本文選題：資源分布　切入點(diǎn)：區(qū)域變質(zhì)　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：天然晶質(zhì)石墨礦產(chǎn)是我國(guó)重要的大宗優(yōu)勢(shì)非金屬礦產(chǎn),是傳統(tǒng)工業(yè)和戰(zhàn)略新興產(chǎn)業(yè)所必須的礦物原料。目前我國(guó)的石墨資源處于比較尷尬的地位:低價(jià)出口石墨原料,高價(jià)進(jìn)口石墨產(chǎn)品,這種貿(mào)易的逆差造成我國(guó)的天然石墨資源過(guò)度開采和浪費(fèi)。黑龍江省是我國(guó)晶質(zhì)石墨儲(chǔ)量最大的省份,省內(nèi)的礦床類型主要為區(qū)域變質(zhì)型,且礦床規(guī)模較大,目前已經(jīng)發(fā)現(xiàn)的石墨礦床包括礦產(chǎn)地在內(nèi)54處,其中超大型石墨礦床有三處。通過(guò)對(duì)省內(nèi)石墨礦產(chǎn)地資料的收集和制圖,發(fā)現(xiàn)省內(nèi)的石墨礦床主要分布在佳木斯地塊,即雞西-雙鴨山-蘿北一帶。區(qū)域變質(zhì)型石墨礦床又以鱗片大的為優(yōu)質(zhì)礦產(chǎn),其中蘿北云山石墨礦床號(hào)稱“亞洲第一大石墨礦床”。黑龍江省的晶質(zhì)石墨礦床的賦礦地層主要以前寒武老的變質(zhì)巖系,賦礦地層的區(qū)域變質(zhì)程度一般達(dá)到角閃巖相和麻粒巖相。石墨礦床的礦體產(chǎn)狀和圍巖產(chǎn)狀一致表現(xiàn)為同時(shí)代沉積特征,礦體的產(chǎn)出主要受原始沉積地層中有機(jī)碳的控制,地層中沉積的有機(jī)質(zhì)在后期區(qū)域變質(zhì)作用下形成石墨礦體,因此晶質(zhì)石墨礦床具有“層控”礦床的特征。區(qū)域上高的溫壓條件能夠使有機(jī)碳在變質(zhì)作用下完成碳的構(gòu)造有序化,促使有機(jī)碳結(jié)晶成鱗片狀石墨。黑龍江省三個(gè)礦床石墨碳同位素的分析測(cè)試數(shù)值都在-20.8‰到-17.8‰之間,主要集中分布-20‰左右。這個(gè)數(shù)值與現(xiàn)代動(dòng)、植物,現(xiàn)代有機(jī)質(zhì)、石油、煤、瀝青及非海生、海生有機(jī)物的δ~(13)C數(shù)值范圍(-10~-40‰之間)完全一致,而與灰?guī)r和大理巖中的~(13)C的范圍相差較大,從而表明黑龍江省石墨礦床的碳質(zhì)來(lái)源主要來(lái)自于有機(jī)碳。通過(guò)對(duì)省內(nèi)三個(gè)石墨礦床分布和成礦規(guī)律的對(duì)比研究,總結(jié)出石墨礦床的找礦標(biāo)志為巖性標(biāo)志和地層標(biāo)志,認(rèn)為未來(lái)黑龍江省石墨礦產(chǎn)的勘查部署的重點(diǎn)區(qū)域應(yīng)該是已知礦產(chǎn)地的外圍。
[Abstract]:Natural crystalline graphite mineral is one of the most important nonmetallic minerals in China, and is the necessary mineral material for traditional industry and strategic new industry. At present, graphite resources in China are in an awkward position: exporting graphite raw materials at low prices. The high price import graphite products, this kind of trade deficit causes the natural graphite resources in our country to be over-exploited and wasted. Heilongjiang Province is the province with the largest reserves of crystalline graphite, and the deposit type in the province is mainly regional metamorphism. The deposits are large in scale. At present, 54 graphite deposits have been discovered, including mineral sites, of which there are three super-large graphite deposits. Through the collection and mapping of the data of graphite deposits in the province, It is found that the graphite deposits in the province are mainly distributed in Jiamusi block, that is, Jixi-Shuangyashan-Luobei area. The regional metamorphic graphite deposits are of high quality with large scales. The Yunshan graphite deposit in Luobei is known as "the largest graphite deposit in Asia". The ore-bearing strata of crystalline graphite deposits in Heilongjiang Province are mainly pre-Cambrian old metamorphic rocks. The degree of regional metamorphism of ore-bearing strata generally reaches amphibolite facies and granulite facies. The occurrence of ore body and surrounding rock of graphite deposit are consistent with the characteristics of contemporaneous sedimentation, and the production of orebody is mainly controlled by organic carbon in the original sedimentary strata. The organic matter deposited in the strata formed graphite orebody under the late regional metamorphism, so the crystalline graphite deposit has the characteristics of "stratabound" deposit. The high temperature and pressure conditions in the region can make organic carbon complete the structural ordering of carbon under metamorphism. The analytical and testing values of graphite carbon isotopes of the three deposits in Heilongjiang Province ranged from -20.8 鈥，

本文編號(hào)：1631526