本文選題：石墨礦 + 熱接觸變質(zhì)��； 參考：《地學(xué)前緣》2017年05期

【摘要】：石墨的礦物學(xué)特征研究是揭示石墨礦化成因機(jī)制的重要途徑。在對(duì)內(nèi)蒙古新發(fā)現(xiàn)的大烏淀特大型晶質(zhì)石墨礦進(jìn)行成因分析時(shí),通過(guò)電子顯微鏡、掃描電鏡、拉曼光譜、X射線粉晶衍射及碳同位素等石墨礦物特征分析手段,證實(shí)其石墨礦物已具備完整晶型,晶體片徑長(zhǎng)度20~70μm,厚度30~50nm,石墨礦化度在75以上。另外,結(jié)合礦床地質(zhì)及礦物組合等方面的證據(jù),初步判定該石墨礦具有熱接觸變質(zhì)成因特征。礦床形成于中溫低壓弱還原環(huán)境中,礦化變質(zhì)溫度為520~600℃。在早二疊世中酸性巖漿熱液的烘烤作用下,中元古界白云鄂博群尖山組地層中的有機(jī)碳發(fā)生變質(zhì)結(jié)晶形成石墨礦化,富鋁質(zhì)成分重結(jié)晶為紅柱石。石墨礦化品質(zhì)與距離巖體遠(yuǎn)近、熱傳導(dǎo)系統(tǒng)圈閉性、后期變質(zhì)作用疊加及原巖碳質(zhì)成分的結(jié)構(gòu)含量等因素有關(guān)。
[Abstract]:The study of the mineralogical characteristics of graphite is an important way to reveal the genetic mechanism of graphite mineralization. During the genetic analysis of the newly discovered ultralarge crystalline graphite ore in Dawudan, Inner Mongolia, the characteristics of graphite minerals were analyzed by means of electron microscope, scanning electron microscope, Raman spectrum X-ray powder diffraction and carbon isotope, etc. It is proved that the graphite mineral has a complete crystal form, the diameter of the crystal is 2070 渭 m, the thickness is 30 ~ 50 nm, and the degree of graphite mineralization is more than 75. In addition, combined with the geological and mineral assemblage of the ore deposit, it is preliminarily determined that the graphite ore has the characteristics of thermal contact metamorphism. The deposit was formed in the medium temperature and low pressure weakly reduced environment, and the mineralization metamorphic temperature was 520 ~ 600 鈩，

本文編號(hào)：2009469