本文選題：構(gòu)造 + 礦化強(qiáng)度��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：膠東半島以焦家型金礦為主,其形成于120 Ma左右。焦家型金礦由于區(qū)域斷裂下盤水巖反應(yīng)而形成廣泛的蝕變和礦化。研究認(rèn)為這些金礦的連續(xù)礦化帶和貧礦帶受區(qū)域斷裂傾向、傾角改變形成的膨脹區(qū)所控制,而在連續(xù)的礦化帶內(nèi)發(fā)生強(qiáng)烈的水巖反應(yīng)。但是,對(duì)連續(xù)礦化帶內(nèi)構(gòu)造特征和水巖反應(yīng)如何影響礦化強(qiáng)度的研究較為局限。本次對(duì)膠東新立金礦進(jìn)行詳細(xì)的野外觀察,查明三山島-倉(cāng)上斷裂(F1)在大尺度控制新立金礦礦體分布。對(duì)主斷裂(F1)、次級(jí)斷裂(F2)斷層泥進(jìn)行X射線粉晶衍射分析得出,F1斷層泥主要由高嶺石和石英組成,含少量黃鐵礦、伊利石和石膏,F2斷層泥含有大量的石英和絹云母以及少量高嶺石和伊蒙混層。根據(jù)礦物共生關(guān)系和相圖,高嶺石是絹云母反應(yīng)形成的,伊利石由高嶺石轉(zhuǎn)化所致,伊蒙混層是高嶺石轉(zhuǎn)化為伊利石的中間產(chǎn)物,礦物之間的轉(zhuǎn)化反映了aK+或aK+/aH+連續(xù)減小。F1斷層泥的粒度分析得出其分布曲線呈單峰型、復(fù)式雙峰和三峰型,其粒度分布分維值為2.61-2.82,而F2斷層泥僅呈簡(jiǎn)單雙峰型,分維值為2.46-2.52,表明F1斷層泥組份經(jīng)歷顆粒旋轉(zhuǎn)磨蝕階段,F2斷層泥組份處于約束碾磨階段。F1斷層泥中大量的黏土礦物、高度分化的顆粒粒度以及定向的顯微構(gòu)造導(dǎo)致低的橫向滲透性,導(dǎo)致礦體只產(chǎn)出在F1下盤,F2為成礦后構(gòu)造。通過新立金礦礦體參數(shù)的分布及礦化樣式統(tǒng)計(jì),應(yīng)用分形模型和間隙度方式量化金濃度空間分布特征,進(jìn)而查明礦化強(qiáng)度分布及控制因素。在連續(xù)礦化帶內(nèi),各穿脈具有以下特征,(1)F1傾向、傾角改變與礦體厚度和線金屬量無關(guān);(2)穿脈內(nèi)強(qiáng)烈礦化區(qū)域通常是遠(yuǎn)離主斷裂面(通�？拷鲾嗔衙嫣幜严栋l(fā)育);(3)蝕變帶內(nèi)含金硫化物團(tuán)塊和脈通常具有一定的不規(guī)則和溶蝕邊;(4)閾值(分割低金濃度、低分維值和高金濃度、高分維值的濃度)和間隙度(評(píng)估金濃度空間分布均勻性的參數(shù))分別與礦體厚度和線金屬量呈正相關(guān)和負(fù)相關(guān)。綜合以上現(xiàn)象,我們認(rèn)為連續(xù)礦化帶內(nèi)水巖反應(yīng)是影響礦化強(qiáng)度的重要因素。隨著礦化等級(jí)增加,閾值增加,間隙度減小表明控制金沉淀的水巖反應(yīng)被增強(qiáng)且空間更加均勻分布。這些現(xiàn)象表明連續(xù)礦化帶控制金沉淀的水巖反應(yīng)具有空間自組織機(jī)制特征,這種機(jī)制已經(jīng)被廣泛的應(yīng)用到不同地質(zhì)作用過程。
[Abstract]:Jiaodong Peninsula is dominated by Jiaojia type gold deposit, which was formed at about 120 Ma. Jiaojia-type gold deposits are widely altered and mineralized due to the reaction of regional faults. It is considered that the continuous mineralization zones and the ore-poor zones of these gold deposits are controlled by the regional fault tendency and the swelling zone formed by the change of dip angle, while the strong water-rock reaction occurs in the continuous mineralization zone. However, the study of the structural characteristics in the continuous mineralization zone and how the water-rock reaction affects the mineralization intensity is limited. The detailed field observation of Xinli gold deposit in Jiaodong shows that Sanshando-Cangshang fault F1) controls the distribution of Xinli gold ore body on a large scale. The X-ray powder diffraction analysis of fault gouges from main faults and secondary faults shows that the fault gouges are mainly composed of kaolinite and quartz, and contain a small amount of pyrite. Illite and gypsum F 2 fault gouges contain a large amount of quartz and sericite, and a small amount of kaolinite and immonitic mixes. According to the mineral symbiosis relationship and phase diagram, kaolinite is formed by sericite reaction, Illite is caused by kaolinite transformation, and the immonitic layer is the intermediate product of kaolinite conversion to Illite. The transformation between minerals reflects the grain size analysis of fault gouge with continuous decrease of AK or AK / AH. The distribution curve is of single peak type, double peak type and three peak type. The fractal dimension of grain size distribution is 2.61-2.82, while that of F2 fault gouge is simple double peak type. The fractal dimension is 2.46-2.52, which indicates that the gouge components of F1 fault gouge are in the confined grinding stage and a large number of clay minerals are found in the gouge of F _ 1 fault. Highly differentiated particle size and directional microstructures lead to low transversal permeability, resulting in orebodies occurring only in F1 footwall and F2 as post-metallogenic structures. Based on the distribution of orebody parameters and mineralization patterns of Xinli gold deposit, the spatial distribution characteristics of gold concentration were quantified by fractal model and gap degree, and the distribution of mineralization intensity and the controlling factors were found out. In the continuous mineralization zone, each perforating vein has the following characteristics: 1. The change of inclination angle is not related to the thickness of orebody and the amount of line metal) the strong mineralization area in the vein is usually far away from the main fault surface (usually near the main fault surface where the fissures are developed) and the au sulphide masses and veins in the alteration zone usually have a certain amount of gold sulfides and veins. Irregular and corroded edges / 4) threshold (partition of low gold concentration, The low fractal dimension and high gold concentration and the concentration of high fractal dimension are positively and negatively correlated with the thickness of ore body and the linear metal content, respectively, and the gap degree (the parameter to evaluate the uniformity of gold concentration spatial distribution). In view of the above phenomena, we think that the water-rock reaction in the continuous mineralization zone is an important factor affecting the mineralization intensity. With the increase of mineralization grade and the increase of threshold value, the decrease of gap degree indicates that the water-rock reaction controlling gold precipitation is enhanced and the spatial distribution is more uniform. These phenomena indicate that the water-rock reaction controlled by gold deposits in the continuous mineralization zone has the characteristics of spatial self-organization mechanism which has been widely used in different geological processes.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.51

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 ;Multifractal Analysis of Element Distribution in Skarn-type Deposits in the Shizishan Orefield,Tongling Area,Anhui Province,China[J];Acta Geologica Sinica(English Edition);2008年04期

2 Richard J.Goldfarb;M.Santosh;;The dilemma of the Jiaodong gold deposits: Are they unique?[J];Geoscience Frontiers;2014年02期

3 苗來成,羅鎮(zhèn)寬,黃佳展,關(guān)康,N.J. McNaughton,D. I. Groves;Zircon Senstive High Resolution Ion Microprobe (SHRIMP) study of granitoid intrusions in Zhaoye Gold Belt of Shandong Province and its implication[J];Science in China(Series D:Earth Sciences);1997年04期

4 鄧軍,劉偉,孫忠實(shí),王建平,王慶飛,張群喜,韋延光;Evidence of mantle-rooted fluids and multi-level circulation ore-forming dynamics: A case study from the Xiadian gold deposit, Shandong Province, China[J];Science in China(Series D:Earth Sciences);2003年S1期

5 周新華;楊進(jìn)輝;張連昌;;膠東超大型金礦的形成與中生代華北大陸巖石圈深部過程[J];中國(guó)科學(xué)(D輯:地球科學(xué));2002年S1期

6 李厚民,毛景文,沈遠(yuǎn)超,劉鐵兵,張連昌;膠西北東季金礦床鉀長(zhǎng)石和石英的Ar-Ar年齡及其意義[J];礦床地質(zhì);2003年01期

，

本文編號(hào)：1940547