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磷灰石(U-Th)/He热定年技术是目前国际上研究低温状态下构造-热演化最先进的方法之一,而其中的磷灰石He封闭温度是该技术的一个重要参数;但目前被广泛应用的磷灰石He封闭温度模式是通过热模拟样品建立的.本文通过塔里木盆地钻井样品的磷灰石He年龄测试,探讨了自然演化系列的磷灰石He封闭温度并建立了磷灰石He年龄与深度的演化模式.研究表明,塔里木盆地自然样品的磷灰石He封闭温度为88±5℃,高于国外广泛应用的由热模拟实验得到的结果(～75℃±).综合分析认为,造成磷灰石He封闭温度偏高的因素主要是过高的有效铀浓度(eU),长期的辐射损伤积累和足够大的颗粒半径.塔里木盆地自然样品磷灰石He封闭温度的确立,修正了国际上广泛应用的磷灰石He封闭温度演化模式,从而更好地运用该方法研究盆-山演化晚期的构造事件,精确地揭示其隆升时间及隆升速率.
Apatite (U-Th) / He thermosetting technique is one of the most advanced methods for studying the tectono-thermal evolution at low temperature in the world, and the He occluded temperature of apatite is an important parameter of this technique. However, At present, the most widely used apatite He sealing temperature model is established by thermal simulation of samples.Through apatite He age test of drilling samples in the Tarim Basin, we discussed the closed temperature of apatite He in the natural evolution series and established the phosphorus The study shows that the apatite He sealing temperature of the natural samples in the Tarim Basin is 88 ± 5 ℃, which is higher than that of abroad (~ 75 ℃ ±), which is widely used in thermal simulation experiments. The comprehensive analysis indicates that the factors that cause the high He sealing temperature of apatite are mainly high effective uranium concentration (eU), long-term radiation damage accumulation and large enough particle radius.Among the natural samples in the Tarim Basin, the He-closure temperature This paper established and corrected the international closed-loop temperature evolution model of apatite He, so as to make better use of this method to study the tectonic events in the late basin-mountain evolution and accurately reveal the uplift time and uplift rate.