【摘要】 <正> 在磷矿床成因理论方面,几十年来化学沉淀说有着重要影响。但是越来越多的资料和证据表明与纯化学沉淀说存在很多矛盾,磷块岩矿床形成机理是相当复杂的。应当重视这些问题的深入研究,使现代沉积磷矿成因理论推进一步,破除陈旧观念,以求更有成效地指导磷矿予测。 为了上述目的,本文对我国震旦亚界,寒武系磷矿床进行了建造分析和物质组成、微相、沉积地球化学方面的研究,并进一步探讨成矿机理问题。更多还原

【Abstract】 The two phosphatie formations distributed in Yunan-Guizhou-Sichuan (Lower Cambrian) and Hubei-Hunan-Guizhou (Late Sinian) which were originally thought to be terrestrial carbonate deposits should be regarded as tele-siliceous formation in character as is evidenced by regional formation sequence patterns.The implications of this observation are discussed with respect to tectonic and prospecting for P,I,and other base metals.In the light of detailed investigation on microphase composition microphase Zoning and those features concerning depositional environment and geochemistry,a mechanism of phosphate accumulation is proposed with special reference to the role of dynamic chemistry,F,palaeotectonics and palaeoclimatology.It is pointed out by the author that the proposal of chemical deposition suggested by A.V.Kazakov is in conflict with the model of microphase zonation and formation sequence patterns.The relationship is also dealt with between the ratios of CO2/P2O5 and P/P2O5 on the one hand and the mechanism of phosphate accumulation on the other.更多还原