Abstract
The Panzhihua‐Xichang (Panxi) area of southwestern China (approximately 26°00′N to 28°48′N and 101°00′E to 103°00′E) is a paleorift zone of Hercynian age. The last major tectono‐thermal event occurred 200 to 250 Ma ago with extensive basaltic eruptions. Regional surface heat flow values vary from 40 to 90 mW/m² with the average of 63±15 mW/m². The U, Th contents increase with the acidity of igneous rocks. The highest contents (U 9.57 ppm, Th 27.67 ppm) are observed in biotite granite. The U, Th contents are well correlated with each other and the correlation coefficient is 0.9646, indicating the poor migration of U in epimagmatic state. On the basis of heat flow and heat production data, a linear relationship was obtained for the region.
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