GALLIUM‐BEARING SPHALERITE IN A METAL‐SULFIDE NODULE OF THE QINGZHEN (EH3) CHONDRITE
作者:
E.R. Rambaldi,
R.S. Rajan,
R.M. Housley,
D. Wang,
期刊:
Meteoritics
(WILEY Available online 1986)
卷期:
Volume 21,
issue 1
页码: 23-31
ISSN:0026-1114
年代: 1986
DOI:10.1111/j.1945-5100.1986.tb01223.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
The Qingzhen (EH3) chondrite contains a population of spheroidal metal‐sulfide nodules, which display textural evidence of reheating and melting. Evidence of metal sulfuration is also present, suggesting replacement of metal by sulfide during melting. This process has led to the nucleation of perryite along metal‐sulfide interfaces.Gallium‐bearing sphalerite and a Cu‐sulfide of composition intermediate between chalcopyrite and cubanite occur as inclusions within the metal of some nodules. Other phases present are: kamacite, troilite, Ga‐free sphalerite, niningerite, perryite, schreibersite, oldhamite, Cr‐sulfide (minerals A and B), djerfisherite, SiO2, albite and enstatite. The Ga‐bearing sphalerite may have formed by injection of molten sulfide droplets into the metal followed by subsolidus diffusion of Ga from the metal into the sulfide. The latter may occur because of Ga supersaturation in the metal during progressive sulfuration and its decreased affinity for the metal phase during cooling below the taenite‐kamacite t
点击下载:
PDF
(962KB)
返 回