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引言有关火成岩地热体系中估计热能的主要根据是浅部硅质岩浆房存在的证据及岩浆房的体积,以及从岩浆房中最后喷发的年代(Smith 和 Shaw,1978)。根据这个前提,评价与年青火成岩有关的地热体系的一个简单的基本原理表示在图1中(1978等)。关于火成岩地热体系冷却的有关情况,我们研究了犹他州南中央地区双峰硅质火山体系。虽认为该火山体系已息灭(图1),因岩浆最终冷却(岩浆寿命)前的活动时间就相当冷却时间,所以该体系有特别意义。根据对该体系的重力测量来估计其体积并结合一些新资料,我
INTRODUCTION The main basis for the estimation of thermal energy in igneous geothermal systems is the evidence of the presence of shallow siliceous magmatisms and the volume of magmatic chambers, as well as the age of last eruption from the magma chamber (Smith and Shaw 1978). Based on this premise, a simple rationale for evaluating geothermal systems associated with young igneous rocks is shown in Figure 1 (1978 et al.). Regarding the cooling of igneous geothermal systems, we have studied the bimodal siliceous volcanic system in the southern central Utah region. Although this volcano system is considered to be extinct (Fig. 1), this system is of special significance because the active time prior to the eventual cooling of the magma (magmatic life) is equivalent to the cooling down time. Based on the gravimetric measurements of the system to estimate its volume combined with some new information, I