| 胡文瑄,胡受奚.宁芜和庐枞地区钠长石化的钠质来源新探[J].地质找矿论丛,1991,(2):36-46 |
| 宁芜和庐枞地区钠长石化的钠质来源新探 |
| Na SOURCE OF ALBITIZATION IN NINGWU-TYPE IRON-SULFUR DEPOSITS OF NINGWU-LUZONG AREA |
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| DOI：10.6053/j.issn.1001-1412.1991.2. 004 |
| 中文关键词: 钠长石化 钠质来源 火山洼地 高盐卤水 同位素 宁芜和庐枞地区 |
| 英文关键词: |
| 基金项目:博士后科学基金 |
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| 摘要点击次数: 1046 |
| 全文下载次数: 2022 |
| 中文摘要: |
| 目前普遍认为,宁芜型铁、硫矿床中的钠长石化的钠质来源与周冲村组膏岩层有关。本文的研究对此提出了质疑,认为膏岩层中缺乏钠源基础,而从新的角度提出了钠质主要来源于当时火山洼地中高盐卤水的观点。认为是富钠卤水参与了火山活动引起的热对流循环,才形成了显著的蚀变与矿化。文章从矿化蚀变与火山洼地的空间关系、洼地中水化学性质以及H-O、Rb-Sr和S同位素特征等诸方面对这一观点作了论述。 |
| 英文摘要: |
| It is believed that Na source of albitization in Ningwu type iron-sulfur deposits is derived from middle Triassic marine anhydrite beds.This paper considers the point doubtful, because there is not only no halite (NaCl) beds, but also less other form sodium in the anhydrite-bering sequence.So it is impossible for anhydrite beds to be main Na source of albitization.Based on studies of many aspects of geology and geochemistry, authors believe that main sourceof albitization is from high-saline brines in contemporary volcanic depressions.Main evidences are asfollowings:1) Alteration (albitization) and mineralizations are mainly located in the depressions or attheir margins, and clearly controlled by water-bearing depressions; 2) Under aridevaporate conditions, the depressions concentrated many brines enriched in sodium, having material base of Nasource; 3) H-O isotope composition is near to the atmospheric water line, showing that ore-bearing solutions mainly derived from surface water and/or ground water-Na-rich brines in the depressions.Rb-Sr and S isotope data also support this viewpoint; 4) It has been proved that most ore deposits formed in hot-water circulating system.Similarly, in this area circulating systems caused by calderaand subvolcanic rocks make Narich brines permeate downwards and react with volcanic rocks, resulting in a series of alterations (such as albitization) and mineralizations. |
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