【摘要】：河南舞陽地區(qū)位于華北板塊南緣，該區(qū)是河南省主要鐵礦產(chǎn)地，查明鐵礦資源儲量占全省總查明資源儲量的46%，礦區(qū)內(nèi)鐵礦床有兩種類型：即產(chǎn)在古元古代鐵山廟組的BIF型鐵山廟式鐵礦床和賦存在新太古代趙案莊組中，與超基性巖體有關(guān)的趙案莊式晚期巖漿礦床。 與成礦有關(guān)的超基性侵入體呈巨大的似層狀、透鏡狀侵入趙案莊組透輝角閃斜長片麻巖中，主要巖石類型為橄欖巖類、輝石巖類和角閃石巖類。趙案莊鐵礦床為產(chǎn)于超基性巖中緩傾斜的隱伏礦床，主要產(chǎn)在下部橄欖巖體中。礦體形體與超基性巖體基本一致，礦體厚度與巖體厚度多呈正消長關(guān)系。礦體的微觀特征顯示礦石具有典型的海綿隕鐵結(jié)構(gòu)，，橄欖石多已經(jīng)由于巖漿作用后期自變質(zhì)作用發(fā)生蛇紋石化。以上特征均說明該礦床類型屬于晚期巖漿礦床。 趙案莊鐵礦床礦石成分主要為磁鐵礦，與磁鐵礦共生的礦物除蛇紋石外，含有大量磷灰石和少量鈦鐵礦以及金紅石和鋯石。電子探針數(shù)據(jù)顯示礦石中磁鐵礦成分與河北大廟等地區(qū)磁鐵礦有較大差異，為較“純凈”的磁鐵礦，除FeOT外，其他氧化物含量基本小于1%。 超基性巖體的演化除早期呈似層狀侵入趙案莊組的片麻巖外，在演化晚期還見透輝石巖呈脈狀穿切鐵山廟組的BIF型礦體和大理巖。趙案莊鐵礦體和穿切BIF型礦體的透輝石巖的微量元素分析結(jié)果，顯示他們可能為同源巖漿演化的產(chǎn)物。微量元素顯示他們具有P、Ti等元素的負(fù)相關(guān)性，這種元素分配特征可以通過宏觀上副礦物含量來解釋。礦體中含有大量磷灰石和磁鐵礦，所以礦體的化學(xué)分析結(jié)果顯示P、Ti等元素含量正異常。而透輝石巖為巖漿分異晚期產(chǎn)物，巖漿演化早期分異出大量磷灰石和鈦鐵礦，因而巖漿晚期的透輝石巖P、Ti含量較低。 在蛇紋磁鐵礦石中獲取鋯石顆粒，進(jìn)行LA-MC-ICP-MS年齡測定。通過對鋯石CL圖像分析，說明鋯石遭受后期變質(zhì)作用改造。獲得不一致線的上交點(diǎn)年齡為1943±5Ma，是遭受強(qiáng)烈變質(zhì)作用年齡，也就是礦體形成時代上限。賦礦侵入巖體晚期分異的透輝石巖脈穿切了鐵山廟組BIF型鐵礦。鐵山廟組地層形成在古元古代，其形成時代可以作為礦體形成時代的下限。因而礦體形成于1943Ma 2500Ma，即古元古代。 探討了礦床的成礦物質(zhì)來源、成礦動力學(xué)、成礦特征、結(jié)合成礦時代等因素提出礦床成礦模式，認(rèn)為趙案莊鐵礦床是產(chǎn)于超基性巖中的古元古代晚期巖漿分結(jié)礦床，是我國目前已知的最古老的巖漿型鐵礦床。
[Abstract]:The Wuyang area in Henan Province is located in the southern margin of the North China Plate, which is the main iron ore producing area in Henan Province, and the identified iron ore resource reserves account for 46% of the total identified resources reserves in the province. There are two types of iron deposits in the ore area: the BIF type Tieshanmiao type iron deposit occurred in the Gu Yuan ancient Tieshanmiao formation and the late Zhaozhuang magmatic deposit in the Neoarchean Zhaojazhuang formation, which is related to the ultrabasic rock mass. The ultrabasic intrusions related to mineralization are in a large layer-like form, and lenticular intrusions into the diopside amphibolite gneiss of the Zhaozhuangzhuang formation. The main rock types are peridotite, pyroxenite and amphibolite. Zhaojizhuang iron deposit is a steeply inclined concealed deposit occurring in ultrabasic rocks, mainly in the lower olivine body. The shape of the orebody is basically consistent with the ultrabasic rock mass, and the thickness of the orebody and the thickness of the rock mass are mostly positive fluctuating relationship. The microscopic characteristics of the ore bodies show that the ore has a typical spongy meteorite structure, and the peridotite has been turned into serpentinization due to the self-metamorphism in the late stage of magmatism. All the above characteristics indicate that this type of deposit belongs to the late magmatic deposit. The ore composition of Zhaozhazhuang iron deposit is mainly magnetite. The minerals associated with magnetite contain a lot of apatite and a small amount of ilmenite and rutile and zircon in addition to serpentine. The EPMA data show that the composition of magnetite in the ore is quite different from that in Damiao area of Hebei Province. The magnetite is relatively "pure" magnetite. Except for FeOT, the contents of other oxides are less than 1%. In addition to the gneisses that invaded the Zhaojazhuang formation in the early stage of the ultrabasic rock evolution, diopside rocks were also seen as vein-like BIF-type orebodies and marble in the Tieshanmiao formation in the late stage of evolution. The trace element analysis results of diopside rocks of Zhaozhazhuang iron orebody and through-cut BIF type orebody indicate that they may be the product of the evolution of homologous magma. Trace elements show a negative correlation with P, Ti and other elements, which can be explained by the macroscopical content of accessory minerals. There are lots of apatite and magnetite in the ore body, so the chemical analysis of the ore body shows that the contents of P, Ti and other elements are abnormal. The diopside is a late product of magmatic differentiation, and a large number of apatite and ilmenite were differentiated in the early stage of magmatic evolution, so the P and Ti contents of the diopside in the late magmatic stage are relatively low. Zircon particles were obtained from serpentine magnetite for LA-MC-ICP-MS dating. Through the analysis of CL images of zircon, it is shown that zircon suffered from metamorphism in late stage. The upper intersection age of the inconsistency line is 1943 鹵5 Ma, which is the age of strong metamorphism, that is, the upper age limit of ore body formation. Diopside veins of late ore-bearing intrusive rocks cut through BIF-type iron ore deposit of Tieshanmiao formation. Tieshanmiao formation was formed in ancient Gu Yuan, and its forming age can be regarded as the lower limit of ore body forming age. As a result, the orebody was formed in 1943Ma, 2500 Ma, that is, the ancient Gu Yuan. The ore-forming model of Zhaozhazhuang iron deposit is put forward according to the ore-forming age and other factors. It is considered that the Zhaozhazhuang iron deposit is a late-stage magmatic ore-splitting deposit of Gu Yuan, which occurred in ultrabasic rocks, and the ore-forming characteristics of the deposit are discussed in this paper. It is the oldest magmatic iron deposit known in China.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.31

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