摘要
安徽省位于中国东南部,岩浆活动频繁,燕山期岩浆活动最为发育,岩浆岩出露面积超过13000 km^(2),不同类型、不同成因的岩石均有发育,并以大别山、长江中下游和皖南地区较为集中。本研究在安徽省不同岩浆岩带共采集159块样品开展岩石密度和放射性生热元素含量测试,结合前人对安徽省岩浆岩放射性生热元素的测试结果,首次对安徽省岩浆岩开展了系统的放射性生热元素统计研究。结果表明:安徽省岩浆岩总体上U、Th、K平均含量相差较大,花岗质岩石及中酸性火山岩的U、Th、K含量较高,基性岩浆岩的U、Th、K含量较低;不同类型的岩浆岩放射性生热率相差较大,花岗质岩石和中酸性火山岩生热率相对较高且变化范围较宽,基性岩浆岩生热率较低且变化范围较窄;金寨和长江中下游地区部分花岗岩生热率超过5μW/m^(3),为高产热花岗岩;岩浆岩的热贡献主要来自于U和Th的放射性衰变热,K的衰变热贡献相对较低,一般不超过10%。通过本文研究,结合前人对安徽省地质地热等方面的研究成果,发现岩浆岩放射性生热对安徽省温泉分布、干热岩勘探和U矿床勘探等具有重要的意义,可为安徽省后续地热资源勘查开发研究提供支撑。
Anhui Province is located in the southeastern China, where magmatism is frequent, and the Yanshanian magmatism is the most developed. The exposed area of magmatic rocks is more than 13 000 km^(2), and rocks of different types and origins are all developed, and they are concentrated in the Dabie Mountains, the middle and lower reaches of the Yangtze River, and southern Anhui. In this study, we collected 159 samples from different magmatic rock belts in Anhui Province and carried out rock density and radioactive heat-generating element content determinations. Combined with the previous test results of radioactive heat-generating elements of magmatic rocks in Anhui Province, we have carried out a systematic study on radioactive heat-generating elements of magmatic rocks in Anhui Province for the first time. The results suggest that the average contents of U, Th, and K of magmatic rocks in Anhui Province is quite different. Granitic rocks and intermediate-acid volcanic rocks have higher U, Th, and K contents, and basic magmatic rocks have relatively lower U, Th, and K contents. The radioactive heat generation rate of different types of magmatic rocks is quite different. The heat generation rates of granitic rocks and intermediate-acid volcanic rocks are relatively higher and the variation range is wide, while basic magmatic rocks are relatively lower and the variation range is narrow. The heat generation rates of some granites in Jinzhai and the middle and lower reaches of the Yangtze River exceed 5 μW/m^(3), which are high heat production granites. The main thermal contribution of magmatic rocks comes from the radioactive decay heat of U and Th, while that of K is relatively lower, generally no more than 10%. Through this study, combined with previous research results on geology and geothermal in Anhui Province, it is found that the radioactive heat generation of magmatic rocks is of great significance to the distribution of hot springs, dry hot rock exploration and U deposits exploration in Anhui Province,which can provide further support for the subsequent exploration and development of geothermal resources in Anhui Province.
作者
豆保娜
王安东
丁宁
陶继华
万建军
DOU Bao-na;WANG An-dong;DING Ning;TAO Ji-hua;WAN Jian-jun(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;School of Earth Sciences,East China University of Technology,Nanchang 330013,China;Geological Survey of Anhui Province,Hefei 230001,China)
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2022年第3期609-627,共19页
Acta Petrologica et Mineralogica
基金
国家重点研发计划项目(2018YFA0404104)
核资源与环境国家重点实验室自主基金(Z1912)
中国地质调查局地质调查项目(DD20190128)
国家自然科学基金项目(41874100)。
关键词
放射性生热率
热贡献
岩浆岩体
地热
安徽省
radioactive heat generation rates
thermal contribution
magmatic rocks
geothermal
Anhui Province
