本文選題：氫氧穩(wěn)定同位素　切入點(diǎn)：地下熱水　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】：云南省西北部是地?zé)豳Y源比較豐富的地區(qū),研究該地區(qū)溫泉的形成具有重要的理論和實(shí)際意義。在地下熱水的同位素研究方面,利用放射性同位素測(cè)定地下水年齡和判斷熱儲(chǔ)溫度及冷熱水混合等問題前人開展了一些研究,而對(duì)于云南省西北部溫泉δ2H和δ18O穩(wěn)定同位素的研究較為缺乏。自2013-2015年在西藏芒康縣到云南保山市陸續(xù)采集了65個(gè)水樣。其中包括溫泉水、鹽泉水、咸溫泉水及鹽井水,以溫泉水為主。本文依據(jù)已有δ2H和δ18O測(cè)試水樣對(duì)云南西北部溫泉的δ2H和δ18O時(shí)空變化及其影響因素進(jìn)行分析。結(jié)果表明,水樣點(diǎn)的δ2H,δ18O值從南向北有逐漸偏負(fù)的趨勢(shì)。從全球大氣降水與δ2H、δ18O關(guān)系得出,研究區(qū)水樣來源于當(dāng)?shù)卮髿饨邓�。所以影響大氣降水中�?H、δ18O值的因素必然也是影響地下熱水中δ2H、δ18O值的因素。研究區(qū)緯度跨度不超過5°,可以看到δ2H、δ18O值呈現(xiàn)出越來越負(fù)的變化范圍,δ2H、δ18O值分別從63號(hào)水樣北緯24.65o保山龍陵(YL1)的-68‰和-9.9‰,降至1號(hào)水樣北緯29.08o西藏曲孜卡(XZQZK)的-145.5‰和-16.7‰。變化幅度已經(jīng)非常大。δ2H值相對(duì)于δ18O值變化更明顯;從中國(guó)大氣降水中δ2H、δ18O值的全國(guó)等值線圖和研究區(qū)內(nèi)地下熱水的δ2H、δ18O值的等值線圖可以看出,從我國(guó)東南方向的海岸區(qū)向西北方向的大陸內(nèi)部,呈現(xiàn)出δ2H、δ18O值呈現(xiàn)越來越負(fù)的趨勢(shì);從我國(guó)國(guó)內(nèi)降雨的特征來看,研究區(qū)處于我國(guó)西南地區(qū)大氣降水中δ2H、δ18O值呈負(fù)值也是不容置疑;研究區(qū)地形起伏較大且無規(guī)律可言,從研究區(qū)溫泉中δ2H、δ18O值與溫泉采樣點(diǎn)的高程對(duì)比圖可以看出采樣點(diǎn)高程為3443m的下給溫泉δ2H和δ18O值分別為-130.3‰和-16.2‰,而樣點(diǎn)高程為1267m的邦臘掌溫泉δ2H和δ18O值分別為-68‰和-9.9‰,呈明顯的負(fù)相關(guān)關(guān)系。利用高程效應(yīng)計(jì)算各個(gè)溫泉的補(bǔ)給高程,并且研究區(qū)溫泉中δ2H、δ18O值與溫泉采樣點(diǎn)的補(bǔ)給高程仍然呈明顯的負(fù)相關(guān)關(guān)系;由于研究區(qū)夏季受到西南季風(fēng)的影響,使得夏季雖然高溫但是降雨量很大,地下熱水中的δ2H、δ18O值一般也會(huì)比冬天偏負(fù)。
[Abstract]:Northwest Yunnan Province is rich in geothermal resources. It is of great theoretical and practical significance to study the formation of hot springs in this area. Some previous studies have been carried out on the determination of groundwater age and the determination of heat storage temperature and mixing of cold and hot water with radioisotope. However, the study of 未 2H and 未 18O stable isotopes in hot springs in northwestern Yunnan Province is relatively scarce. From Mengkang County, Tibet, to Baoshan City, Yunnan Province, 65 water samples were collected from 2013-2015, including hot spring water, salt spring water, salty hot spring water and salt well water. In this paper, the temporal and spatial variations of 未 2H and 未 18O in hot springs in northwest Yunnan and their influencing factors are analyzed according to the existing 未 2H and 未 18O test water samples. The 未 _ 2H, 未 _ 18O values of water samples tend to be negative from south to north, and the relationship between global precipitation and 未 _ 2H, 未 _ (18) O is obtained. The water samples in the study area come from the local atmospheric precipitation. Therefore, the factors influencing 未 2H and 未 18O values in the precipitation must also be the factors affecting the 未 2H and 未 18O values in the geothermal water. The latitude span of the studied area is less than 5 擄, and it can be seen that 未 2H and 未 18O values are becoming more and more negative. The values of 未 _ 2H and 未 _ 18O are from -68 鈥，

本文編號(hào)：1643345