A COMPARISON OF IRON EXTRACTION METHODS FOR THE DETERMINATION OF DEGREE OF PYRITISATION AND THE RECOGNITION OF IRON-LIMITED PYRITE FORMATION

被引:325
作者
RAISWELL, R
CANFIELD, DE
BERNER, RA
机构
[1] GEORGIA INST TECHNOL,DEPT EARTH & ATMOSPHER SCI,ATLANTA,GA 30332
[2] YALE UNIV,DEPT GEOL & GEOPHYS,NEW HAVEN,CT 06511
关键词
D O I
10.1016/0009-2541(94)90084-1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Measurements of degree of pyritisation require an estimate of sediment iron which is capable of reaction with dissolved sulphide to form pyrite, either directly or indirectly via iron monosulphide precursors. Three dissolution techniques (buffered dithionite, cold 1 M HCl, boiling 12 M HCl) were examined for their capacity to extract iron from a variety of iron minerals, and iron-bearing sediments, as a function of different extraction times and different grain sizes. All the iron oxides studied are quantitatively extracted by dithionite and boiling HCl (but not by cold HCl). Both HCl techniques extract more iron from silicates than does dithionite but probably about the same amounts as are potentially capable of sulphidation. Modern sediment studies indicate that most sedimentary pyrite is formed rapidly from iron oxides, with smaller amounts formed more slowly from iron silicates (if sufficient geologic time is available). It is therefore recommended that the degree of pyritisation be defined with respect to the dithionite-extractable (mainly iron oxide) pool and/or the boiling HCl-extractable pool (which includes some silicate iron) for the recognition of iron-limited pyritisation.
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页码:101 / 110
页数:10
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