 428-446

S Melgaard, D Seletskiy, V Polyak, Y Asmerom, M Sheik-Bahae, 2014, Identification of parasitic losses in Yb: YLF and prospects for optical refrigeration down to 80K: Optics express 22 (7), 7756-7764

LJ Preston, LA Melim, VJ Polyak, Y Asmerom, G Southam, 2014, Infrared Spectroscopic Biosignatures from Hidden Cave, New Mexico: Possible Applications for Remote Life Detection: Geomicrobiology Journal, 00-00

A Priewisch, LJ Crossey, KE Karlstrom, VJ Polyak, Y Asmerom, 2014, U-series geochronology of large-volume Quaternary travertine deposits of the southeastern Colorado Plateau: Evaluating episodicity and tectonic and paleohydrologic controls: Geosphere 10 (2), 401-423

J. Ricketts, K. Karlstrom, A. Priewisch, L. Crossey, V. Polyak, Y. Asmerom (2014) Quaternary extension in the Rio Grande rift at elevated strain rates recorded in travertine deposits, central New Mexico: Lithosphere 6 (1), 3-16.

Asmerom, Y., Polyaka, V., Rasmussen, J., Burns, S., and Lachniet, M., 2013, Multidecadal to multicentury scale collapses of
Northern Hemisphere monsoons over the past millennium: PNAS 110 (24) 9651-9656. PDF copy of paper

Agee, C., Wilson, N., McCubbin, F., Ziegler, K., Polyak, V., Nunn, M., Elardo, S., Sharp, Z., Asmerom, Y., Thiemens, M., Fogel, M., Steele, A., 2013, Unique Meteorite from the Early Amazonian Epoch on Mars: Water-rich Basaltic Breccia Northwest Africa 7034; Science Science 339, 780-785. PDF copy of paper

Lachniet, M., Asmerom, Y., Bernal, J., Polyak, V., Vazquez-Selem, L., 2013,Orbital pacing and ocean circulation-induced collapses of the Mesoamerican monsoon over the past 22,000 y: PNAS 2013 110 (23) 9255-9260 PDF copy of paper

Denniston, R, Wyrwoll, K., Asmeromc, Y., Polyak, V., Humphreys, W., Cugley, J., Woods, D., LaPointe, Z., Peota, J., Grea, E., 2013,North Atlantic forcing of millennial-scale Indo-Australian monsoon
dynamics during the Last Glacial period: Quaternary Science Reviews 72 (2013) 159-168 PDF copy of paper

Zachary Lundeena, Z., Brunelle, A., Burns, S., Polyak, V, and Asmerom, Y., 2013, A speleothem record of Holocene paleoclimate from the northern Wasatch Mountains, southeast Idaho, USA: Quaternary International 310, 83–95. PDF copy of paper

Dennistona, R., Asmerom, Y. Lachnietc, M., Polyak, V., Hope, P., An, N., , Rodzinyak, K., Humphreys, W., 2013, A Last Glacial Maximum through middle Holocene stalagmite record of coastal Western Australia climate: Quaternary Science Reviews 77, 101–112. PDF copy of paper

Cheng, H., R. L. awrence Edwards, R. L., Shen, C., Polyak, V., Asmerom, Y., Woodhead, J., Hellstrom, J., Wang, Y., Kong, X., Spötl, C., Wang, X., Alexander Jr., C., 2013, Improvements in 230Th dating, 230Th and 234U half-life values, and U–Th isotopic measurements by multi-collector inductively coupled plasma mass spectrometry: Earth and Planetary Science Letters 371–372, 82–91. PDF copy of paper

Polk, J., van Beynen, P., Asmerom, Y., Polyak, V., 2013, Reconstructing Past Climates using Carbon Isotopes from Fulvic Acids in Cave Sediments: Chemical Geology, in press PDF copy of paper

Kennett, D., Breitenbach, S., Aquino, V,  Asmerom, Y., et al., 2012, Development and Disintegration of Maya Political Systems in Response to Climate Change: Science 338, 788-791.
PDF copy of paper

Lachniet, M.S., Bernal, J.P., Asmerom, Y., Polyak, V., 2012, Uranium loss and aragonite-calcite age discordance in a calcitized aragonite stalagmite. Quaternary Geochronology 14 26-37.
PDF copy of paper
Breitenbach S. F. M., Rehfeld, K., Goswami B., Baldini J. U. L., Ridley H. E., Kennett D., Prufer K., Aquino V. V., Asmerom Y., Polyak V. J., Cheng H., Kurths J., Marwan N., 2012, COnstructing Proxy-Record Age models (COPRA). Climate of the Past 8, 1765–1779. PDF copy of paper

Polyak, V.J., Asmerom, Y., Burns, S.J., and Lachniet, M.S., 2012, The climatic backdrop to the terminal Pleistocene extinction of North American mammals, Geology40, 1023-1026.
PDF copy of paper
Lachniet, M.S., Bernal, J.P., Asmerom, Y., Polyak, V., and Piperno, D., 2012, A 2400 yr Mesoamerican rainfall reconstruction links climate and cultural change, Geology, 40, 259-262.
PDF copy of paper
Bethany P. Theiling, B.P., Elrick, M., Asmerom, Y.,  2012 Increased continental weathering flux during orbital-scale sea-level highstands: Evidence from Nd and O isotope trends in Middle Pennsylvanian cyclic carbonates. Paleogeography, Paleoclimatology, Paleoecology 342-343 17-26 PDF copy of paper

Lachniet, M., Asmerom, Y. and Polyak, V., 2012, Response to the correspondence article by Winograd on  “Deglacial paleoclimate in the southwestern United States: an abrupt 18.6 cold event and evidence for a North Atlantic forcing of Termination I”:  Quaternary  Science Review, 45, 129-133.

Mitchell, E. and Asmerom, Y., 2011,  U-series isotope systematics of mafic magmas from central Oregon: Implications for fluid involvement and melting processes in the Cascade arc: Earth and Planetary Science Letters, Vol. 312, 378-389. PDF copy of paper
Crow, R., Karlstrom, K., Asmerom, Y., Schmandt, B., Polyak, V., & DuFrane, S. A. (2011). Shrinking of the colorado plateau via lithospheric mantle erosion; evidence from nd and sr isotopes and geochronology of neogene basalts. Geology 39, 27-30. PDF copy of paper

Lachniet, M.S., Asmerom, Y., and Polyak, V., 2011, North Atlantic forcing of the last deglaciation in the southwestern United States: Quaternary Science Reviews, v. 30, p. 3803-3811.
PDF copy of paper

Gaffney, Amy M.; Borg, Lars E.; Asmerom, Yemane; Shearer, Charles K.; Burger, Paul V., 2011, Disturbance of isotope systematics during experimental shock and thermal metamorphism of a lunar basalt with implications for Martian meteorite chronology: Meteoritics & Planetary Science, 46, 35-52.

Asmerom, Y., Polyak, V. and Burns, S., 2010, Variable winter moisture in the southwestern United States linked to rapid glacial climate shifts:
Nature  Geoscience, 3(2), 114-117. PDF copy of paper

Medina-Elizalde, M., Burns, S. J., Lea, D. W., Asmerom, Y., von Gunten, L., Polyak, V.,  2010,  High resolution stalagmite climate record from the yucatan peninsula spanning the maya terminal classic period. Earth and Planetary Science Letters, 298(1-2), 255-262. PDF copy of paper

Edmunson, J., Borg, L.,E., Nyquist, L.E. and Asmerom, Y., 2009,  A combined Sm-Nd, Rb-Sr, and U-Pb isotopic study of Mg-suite norite 78238: Further evidence for early differentiation of the Moon: Cosmochimica Acta 73, 514-527 PDF copy of paper

Mercader, J., Asmerom, Y., Raja, M., and Skinner, A., 2009, Excavation and Dating of Ngalue Cave: A Middle Stone Age Site along the Niassa Rift, Mozambique: Journal of Human Evolution 57, 63-74.
PDF copy of paper
Asmerom, Y., 2008, Speleothems: Encyclopedia of Paleoclimatology and Ancient Environments, 916-918.

Polyak, V., Hill, C. and Asmerom, Y., 2008, Age and evolution of the Grand Canyon revealed by U-Pb dating of water table-type speleothems: Science 319, 1377-1380.
PDF copy of paper

Denniston, R.F., Asmerom, Y., Polyak, V., McNeill, D.F., Klaus, J.S., Cole, P., and Budd, A.F. 2008, Caribbean Chronostratigraphy Refined with U-Pb Dating of a Miocene Coral. Geology, 36, 151-154.

PDF copy of paper

Polyak, V. J; Hill,  Carol; Asmerom, Yemane, 2008, Response to Comments on the "Age and Evolution of the Grand Canyon  Revealed by U-Pb Dating of Water Table–Type Speleothems": Science, 321, 1634.

              Asmerom, Y., U-series  dating, 2008, Encyclopedia of Paleoclimatology and Ancient  Environments  968-971.

Asmerom, Y., Polyak, V., Burns, S., Rassmussen, J., 2007, Solar forcing of Holocene climate: New insights from a speleothem record, southwesternUSA, Geology, 35:1-4.
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van Beynen, P.E., Asmerom, Y., Polyak, V., Soto, L., and Polk, J.S., 2007, Variable intensity of teleconnections during the late Holocene in subtropical North America from an isotopic study of speleothem from Florida, Geophysical Research Letters, 34, L18703, doi:10.1029/2007GL031046.
PDF copy of paper

Denniston, R.F., DuPree, M., Dorale, J.A., Asmerom, Y., Polyak, V.J., and Carpenter, S.J., 2007, Episodes of late Holocene aridity recorded by stalagmites from Devil’s Icebox Cave, central Missouri, USA, Quaternary Research, 68: 45-52. PDF copy of paper

Gaffney, A., Borg, L., and Asmerom, Y., 2007, U-Pb systematics in mare basalt source regions: a combined U-Pb, Rb-Sr and Sm-Nd study of mare basalt 10017: Geochimica et Cosmochimica Acta: vol. 71, no. 14, pp.3656-3671. PDF copy of paper

Smith, J.R., Hawkins, A.L., Asmerom, Y., Polyak, V., and Giegengack, R., 2007, New age constraints on the Middle Stone Age occupations of Kharga Oasis, Western Desert, Egypt, Journal of Human Evolution, 52: 690-701. PDF copy of paper

Denniston, R.F., Asmerom, Y., Polyak, V., Dorale, J.A., Carpenter, S.J., Trodick, C., Hoye, B., and Gonzalez, L., 2007, Synchronous millennial-scale climatic changes in the Great Basin and the North Atlantic during the last interglacial, Geology, 35: 619-622.
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Lachniet, M.S.,  W. P. Patterson, S. Burns, Y. Asmerom and V. Polyak, 2007, Caribbean and Pacific moisture sources on the Isthmus of Panama revealed from surface water and stalagmite δ18O gradients: Geophysical Research ,34, L01708, doi:10.1029/2006GL028469. PDF copy of paper

Hogan, J., Phillips, F., Mills, S., Hendrickx, J., Ruiz, J. Chesley, J., Asmerom, Y.,2007, Geologic origins of salinization in a semi-arid river; the role of sedimentary basin brines: Geology,35: 1063-1066.

DuFrane, S.A., Asmerom, Y., Mukasa, S.B., Morris, J.A., Dreyer, B., 2006, Subduction and melting processes inferred from U-Series, Sr-Nd-Pb isotope, and trace element data, Bataan and Bicol arcs, Philippines: Geochimica et Cosmochimica Acta 70 (2006) 3401–3420. PDF copy of paper

Rasmussen, J., Polyak, V. and Asmerom, Y., 2006, Evidence for Pacific-modulated precipitation variability during the late Holocene from the southwestern USA: Geophysical Research Letters 33, L08701, doi:10.1029/2006GL025714 PDF copy of paper

Asmerom, Y., DuFrane, A., Mukasa, S., Cheng, H., Edwards, L., 2005,Time-scale of magma differentiation in arcs from protactinium radium data: Geology  33,  633–636; doi: 10.1130/G21638.1
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Polyak, V. and Asmerom, Y., 2005, Orbital control of long-term moisture in the southwestern USA: Geophysical Research Letters 32, L19709, doi:10.1029/2005GL023919.

Borg, L. E., Edmunson, J. E., and Asmerom, Y., 2005, Constraints on the U-Pb isotopic systematics of Mars inferred from a combined U-Pb, Rb-Sr, and Sm-Nd isotopic study of the Martian meteorite Zagami, Geochimica et Cosmochimica Acta 69, 5819–5830 PDF copy of paper

Teklay, M., Asmerom, Y., Toulkerdist, T., 2005, Geochemical and Sr.Nd isotope ratios in cenozoic basalts from Eritrea: evidence for temporal evolution from low-Ti tholeiitic to high-Ti alkaline basalts in Afro-Arabian continental flood basalt province: Periodico di mineralogia 74, 167 – 182.

Asmerom, Y. and Polyak, V., 2004, Comment on Betancourt et al. (2002) “A test of annual resolution in stalagmites using tree rings.”: Quaternary Research 61, 119-121.

Polyak, V., Rasmussen, J., Asmerom, Y., 2004, Prolonged wet period in the southwestern United States through the Younger Dryas: Geology 32, 5-8.

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Borg, L.,  Shearer, C., Asmerom, Y. and Papike, J., 2004, Evidence for Prolonged KREEP Magmatism on the Moon from the Youngest Dated Lunar Igneous Rock: Nature, 432, 209-211.
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Lachniet, M.S., Asmerom, Y., Burns, S., Patterson, W.P., Polyak, V. and Seltzer, G.O., 2004, Tropical Response to the 8200 yr cold event? Speleothem isotopes indicate a weakened early Holocene monsoon in Costa Rica. Geology 32, 957-960. PDF copy of paper

Lachniet, M.S., Burns, S.J., Piperno, D.R., Asmerom, Y., Polyak, V.J., Moy, C.M. and Christenson, K., 2004, A 1500 year El Niño/Southern Oscillation and rainfall history for the Isthmus of Panama from speleothem calcite. Journal of Geophysical Research, D, Atmospheres109, D20117, doi:10.1029/2004JD004694.

Patrick J. Mickler, P.J., Banner,J.L., Stern, L., Asmerom, Y., Edwards, R.L., and Ito, E., 2004, Stable isotope variations in modern tropical speleothems: Evaluating applications to paleoenvironmental reconstructions. Geochimica et Cosmochimica Acta 68, 4381-4393.

Polyak, V. J. and Asmerom, Y. 2001.  Late Holocene climate and cultural changes in the Southwestern United States, Science, 294: 148-151.
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Asmerom, Y., Cheng, H., Thomas, R., and Hirschmann, M., Edwards, R.L., 2000, Lithospheric Mantle Melting Constrained by Pa-Th-U Isotopic Data: Nature 406, 293-296.
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Polyak, V., Cokendolpher, J., Norton, R., and Asmerom, Y., 2001, A wetter and cooler Late Holocene climate in the southwestern USA from mites preserved in stalagmites: Geology 29, 643-646

Getty, S., Asmerom, Y., Quinn, T., and Budd, A., 2001, Accelerated Pleistocene Coral Extinctions in the Caribbean Basin from Uranium-Lead (U-Pb) Dating: Geology, 29, 639-642.

Teklay, M., T. Haile, A. Kröner, Y. Asmerom, and J. Watson, 2003, A back-arc palaeotectonic setting for the Augaro Neoproterozoic magmatic rocks of western Eritrea: Gondwana Research 6, 629-640.

Denniston, R.F., González, L.A., Asmerom, Y., and Reagan, M.K., 2001, A high-resolution speleothem record of climatic variability during the Allerød-Younger Dryas transition in Missouri, central United States: Palaeogeography, Palaeoclimatology, Palaeoecology, 176 147-155.

Zachau, T., Getty, S., Gries, C., Asmerom, Y., Zambrano, A. and Nash, T., 2003, Historical and current atmospheric deposition to the epilithic lichen Xanthoparmelia in Maricopa County, Arizona: Environmental Pollution 125, 21-30.

Grandia F, Asmerom Y, Getty S, Cardellach E, Canals A, 2000, U-Pb dating of MVT ore-stage calcite: implications for fluid flow in a Mesozoic extensional basin from Iberian Peninsula: Journal of Geochemical Exploration,  69,  377-380, 2000.

Teklay, M., Berhe, K., Reimold, W., Armstrong, R., Asmerom, Y.,  and Watson, J.,  2002,  Geochemistry and geochronology of a Neoproterozoic low-K tholeiite-boninite association in Central Eritrea: Gondwana Research, 5, 597-612.

Denniston, R.F., González, L.A., Asmerom, Y., and Reagan, M.K., 2000, Speleothem records of early and late Holocene vegetation dynamics in the Ozark  Highlands, U.S.A.: Quaternary International , v. 67 pp. 21-27.

Cheng, H., Edwards, R.L., Hoff, J., Gallup, C.D., Richards, D.A., and Asmerom, Y., 2000, The half-lives of uranium-234 and thorium-230: Chemical Geology, 169, 17-33.

Denniston, R.F., González, L.A., Asmerom, Y., Sharma, R.H., and Reagan, M.K, 2000, Speleothem evidence for changes in Indian summer monsoon precipitation over the last 2300 years: Quaternary Research 53, 196-202.