本文選題：鉬鉛鋅 + 成礦地質(zhì)背景　； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：千家地區(qū)位于海南島西南部,處于陵水-九所深大斷裂與白沙斷陷相交處。近年來,隨基礎(chǔ)地質(zhì)和小比例尺區(qū)域成礦規(guī)律研究的深入。海南島西南部發(fā)現(xiàn)眾多具有良好成礦前景的礦床(點(diǎn))。它們的分布具一定的區(qū)域規(guī)律:①礦床(點(diǎn))成因相似;②礦產(chǎn)多為鉬、錫、金、鉛、鋅金屬礦床(點(diǎn));③礦床(點(diǎn))分布與中生代巖漿-構(gòu)造運(yùn)動息息相關(guān),多集中分布在巖漿巖體邊緣或附近地層區(qū)中。千家地區(qū)在海南島西南部區(qū)域成礦大環(huán)境影響下,礦床(點(diǎn))類型及礦床成因與區(qū)域礦床類似;但亦顯示出一些鮮明的特點(diǎn):礦床(點(diǎn))往往分布于巖體內(nèi)。本文在前人研究成果的基礎(chǔ)上,結(jié)合野外地質(zhì)調(diào)查成果。綜合利用巖石學(xué)、礦床學(xué)、地球化學(xué)、地球物理學(xué)、礦物學(xué)、同位素地質(zhì)學(xué)及成礦規(guī)律與預(yù)測學(xué)等方法,探討千家地區(qū)成礦規(guī)律。首先以區(qū)域地質(zhì)背景為帶入點(diǎn),仔細(xì)了解區(qū)內(nèi)地質(zhì)情況。在此基礎(chǔ)上仔細(xì)對比石門山鉬鉛鋅礦、后萬嶺鉛鋅礦、看樹嶺銀礦。初步發(fā)現(xiàn)三類礦床有一些共性:礦化與晚期斑巖侵入活動相關(guān);礦床受南北、北西斷裂構(gòu)造控制明顯,礦體圍巖基本為花崗巖類;礦化與圍巖蝕變程度呈正相關(guān);礦石構(gòu)造常見浸染狀、細(xì)脈狀、角礫充填狀;礦床成因相關(guān)、成礦時(shí)間相近。這些共性極可能為成礦活動在研究區(qū)成礦地質(zhì)背景限制下,形成的一系列成因相似、時(shí)空相關(guān)的不同元素組合礦床(點(diǎn))。為此基于礦床(點(diǎn))仔細(xì)觀察,由點(diǎn)及面深入剖析研究區(qū)成礦地質(zhì)條件,探討區(qū)內(nèi)成礦規(guī)律,形成以下認(rèn)識:1.地層在區(qū)域上雖是重要成礦因素,但考慮到研究區(qū)內(nèi)礦床(點(diǎn))多分布在巖體內(nèi)且地層分布極其有限。為此地層不做為成礦主因考慮。2.區(qū)內(nèi)巖漿巖主要為花崗巖類巖漿多期侵入形成的千家?guī)r體及晚期沿?cái)嗔亚秩氲陌邘r。整個(gè)巖體符合華南地區(qū)含鉬鉛鋅礦巖體的基本地質(zhì)特征。巖體主微量元素顯示千家?guī)r體在成巖過程經(jīng)歷物化環(huán)境的變化,成巖后受強(qiáng)烈風(fēng)化作用;在這背景下侵入的晚期斑巖既能分異含鉬流體,還能驅(qū)動含礦流體在一定斷裂張性空間內(nèi)循環(huán)萃取鉛鋅成礦元素。3.南北-北西向斷裂活動時(shí)間與斑巖侵入時(shí)間耦合,斷裂張性空間為斑巖侵入和熱液成礦提供空間,同時(shí)斷裂的多期性使斷裂帶內(nèi)易形成一個(gè)半封閉系統(tǒng)有利于鉬、鉛、鋅富集沉淀。4.巖漿和構(gòu)造因素綜合影響下,垂向上礦化和蝕變帶呈現(xiàn)出深部與輝鉬礦伴生的面狀云英巖化蝕變帶,至淺部與鉛鋅礦伴生的脈狀絹云母化、硅化蝕變帶的立體組合。平面上由于斑巖侵入路徑不同;越靠近深部巖漿房頂部地區(qū)斑巖易分異出高溫流體,相應(yīng)的這也是區(qū)內(nèi)高溫礦化蝕變的分布區(qū)。5.斑巖及接觸圍巖中沒有發(fā)現(xiàn)UST石英說明了斷裂系統(tǒng)是半封閉環(huán)境。斑巖上侵并未伴隨來自巖漿房出溶的大量流體,所以區(qū)內(nèi)流體主要是由斑巖就位后出溶流體。巖漿冷凝早期出溶流體使鉬元素遷移并在壓力減小的環(huán)境影響下沉淀富集成礦。巖漿冷凝晚期出溶流體萃取鉛鋅并在溫度下降的環(huán)境影響下沉淀富集。
[Abstract]:A thousand areas are located in the southwestern part of Hainan Island, located at the intersection of the Lingshui - nine deep fault and Baisha fault depression. In recent years, a number of ore deposits (points) with good metallogenic prospects have been found in the southwest of Hainan Island. Their distribution has a certain regional law: (1) the deposit (point) Cheng Yinxiang 2. The mineral deposits are mostly molybdenum, tin, gold, lead and zinc metal deposits (points); (3) the distribution of deposits (points) is closely related to Mesozoic magma tectonic movement, mostly distributed in the edge of magma rock mass or in the vicinity of the formation zone. It also shows some distinct characteristics: ore deposits (points) are often distributed in rock mass. Based on the achievements of previous studies and combined with the results of field geological survey, the metallogenic regularity of thousands of areas is discussed by comprehensive utilization of petrology, mineral deposits, geochemistry, geophysics, mineralogy, isotopic geology and ore forming law and prediction. On the basis of regional geological background, we carefully understand the geological conditions in the area. On this basis, we carefully compare the Shimen mountain molybdenum lead zinc mine, the later Wan Ling lead zinc mine and the tree ridge silver deposit. It has been found that the three types of ore deposits have some common characteristics: mineralization is related to the late porphyry intrusion activities; the deposit is controlled by the north and south, the north west fault structure is obviously controlled, the rock base of the ore body This is a kind of granitoid; mineralization has a positive correlation with the degree of alteration of surrounding rock; the ore structure is usually disseminated, fine vein and breccia filling, and the genesis of the deposit is related to the similar mineralization time. Based on the careful observation of the deposit (point), the metallogenic geological conditions in the study area are deeply analyzed from point and surface, and the metallogenic regularity in the area is discussed. The following understanding is formed: Although the 1. stratum is an important metallogenic factor in the region, it is considered that the deposit (point) in the study area is mostly distributed in the rock mass and the distribution of the strata is extremely limited. It is considered that the magmatic rocks in the.2. area are mainly a thousand pluton intrusions of granitoid magma and late intrusive porphyry. The whole rock mass conforms to the basic geological features of the molybdenum lead and zinc ore bodies in Southern China area. The main trace elements of the rock mass show that thousands of rock masses have undergone changes in the physical environment of the diagenesis and strongly weathered after diagenesis. In this background, the intrusive late porphyry can not only divide the molybdenum containing fluid, but also drive the ore containing fluid in a certain fracture tensional space to circulate the lead and zinc metallogenic element.3., which is coupled with the porphyry intrusion time, and the fracture tensional space provides space for porphyry invasion and hydrothermal mineralization, and the multiple phases of the fracture are at the same time. It is easy to form 1.5 closed system in the fracture zone, which is beneficial to the comprehensive influence of molybdenum, lead and zinc enrichment and precipitation of.4. magma and tectonic factors. The vertical mineralization and alteration zone present a surface like mica alteration zone associated with the molybdenite, to the pulse sericite associated with the lead and zinc deposits, and the stereoscopic combination of the silicified alteration zone. Because the porphyry intrusion paths are different, the porphyry near the deep magmatic roof area is easily separated from the high temperature fluid, and this is also the distribution area of the high temperature mineralization and alteration in the region. The.5. porphyry and the contact surrounding rock do not find UST quartz indicating that the fracture system is semi enclosed environment. The porphyry intrusion does not accompany a large amount of magma dissolution. Fluid, so the fluid in the region is mainly from the porphyry, and the fluid is in place after the porphyry. The early magma condenses the fluid to migrate the molybdenum element and precipitate and enrich the mineralization under the influence of the pressure decreasing environment. The magma condenses the late dissolution fluid to extract lead and zinc and precipitates and enriches under the environment of temperature decline.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.4;P618.65

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本文編號：1917832