C. M. O'D Alexander

The LaPaz Icefield 04840 meteorite: Mineralogy, metamorphism, and origin of an amphibole- and biotite-bearing R chondrite (2008)

McCanta, M. C., Treiman, A. H., Dyar, M. D., Alexander, C. M. O'D., Rumble, D., Essene, E. J.

The R chondrite meteorite LaPaz Icefield (LAP) 04840 is unique among metamorphosed, non-carbonaceous chondrites in containing abundant OH-bearing silicate minerals: ~13% ferri-magnesiohornblende and...

Indigenous amino acids in primitive CR meteorites (2008)

Martins, Z., Alexander, C. M. O'D., Orzechowska, G. E., Fogel, M. L., Ehrenfreund, P.

CR meteorites are among the most primitive meteorites. In this paper, we report the first measurements of amino acids in Antarctic CR meteorites, two of which show the highest amino acid...

Were presolar grains destroyed by the nebula process responsible for the volatile element fractionation? (2008)

Davidson, J., Busemann, H., Alexander, C. M. O'D., Nittler, L. R., Hoppe, P., Franchi, I. A., ...

Secondary ion mass spectrometry and x-ray absorption near-edge structure spectroscopy of isotopically anomalous organic matter from CR1 chondrites GRO 95577 (2007)

Busemann, H., Zega, T. J., Alexander, C. M. O'D., Cody, G. D., Kilcoyne, A. L. D., Nittler, L. R., ...

We located interstellar organics from a CR1 chondrite with NanoSIMS and analyzed FIB-extracted sections with XANES. D-rich material appears not associated with a functional group, whereas 15N-rich...

On the asymptotic giant branch star origin of peculiar spinel grain OC2 (2007)

Lugaro, M., Karakas, A. I., Nittler, L. R., Alexander, C. M. O'D., Hoppe, P., Iliadis, C., ...

On the asymptotic giant branch star origin of peculiar spinel grain OC2 (2006)

Lugaro, M., Karakas, A. I., Nittler, L. R., Alexander, C. M. O'D., Hoppe, P., Iliadis, C., ...

Microscopic presolar grains extracted from primitive meteorites have extremely anomalous isotopic compositions revealing the stellar origin of these grains. The composition of presolar spinel grain...

Correlated analyses of D- and 15N-rich carbon grains from CR2 chondrite EET 92042 (2006)

Busemann, H., Alexander, C. M. O'D., Nittler, L. R., Zega, T. J., Stroud, R. M., Bajt, S., ...

Extract from introduction: Insoluble organic matter (IOM) and matrix from primitive carbonaceous chondrites carry isotope enrichments (δD≤20000‰, δ15N≤3200‰) that are comparable to those in...

Correlated analytical studies of organic material from the Tagish Lake carbonaceous chondrite (2006)

Zega, T. J., Stroud, R. M., Nittler, L. R., Busemann, H., Alexander, C. M. O'D.

We report on correlated studies of organic material using SIMS, FIB-SEM, and TEM.

Correlated Microscale Isotope and Scanning Transmission X-Ray Analyses of Isotopically Anomalous Organic Matter from the CR2 Chondrite EET 92042 (2006)

Busemann, H., Alexander, C. M. O'D., Nittler, L. R., Zega, T. J., Stroud, R. M., Cody, G. D., ...

We discuss correlated examinations of organic matter from the CR2 chondrite EET 92042, using SIMS, STXM and other methods. We found a large, isotopically highly anomalous region of probable presolar...

Extreme H isotopic anomalies in chondritic organic matter (2005)

Busemann, H., Alexander, C. M. O'D., Hoppe, P., Nittler, L. R., Young, A. F.

Extract from introduction: We have conducted ionprobe (IMS6f and NanoSIMS) imaging studies of various samples for H, D, C, 14N and 15N. These will ultimately be correlated with micro-analytic...

Extensive microscale N isotopic heterogeneity in chondritic organic matter (2005)

Nittler, L. R., Hoppe, P., Alexander, C. M. O'D., Busemann, H., Cody, G.

Introduction: H and N isotopic anomalies (mainly excesses of D and 15N) in organic matter from primitive meteorites and IDPs suggest preservation of presolar molecular cloud material [1-3]. However,...

Scanning micro-raman spectroscopy on carbon-rich residues of primitive chondrites: A tool for chondrite classification and stardust analysis (2005)

Busemann, H., Alexander, C. M. O'D., Fries, M., Nittler, L., Steele, A.

We present results obtained by Raman spectroscopy of various organic residues of primitive chondrites in order to better characterize the microstructural state of the organic matter. These results...

Isotopic fractionation of iron, potassium, and oxygen in stony cosmic spherules: Implications for heating histories and sources (2005)

Taylor, S., Alexander, C.M.O'D., Delaney, J., Ma, P., Herzog, G.F., Engrand, C.

Atmospheric heating alters the compositions and textures of micrometeorites. To understand the changes and to test a proposed relationship between a micrometeorite's petrographic texture and its...

Isotopic fractionation of iron, potassium, and oxygen in stony cosmic spherules: Implications for heating histories and sources (2005)

Taylor, S., Alexander, C.M.O'D., Delaney, J., Ma, P., Herzog, G.F., Engrand, C.

Atmospheric heating alters the compositions and textures of micrometeorites. To understand the changes and to test a proposed relationship between a micrometeorite's petrographic texture and its...

A NanoSIMS study of titanium-isotopic compositions of presolar corundum grains (2003)

Hoppe, P., Nittler, L. R., Mostefaoui, S., Alexander, C. M. O'D., Marhas, K. K.

The matrices and rims of unequilibrated ordinary chondrites :--origins, metamorphism and alteration /--by C. M. O'D. Alexander. (1987)

Alexander, C. M. O'D.

Thesis [Ph. D.]--University of Essex, 1987.