| 论内源盆地动力场及磷块岩富集作用的动力学分析 |
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| 引用本文： | 孟祥化,葛铭.论内源盆地动力场及磷块岩富集作用的动力学分析[J].化工矿产地质,1995,17(3):145-157. |
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| 作者姓名： | 孟祥化 葛铭 |
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| 摘 要： | 内源盆地泛指非陆源沉积盆地。其最终沉积方式和展布格局受物理、物理化学、生物化学、生物物理等多种动力场的制约;沉积作用场包括各种直观性和背景性的动力学过程,这种过程由其性质、作用方式、方向强度和变化梯度所决定。就沉积磷矿而言,从全球冰室效应期向温室效应期的突变是引起大洋磷酸盐富集的主因;与这一转变过程相联系的二级或三级最大海泛事件及其伴生洋流上翻就是富集成磷块岩的沉积动力场。中国晚震旦世、早寒武世巨型磷块岩建造便是其明显例证,其磷块岩层序的向上变浅的特征和微相变化特征都是高频率海平面变化动力场(即米兰柯维奇事件)的历史记录,也反映出巨型磷块岩建造具有多级次多旋回沉积特征。
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| 关 键 词： | 沉积动力场 动力学过程的直观性和背景性 场的交叉和体系复合 磷酸盐盆地层序 最大海泛事件 高频率海平面变化 米级旋回 |
ON DYNAMICAL FIELDS OF ORTHOGENETIC BASINS CONTROLLING ON ENRICHMENT OF PHOSPHORITE |
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| Abstract: | Generally refereed to as a non-terrigenous sedimentary basin,orthogenetic basins have had their basin-infilling regimes and hence ultimate infill-alignments controlled by quite a few dynamic fields such as physical,physicochemical, biochemical,biophysical and so on.These dynamical fields considerably governing basin accumulation involved various kinetic processes,on local or global scale, depending on their features,manners,intensities,orientations and changing gradients. So far as phosphorite deposition is coneerned,a sudden shift of icehouse efficiency to greenhouse one represented essential responsibility for extensive concentration of phosphate materials in oceanic basins while the maximum marine floodings,or second or third-order events,caused by the shift and the related current upwelling did nothing other than act as a dynamic field for traping phosphorite.Such arguments have been supported exclusively by the widespread phosphorite formations in China of Late Sinian and Early Cambrian ages whose upward-shaUowing,microfaeies- varying,phosphate sequenees,not only record the history of dynamic field addressing high-frequency eustatic movements but reveal the multiorder,muRieycle deposition typical of many enormous phosphorite deposits. |
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