Thermal conductivity and radioactive heat-producing element content determinations for rocks from Zhangzhou region, SE China, and their constraints on lithospheric thermal regime

Thermal conductivity and radioactive heat-producing element content determinations for rocks from Zhangzhou region, SE China, and their constraints on lithospheric thermal regime
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漳州地区岩石热导率和放射性发热元素含量测定及其对岩石圈热状态的约束

DOI:
10.1007/s12665-016-6020-8
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发表时间:
2016-08
影响因子:
2.8
通讯作者:
Lizhong Yang
Lizhong Yang
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Jinhui Liu;Jianjun Wan;Baoqun Hu;Lizhong Yang

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测定了漳州地区地表岩石和钻孔岩石的放射性生热元素含量、岩石导热系数和岩石密度。结果表明,花岗岩的平均放射生热率为3.70亿μW/m~3,明显高于同地区的中酸性火山岩、镁铁质岩脉和沉积岩。此外,主要产热率来自U和Th的衰变热,40K的热贡献率小于10%。岩石的平均热导率为2.83W/mK,接近中上地壳岩石的热导率。我们的新资料结合前人的地质、地球物理和地热资料表明,地幔比地壳对地表热流的贡献更大,即Qm/Qc;
Radioactive heat-producing element content and rock thermal conductivity together with rock density have been determined for rocks from surface and drilling holes within Zhangzhou region, SE China. The results suggest that the average radiogenic heat production rate of granites is 3.70 μW/m3, markedly higher than that of middle-acid volcanic rocks, mafic dykes and sedimentary rocks from the same region. Additionally, the main heat production rate is sourced from the decay heat of U and Th with40K thermal contribution being less than 10 %. The average rock thermal conductivity is 2.83 W/mK, approaching that of the middle-upper crustal rocks. Our new data, in combination with previous geology, geophysics and geothermics data, indicate that mantle contributes more heat flow than crust to the surface heat flow, i.e., Qm/Qc > 1, and that Zhangzhou region has a relatively thinner crustal thickness.
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