本文選題：中天山南緣 + 地球化學(xué)特征�。� 參考：《新疆大學(xué)》2015年碩士論文

【摘要】：中天山地塊位于天山山脈中部,經(jīng)過前人的研究,一般認(rèn)為中天山是一個(gè)位于準(zhǔn)噶爾板塊與塔里木板塊之間的一個(gè)微陸塊,該陸塊總體呈一西部較略寬,向東逐漸變窄的楔形,經(jīng)過庫米什,向東逐漸尖滅。在板塊相互作用下,自晚古生帶開始,南天山洋盆開始向北俯沖于中天山地塊之下,致使中天山南緣形成了一系列與俯沖一碰撞有關(guān)的基性、超基性-中性-酸性的火山巖及侵入巖,并影響了本區(qū)晚古生帶以來不同類型礦床的產(chǎn)出。彩華溝鉬礦即產(chǎn)于中天山微陸塊南緣NWW向花崗巖帶上。本文行文前充分收集了前人資料并進(jìn)行了詳盡的野外地質(zhì)工作,以新疆托克遜縣庫米什地區(qū)區(qū)域地質(zhì)背景、構(gòu)造演化及與鉬礦有關(guān)的巖漿巖的地球化學(xué)特征為基礎(chǔ),詳細(xì)研究了彩華溝鉬礦的礦床地質(zhì)特征、礦體地質(zhì)特征、巖漿巖地球化學(xué)特征,并初步總結(jié)了礦床的成礦模式,最后結(jié)合區(qū)域地質(zhì)背景、區(qū)域地質(zhì)構(gòu)造及區(qū)域地質(zhì)演化規(guī)律及斑巖型鉬礦的成礦條件及規(guī)律等方面的分析,對(duì)庫米什地區(qū)鉬礦化遠(yuǎn)景作出推斷。庫米什自晚古生帶開始依次經(jīng)歷了弧后擴(kuò)張-俯沖-碰撞-后期拉張回返四個(gè)時(shí)期的地質(zhì)運(yùn)動(dòng),構(gòu)成了一個(gè)各階段發(fā)育比較全面的威爾遜旋回,后期受走滑構(gòu)造作用形成拉分盆地。其中南天山洋盆向北俯沖斜插到中天山地塊之下及其與之碰撞階段為本區(qū)各類巖漿巖的主要活動(dòng)階段,也是本區(qū)的主要成礦階段,板塊間的俯沖碰撞及巖漿巖的二次蒸騰作用控制了區(qū)內(nèi)銅鉛鋅多金屬礦床、鎢礦、鉬礦等礦床的形成。彩華溝二云母二長(zhǎng)花崗斑巖與鉬礦化關(guān)系密切,陳超等在研究忠寶鎢礦時(shí)利用鋯石U-Pb法獲得其侵入年齡為298士3.2Ma,屬晚石炭世。地球化學(xué)特征表明忠寶二云母二長(zhǎng)花崗巖為具有中等-高的分異演化程度的高鉀鈣堿性過鋁質(zhì)花崗巖,為形成于同碰撞環(huán)境的殼源重熔S型花崗巖,源巖為中天山前寒武系基底。巖體中鉬元素主要來自熔融之后的巖漿及二次蒸騰時(shí)流體對(duì)圍巖的萃取。野外觀察及室內(nèi)研究表明,彩華溝鉬礦床為斑巖型鉬礦床,并伴有云英巖化、黃鐵礦化、硅化及鉀化。鉬礦產(chǎn)于花崗斑巖內(nèi),礦體產(chǎn)出于庫米什背斜東部?jī)A伏端深部的花崗斑巖內(nèi),背斜轉(zhuǎn)折端及兩翼形成許多次級(jí)小褶皺,相鄰巖層相對(duì)滑動(dòng)致使褶皺的樞紐及兩翼部分常形成層狀、似層狀、馬鞍狀剝離空洞,有利于巖體進(jìn)入圍巖進(jìn)行矽卡巖交代。這就是其上部形成矽卡巖型鎢礦床的原因。背斜南翼地層受NE向斷裂破壞從而為巖漿侵入提供了通道及侵入空間,后期近SN向斷裂構(gòu)造多為對(duì)礦體的后期改造,由于彩華溝鉬礦床埋藏較深及開展的地質(zhì)工作有限,彩華溝鉬礦床是否收到上述地質(zhì)條件影響尚不明確。礦石礦物組分與結(jié)構(gòu)構(gòu)造:礦石中礦石礦物主要為黃鐵礦、輝鉬礦、次為黃銅礦、少量方鉛礦、磁黃鐵礦、白鎢礦、孔雀石。脈石礦物主要為黑云母、白云母、石英、斜長(zhǎng)石、鉀長(zhǎng)石、鈉長(zhǎng)石等。巖石結(jié)構(gòu)主要為斑狀、似斑狀結(jié)構(gòu)、塊狀構(gòu)造。成礦作用按先后順序可劃分為鉀長(zhǎng)石-氧化物-硫化物期、云英巖-硫化物期、青磐巖-氧化物期。其中鉀長(zhǎng)石-氧化物-硫化物期及云英巖-硫化物期為主要的成礦階段。
[Abstract]:The Middle Tianshan massif is located in the middle of the Tianshan Mountains. Through previous studies, it is generally believed that the Middle Tianshan Mountain is a micro block between the Junggar plate and the Tarim plate. The block, which is slightly wider in the west, narrowed to the East, gradually narrowed into the East, and gradually pointed out eastward through Kumish. In the beginning, the South Tianshan ocean basin began to subduction to the Middle Tianshan massif, causing a series of subduction related basic, ultrabasic acid volcanic rocks and intrusive rocks in the southern margin of the Middle Tianshan Mountains, and affecting the output of different types of deposits since the late Paleozoic zone in this area. The color Hua Gou molybdenum mine was produced in the southern margin of the Middle Tianshan micro block NWW. In this paper, we have fully collected the previous data and carried out a detailed field geological work. Based on the regional geological background, tectonic evolution and the geochemical characteristics of the magmite related to molybdenum ore, the geological features and geological features of the orebody are studied in detail. The geochemical characteristics of magmatic rocks are made and the metallogenic model of the deposit is preliminarily summarized. Finally, based on the analysis of regional geological background, regional geological structure and regional geological evolution and the metallogenic conditions and laws of porphyry molybdenum ore, the prospect of molybdenum mineralization in Kumish area is inferred. Kumish has been in turn from the beginning of the late Paleozoic zone. The geological movement of four periods of post arc expansion - subduction - collision - later extension and return, formed a relatively comprehensive Wilson cycle in each stage, and later subjected to a strike slip structure to form a pull apart basin. At the stage of activity, it is also the main metallogenic stage in this area. The subduction collision between plates and two transpiration of magmatic rocks control the formation of copper lead zinc polymetallic deposit, tungsten ore, molybdenum ore and so on. The two mica two long granite porphyry in color Hua Gou is closely related to molybdenum mineralization. Chen superclass is obtained by using zircon U-Pb method in the study of Zhong Bao tungsten ore. Its invasion age is 298 3.2Ma and belongs to the Late Carboniferous. The geochemical characteristics indicate that Zhongbao two mica two granites are high potassium calcium alkaline peraluminous granites with moderate to high differentiation and evolution degree, which are formed in the crust source remelting S type granite in the same collision environment, and the source rocks are the basement of the Cambrian in the middle of the central mountain. Molybdenum elements are mainly in the rock mass. The extraction of the magma after melting and the extraction of the fluid to the surrounding rock during the two transpiration. Field observation and laboratory studies show that the color Hua Gou molybdenum deposit is a porphyry molybdenum deposit, accompanied by cloud and quartz, pyrite mineralization, silicification and potassium. The molybdenum ore occurs in the granite porphyry, and the ore body is produced in the granite porphyry in the deep dipping end of the Kumish anticline, and the anticline turns. The folding end and the two wings formed a number of secondary small folds, and the adjacent strata relative sliding resulted in the formation of the pivot and the two wings of the folds, such as lamellar, saddle like peeling holes, favorable for the rock mass entering the surrounding rock and metasomatism of skarn rocks. This is the cause of the formation of a skarn tungsten deposit in the upper part of the anticline. The south wing of the anticline is damaged by the NE fault. For the intrusion of magma, the passage and intruding space are provided, and the late SN trending fault structure is mostly the later transformation of the ore body. Because of the deep buried and limited geological work in the color Hua Gou molybdenum deposit, it is not clear whether the color of the color Hua Gou molybdenum deposit has been affected by the above geological conditions. Ore mineral composition and structural structure: ore minerals are the main ore minerals. Pyrite, molybdenite, secondary chalcopyrite, a small amount of galena, pyrrhotite, scheelite, and malachite. The gangue minerals are mainly black mica, muscovite, quartz, plagioclase, potassium feldspar, and albite. The rock structure is mainly porphyritic, porphyritic and massive, which can be divided into potash feldspar oxide sulfide phase in sequence. The Yunnan Yunnan sulfide period, the blupan rock oxide stage, is the main metallogenic stage of potash feldspar oxide sulphide period and cloud rock sulfide period.

【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.65;P588.1

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本文編號(hào)：1836228