浙江建德銅礦成礦流體、成礦物質(zhì)來源與礦床成因探討
發(fā)布時間:2018-11-03 20:41
【摘要】:浙江建德銅礦位于欽杭結(jié)合帶北東段,是浙江省最大的銅礦之一,該礦床的成因一直存在爭議。本文在詳細的野外調(diào)查基礎(chǔ)上,對建德銅礦成礦期流體包裹體及氫、氧、硫同位素進行了系統(tǒng)測定。流體包裹體研究表明,建德銅礦主要發(fā)育三類包裹體:Ⅰ類富液相氣液兩相包裹體,Ⅱ類富氣相氣液兩相包裹體,以及Ⅲ類含子晶包裹體。顯微測溫結(jié)果顯示:Ⅰ類富液相包裹體加熱后均一到液相,均一溫度分布范圍主要集中在280~340℃,流體包裹體鹽度0.63%~8.00%NaCleqv;Ⅱ類富氣相包裹體加熱均一到氣相,均一溫度296~334℃,鹽度1.22%~2.00%NaCleqv,屬低鹽度范圍;Ⅲ類含子晶包裹體加熱均一到液相,均一溫度范圍與Ⅱ類包裹體基本相同,分布范圍為290~326℃,鹽度很高,分布范圍為31.87%~38.16%NaCleqv。Ⅱ類與視域內(nèi)共存的Ⅲ型流體包裹體的均一溫度相似,鹽度相差很大,表明發(fā)生強烈的流體沸騰作用。流體的強烈沸騰作用是造成建德銅礦成礦物質(zhì)沉淀富集的原因。氫氧同位素測試結(jié)果(δ~(18)O_(H_2O)值在8.1‰~10.6‰,δDH_2O變化范圍從-78‰~-61‰)顯示成礦流體主要為巖漿流體。硫化物硫同位素研究顯示,δ~(34)S值的總體變化范圍是0.78‰~4.77‰,并且總體分布在零值附近呈塔式分布,這也暗示著建德銅礦硫化物的硫主要來自于巖漿。流體包裹體及氫、氧、硫同位素研究,并結(jié)合地質(zhì)特征,表明建德銅礦是與晚侏羅世燕山期花崗閃長斑巖有關(guān)的,受石炭系灰?guī)r、白云巖和泥盆系砂巖之間"硅鈣面"控制的巖漿熱液礦床。
[Abstract]:Jiande copper deposit in Zhejiang province is one of the largest copper deposits in Zhejiang province. On the basis of detailed field investigation, the fluid inclusions, hydrogen, oxygen and sulfur isotopes in the metallogenic period of Jiande Copper Mine were systematically determined. The study of fluid inclusions shows that there are mainly three types of inclusions in Jiande Copper Mine: type 鈪,
本文編號:2308984
[Abstract]:Jiande copper deposit in Zhejiang province is one of the largest copper deposits in Zhejiang province. On the basis of detailed field investigation, the fluid inclusions, hydrogen, oxygen and sulfur isotopes in the metallogenic period of Jiande Copper Mine were systematically determined. The study of fluid inclusions shows that there are mainly three types of inclusions in Jiande Copper Mine: type 鈪,
本文編號:2308984
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