Abstract Differences in the geothermal regime of continental intraplate regions depend mainly on the amount and distribution of radioactive heat production in crustal rocks. Granitoids are the predominant sources of radioactive heat production and have abundant radioactive heat-producing elements, such as uranium, thorium and potassium. The Mesozoic geology of the South China Block (SCB) is characterized by long-term continental reconstruction, widespread granitoids and super-large ore deposits such as U, W, Mo and Sn deposits and is a typical “hot” continent and so-called Mesozoic large granitic province. Unfortunately, so far, research on the geotherm in the SCB is largely concentrated in geophysics and hydrology, with rare studies on the correlation between the geotherm and granitoids. The peak radioactive heat production rates (RHPRs) are consistent with the Mesozoic magmatic pulse. Notably, the varieties of radioactive heat production from the granitoids are not attributed to the differences in the basement rocks. In contrast to previous studies, this study found that not only A-type granitoids but also I-type and S-type granitoids are high-heat-producing (HHP) granitoids. The RHPRs, heat reservoirs and various batholith sizes in the SCB indicate that the large batholiths generally show high RHPRs and heat reservoirs. The distribution of hot springs is closely linked to the radioactive heat production and size of the intrusions. Additionally, we exclude another possibility of an efficient magma chamber with abundant remnant heat beneath the SCB. On the basis of the calculation and analysis of the amount of granitic radioactive heat production, we suggest that the Mesozoic HHP granitoids and high-temperature geothermal reservoir granitoids are the most significant heat source of the crustal geotherm in the SCB.

中文翻译：

---

晚中生代高热（HHP）和高温地热储层花岗岩：华南最重要的地热机制

摘要 大陆板内地区地热状况的差异主要取决于地壳岩石放射性产热的数量和分布。花岗岩是放射性产热的主要来源，并含有丰富的放射性产热元素，如铀、钍和钾。华南地块（SCB）中生代地质以大陆长期重建、花岗岩广泛分布、U、W、Mo、Sn等超大型矿床为特征，是典型的“热”大陆，被称为“热”大陆。中生代花岗岩大省。遗憾的是，迄今为止，对南海盆地地热的研究主要集中在地球物理和水文学方面，对地热与花岗岩的相关性研究很少。峰值放射性产热率（RHPRs）与中生代岩浆脉冲一致。值得注意的是，花岗岩类产生的放射性热的多样性并不是由于基岩的差异造成的。与以往的研究相比，本研究发现，不仅 A 型花岗岩，而且 I 型和 S 型花岗岩都是高产热（HHP）花岗岩。SCB 中的 RHPR、热库和各种基岩尺寸表明，大型基岩通常表现出较高的 RHPR 和热库。温泉的分布与放射性热的产生和侵入体的大小密切相关。此外，我们排除了在 SCB 下方存在大量余热的高效岩浆房的另一种可能性。