Now showing items 1-20 of 148

  • Abiotic ozone and oxygen in atmospheres similar to prebiotic earth 

    Domagal-Goldman, S.D.; Segura, A.; Claire, M.W.; Robinson, T.D.; Meadows, V.S. (2014-09-10) - Journal article
    The search for life on planets outside our solar system will use spectroscopic identification of atmospheric biosignatures. The most robust remotely detectable potential biosignature is considered to be the detection of ...
  • Absence of molybdenum isotope fractionation during magmatic differentiation at Hekla volcano, Iceland 

    Yang, J.; Siebert, C.; Barling, J.; Savage, P.; Liang, Y.-H.; Halliday, A.N. (2015-08-01) - Journal article
    This study investigates the behaviour of molybdenum (Mo) isotopes during magmatic differentiation. Molybdenum isotope compositions, as well as concentrations of rare earth elements and a selection of trace elements, have ...
  • Andean grasslands are as productive as tropical cloud forests 

    Oliveras, I.; Girardin, C.; Doughty, C. E.; Cahuana, N.; Arenas, C. E.; Oliver, V.; Huasco, W. Huaraca; Malhi, Y. (2014-11) - Journal article
    We aim to assess net primary productivity (NPP) and carbon cycling in Andean tropical alpine grasslands (puna) and compare it with NPP of tropical montane cloud forests. We ask the following questions: (1) how do NPP and ...
  • Antarctic sea ice control on ocean circulation in present and glacial climates 

    Ferrari, Raffaele; Jansen, Malte F.; Adkins, Jess F.; Burke, Andrea; Stewart, Andrew L.; Thompson, Andrew F. (2014-06-17) - Journal article
    In the modern climate, the ocean below 2 km is mainly filled by waters sinking into the abyss around Antarctica and in the North Atlantic. Paleoproxies indicate that waters of North Atlantic origin were instead absent below ...
  • Anticlockwise P-T evolution at ∼280 Ma recorded from ultrahigh-temperature metapelitic granulite in the Chinese Altai orogenic belt, a possible link with the Tarim mantle plume? 

    Tong, Laixi; Xu, Yi-Gang; Cawood, Peter A.; Zhou, Xin; Chen, Yibing; Liu, Zhao (2014-11) - Journal article
    An ultrahigh-temperature (UHT) metapelitic granulite assemblage consisting of garnet(g)–spinel(sp)–orthopyroxene(opx)-sillimanite(sil)–cordierite(cd)–ilmenite(ilm)–biotite(bi)–plagioclase(pl)–quartz(q) occurs within ...
  • Apparent OSL ages of modern deposits from Fåbergstølsdalen, Norway : implications for sampling glacial sediments 

    King, Georgina; Robinson, Ruth Alison Joyce; Finch, Adrian Anthony (2013-10-16) - Journal article
    The application of optically stimulated luminescence (OSL) dating within glacial settings can be limited where sediments have not had their OSL signal fully reset by sunlight exposure. Heterogeneous bleaching can result ...
  • Ardnamurchan 3D cone-sheet architecture explained by a single elongate magma chamber 

    Burchardt, Steffi; Troll, Valentin R.; Mathieu, Lucie; Emeleus, Henry C.; Donaldson, Colin Henry (2013-10-08) - Journal article
    The Palaeogene Ardnamurchan central igneous complex, NW Scotland, was a defining place for the development of the classic concepts of cone-sheet and ring-dyke emplacement and has thus fundamentally influenced our thinking ...
  • Are inventory based and remotely sensed above-ground biomass estimates consistent? 

    Hill, Timothy Charles; Williams, Mathew; Bloom, A. Anthony; Mitchard, Edward; Ryan, Casey (2013-09-19) - Journal article
    Carbon emissions resulting from deforestation and forest degradation are poorly known at local, national and global scales. In part, this lack of knowledge results from uncertain above-ground biomass estimates. It is ...
  • Assembly of the Lhasa and Qiangtang terranes in central Tibet by divergent double subduction 

    Zhu, Di-Cheng; Li, Shi-Min; Cawood, Peter A.; Wang, Qing; Zhao, Zhi-Dan; Liu, Sheng-Ao; Wang, Li-Quan (2015) - Journal article
    Integration of lithostratigraphic, magmatic, and metamorphic data from the Lhasa-Qiangtang collision zone in central Tibet (including the Bangong suture zone and adjacent regions of the Lhasa and Qiangtang terranes) indicates ...
  • The Astrobiology Primer v2.0 

    Domagal-Goldman, Shawn D.; Wright, Katherine E.; Adamala, Katarzyna; De La Rubia, Leigh Arina; Bond, Jade; Dartnell, Lewis R.; Goldman, Aaron D.; Lynch, Kennda; Naud, Marie Eve; Paulino-Lima, Ivan G.; Singer, Kelsi; Walter-Antonio, Marina; Abrevaya, Ximena C.; Anderson, Rika; Arney, Giada; Atri, Dimitra; Azuá-Bustos, Armando; Bowman, Jeff S.; Brazelton, William J.; Brennecka, Gregory A.; Carns, Regina; Chopra, Aditya; Colangelo-Lillis, Jesse; Crockett, Christopher J.; De Marines, Julia; Frank, Elizabeth A.; Frantz, Carie; De La Fuente, Eduardo; Galante, Douglas; Glass, Jennifer; Gleeson, Damhnait; Glein, Christopher R.; Goldblatt, Colin; Horak, Rachel; Horodyskyj, Lev; Kaçar, Betül; Kereszturi, Akos; Knowles, Emily; Mayeur, Paul; McGlynn, Shawn; Miguel, Yamila; Montgomery, Michelle; Neish, Catherine; Noack, Lena; Rugheimer, Sarah; Stüeken, Eva E.; Tamez-Hidalgo, Paulina; Walker, Sara Imari; Wong, Teresa (2016-08-01) - Journal article
  • Atmospheric drying as the main driver of dramatic glacier wastage in the southern Indian Ocean 

    Favier, V.; Verfaillie, D.; Berthier, E.; Menegoz, M.; Jomelli, V.; Kay, J. E.; Ducret, L.; Malbéteau, Y.; Brunstein, D.; Gallée, H.; Park, Y. -H.; Rinterknecht, V. (2016-09-01) - Journal article
    The ongoing retreat of glaciers at southern sub-polar latitudes is particularly rapid and widespread. Akin to northern sub-polar latitudes, this retreat is generally assumed to be linked to warming. However, no long-term ...
  • Atmospheric origins of perchlorate on Mars and in the Atacama 

    Catling, D. C.; Claire, Mark; Zahnle, K. J.; Quinn, R. C.; Clark, B. C.; Hecht, M. H.; Kounaves, S. (2010) - Journal article
    Isotopic studies indicate that natural perchlorate is produced on Earth in arid environments by the oxidation of chlorine species through pathways involving ozone or its photochemical products. With this analogy, we propose ...
  • Boron isotope evidence for oceanic carbon dioxide leakage during the last deglaciation 

    Martínez-Botí, M A; Marino, G; Foster, G L; Ziveri, P; Henehan, M J; Rae, J W B; Mortyn, P G; Vance, D (2015-02-12) - Journal article
    Atmospheric CO2 fluctuations over glacial-interglacial cycles remain a major challenge to our understanding of the carbon cycle and the climate system. Leading hypotheses put forward to explain glacial-interglacial atmospheric ...
  • Causes of unrest at silicic calderas in the East African Rift: new constraints from InSAR and soil-gas chemistry at Aluto volcano, Ethiopia 

    Hutchison, William; Biggs, Juliet; Mather, Tamsin A.; Pyle, David M.; Lewi, Elias; Yirgu, Gezahegn; Caliro, Stefano; Chiodini, Giovanni; Clor, Laura E.; Fischer, Tobias P. (2016-08-06) - Journal article
    Restless silicic calderas present major geological hazards, and yet many also host significant untapped geothermal resources. In East Africa this poses a major challenge, although the calderas are largely unmonitored their ...
  • Challenging the sensitivity limits of paleomagnetism : magnetostratigraphy of weakly magnetized Guadalupian-Lopingian (Permian) limestone from Kyushu, Japan 

    Kirschvink, J.L.; Isozaki, Y.; Shibuya, H.; Otofuji, Y.-I.; Raub, T.D.; Hilburn, I.A.; Kasuya, T.; Yokoyama, M.; Bonifacie, M. (2015-01-15) - Journal article
    Despite their utility for bio- and chemostratigraphy, many carbonate platform sequences have been difficult to analyze using paleomagnetic techniques due to their extraordinarily weak natural remanent magnetizations (NRMs). ...
  • Channel and floodplain change analysis over a 100-year period : Lower Yuba River, California 

    Ghoshal, S.; James, L.A.; Singer, Michael B.; Aalto, R. (2010-07-19) - Journal article
    Hydraulic gold mining in the Sierra Nevada, California (1853–1884) displaced ~1.1 billion m3 of sediment from upland placer gravels that were deposited along piedmont rivers below dams where floods can remobilize them. ...
  • Chemical controls on incipient Mg-silicate crystallisation at 25oC : implications for early and late diagenesis 

    Tosca, Nick; Masterson, Andrew (2014-04) - Journal article
    Mg-silicate minerals (e.g., stevensite, kerolite, talc, sepiolite) play an important role in the construction of facies models in lacustrine and peri-marine environments because they are sensitive to changes in solution ...
  • Consistency of arsenic speciation in global tobacco products with implications for health and regulation 

    Campbell, Robert Charles James; Stephens, W; Meharg, Andrew (2014-12-11) - Journal article
    Background Tobacco smoke is a major risk to the health of its users and arsenic is among the components of smoke present at concentrations of toxicological concern. There are significant variations in human toxicity between ...
  • Constraining ecosystem processes from tower fluxes and atmospheric profiles 

    Hill, T. C.; Williams, M.; Woodward, F. I.; Moncrieff, J. B. (2011-07) - Journal article
    The planetary boundary layer (PBL) provides an important link between the scales and processes resolved by global atmospheric sampling/modeling and site-based flux measurements. The PBL is in direct contact with the land ...
  • Continental growth and the crustal record 

    Hawkesworth, Chris; Cawood, Peter; Dhuime, Bruno (2013-12-08) - Journal item
    The continental crust is the archive of Earth history. The spatial and temporal distribution of the Earth's record of rock units and events is heterogeneous with distinctive peaks and troughs in the distribution of ages ...