本文選題：巖漿矽卡巖 + 富銅—鐵礦床�。� 參考：《地質(zhì)論評(píng)》2017年02期

【摘要】：拉伊克勒克銅鐵礦是最近在新疆東準(zhǔn)噶爾瓊河壩覆蓋區(qū)發(fā)現(xiàn)的高品位礦床,礦體中TFe平均達(dá)51%,Cu含量在1%以上,并伴生Au,具有埋藏淺、品位高的特點(diǎn),經(jīng)濟(jì)價(jià)值較高。該礦的發(fā)現(xiàn)首先是通過1∶5萬地面重力、磁力和激電資料的處理分析,優(yōu)選出找礦靶區(qū);然后開展大比例尺的綜合地球物理探測(cè),發(fā)現(xiàn)在第四系覆蓋區(qū)下存在高磁、高密度和中高極化率復(fù)合異常體;在異常有利地段實(shí)施鉆探,首鉆在揭穿第四系后即發(fā)現(xiàn)厚大隱伏矽卡巖型銅鐵富礦體;通過7個(gè)鉆孔的控制,求得鐵資源量2.45Mt,銅資源量44 kt。礦體主體產(chǎn)于泥盆系下統(tǒng)安山巖和凝灰?guī)r的層間構(gòu)造裂隙中,厚度8~32m,長(zhǎng)度大于200m。礦體兩側(cè)圍巖蝕變發(fā)育,從內(nèi)到外形成透輝石化、綠簾石化和角閃石、陽(yáng)起石的蝕變分帶。礦石中金屬礦物主要是磁鐵礦和黃銅礦,脈石礦物主要為鈣鐵榴石、透輝石—次透輝石等。礦體產(chǎn)狀、礦石礦物組成、蝕變分帶等特征表明,礦體類型為矽卡巖型,但是與一般接觸交代矽卡巖礦床不同的是礦體周邊未見碳酸巖與巖體,不存在接觸交代的環(huán)境。綜合分析認(rèn)為該礦是一個(gè)典型的巖漿矽卡巖型礦床,其成因是深部形成的矽卡巖礦漿侵入到地殼淺部的構(gòu)造裂隙中,在結(jié)晶分異和自交代過程中形成的。拉伊克勒克隱伏富銅—鐵礦床及相鄰斑巖型銅多金屬礦床的發(fā)現(xiàn)說明綜合地球物理在覆蓋區(qū)找礦中能發(fā)揮重大作用,也擴(kuò)大了在東準(zhǔn)噶爾地區(qū)尋找矽卡巖型礦床的視野,同時(shí)也豐富了矽卡巖型銅鐵礦的形成機(jī)理。
[Abstract]:Ray Klerk copper ore deposit is a high grade deposit found recently in Qiongheba overburden area of East Junggar, Xinjiang. The average TFe content of ore body is more than 51%, accompanied by Au. it has the characteristics of shallow burial, high grade and high economic value. The discovery of the mine was first made by processing and analyzing the data of 1: 50, 000 ground gravity, magnetic force and induced electricity, and then the prospecting targets were selected, and then comprehensive geophysical exploration on a large scale was carried out, and it was found that there was a high magnetic field in the Quaternary covering area. The complex anomaly bodies with high density and high polarizability were drilled in the favorable areas, and the thick and concealed skarn copper-iron rich bodies were found in the first drill after exposing the Quaternary, and the iron resources and copper resources were obtained by the control of seven boreholes and the amount of iron resources was 2.45 Mt and the amount of copper resources was 44 kt. The orebody mainly occurs in the interlayer structural fractures of the Lower Devonian andesite and tuff with a thickness of 832 m and a length of more than 200 m. The wall rock on both sides of the orebody is altered to form diopside zone from inside to outside, green curtain petrifaction, hornblende and actinolite. The main metal minerals in the ore are magnetite and chalcopyrite, while the gangue minerals are mainly calcium iron garnet, diopside-subdiopside and so on. The characteristics of ore body occurrence, mineral composition and alteration zoning indicate that the orebody type is skarn type, but unlike the general contact metasomatic skarn deposit, there is no carbonatite and rock mass around the orebody, and there is no contact metasomatism environment. It is considered that this ore deposit is a typical magmatic skarn type deposit, and its genesis is formed during the process of crystallization differentiation and self-metasomatism, in which the skarn magma formed in the deep layer intruded into the structural fissure in the shallow part of the crust and formed during the process of crystallization differentiation and self-metasomatism. The discovery of Ray Klerk concealed copper-rich iron deposit and adjacent porphyry copper polymetallic deposit shows that comprehensive geophysics can play an important role in prospecting in overlying area, and has also expanded the field of vision for skarn type deposits in East Junggar area. At the same time, it enriches the formation mechanism of skarn copper-iron ore.
【作者單位】： 中國(guó)地質(zhì)科學(xué)院礦產(chǎn)資源研究所國(guó)土資源部成礦作用與資源評(píng)價(jià)重點(diǎn)實(shí)驗(yàn)室;
【基金】：新疆維吾爾自治區(qū)地質(zhì)勘查基金資助項(xiàng)目(編號(hào):A11-3-XJ4) 國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):41574133) 中國(guó)地質(zhì)調(diào)查局地質(zhì)項(xiàng)目(編號(hào):121201103000150009,1212011085024,12120113041300)的成果~~
【分類號(hào)】：P618.41;P618.31

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本文編號(hào)：1936086