本文關(guān)鍵詞： 礦物化學成分 結(jié)晶條件 中生代花崗巖 金礦化 膠西北　出處：《巖石學報》2017年10期 　論文類型：期刊論文

【摘要】：在詳細的野外地質(zhì)和巖相學觀察基礎(chǔ)上,對膠西北中生代玲瓏期、郭家?guī)X期和偉德山期花崗巖中的黑云母和角閃石進行了系統(tǒng)的化學成分研究。結(jié)果顯示,玲瓏期,研究區(qū)中部和南部花崗巖中的黑云母為鐵葉云母和鐵質(zhì)黑云母,其MgO為4.07%~6.53%,具有殼源型黑云母的特征;北部主要為鐵質(zhì)黑云母和鎂質(zhì)黑云母,MgO介于9.13%~11.57%之間,具殼�；煸葱偷奶卣�;郭家?guī)X期和偉德山期花崗巖中的黑云母以鐵質(zhì)黑云母和鎂質(zhì)黑云母為主,MgO為7.62%~15.38%,均為殼幔混源型,其中的角閃石均屬于鈣質(zhì)角閃石,M值為0.44~0.76。暗色礦物成分顯示玲瓏期花崗巖的源區(qū)物質(zhì)主要為殼源,郭家?guī)X期和偉德山期的以殼源為主,有少量幔源組分參與。三期花崗巖中黑云母結(jié)晶溫度主要集中于550~700℃,而角閃石的結(jié)晶溫度為600~750℃,從玲瓏期到郭家?guī)X期再到偉德山期,即從早到晚,黑云母的結(jié)晶溫度有升高的趨勢;全鋁壓力計估算結(jié)果顯示,黑云母和角閃石的結(jié)晶壓力具有降低的趨勢。郭家?guī)X期和偉德山期花崗巖中黑云母結(jié)晶過程中的氧逸度分別為-15.0~-9.0和-15.3~-8.8,明顯比玲瓏期的(-17.5~-13.2)高。結(jié)合膠西北金礦的時空分布特征,認為花崗巖結(jié)晶過程中較高的氧逸度和幔源物質(zhì)的參與可能是有利于金礦化的重要條件之一。
[Abstract]:On the basis of detailed field geological and petrographic observations, the biotite and amphibole in the granites of the Linglong, Guojialing and Weideshan periods in northwestern Jiao were studied systematically. The results show that the Linglong period, The biotite in the granites in the central and southern part of the study area is iron mica and ferric biotite, whose MgO is 4.07 and 6.53, which is characterized by crustal biotite, while in the north is mainly ferric biotite and magnesia biotite with the characteristics of crust-mantle mixing type, between 9.13% and 11.57%. In the Guojialing and Weideshan granites, the biotite mainly consists of ferric biotite and magnesia biotite, and the MgO is 7.62mica 15.38, both of which belong to the crust-mantle mixed source type. Among them, hornblende belongs to calcareous hornblende with M value of 0.440.76.The dark mineral composition shows that the source material of Linglong granite is mainly crust source, and that of Guojialing period and Weideshan period is mainly crust source. The crystallization temperature of biotite is mainly concentrated at 550 ~ 700 鈩，

本文編號：1550836