本文選題：條帶狀輝石磁鐵石英巖 + 浸染狀磁鐵輝石巖��； 參考：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：舞陽地區(qū)位于華北克拉通南部。舞陽鐵礦包括鐵山廟式鐵礦和趙案莊式鐵礦。鐵山廟式鐵礦賦存于新太古界太華群鐵山廟組變質(zhì)巖系中。礦體呈似層狀、透鏡狀,層位分布穩(wěn)定,大理巖常為礦體的頂?shù)装�。�?種礦石類型:浸染狀磁鐵輝石巖和條帶狀輝石磁鐵石英巖,其中,浸染狀磁鐵輝石巖主要由輝石和磁鐵礦組成,基本不含石英,與條帶狀輝石磁鐵石英巖明顯不同,它是原基性火山巖變來還是其他成因存在爭議。本文對礦石和圍巖大理巖進行了詳細的地質(zhì)學和地球化學對比研究,試圖為探討鐵山廟式鐵礦的形成過程提供更多的信息。浸染狀磁鐵輝石巖、條帶狀輝石磁鐵石英巖、蝕變大理巖和輝石巖中的單斜輝石相似,Al2O3、Ti O2含量低,與來自片麻巖中的單斜輝石Al2O3、Ti O2含量較高明顯不同。浸染狀磁體輝石巖與條帶狀輝石磁鐵石英巖具有相似的地球化學特征,均主要由Si O2、TFe2O3、Ca O和Mg O組成,而其他氧化物的含量均很低;二者及其中的磁鐵礦單礦物稀土元素總量很低,具有La、Eu、Y正異常和較高的Y/Ho比值,無明顯Ce和Gd異常。這些特征暗示其為一種典型的化學沉積巖,成礦物質(zhì)來源于海底熱液和海水,形成于較還原海水環(huán)境。大理巖的野外地質(zhì)特征和地球化學特征顯示其與礦石具有成因聯(lián)系。在灰色大理巖中可見黑色磁鐵輝石巖薄層或條帶,或磁鐵輝石巖與白色不純大理巖薄層或條帶互層,顯示二者同時形成;輝石巖為熱液蝕變大理巖的結(jié)果;輝石在蝕變大理巖中普遍存在;蝕變大理巖、輝石巖和礦石中的輝石具有相似的地球化學特征,低的Al2O3和Ti O2含量,Mg O和Si O2呈正相關關系,TFe O和Si O2、Mg O呈負相關關系;大理巖的稀土元素特征與礦石類似,稀土元素總量低,Eu、Y正異常等;這些特征暗示大理巖與礦石關系密切。表明礦石中的輝石不是來自火山巖,而是碳酸鹽和硅質(zhì)巖組成的化學沉積物經(jīng)變質(zhì)作用形成的。總之,浸染狀磁鐵輝石巖和條帶狀輝石磁鐵石英巖的地質(zhì)和地球化學特征表明它們具有相似的物質(zhì)來源和成因機制。因此,我們認為舞陽鐵山廟式鐵礦由沉積的石英-碳酸鹽含鐵建造變質(zhì)形成。
[Abstract]:Wuyang area is located in the south of North China Craton.Wuyang iron ore includes Tieshanmiao iron ore and Zhaoshengzhuang iron ore.Tieshanmiao iron ore deposit occurs in the metamorphic rock series of the Tieshanmiao formation of Taihua Group in the Neo-Archaean.The ore body is layered, lenticular and stable in distribution. Marble is often the top and bottom plate of the orebody.There are two types of ore: impregnated pyroxenite and banded pyroxene magnetite quartzite, in which the impregnated magnetite pyroxenite is mainly composed of pyroxene and magnetite, and basically does not contain quartz, which is obviously different from strip-shaped pyroxene magnetite quartzite.Whether it is the origin of the primary volcanic rocks or some other origin is controversial.In this paper, a detailed geological and geochemical comparison of ore and surrounding rock marble is carried out in order to provide more information for the discussion of the formation process of Tieshanmiao-type iron ore.Dipping pyroxenite, zonal pyroxene magnetite quartzite, altered marble and clinopyroxene similar to clinopyroxene have low content of Al _ 2O _ 3O _ 2, which is obviously different from the high content of clinopyroxene Al _ 2O _ 3O _ 2 from gneiss.The igneous pyroxenite and zonal pyroxene quartzite have similar geochemical characteristics. They are mainly composed of Sio _ 2, TFE _ 2O _ 3, Cao and MgO, but the contents of other oxides are very low.The total amount of rare earth elements in both magnetite and magnetite is very low, with the positive anomaly of La-Eu-Y and the high Y/Ho ratio, and there is no obvious ce and Gd anomalies.These characteristics suggest that it is a typical chemical sedimentary rock with ore-forming materials derived from submarine hydrothermal and seawater and formed in a relatively reduced seawater environment.The field geological and geochemical characteristics of marble show that it is related to ore genesis.In gray marble, black magnet pyroxenite thin layer or strip, or magnetite pyroxenite and white impure marble thin layer or strip interlayer can be seen, which shows that both of them are formed at the same time, pyroxenite is the result of hydrothermal alteration marble;The pyroxene is common in altered marble, and the pyroxene in altered marble, pyroxenite and ore have similar geochemical characteristics, and the low content of Al2O3 and TIO _ 2 are positively correlated with Sio _ 2, and there is a negative correlation between TFeO and Sio _ 2Mg-O, and there is a negative correlation between pyroxene and pyroxene in altered marble.The REE characteristics of marble are similar to those of ore, and the total amount of REE is low and EUY is positive anomaly, which suggests that marble is closely related to ore.It is shown that the pyroxene in the ore is not from volcanic rock, but is formed by metamorphism of the chemical sediments composed of carbonate and siliceous rocks.In a word the geological and geochemical characteristics of impregnated pyroxenite and banded pyroxene quartzite show that they have similar material source and genetic mechanism.Therefore, we think that Tieshanmiao iron ore deposit in Wuyang is formed by metamorphism of sedimentary quartz-carbonate iron bearing formation.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.31

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