本文選題：甘肅北山 + 斑巖型銅礦床　； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：公婆泉銅礦位于甘肅—蒙古北山銅礦成礦帶。前人對公婆泉銅礦的研究已經(jīng)取得了一批寶貴的成果和資料,但對該礦床缺乏較系統(tǒng)地質(zhì)和地球化學(xué)研究。本文以較多野外工作為基礎(chǔ),并與室內(nèi)緊密結(jié)合,研究該礦床的地質(zhì)地化特征及礦床成因,取得的主要認(rèn)識如下：1、礦區(qū)斑巖類型為花崗閃長斑巖和英安斑巖。兩類斑巖為高鉀鈣堿性系列巖石,微量元素蛛網(wǎng)圖和球粒隕石標(biāo)準(zhǔn)化分布形式基本一致,具有同源性。斑巖富集大離子親石元素(LILE),如Ba、Rb、Pb等元素均呈明顯的正異常,相對虧損Nb、Ta等高場強元素(HFSE)。2、公婆泉銅礦成礦流體包裹體表明：銅礦的含礦石英脈中廣泛發(fā)育4類流體包裹體：純氣相包裹體(Ⅰ型),純液相包裹體(Ⅱ型),原生富液相氣液兩相包裹體(Ⅲa型)以及次生富液相氣液兩相包裹體(Ⅲb型)。成礦溫度范圍250℃-500℃之間,鹽度峰值在2.0%-6.0%,密度范圍0.75～1.0g/cm3,表明成礦流體具有中高溫、低鹽度以及低密度特征。激光拉曼探針分析表明,液相成分以H2O為主；氣態(tài)成分以H2、N2、CH4為主。3、氫、氧、硫同位素分析表明,幔殼混合巖漿在上升、侵位時帶來了大量的成礦物質(zhì)Cu、S。巖漿分異出成礦流體沿著礦區(qū)構(gòu)造斷裂系統(tǒng)上升運移,由于壓力突然釋放造成含礦流體發(fā)生減壓沸騰導(dǎo)致相態(tài)分離,使流體中金屬卸載,減壓沸騰可能是導(dǎo)致流體中金屬卸載形成礦床的主要原因。
[Abstract]:The Gong Po spring copper deposit is located in the Gansu Mongolia Beishan copper mine metallogenic belt. The predecessors have obtained a lot of valuable achievements and data on the study of the Gong Po spring copper deposit, but it lacks systematic geological and geochemical studies on the deposit. The main understanding of the genesis of the bed is as follows: 1, the type of porphyry in the mining area is the granodiorite porphyry and the English an porphyry. The two type of porphyry is a high potassium calc alkaline series rock. The trace element cobweb map and the chondrite standard distribution form are basically the same and are homologous. The porphyry enriched large ion stone elements (LILE), such as Ba, Rb, and Pb, are all obvious. The positive anomalies, the relative loss of Nb, Ta and other high field strength elements (HFSE).2, the fluid inclusions in the Gong Po spring copper deposit indicate that 4 types of fluid inclusions are widely developed in the ore bearing vein of the copper ore: pure gas inclusions (type I), pure liquid inclusions (type II), primary rich liquid phase gas-liquid inclusions (type III a) and secondary rich liquid phase gas-liquid package The metallogenic temperature range is between 250 and -500 C, the peak of salinity is 2.0%-6.0% and the density range is 0.75 ~ 1.0g/cm3, indicating that the ore-forming fluid is characterized by middle temperature, low salinity and low density. The laser Raman probe analysis shows that the liquid component is mainly H2O, and the gaseous formation is based on H2, N2, CH4 as the main.3, hydrogen, oxygen, and sulfur isotope analysis shows that the mantle is the mantle. When the mixed magma is rising, a large amount of metallogenic material Cu is brought about by the emplacement, and the S. magma is separated out of the ore-forming fluid along the tectonic fault system of the mining area, and the pressure release of the fluid in the fluid is caused by the sudden release of pressure and the pressure release of the fluid in the fluid. The main reason for the deposit.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.41

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 何養(yǎng)珍,陳進(jìn)平,周繼強;甘肅公婆泉斑巖型銅礦床地球化學(xué)特征及找礦模式[J];桂林工學(xué)院學(xué)報;2000年03期

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本文編號：2035541