One of the most important processes of heat generation from the Earth's interior is the radioactive decay of isotopes. The main hosts of the major radiogenic elements U, Th and K in the crust are granitoids. The Sierras de Córdoba are formed of dissimilar granitic intrusions emplaced by a series of magmatic events that occurred during the Paleozoic. The different granitoids are classified as A-type, I-type, and S-type, and there is also a magmatic expression corresponding to the Famatinian period which exhibits TTG-type characteristics. In this work, the geochemical concentrations of the radiogenic elements of the granitic intrusions making up the Sierras de Córdoba were compiled in a single database. The radiogenic heat production of the Sierras de Córdoba granitoids was evaluated, making this the first study of radiogenic heat generation in the area. The radiogenic heat production showed variability for the different events, with the highest values found in Achalian magmatism and early Carboniferous magmatism, which are represented by A-type granitoids. The Capilla del Monte pluton has the highest heat production rate, with a value of 4.54 ± 1.38 µW/m3. The lowest values were found in the TTG-type granitoids and in the S-type granitoids, all of which belong to the Famatinian magmatic event. The range of values for this magmatic event goes from 0.26 ± 0.05 µW/m3 for the San Agustin pluton to 1.19 ± 0.50 µW/m3 for the La Playa pluton. An empirical ternary model is presented for the Sierras de Córdoba that involves the concentrations of the elements U, Th and K, and the radiogenic heat production, with a distinction for the petrogenetic types according to the S-I-A-M classification. The thermal manifestations located on the Capilla del Monte pluton could be related to the radioactive heat generation of the intrusion, involving both the neotectonic activity of the area and the radiogenic heat production. The results provide new opportunities for studying temperature variation within some of these intrusions and to evaluate the geothermal potential of the granitoids of Córdoba.

中文翻译：

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阿根廷科尔多瓦山脉花岗岩中的放射性热产生

地球内部最重要的发热过程之一是同位素的放射性衰变。地壳中主要放射成因元素 U、Th 和 K 的主要寄主是花岗岩。Sierras de Córdoba 由不同的花岗岩侵入体形成，这些侵入体被古生代期间发生的一系列岩浆事件所包围。不同的花岗岩类分为A型、I型和S型，也有与法马提阶相对应的岩浆表现，表现出TTG型特征。在这项工作中，构成 Sierras de Córdoba 的花岗岩侵入体的放射成因元素的地球化学浓度被编译到一个数据库中。评估了 Sierras de Córdoba 花岗岩的放射热产生，使其成为该地区放射热产生的第一项研究。不同事件的放射热产生表现出变异性，在 Achalian 岩浆作用和早石炭纪岩浆作用中发现的值最高，以 A 型花岗岩为代表。Capilla del Monte 岩体的产热率最高，值为 4.54 ± 1.38 µW/m3。最低值出现在 TTG 型花岗岩和 S 型花岗岩中，均属于法马提阶岩浆事件。此岩浆事件的值范围从圣奥古斯丁岩体的 0.26 ± 0.05 µW/m3 到 La Playa 岩体的 1.19 ± 0.50 µW/m3。为塞拉斯科尔多瓦提供了一个经验三元模型，其中涉及元素 U、Th 和 K 的浓度以及放射热产生，根据 SIAM 分类对岩石成因类型进行区分。位于 Capilla del Monte 岩体上的热表现可能与侵入体产生的放射性热有关，涉及该地区的新构造活动和放射性热的产生。这些结果为研究其中一些侵入体的温度变化和评估科尔多瓦花岗岩的地热潜力提供了新的机会。