本文選題：松樹(shù)溝鉻鐵礦　切入點(diǎn)：阿爾卑斯型超鎂鐵巖體　出處：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：松樹(shù)溝巖體為秦嶺造山帶出露面積最大的超鎂鐵巖體,前人對(duì)該區(qū)進(jìn)行了大量的勘查研究工作,在地表以下700m深度內(nèi)投入了大量的坑道及鉆探工程,并對(duì)控制的鉻鐵礦體進(jìn)行了開(kāi)采。很多學(xué)者對(duì)松樹(shù)溝巖體成因進(jìn)行了研究,存在蛇綠巖與阿爾卑斯型橄欖巖的不同認(rèn)識(shí)。對(duì)于松樹(shù)溝巖體的深部有沒(méi)有找礦潛力?以及在什么部位找礦?這些問(wèn)題都未解決。本論文選取松樹(shù)溝巖體為研究對(duì)象,在前人地質(zhì)找礦等研究成果總結(jié)的基礎(chǔ)上,通過(guò)野外實(shí)地考察,巖石、礦物分析,巖體和礦體三維建模,對(duì)松樹(shù)溝鉻鐵礦床成因、成礦模式、深邊部找礦潛力及找礦方法進(jìn)行了研究,主要成果如下:(1)松樹(shù)溝鉻鐵礦為高鉻型鉻鐵礦,賦存于松樹(shù)溝超鎂鐵巖體中。巖體主要由純橄欖巖和方輝橄欖巖組成,橄欖石為鎂橄欖石,其Mg/(Mg+Fe+Mn)=0.89~0.94(平均為0.92)、Fo=91~94、NiO=0.21~0.38%(平均0.31%);斜方輝石為頑火輝石,其En=91~94,Al2O3=0.33%。綜合研究認(rèn)為:巖體屬于阿爾卑斯型超鎂鐵巖體。(2)根據(jù)礦山343個(gè)鉆孔數(shù)據(jù)(長(zhǎng)度總計(jì)約10.8萬(wàn)米),應(yīng)用3DMine軟件建立了礦區(qū)三維模型,為深邊部成礦預(yù)測(cè)提供了可視化素材,并計(jì)算了松樹(shù)溝礦床地表以下700m深度的鉻鐵礦貧礦石量約616.91萬(wàn)噸(鉻鐵礦品位3%,含已知礦體)。(3)系統(tǒng)收集總結(jié)松樹(shù)溝鉻鐵礦床地質(zhì)、物探、化探資料,結(jié)合礦區(qū)三維建模及鉻鐵礦成礦理論,提出三個(gè)成礦預(yù)測(cè)區(qū)及一個(gè)成礦遠(yuǎn)景區(qū),分別為界嶺溝—干溝成礦預(yù)測(cè)區(qū)、干溝—小松樹(shù)溝段深部成礦預(yù)測(cè)區(qū)、洋淇溝—東溝段(巖體下盤(pán))成礦預(yù)測(cè)區(qū)和礦區(qū)外圍泥鰍凹成礦遠(yuǎn)景區(qū),并提出了找礦標(biāo)志與找礦方法。
[Abstract]:The Songshugou rock body is the ultramafic rock body with the largest exposed area in the Qinling orogenic belt. The predecessor has done a lot of exploration and research work in this area, and has invested a large number of tunnel and drilling projects in the depth of 700m below the surface of the earth's surface. Many scholars have studied the genesis of Songshugou rock body and there are different understandings between ophiolite and Alpine peridotite. And at what point? These problems have not been solved. In this paper, Songshugou rock mass is selected as the research object, based on the summary of previous geological prospecting and other research results, through field investigation, rock, mineral analysis, rock mass and orebody three-dimensional modeling, The genesis, metallogenic model, prospecting potential and prospecting methods of the Songshugou chromite deposit are studied. The main results are as follows: 1) the Songshugou chromite is a chromite of high chromium type. Occurring in the Songshugou ultramafic rock body. The body is mainly composed of pure peridotite and calcareite, olivine is mafic olivine, and its Mg/(Mg Fe MNO _ (0.89) O _ (0.94) (mean 0.92F _ (92) F _ (91)) NiO _ (0.21) O _ (0.38) (mean 0.31) peridotite is enstatite, and the clinopyroxene is an enstatite. It is considered that the rock mass belongs to the Alpine type ultramafic rock mass. Based on the data of 343 boreholes (total length of about 108000 meters), the 3D model of the mining area is established by using 3DMine software, which provides visual material for the deep side metallogenic prediction. The authors have also calculated that the amount of chromite lean ore at a depth of 700m below the surface of the Songshugou deposit is about 6.1691 million tons (chromite grade 3, including known ore bodies). The geological, geophysical and geochemical data of the Songshugou chromite deposit are summarized. In combination with 3D modeling and chromite metallogenic theory, three metallogenic prediction areas and one metallogenic prospect area are proposed, which are respectively Jieling Gou-Ganguo metallogenic prediction area and deep ore-forming prediction area of Gangou-Xiaosongshugou section. The ore-forming prediction area of Yangqou-Donggou section (rock body footwall) and the Loach depression in the periphery of mining area are discussed, and the prospecting marks and prospecting methods are put forward.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.3

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