峡东地区的“三峡奇石”——沉积结核

“Three Gorges Landscape Stones": the Sedimentary Concretion in Eastern Three Gorges Area

峡东地区大量发现的具有极大观赏价值的三峡奇石,实际上是夹持在沉积岩中的同生大型钙(硅)质沉积结核。通过对这些奇石野外特征、内部组成、形成环境等方面的研究,表明它们应该是形成于强还原环境中陆棚浅海—滞流(海湾)盆地,稳定水动力条件下的产物。本文借鉴"人工合成锰矿物实验及其产物"报道的经验和"晶体成核理论"以及国外有关学者的近期研究见解,全面深入地分析、讨论了该类罕见的同生钙质结核的形成机理。

A lot of perfect ornamental Three Gorges landscape stones found in Eastern Three Gorges Area. They are actually large-scale calcium（silica） syndepositional nodules body wrapped in sedimentary rocks. Through studing the field character, internal composition, forming environment and other aspects of thses rocks.The paper points out that they came into being probably in strong reducing shallow shelf-stagnation flows （the Gulf） basin with very stable hydrodynamic conditions. Referring to the report ＂experimental and synthetic manganese mineral products＂ and ＂crystal nucleation theory＂ as well as recent research insights of foreign scholars, we shows a comprehensive in-depth analysis and discussion on formation mechanism of the sort of rare syngenetic concretion.