本文選題：侵入體 + 圍巖　； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：臨南洼陷位于惠民凹陷的西南部,受新生代斷陷的影響,區(qū)內(nèi)巖漿活動(dòng)劇烈,發(fā)育大量侵入體。本文以臨南洼陷夏38塊侵入體為研究對(duì)象,明確了侵入體的巖石學(xué)和地球化學(xué)化學(xué)特征,分析了侵入體對(duì)圍巖地層的影響及原因,闡明了圍巖受影響范圍。通過(guò)野外巖心觀察、薄片鏡下鑒定和巖石主微量元素分析等確定:夏38塊侵入體巖性以輝綠巖為主,也可見(jiàn)少量玄武巖;巖漿偏堿性,具有貧鉀富鈉的特征;微量元素分析顯示火成巖屬于板內(nèi)裂谷型玄武巖;稀土元素分析,巖漿源區(qū)熔融程度相對(duì)較高,巖漿來(lái)自較深的地幔源區(qū),且在形成過(guò)程沒(méi)有發(fā)生明顯分異;鍶釹同位素分析顯示,巖漿源區(qū)主要兩個(gè),一個(gè)為具DMM或似印度洋MORB特征的源區(qū),另一個(gè)為EM1,另外EM2也可能有一些貢獻(xiàn),但是較小。通過(guò)分析圍巖的有機(jī)碳含量、鏡質(zhì)體反射率等,確定侵入巖促進(jìn)圍巖有機(jī)質(zhì)生烴演化,使有機(jī)質(zhì)含量減少,成熟度增高。根據(jù)圍巖熱傳導(dǎo)規(guī)律建立了三種侵入巖熱作用模式,確定了侵入巖周圍溫度場(chǎng)的分布,和侵入體熱作用對(duì)圍巖的影響范圍。利用實(shí)測(cè)鏡質(zhì)體反射率數(shù)據(jù)恢復(fù)圍巖最高古地溫,對(duì)三種侵入巖熱作用模式進(jìn)行驗(yàn)證,表明夏38侵入體的熱傳導(dǎo)模式以簡(jiǎn)單熱傳導(dǎo)為主。通過(guò)野外巖心觀察、薄片鏡下鑒定、粘土礦物含量分析和同位素測(cè)定發(fā)現(xiàn):侵入巖造成圍巖粘土礦物轉(zhuǎn)化異常;促進(jìn)碳酸鹽膠結(jié)物生成;圍巖87Sr/86Sr明顯降低。高溫、流體物質(zhì)及幔源CO2共同作用下造成了圍巖粘土礦物轉(zhuǎn)化異常;巖漿水、變質(zhì)水、以及幔源CO2的共同影響了圍巖碳酸鹽膠結(jié)物的形成;侵入巖與圍巖接觸帶附近裂隙中的蝕變流體是導(dǎo)致圍巖87Sr/86Sr降低的主要原因。
[Abstract]:Linnan sag is located in the southwest of Huimin sag. Influenced by Cenozoic fault depression, magmatic activity is intense and a large number of intrusive bodies are developed in the area. Taking Xia-38 intrusions in Linnan sag as the research object, the petrological and geochemical chemical characteristics of intrusions are clarified, the influence of intrusions on surrounding rock strata and its causes are analyzed, and the affected range of surrounding rocks is clarified. Through field core observation, microscopical identification and analysis of main trace elements of rock, it is confirmed that the lithology of Xia-38 intrusive body is mainly diabase, and a small amount of basalt can also be seen, the magma is alkalescent and has the characteristics of poor potassium and sodium rich, and so on. Trace element analysis shows that igneous rocks belong to intraplate rift type basalt, REE analysis shows that the melting degree of magma source region is relatively high, magma comes from deeper mantle source region, and there is no obvious difference in the formation process. Strontium-neodymium isotopic analysis shows that there are two major magmatic sources, one with DMM or Indian Ocean MORB characteristics, the other with EM1, and EM2 may make some contributions, but it is small. By analyzing the organic carbon content and vitrinite reflectance of surrounding rock, it is determined that the intrusive rock promotes the hydrocarbon generation evolution of surrounding rock organic matter, reduces the organic matter content and increases the maturity. According to the heat conduction law of surrounding rock, three thermal models of intrusive rock are established, and the distribution of temperature field around intrusive rock and the influence range of intrusive body heat on surrounding rock are determined. By using the measured vitrinite reflectance data to recover the highest paleo-geothermal temperature of surrounding rock, three thermal models of intrusive rock are verified, which indicates that the heat conduction mode of Xia-38 intrusive body is mainly simple heat conduction. Through field core observation, thin slice microscopic identification, clay mineral content analysis and isotopic determination, it is found that intrusive rocks cause abnormal transformation of clay minerals in surrounding rock, promote formation of carbonate cement, and decrease 87Sr/86Sr of surrounding rock obviously. Under the action of high temperature, fluid material and mantle-derived CO2, the transformation anomaly of surrounding rock clay minerals is caused, and the formation of carbonate cementation in surrounding rock is influenced by magmatic water, metamorphic water and mantle-derived CO2. The alteration fluid in the fissure near the contact zone between intrusive rock and surrounding rock is the main reason for the decrease of 87Sr/86Sr in surrounding rock.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P584

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本文編號(hào)：1835719