Ian D. Hutcheon

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The lead-lead isochron age of chondrules in the CR chondrite Acfer 059 is 4564.7 +/- 0.6 million years ago (Ma), whereas the lead isotopic age of calcium-aluminum-rich inclusions (CAIs) in the CV chondrite Efremovka is 4567.2 +/- 0.6 Ma. This gives an interval of 2.5 +/- 1.2 million years (My) between formation of the CV CAIs and the CR chondrules and(More)
Albert Galy,* Olga Yoffe, Philip E. Janney, Ross W. Williams, Christophe Cloquet, Olivier Alard, Ludwik Halicz, Meenakshi Wadhwa, Ian D. Hutcheon, Erick Ramon and Jean Carignan Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, UK CB2 3EQ. E-mail: albert00@esc.cam.ac.uk; Fax: 44 1223 333450; Tel: 44 1223 333404; Geological(More)
We report major element, H O, Cl, B, and Be analyses of matrix glass and olivine-hosted glass inclusions from two 2 Ž pillow lava samples dredged from 4200 m on the southern rift zone of Loihi seamount, Hawaii. Matrix glasses MgO;9 . wt.% have H O, Cl, and B contents considerably in excess of the values expected from mantle melting or fractional 2(More)
Many tholeiitic and transitional pillow-rim and fragmental glasses from Loihi seamount, Hawaii, have high Cl contents and Cl/K2O ratios (and ratios of Cl to other incompatible components, such as P2O5, H2O, etc.) relative to other Hawaiian subaerial volcanoes (e.g., Mauna Loa, Mauna Kea, and Kilauea). We suggest that this results from widespread(More)
To examine phylogenetic identity and metabolic activity of individual cells in complex microbial communities, we developed a method which combines rRNA-based in situ hybridization with stable isotope imaging based on nanometer-scale secondary-ion mass spectrometry (NanoSIMS). Fluorine or bromine atoms were introduced into cells via 16S rRNA-targeted probes,(More)
chondrules and other meteorites. The initial Al/Al ratios of well correlated isocrhons obtained from CAIs distributed mostly between (4-6) ×10 [3]. Other data for individual samples are from [4-16]. CONSTRAINTS ON THE ORIGIN OF CHONDRULES AND CAIS FROM SHORT-LIVED AND LONGLIVED RADIONUCLIDES. N. T. Kita , G. R. Huss, S. Tachibana, Y. Amelin, E. Zinner, L.(More)
Sphingolipids play important roles in plasma membrane structure and cell signaling. However, their lateral distribution in the plasma membrane is poorly understood. Here we quantitatively analyzed the sphingolipid organization on the entire dorsal surface of intact cells by mapping the distribution of (15)N-enriched ions from metabolically labeled(More)
Ion microprobe studies of hydrous amphibole, biotite, and apatite in shergottite-nakhlite-chassignite (SNC) meteorites, probable igneous rocks from Mars, indicate high deuterium/hydrogen (D/H) ratios relative to terrestrial values. The amphiboles contain roughly one-tentn as much water as expected, suggesting that SNC magmas were less hydrous than(More)
Filamentous nitrogen fixing cyanobacteria are key players in global nutrient cycling, but the relationship between CO2- and N2-fixation and intercellular exchange of these elements remains poorly understood in many genera. Using high-resolution nanometer-scale secondary ion mass spectrometry (NanoSIMS) in conjunction with enriched H13CO3− and 15N2(More)
Lateral variations in membrane composition are postulated to play a central role in many cellular events, but it has been difficult to probe membrane composition and organization on length scales of tens to hundreds of nanometers. We present a high-resolution imaging secondary ion mass spectrometry technique to reveal the lipid distribution within a(More)