论文部分内容阅读
红岩黄铁矿床是产于广东英德盆地中泥盆统东岗岭碳酸盐地层中的一个层控矿床。作者经详细研究之后,认为在含矿地层沉积时就存在着一个古水下隆起,由于古水下隆起控制了古地形,因而表现出不同的沉积作用。在矿区的中部东岗岭组较薄,主要为潮坪一泻湖相,而矿区的东、西部东岗岭组沉积较厚,表现为礁滩相。黄铁矿在东岗岭组沉积期和成岩早期沉积并再富集。 在东岗岭组成岩的晚期发生白云岩化作用。来自下伏地层砂岩、泥岩的富含Mg、Fe的水与孔隙水以及地下淡水发生混合引起了灰岩的白云岩化,以及矿源层中成矿元素的活化,并与来自砂岩和泥岩中的成矿物质叠加在一起。在白云岩中,特别是在古水下隆起之上经白云岩化之后,含矿溶液经过充填和交代作用而形成红岩矿床。显微镜研究,微量元素分析,硫、铅、氧、碳同位素研究的结果都支持这一成岩成矿模式。
The Hongyan pyrite deposit is a stratiform deposit hosted by the Donggangling carbonate formation in the Yingde Basin, Guangdong. After a detailed study, the author believes that there is an ancient underwater uplift in the ore-bearing formation deposition, and different sedimentation due to the paleo-submarine uplift controlling the paleo-topography. In the middle part of the mining area, the Donggangling Formation is thin and mainly consists of a tidal flat and a lacustrine facies. However, the Donggangling Formation in the east and west of the mine area is relatively thick, showing reef-shoal facies. Pyrite deposits and re-enriches during the sedimentation and early diagenesis of the Donggangling Formation. Dolomitization occurred in the late Donggangling formation. The mixing of Mg, Fe-rich water from the underlying formations of sandstone and mudstone with pore water and subsurface freshwater led to the dolomitization of limestone and the activation of metallogenic elements in the source rock, Metallogenic substances superimposed together. In dolomites, especially after dolomitization over paleo-underwater uplifts, ore-bearing solutions fill and redefine to form a red-rock deposit. Microscopic studies, trace element analysis, results from sulfur, lead, oxygen and carbon isotope studies support this diagenetic mineralization pattern.