1. Reply to Boslough: Is Greenland Pt anomaly global or local?

    PNAS 110(52):E5036 (2013) PMID 24511625 PMCID PMC3876271

  2. Reply to Boslough: Is Greenland Pt anomaly global or local?

    PNAS 110(52):E5036 (2013) PMID 24511625 PMCID PMC3876271

  3. Large Pt anomaly in the Greenland ice core points to a cataclysm at the onset of Younger Dryas.

    PNAS 110(32):12917 (2013) PMID 23878232 PMCID PMC3740870

    One explanation of the abrupt cooling episode known as the Younger Dryas (YD) is a cosmic impact or airburst at the YD boundary (YDB) that triggered cooling and resulted in other calamities, including the disappearance of the Clovis culture and the extinction of many large mammal species. We tes...
  4. Large Pt anomaly in the Greenland ice core points to a cataclysm at the onset of Younger Dryas.

    PNAS 110(32):12917 (2013) PMID 23878232 PMCID PMC3740870

    One explanation of the abrupt cooling episode known as the Younger Dryas (YD) is a cosmic impact or airburst at the YD boundary (YDB) that triggered cooling and resulted in other calamities, including the disappearance of the Clovis culture and the extinction of many large mammal species. We tes...
  5. Fe–Al-rich tridymite–hercynite xenoliths with positive cerium anomalies: preserved lateritic paleosols and implications for Miocene climate

    Chemical Geology 207(1):101 (2004)

    We report isotopic and chemical compositions of unusual tridymite–hercynite xenoliths in middle Miocene Niutoushan tholeiites from the southeast coastal area of China. These xenoliths are characterized by positive cerium (Ce) anomalies and extremely high Al 2O 3 (32–34 wt.%) and...
  6. Fe–Al-rich tridymite–hercynite xenoliths with positive cerium anomalies: preserved lateritic paleosols and implications for Miocene climate

    Chemical Geology 207(1):101 (2004)

    We report isotopic and chemical compositions of unusual tridymite–hercynite xenoliths in middle Miocene Niutoushan tholeiites from the southeast coastal area of China. These xenoliths are characterized by positive cerium (Ce) anomalies and extremely high Al 2O 3 (32–34 wt.%) and...
  7. Constraints on melt movement beneath the East Pacific Rise from 230Th-238U disequilibrium.

    Science 295(5552):107 (2002) PMID 11778043

    We report 230Th-238U disequilibrium data on mid-ocean ridge basalts recovered 5 to 40 kilometers off the ridge axis near 9 degrees 30'N of the East Pacific Rise. These data indicate near-symmetrical eruptions of normal mid-ocean ridge basalts (NMORBs) and incompatible element-enriched mid-ocean ...
  8. Constraints on melt movement beneath the East Pacific Rise from 230Th-238U disequilibrium.

    Science 295(5552):107 (2002) PMID 11778043

    We report 230Th-238U disequilibrium data on mid-ocean ridge basalts recovered 5 to 40 kilometers off the ridge axis near 9 degrees 30'N of the East Pacific Rise. These data indicate near-symmetrical eruptions of normal mid-ocean ridge basalts (NMORBs) and incompatible element-enriched mid-ocean ...
  9. Major, trace element, and Nd, Sr and Pb isotope studies of Cenozoic basalts in SE China: mantle sources, regional variations, and tectonic significance

    Chemical Geology 171(1):33 (2000)

    Major, trace element, and Nd–Sr–Pb isotopic compositions of mantle xenolith-bearing Cenozoic basalts in southeastern China are measured to provide an insight into the nature of their mantle sources and processes. Application of a modified dynamic melting inversion (DMI) method presented her...
  10. Theoretical studies of238U-230Th-226Ra and235U-231Pa disequilibria in young lavas produced by mantle melting

    Geochimica et Cosmochimica Acta 64(10):1809 (2000)

    This paper provides ready-to-use equations to describe variations in uranium-series (U-series) disequilibrium as a function of elemental distribution coefficients, melting porosity, melting rate, and melting time. The effects of these melting parameters on U-series disequilibria are quantit...
  11. Theoretical studies of238U-230Th-226Ra and235U-231Pa disequilibria in young lavas produced by mantle melting

    Geochimica et Cosmochimica Acta 64(10):1809 (2000)

    This paper provides ready-to-use equations to describe variations in uranium-series (U-series) disequilibrium as a function of elemental distribution coefficients, melting porosity, melting rate, and melting time. The effects of these melting parameters on U-series disequilibria are quantit...
  12. Major, trace element, and Nd, Sr and Pb isotope studies of Cenozoic basalts in SE China: mantle sources, regional variations, and tectonic significance

    Chemical Geology 171(1):33 (2000)

    Major, trace element, and Nd–Sr–Pb isotopic compositions of mantle xenolith-bearing Cenozoic basalts in southeastern China are measured to provide an insight into the nature of their mantle sources and processes. Application of a modified dynamic melting inversion (DMI) method presented her...
  13. Exploring the kappa conundrum: the role of recycling in the lead isotope evolution of the mantle

    Earth and Planetary Science Letters 169(1):129 (1999)

    It has long been known that the measured kappa ( 232Th/ 238U, or κ) of mid-ocean ridge basalts (MORB) and, by inference, the upper mantle, is much lower than the time-integrated κ recorded by Pb isotope ratios ( κ Pb). We examine models that can reconci...
  14. Exploring the kappa conundrum: the role of recycling in the lead isotope evolution of the mantle

    Earth and Planetary Science Letters 169(1):129 (1999)

    It has long been known that the measured kappa ( 232Th/ 238U, or κ) of mid-ocean ridge basalts (MORB) and, by inference, the upper mantle, is much lower than the time-integrated κ recorded by Pb isotope ratios ( κ Pb). We examine models that can reconci...
  15. Mantle fluids: Evidence from fluid inclusions

    Geochimica et Cosmochimica Acta 60(17):3229 (1996)

    A total dissolution technique has been developed and used to identify and quantify the incompatible element contents of fluids trapped in inclusions in minerals from peridotite xenoliths using “fluids” in the generic sense (i.e., COH fluids and melts). Fluids from lherzolites, a wehr...
  16. Mantle fluids: Evidence from fluid inclusions

    Geochimica et Cosmochimica Acta 60(17):3229 (1996)

    A total dissolution technique has been developed and used to identify and quantify the incompatible element contents of fluids trapped in inclusions in minerals from peridotite xenoliths using “fluids” in the generic sense (i.e., COH fluids and melts). Fluids from lherzolites, a wehr...
  17. A major and trace element and strontium, neodymium, and osmium isotopic study of a thick pyroxenite layer from the Beni Bousera Ultramafic Complex of northern Morocco

    Geochimica et Cosmochimica Acta 60(8):1429 (1996)

    Major and trace element concentrations and strontium, neodymium, and osmium isotopic compositions were determined for a series of samples from a thick, symmetrically zoned pyroxenite layer from the Beni Bousera massif. The two main rock types included in the layer, garnet pyroxenites and we...
  18. A major and trace element and strontium, neodymium, and osmium isotopic study of a thick pyroxenite layer from the Beni Bousera Ultramafic Complex of northern Morocco

    Geochimica et Cosmochimica Acta 60(8):1429 (1996)

    Major and trace element concentrations and strontium, neodymium, and osmium isotopic compositions were determined for a series of samples from a thick, symmetrically zoned pyroxenite layer from the Beni Bousera massif. The two main rock types included in the layer, garnet pyroxenites and we...
  19. Constraints on the degree of dynamic partial melting and source composition using concentration ratios in magmas

    Geochimica et Cosmochimica Acta 60(4):711 (1996)

    We present a dynamic melting inversion (DMI) method that permits calculation of the degree of partial melting for cogenetic primary magmas in the context of the dynamic melting model of Langmuir et al. (1977). The method uses variations of between-magma concentration ratios for two incompat...
  20. Constraints on the degree of dynamic partial melting and source composition using concentration ratios in magmas

    Geochimica et Cosmochimica Acta 60(4):711 (1996)

    We present a dynamic melting inversion (DMI) method that permits calculation of the degree of partial melting for cogenetic primary magmas in the context of the dynamic melting model of Langmuir et al. (1977). The method uses variations of between-magma concentration ratios for two incompat...