本文選題：含銅鎳礦鎂鐵-超鎂鐵巖體 + 侵入期次　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：自上世紀(jì)70年代以來,新疆東天山地區(qū)庫(kù)姆塔格沙垅以東地區(qū)發(fā)現(xiàn)了大量的鎂鐵-超鎂鐵巖體和巖漿銅鎳硫化物礦床,但是在沙垅以西地區(qū)沒有大的找礦突破。白鑫灘及路北含銅鎳礦鎂鐵-超鎂鐵巖體為近幾年在庫(kù)姆塔格沙垅以西地區(qū)發(fā)現(xiàn)的巖漿銅鎳硫化物礦床,研究工作薄弱,本文通過對(duì)白鑫灘及路北含銅鎳礦鎂鐵-超鎂鐵巖體的巖石學(xué)、年代學(xué)、巖石地球化學(xué)、S同位素、Sr-Nd同位素和O-Hf同位素分析來解釋其巖石及礦床成因。白鑫灘巖體不同巖相中礦物的粒徑和含量的變化規(guī)律說明巖體為三期巖漿侵入作用形成,第一期為頂部的角閃輝長(zhǎng)巖;第二期的橄欖輝長(zhǎng)巖、斜長(zhǎng)二輝橄欖巖和含長(zhǎng)橄欖二輝巖,礦物種類相同,含量呈漸變關(guān)系;巖體底部為第三期侵入的角閃輝長(zhǎng)巖,礦物粒徑相對(duì)頂部的角閃輝長(zhǎng)巖較小。白鑫灘巖體與黃山東、黃山西巖體具有相似的稀土元素和微量元素配分型式,大離子親石元素(Rb、Ba、U、K)相對(duì)富集,而部分高場(chǎng)強(qiáng)元素(Nb、Ta、Ti)相對(duì)虧損,稀土元素呈輕稀土略微富集的右傾樣式,均表現(xiàn)出島弧火山巖的地球化學(xué)性質(zhì),εNd(t)值(2.84~5.05)和(87Sr/86Sr)(t)值(0.704113~0.705682)介于軟流圈地幔與巖石圈地幔之間。但是與黃山東、黃山西巖體相比,白鑫灘巖體不相容元素含量更高,且εNd(t)值更低,(87Sr/86Sr)(t)值更高,還具有較高的La/Nb(2.00~3.33),較低的La/Ba(0.02~0.15),這些特征說明白鑫灘巖體的原始巖漿為巖石圈與軟流圈物質(zhì)相互作用的產(chǎn)物,且白鑫灘巖體的原始巖漿中軟流圈物質(zhì)相對(duì)于黃山東和黃山西巖體加入的比例更小。路北巖體不同巖相礦物含量的變化規(guī)律、鋯石U-Pb定年結(jié)果說明巖體為兩期巖漿侵入作用形成,第一期為斜長(zhǎng)二輝橄欖巖和橄欖輝石巖;第二期為輝長(zhǎng)巖。路北巖體與黃山東、黃山西巖體具有相似的稀土元素和微量元素配分型式,微量與稀土元素總量略高于黃山東,與黃山西基本一致,表現(xiàn)為大離子親石元素(Rb、Ba、U、Sr)相對(duì)富集,而部分高場(chǎng)強(qiáng)元素(Nb、Ta、Ti)相對(duì)虧損。這些特征說明路北巖體與黃山東、黃山西巖體相同,母巖漿都可能來自于受俯沖流體交代地幔的部分熔融。白鑫灘橄欖輝長(zhǎng)巖年齡為287±3Ma,路北輝長(zhǎng)巖年齡為277.8±3.4Ma,晚于該地區(qū)蛇綠巖(336-503Ma)、島弧火山巖(320~322Ma)、島弧花崗巖(316~328Ma)和含礦斑巖侵入體(326~334Ma)的年齡,與A型花崗巖和雙峰式火山巖(284~294Ma)的年齡基本一致,而且白鑫灘與路北巖體單斜輝石的化學(xué)成分與拉張裂谷環(huán)境的堆晶巖相似,因此推斷白鑫灘與路北巖體形成于后碰撞拉張環(huán)境。巖漿巖及同位素特征顯示橄欖石等礦物的結(jié)晶分異作用可能是促使白鑫灘和路北巖漿中硫達(dá)到飽和的因素,也可能存在巖漿同化混染地殼圍巖而使硫化物達(dá)到飽和并促使硫化物發(fā)生熔離。在后碰撞拉張環(huán)境下,東天山地區(qū)經(jīng)歷了巖石圈加厚拆沉,軟流圈地幔物質(zhì)上涌,巖石圈地幔物質(zhì)發(fā)生部分熔融,從而形成玄武質(zhì)巖漿。這些玄武質(zhì)巖漿斷裂上侵,橄欖石等礦物發(fā)生結(jié)晶分異,從而形成白鑫灘及路北鎂鐵-超鎂鐵質(zhì)巖體,同時(shí)由于地殼物質(zhì)混染的影響,硫化物發(fā)生飽和并產(chǎn)生熔離作用,硫化物珠滴被不斷上涌的巖漿帶人到巖漿平緩處,聚集沉降成礦體,即形成了白鑫灘和路北銅鎳硫化物礦床。
[Abstract]:Since the 70s of last century, a large number of mafic ultramafic and magmatic copper nickel sulfide deposits have been found in the eastern Tianshan area, east of Xinjiang, but there are no major breakthroughs in the west of the sand ridge. The white and lukinites, the copper nickel ore, the magnesium iron and the ultramafic rocks are in the west of Kum Tagg Shah Rang in recent years. The discovery of magma copper nickel sulfide deposit is weak. In this paper, the lithology, chronology, geochemistry, S isotopes, Sr-Nd isotopes and O-Hf isotopes of the mafic and ultramafic rocks in Bai Xin Tan and Lubei bearing copper nickel ore are analyzed to explain their rock and ore deposits. The variation of the quantity shows that the rock mass is formed by the three phase of magma intrusion, the first stage is the hornblende gabbro on the top, the second olivine gabbro, the long two glow peridotite and the olivine two pyroxenite, the mineral species are the same, the content shows a gradual change, and the bottom of the rock mass is a third phase of the amphibolite, the mineral particle size relative to the top of the hornblinde. The gabbro is smaller. The Bai Xin beach rock mass is similar to the Yellow Shandong and Mount Huangshan Western rocks with a similar distribution pattern of rare earth elements and trace elements, and the large ionic stone elements (Rb, Ba, U, K) are relatively rich, while some of the high field and strong elements (Nb, Ta, Ti) are relatively deficient, and the rare earth elements are slightly enriched in light dilute soil, showing the geochemistry of the island arc fire rocks. The Nd (T) value (2.84~5.05) and (87Sr/86Sr) (T) value (0.704113~0.705682) are between the asthenosphere mantle and the lithosphere mantle. But compared with the Yellow Shandong and Mount Huangshan Western rocks, the white Xin beach rock mass has higher content of incompatible elements, lower Nd (T), (87Sr/86Sr) (T) higher, and higher La/Nb (2.00~3.33). 0.15) these characteristics indicate that the original magma of the Bai Xin Tan rock mass is the product of the interaction of the lithosphere and the asthenosphere, and the proportion of the soft fluid in the original magma of the Bai Xin Tan rock mass is smaller than that of the Yellow Shandong and the western Mount Huangshan rock mass. The variation of the mineral content of the different lithofacies in the Lubei rock mass, and the zircon U-Pb dating results to illustrate the rock The body is formed by two phases of magma intrusion, the first phase is the long two glow peridotite and olivine pyroxenite, and the second phase is gabbro. The Lubei rock mass is similar to the Yellow Shandong and Mount Huangshan Western rocks with rare earth elements and trace elements. The amount of trace and rare earth elements is slightly higher than that of the Yellow Shandong, which is basically consistent with the western Mount Huangshan, showing the large ionic affinity. Shi Yuansu (Rb, Ba, U, Sr) is relatively rich, while some of the high field and strong elements (Nb, Ta, Ti) are relatively deficient. These characteristics indicate that the Lubei rock mass is the same as the Yellow Shandong and Mount Huangshan West Rock, and the parent magma may come from partial melting of the subducted fluid metasomatism. The age of the white Xin beach olivine gabbro is 287 + 3Ma, and the age of the luperyte gabbro is 277.8 + 3.4Ma. The age of the ophiolite (336-503Ma), island arc volcanic rock (320~322Ma), island arc granite (316~328Ma) and ore bearing porphyry intrusion (326~334Ma) is basically the same as the age of A type granite and Shuangfeng type volcanic rock (284~294Ma), and the chemical composition of the clinopyroxene in Bai Xin Tan and Lubei rock mass is similar to that of the rift valley. Therefore, it is inferred that the white Xin beach and the Lubei rock mass are formed in the post collision tension environment. The magmatic and isotopic characteristics show that the crystallization differentiation of the olivine and other minerals may be the factors contributing to the saturation of sulfur in the magma of Bai Xin beach and Lubei magma, and may also exist in the magma assimilation of the surrounding rock of the crust to saturate the sulfide and promote the sulfide hair. In the post collision and stretching environment, the East Tianshan region experienced the lithosphere thickening and subsidence, the soft flow mantle material upwelling and the partial melting of the lithosphere mantle material, resulting in the formation of basaltic magma. These basaltic magmas were invaded and the minerals such as olivine were crystallized and differentiated, thus forming white Xin Beach and luthinite ultramafic iron. The pluton, at the same time, is saturated and melted by the contamination of the crustal material, and the droplets of the sulfide beads are continuously upwelling to the gentle place of the magma, and accumulate and settle into the orebodies, that is, the Bai Xin beach and Lubei copper nickel sulfide deposits have been formed.

【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.41;P618.63

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