| 单词 |
podiform |
| 释义 |
podiform, a.|ˈpɒdɪfɔːm|
[f. pod n.2 + -i- + -form.]
Having the form of a pod; spec. designating a thick pod-shaped deposit of a mineral, esp. chromite. Cf. pod n.2 6.
1961T. P. Thayer in Symposium Chrome Ore 1960 203 In most podiform deposits..the chromite shows an obscure to well-developed pattern of subparallel olivine- or serpentine-filled fractures superposed on the original textures. 1978Nature 12 Oct. 539/2 Massive sulphide deposits (Cu, Ni) occur on Karmoy and the neighbouring small islands, though as yet no podiform chromites have been observed in the serpentinised peridotites. 1983Econ. Geol. LXXVIII. 293/1 Podiform chromite deposits are the only economic concentrations of chromite that occur in ophiolite peridotites, i.e., alpine-type peridotites. 1988Ann. Rev. Earth & Planetary Sci. XVI. 167 Phanerozoic orogenic belts can practically be outlined by igneous-related ores..that may have formed at midocean ridges, such as podiform chromite and perhaps some Cyprus-type massive sulfides. |
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