本文選題：南海　切入點：巖心　出處：《大地構(gòu)造與成礦學(xué)》2017年06期

【摘要】：放射性生熱率是巖石熱物性參數(shù)之一,也是研究巖石圈熱結(jié)構(gòu)和構(gòu)造熱演化的重要參數(shù)。針對南海海盆區(qū)缺少巖石生熱率資料的實際情況,本文通過整理和分析IODP349航次中的測井資料,測試鉆井巖心樣品的主要放射性生熱元素,通過計算得出:玄武巖樣品的生熱率平均值為0.28±0.07μW/m~3,沉積碎屑巖樣品的生熱率為1.21±0.34μW/m~3,以及3個鉆井的地?zé)崃髦�。獲得以下認識:(1)本次研究的沉積碎屑巖樣品生熱率與中國東南沿海的同類巖石樣品的生熱率值相近,而洋殼中的基性火山巖生熱率明顯低于大陸堿性玄武巖。(2)用新資料計算南海西南次海盆段的巖石圈熱結(jié)構(gòu)得出其熱巖石圈厚度約為39~42 km,平均殼幔熱流比值為2.4%,說明西南次海盆巖石圈薄,海底熱流主要受深部的地幔熱源控制。(3)U1431D和U1433A鉆井的熱流密度值與附近探針熱流密度值相近;而U1431C的熱流密度值明顯偏小,屬于受地下水熱循環(huán)影響所致。
[Abstract]:Radioactive heat generation rate is one of the thermal physical parameters of rock, and is also an important parameter to study the thermal structure of lithosphere and tectonic thermal evolution. In this paper, by sorting out and analyzing the logging data of IODP349 voyage, the main radiogenic heat elements of drilling core samples are tested. The average heat generation rate of basalt sample is 0.28 鹵0.07 渭 W / mm3, the heat generation rate of sedimentary clastic rock sample is 1.21 鹵0.34 渭 W / mm3, and the geothermal flow value of three drilling wells is obtained. The calorific rate values of the similar rock samples in the southeastern coast of China are similar. The calorific rate of basic volcanic rocks in oceanic crust is obviously lower than that of continental alkaline basalt. (2) using new data to calculate the lithospheric thermal structure of the southwest subbasin of the South China Sea, the thickness of the thermal lithosphere is about 394km and the average ratio of crust-mantle heat flow is 2.4 cm. The subbasin lithosphere in the southwest of the Ming Dynasty was thin, The undersea heat flux is mainly controlled by the deep mantle heat source. The heat flux density of U1431D and U1433A drilling is similar to that of the nearby probe, while the heat flux of U1431C is obviously smaller, which is caused by the influence of groundwater thermal cycle.
【作者單位】： 國土資源部海底礦產(chǎn)資源重點實驗室廣州海洋地質(zhì)調(diào)查局;中國科學(xué)院大學(xué);核工業(yè)二九0研究所;
【基金】：國家自然科學(xué)基金(91428205) 國家863計劃海洋技術(shù)領(lǐng)域科研項目(2006AA09A203)聯(lián)合資助
【分類號】：P714.6;P736

【相似文獻】

相關(guān)期刊論文 前1條

1 ;南海第二次大洋鉆探——IODP349航次[J];海洋地質(zhì)與第四紀地質(zhì);2014年02期

，

本文編號：1677269