本文選題：流體包裹體 + 氫-氧-硫同位素�。� 參考：《中國地質(zhì)大學(xué)(北京)》2016年碩士論文

【摘要】：灑西鎢礦床是老君山礦集區(qū)內(nèi)典型的鎢礦床。礦體賦存于下元古界灑西巖組(Pt1s)中,區(qū)內(nèi)的構(gòu)造主要是SE-NW的推覆構(gòu)造,與成礦相關(guān)的巖漿巖為燕山期老君山花崗巖。礦體包括石英脈型和浸染型兩種類型。浸染型礦體受地層和構(gòu)造控制主要呈似層狀,形態(tài)簡單。石英脈型呈脈狀,一方面疊加于層狀礦體之上,促使礦化更加富集；另一方面也能單獨形成較富的脈狀礦體。該礦床的形成經(jīng)歷了三個礦化階段,分別為硅酸鹽階段(矽卡巖階段)、氧化物一硫化物階段(鎢酸鹽)和碳酸鹽階段,白鎢礦主要在前二階段形成。通過進行流體包裹體的研究測試,灑西鎢礦床從硅酸鹽一氧化物硫化物一碳酸鹽階段,流體均一溫度呈現(xiàn)不斷降低趨勢(360-230℃),同時鹽度也逐漸降低。灑西鎢礦的成礦流體為一套貧CO2,較低鹽度(多數(shù)10%),中等溫度的NaCl-H2O不混溶流體體系。通過H-O-S同位素測試,灑西鎢礦床成礦流體主要來源是巖漿水,混有建造水或大氣降水。同位素及元素化學(xué)分析顯示,成礦物質(zhì)具有多源性主要來源于巖體和高鎢背景值的地層。礦床成礦時代為早白堊世,推覆構(gòu)造是控礦的主要因素之一,灑西鎢礦床總體的成因類型為中溫?zé)嵋好}型白鎢礦床。
[Abstract]:Saoxi tungsten deposit is a typical tungsten deposit in Laojunshan ore concentration area. The orebody occurred in the Lower Proterozoic Sexi formation (Pt1s). The structure in the area is mainly SE-NW nappe, and the magmatic rocks associated with mineralization are Yanshanian Laojunshan granite. The orebody consists of quartz vein type and impregnated type. The ore bodies are stratiform and simple by strata and tectonics. The quartz vein type is veinlike on the one hand superimposed on the layered orebody which promotes the mineralization to be more enriched on the other hand it can form a rich vein ore body alone. The formation of the deposit has gone through three mineralization stages: silicate stage (skarn stage), oxide-sulfide stage (tungstate) stage and carbonate stage, while scheelite mainly formed in the first two stages. Through the study and test of fluid inclusions, from the stage of silicate-oxide sulfide-carbonate stage, the homogenization temperature of fluid presents a decreasing trend of 360-230 鈩，

本文編號：1806095