TY - JOUR
T1 - Ferric iron content of mineral inclusions in diamonds from Sao Luiz
T2 - A view into the lower mantle
AU - McCammon, Catherine
AU - Hutchison, Mark
AU - Harris, Jeff
PY - 1997/10/17
Y1 - 1997/10/17
N2 - Mossbauer spectroscopy on inclusions in diamonds from Sao Luiz, Brazil, show that Mg,Fe)O inclusions contain little Fe3+ (Fe3+/ΣFe ≤ 7%), whereas inclusions with pyroxene composition (believed to have been originally in the perovskite structure) and tetragonal almandine-pyrope phase (TAPP) inclusions contain high relative amounts of Fe3+ (Fe3/ΣFe = 20 to 75%). These observations are consistent with high-pressure experiments on synthetic samples and support the idea that the inclusions originated in the lower mantle. Fe-Mg partitioning data for co-existing (Mg,Fe,Al)(Si,Al)O3- (Mg,Fe)O pairs also indicate that the phases were in equilibrium at the time of diamond formation in the lower mantle.
AB - Mossbauer spectroscopy on inclusions in diamonds from Sao Luiz, Brazil, show that Mg,Fe)O inclusions contain little Fe3+ (Fe3+/ΣFe ≤ 7%), whereas inclusions with pyroxene composition (believed to have been originally in the perovskite structure) and tetragonal almandine-pyrope phase (TAPP) inclusions contain high relative amounts of Fe3+ (Fe3/ΣFe = 20 to 75%). These observations are consistent with high-pressure experiments on synthetic samples and support the idea that the inclusions originated in the lower mantle. Fe-Mg partitioning data for co-existing (Mg,Fe,Al)(Si,Al)O3- (Mg,Fe)O pairs also indicate that the phases were in equilibrium at the time of diamond formation in the lower mantle.
UR - http://www.scopus.com/inward/record.url?scp=0030667978&partnerID=8YFLogxK
U2 - 10.1126/science.278.5337.434
DO - 10.1126/science.278.5337.434
M3 - Review article
AN - SCOPUS:0030667978
SN - 0036-8075
VL - 278
SP - 434
EP - 436
JO - Science
JF - Science
IS - 5337
ER -