本文關(guān)鍵詞： 銅山斑巖礦床 銅山斷裂 變形特征 蝕變帶-礦化體重建　出處：《巖石學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：黑龍江銅山銅礦床系多寶山銅礦田的重要組成部分,它和多寶山礦床同是中亞造山帶東段最古老的斑巖銅礦床(奧陶紀(jì))。銅山斷裂為銅山斑巖銅礦床內(nèi)最為重要的一條成礦后斷裂,它截切礦體和蝕變帶,因而導(dǎo)致礦化中心、深部找礦方向不明�，F(xiàn)階段的研究對(duì)其運(yùn)動(dòng)學(xué)特征還存有較大爭(zhēng)議,缺乏對(duì)該帶變形特征與性質(zhì)的細(xì)致觀察與鑒別。據(jù)此,本文開展詳細(xì)地野外及室內(nèi)研究工作,取得如下新認(rèn)識(shí):1)銅山斷裂為近東西走向的壓扭性斷裂,最典型的構(gòu)造幾何學(xué)特征為發(fā)育北東-北東東走向劈理、構(gòu)造透鏡體、以及巖脈及熱液脈扭曲現(xiàn)象。2)斷裂帶內(nèi)石英、黃銅礦、黃鐵礦、閃鋅礦的鏡下變形特征和石英C軸組構(gòu)特征顯示低溫變形條件,依據(jù)礦物和巖石變形特點(diǎn)判斷銅山斷裂主體為脆性斷裂。3)構(gòu)造解析表明銅山斷裂運(yùn)動(dòng)學(xué)特征為:上盤由南東向北西方向斜向逆沖。綜合斷裂上、下盤地質(zhì)體界線、蝕變和脈系分布特征等,判斷上盤相對(duì)下盤大致沿NW320°方向水平移動(dòng)距離700~800m,垂向抬升550~700m,錯(cuò)開蝕變外帶(青磐巖化帶、石英-絹云母-伊利石-綠泥石化帶)和礦化帶。4)銅山斷裂的次級(jí)斷裂截切了中晚三疊世白云母花崗巖,推測(cè)銅山斷裂活動(dòng)時(shí)限晚于中晚三疊世。5)復(fù)原銅山斷裂上盤和下盤的空間位置至銅山斷層活動(dòng)前,重建銅山銅礦床蝕變帶-礦化體,初步判斷銅山斷裂活動(dòng)前銅山礦床為紡錘形態(tài)。根據(jù)重建后礦化和蝕變的分布規(guī)律推斷下盤Ⅲ號(hào)礦體的南側(cè)位置應(yīng)有尚未發(fā)現(xiàn)的成礦斑巖和礦體,為深部找礦提供了依據(jù)。
[Abstract]:The Tongshan copper deposit in Heilongjiang province is an important part of the Dobaoshan copper deposit. It is the oldest porphyry copper deposit in the eastern part of the Central Asian orogenic belt (Ordovician). The Tongshan fault is the most important post-metallogenic fault in the Tongshan porphyry copper deposit. As a result, the direction of deep prospecting in the mineralization center is not clear. The present research on the kinematic characteristics of the zone is still controversial and lacks careful observation and identification of the deformation characteristics and properties of the zone. In this paper, detailed field and laboratory studies have been carried out to obtain the following new understanding: 1) the Tongshan fault is a compression-torsional fault with a nearly east-west strike, and the most typical structural geometry is the cleavage of the east-north strike. The deformation characteristics of quartz, chalcopyrite, pyrite and sphalerite in the fault zone and the texture of quartz C-axis in the tectonic lens, as well as in the twisting of the veins and hydrothermal veins, show the low temperature deformation conditions. According to the characteristics of mineral and rock deformation, the main body of Tongshan fault is brittle fault. 3) structural analysis shows that the kinematics characteristics of Tongshan fault are as follows: the upper face is inclined thrust from south east to north west, and the Synthetical fault is on. The geological boundary, alteration and the distribution characteristics of vein system in the lower face are estimated to be 700 ~ 800m and 550 ~ 700m, respectively, and the distance of horizontal movement of the upper face relative to the footwall is about 700 ~ 800m along the direction of NW320 擄, and the vertical uplift is 550 ~ 700m. The secondary faults of the Tongshan fault in the staggered alteration outer zone (Qingwanglianlization zone, quartz-sericite Illite-green mud petrochemical belt) and mineralized zone. 4) cut off the Middle-Late Triassic Muscovite granite. It is inferred that the time limit of Tongshan fault activity is later than that of middle and late Triassic. 5) the spatial position of upper and lower face of Xiongtongshan fault is before the Tongshan fault, and the alteration zone-mineralization body of Tongshan copper deposit is reconstructed. According to the distribution law of mineralization and alteration after reconstruction, it is inferred that there should be ore-forming porphyry and ore-body that have not been discovered in the south side of orebody 鈪，

本文編號(hào)：1460521