發(fā)布時間：2018-06-16 21:37

  本文選題：吉林蛟河 + 橄欖玄武巖　； 參考：《成都理工大學(xué)》2017年碩士論文

【摘要】：吉林蛟河橄欖石是我國除河北漢諾壩之外的第二大橄欖石產(chǎn)出礦區(qū),是重要的有色寶石礦區(qū)之一。筆者以吉林蛟河橄欖石作為研究對象,吉林蛟河大石河礦物為主要研究礦區(qū),通過手標(biāo)本特征、顯微特征、X射線熒光光譜分析、X射線粉晶衍射分析、傅里葉紅外光譜測試等方法,獲得本區(qū)橄欖玄武巖及橄欖巖包體的化學(xué)成分、礦物組成及結(jié)構(gòu)信息;通過寶石顯微鏡、折射儀、二色鏡等常規(guī)寶石學(xué)測試獲得吉林蛟河橄欖石的寶石學(xué)特征信息,補(bǔ)充吉林蛟河橄欖石礦床研究領(lǐng)域的不足。吉林蛟河橄欖巖礦床主要受敦化-密山斷裂帶的影響,為船底山期堿性粗面玄武巖。礦體內(nèi)含大量橄欖巖包體,呈粒狀結(jié)構(gòu)產(chǎn)出,礦床呈似層狀。橄欖玄武巖呈灰黑色角礫狀隱晶質(zhì)結(jié)構(gòu),可見氣孔構(gòu)造。玄武巖基質(zhì)為斑狀結(jié)構(gòu),含長石、橄欖石、輝石等礦物。玄武巖基質(zhì)中橄欖石呈渾圓粒狀結(jié)構(gòu),為地幔橄欖巖的破碎產(chǎn)物捕虜晶而非斑晶�？梢婇蠙焓�、輝石外圍多發(fā)生蝕變,常見雙晶及扭折帶,出現(xiàn)成分環(huán)帶。具環(huán)帶的礦物邊部成分接近玄武巖,核部成分又保留地幔的成分信息。寄主巖漿與捕虜晶之間有著元素轉(zhuǎn)移的關(guān)系。橄欖巖包體呈不等粒狀結(jié)構(gòu),含橄欖石、頑火輝石、透輝石、鉻鐵礦及尖晶石,為尖晶石二輝橄欖巖。橄欖石及頑火輝石多見雙晶及變形紋,透輝石呈艷綠色粒狀結(jié)構(gòu)。橄欖石根據(jù)顏色分為兩種,推測為兩個不同時期形成。吉林蛟河產(chǎn)出的寶石級橄欖石顏色綠色至黃綠色,透明-半透明,內(nèi)部含有暗色包體,睡蓮狀包體、負(fù)晶及裂隙,多色性很弱,相對硬度為6.52 Kg/mm2、相對密度為3.37g/cm3,折射率處于橄欖石范圍內(nèi)的中間部分,藍(lán)綠、紅橙區(qū)域有吸收光譜。玄武巖中的橄欖巖包體為幔源包體,在巖漿噴發(fā)前早已存在,經(jīng)歷過部分熔融。隨著船底山期火山活動頻繁,地幔流體交代熔融匯聚成的玄武巖巖漿攜帶橄欖巖包體噴出,形成吉林蛟河橄欖玄武巖礦床。
[Abstract]:Jiaohe olivine in Jilin Province is the second largest olivine producing area in China besides Hanoba in Hebei Province. It is one of the important non-ferrous gemstone mining areas. The author takes Jiaohe olivine as the research object and Jiaohe Dashihe mineral as the main mining area. Through the characteristics of hand specimens and microscopic features, the X-ray powder diffraction analysis is carried out by X-ray fluorescence spectroscopy. The chemical composition, mineral composition and structure of olivine basalt and peridotite inclusions were obtained by Fourier transform infrared spectroscopy. Conventional gemological tests such as dichromatic mirror have obtained the information of gemological characteristics of olivine in Jiaohe, Jilin Province, which complements the deficiency in the research field of Jiaohe olivine deposit in Jilin Province. The Jiaohe peridotite deposit in Jilin Province is mainly influenced by Dunhua-Mishan fault zone and belongs to basalt of basalt. There are a lot of peridotite inclusions in the ore body, and the ore deposit is stratiform. Olivine basalts have a gray-black breccia cryptic structure and a stomatal structure. Basalt matrix is porphyry structure, containing feldspar, olivine, pyroxene and other minerals. Olivine in basalt matrix has a round granular structure, which is a cataclastic product of mantle peridotite rather than porphyry. Olivine, pyroxene periphery of the alteration, common double crystal and torsion band, the composition of the ring zone. The mineral edge of the annular belt is close to basalt, and the nuclear component retains the information of mantle composition. There is an element transfer relationship between host magma and xenocryst. The peridotite xenoliths, which contain olivine, enstatite, diopside, chromite and spinel, are spinel peridotite. Olivine and enstatite are mostly dicrystalline and deformed, diopside is green granular structure. Olivine is divided into two types according to color, presumably formed in two different periods. Jilin Jiaohe produced gemstone grade olivine color green to yellowish green, transparent-translucent, inside contain dark color inclusion, water lily shape inclusion, negative crystal and fissure, multicolor is very weak, The relative hardness is 6.52 kg / mm ~ (-2), the relative density is 3.37 g / cm ~ (-3), the refractive index is in the middle part of the range of olivine, blue and green, red orange region have absorption spectrum. The peridotite xenoliths in basalt are mantle xenoliths which existed long before magma eruption and experienced partial melting. With the frequent volcanic activity in the Chuandishan period, the mantle fluid metasomatism and melt converging basalt magma exhaled peridotite inclusions and formed the Jiaohe olivine basalt deposit in Jilin province.
【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】：2017
【分類號】：P588.125;P619.28

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