海南岛红树林泥炭中硫及其成因研究

STUDY OF SULPHUR AND ITS GENESIS IN MANGROVE PEATS OF HAINAN ISLAND

海南岛红树林泥炭普遍富硫。黄铁矿、硫酸盐和有机硫是泥炭中硫的三种主要赋存形态,其中,以黄铁矿硫高为特征。利用形态硫分析、硫同位素分析等手段结合硫的时空变化特征,研究了泥炭中硫的形成机理。泥炭中硫的富集与泥炭坪环境具紧密的成因联系,全硫和形态硫的时空变化受微环境的控制;潮坪水介质中的硫酸盐是泥炭中硫的最初来源;泥炭中硫的加入,主要发生于准同生价段,在加入过程中还原硫细菌起了决定性作用。定量沉积环境分析是查明古代富硫煤田硫分布的主要途径。

Sulphur commonly abounds in mangrove peats, of which pyrite sulphate and organic sulphur are three dominent kinds of occurence forms and which is characterized with high pyrite sulphur.Authors have studied the genetic mechanism of sulphur in mangrove peats in detail by using such methods as sulphur forms and sulphur isotope analysis and combining them with the space-time variation of sulphur and have drawn the following conclusion: The enrichment of sulphur in peats is intimately relative to peat flat environments and the space-time variation of total sulphur and sulphur forms is under the control of micro-environments still farther; Sulphate in water medium of tidal flats is the final source of sulphur in peats; Sulphur incorporation in peat mainly takes place at penecontemporaneous diagenetic stage and sulphur reducing bacteria play a dominant role during incorporating sulphur processes; performing quantitive depositional environment analysis is the important approach to identify sulphur distribution in ancient sulphur-rich coal fields.