【摘要】：似斑狀角閃輝長巖類是東天山鎂鐵-超鎂鐵雜巖的一部分,以含有嵌晶角閃石為特征,其中部分巖體的似斑狀角閃輝長巖賦存鐵鈦氧化物礦床。為探討東天山似斑狀角閃輝長巖類和鐵鈦氧化物礦床形成的內(nèi)在成因關(guān)系,本次研究對二紅洼、牛毛泉和香山西似斑狀角閃輝長巖類的斜長石、單斜輝石、斜方輝石以及嵌晶角閃石進行了系統(tǒng)的電子探針成分分析,并對其形成物理化學條件進行了探討。結(jié)果表明,東天山似斑狀角閃輝長巖類的母巖漿氧逸度變化范圍為NNO-0.37~NNO+1.15,和攀西地區(qū)最大的紅格巖體的氧逸度一致,侵入于中下地殼,深度介于8.9~15.7km,結(jié)晶溫度大于914℃。東天山似斑狀角閃輝長巖中鐵鈦氧化物礦床的富集得益于母巖漿的高氧逸度,但鐵鈦氧化物礦床的形成和規(guī)模則受控于各個巖體的巖漿演化程度。二紅洼、牛毛泉和香山西的巖漿的演化程度系統(tǒng)增高,演化程度最低的二紅洼巖體并未形成鐵鈦氧化物礦床,而分異演化程度逐漸增高的牛毛泉和香山西似斑狀角閃輝長巖類則分別形成了本區(qū)一個小型的和一個大型的鐵鈦氧化物礦床。
[Abstract]:Porphyry hornblende gabbro is a part of the Magnesium-ultramafic complex in the East Tianshan Mountains and is characterized by the presence of embedded hornblende. Some of the porphyry hornblende gabbro contain Fe-Ti oxide deposits. In order to study the genetic relationship between porphyry hornblende gabbro and iron-titanium oxide deposits in East Tianshan, plagioclase and clinopyroxene from Erhong WA, Niu Mao Quan and Xiangxi like porphyry hornblenopyroxene were studied in this paper. The composition of orthopyroxene and amphibole were systematically analyzed by electron probe, and the physical and chemical conditions of their formation were discussed. The results show that the variation range of oxygen fugacity of the parent magma of the East Tianshan like hornblende gabbro is NNO-0.37~NNO 1.15, which is consistent with the oxygen fugacity of the largest Hongge rock body in the Panxi area, and invades the middle and lower crust with a depth of 8.9 ~ 15.7km. The crystallization temperature is more than 914 鈩，

本文編號：2363557