东天山似斑状角闪辉长岩类与铁钛氧化物矿床的关系
发布时间：2018-11-28 16:43
【摘要】：似斑状角闪辉长岩类是东天山镁铁-超镁铁杂岩的一部分,以含有嵌晶角闪石为特征,其中部分岩体的似斑状角闪辉长岩赋存铁钛氧化物矿床。为探讨东天山似斑状角闪辉长岩类和铁钛氧化物矿床形成的内在成因关系,本次研究对二红洼、牛毛泉和香山西似斑状角闪辉长岩类的斜长石、单斜辉石、斜方辉石以及嵌晶角闪石进行了系统的电子探针成分分析,并对其形成物理化学条件进行了探讨。结果表明,东天山似斑状角闪辉长岩类的母岩浆氧逸度变化范围为NNO-0.37~NNO+1.15,和攀西地区最大的红格岩体的氧逸度一致,侵入于中下地壳,深度介于8.9~15.7km,结晶温度大于914℃。东天山似斑状角闪辉长岩中铁钛氧化物矿床的富集得益于母岩浆的高氧逸度,但铁钛氧化物矿床的形成和规模则受控于各个岩体的岩浆演化程度。二红洼、牛毛泉和香山西的岩浆的演化程度系统增高,演化程度最低的二红洼岩体并未形成铁钛氧化物矿床,而分异演化程度逐渐增高的牛毛泉和香山西似斑状角闪辉长岩类则分别形成了本区一个小型的和一个大型的铁钛氧化物矿床。
[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，
本文编号：2363557
[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，
本文编号：2363557
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2363557.html
