本文選題：礦床地質(zhì)特征 + 礦床成因　； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：卡爾卻卡銅礦位于青海省格爾木市烏圖美仁鄉(xiāng)，大地構(gòu)造位置屬于東昆侖造山帶西段，其內(nèi)發(fā)育一系列金屬礦床，本文主要對(duì)A（野拉賽）、B（索拉吉爾）兩個(gè)礦段進(jìn)行研究。 區(qū)內(nèi)出露的地層主要為灘間山群。區(qū)內(nèi)侵入體大面積分布，主要巖性為似斑狀黑云母二長(zhǎng)花崗巖和黑云母花崗閃長(zhǎng)巖。巖相學(xué)、年代學(xué)和巖石地球化學(xué)等研究表明：似斑狀黑云母二長(zhǎng)花崗巖形成于早石炭世，并且?guī)r體形成于同碰撞環(huán)境，古特提斯洋已經(jīng)閉合，已經(jīng)進(jìn)入陸內(nèi)造山階段；黑云母花崗閃長(zhǎng)巖形成于中三疊世，并且?guī)r體形成的構(gòu)造背景為俯沖環(huán)境。區(qū)內(nèi)斷裂構(gòu)造較發(fā)育，主要有北西西向斷裂和北東向斷裂兩組，其中北西西向斷裂組是區(qū)內(nèi)的主干構(gòu)造，多金屬礦體主要賦存于該組斷裂及其次一級(jí)構(gòu)造中。 A礦段共圈出蝕變帶3條，產(chǎn)于似斑狀黑云母二長(zhǎng)花崗巖體中。蝕變帶由破碎的似斑狀黑云母二長(zhǎng)花崗巖和后期的花崗細(xì)晶巖、石英脈組成，總體走向北西-南東向，傾向北東，傾角65°-80°之間。礦石類型以破碎帶蝕變巖型為主，也發(fā)育石英脈型。圍巖蝕變類型有高嶺土化、絹云母化、鉀化、硅化和綠泥石化等。B礦段共圈出矽卡巖帶4條（其中地表3條、深部1條），均產(chǎn)于花崗閃長(zhǎng)巖、似斑狀黑云母二長(zhǎng)花崗巖與灘間山群地層的接觸部位，總體走向北西西向，傾角20°-85°之間。礦石類型主要有含黝銅礦黃銅礦斑銅礦礦石、含黃銅輝鉬礦礦石、自然銅矽卡巖礦石和孔雀石化（含黃銅）磁鐵礦礦石四種類型(據(jù)勘探資料)。矽卡巖帶內(nèi)蝕變主要為矽卡巖化、透輝石化、綠泥石化、綠簾石化、硅化等。 實(shí)驗(yàn)結(jié)果顯示，卡爾卻卡A礦段成礦流體經(jīng)歷了由高鹽度到低鹽度的演化過(guò)程；氣液兩相包裹體溫度峰值區(qū)間為260~340℃，含CO2三相包裹體溫度峰值區(qū)間為340~360℃，成礦流體具有中高溫特征；成礦壓力范圍為51~97MPa，成礦深度集中于5.70~8.12km。成礦物質(zhì)中，硫以深源巖漿硫?yàn)橹�，并有少量圍巖硫參與，，也可能是成礦流體運(yùn)移的過(guò)程中從地殼物質(zhì)汲取各種成因硫。成礦流體來(lái)源以巖漿水為主，后期疊加有大氣降水等其他流體。綜合分析認(rèn)為，卡爾卻卡A礦段礦床成因類型為受線性斷裂構(gòu)造控制的中高溫?zé)嵋好}型銅礦床，B礦段礦床成因類型為典型的矽卡巖型銅礦床。 在綜合以上研究成果的基礎(chǔ)上對(duì)卡爾卻卡銅礦的礦化富集規(guī)律進(jìn)行歸納總結(jié)，A礦段礦體嚴(yán)格受NWW向斷裂控制，礦化與硅化關(guān)系最密切，與典型的斑巖型銅礦有嚴(yán)格區(qū)別；B礦段礦體受矽卡巖接觸帶和NWW向斷裂聯(lián)合控制，并且當(dāng)?shù)貙优c矽卡巖接觸帶大角度斜交時(shí)最易產(chǎn)生富礦體。
[Abstract]:Kartsoka copper deposit is located in Utumeren Township, Geermu City, Qinghai Province. The geotectonic position belongs to the western section of the East Kunlun orogenic belt, in which a series of metal deposits are developed. The outcropping strata in the area are mainly inter-beach mountain groups. In this area, the intrusions are distributed in large areas, and the main lithology is porphyry biotite monzogranite and biotite granodiorite. The petrographic, chronological and petrogeochemical studies indicate that the porphyry biotite binomorphic granites were formed in the early Carboniferous and formed in the same collision environment. The PaleoTethys ocean has been closed and has entered the intracontinental orogenic stage. Biotite granodiorite was formed in the Middle Triassic and formed in a subduction environment. There are two groups of faults in this area: NW-trending fault and NE-trending fault. The NW-trending fault group is the main structure in the area, and the polymetallic ore body mainly occurs in this group fault and its sub-primary structure. There are 3 alteration zones in a ore section, which are found in porphyry biotite monzonitic granites. The altered zone is composed of a broken porphyry biotite monzonitic granite and late granitic fine-grained rocks, quartz veins, with a general strike from NW to SE, trending to NW, with a dip angle of 65 擄-80 擄. The ore type is mainly altered rock type in broken zone, and quartz vein type is also developed. The alteration types of surrounding rock are kaolin, sericite, kalitization, silicification and green-mud fossilization. There are 4 skarn belts (3 on the surface and 1 in the deep, all occurring in granodiorite). The contact position between the porphyry biotite monzonitic granite and the strata of the Tanjianshan Group is generally NW trending, with a dip angle of 20 擄-85 擄. There are mainly four types of ore including chalcopyrite porphyrite, copper molybdenum ore, natural copper skarn ore and peacock magnetite ore (according to exploration data). The internal alteration of skarn zone is mainly skarn, diopside, green mud, green curtain, silicification and so on. The experimental results show that the ore-forming fluid in Kartsoka A ore section has undergone the evolution from high salinity to low salinity, the peak temperature range of gas-liquid two-phase inclusions is 260 ~ 340 鈩

本文編號(hào)：1819326