Halite deposits have long been utilized for interrogating past climate conditions. Microthermometry on halite fluid inclusions has been used to determine ancient water temperatures. One notable obstacle in performing microthermometric measurements, however, is the lack of a vapor bubble in the single-phase liquid inclusions at room temperature. (Pseudo-) isochoric cooling of the inclusions to high negative pressures, far below the homogenization temperature, has commonly been needed to provoke spontaneous vapor bubble nucleation in the liquid. High internal tensile stress in soft host minerals like halite, however, may induce plastic deformation of the inclusion walls, resulting in a wide scatter of measured homogenization temperatures. Nucleation-assisted (NA) microthermometry, in contrast, employs single ultra-short laser pulses provided by a femtosecond laser to stimulate vapor bubble nucleation in metastable liquid inclusions slightly below the expected homogenization temperature. This technique allows for repeated vapor bubble nucleation in selected fluid inclusions without affecting the volumetric properties of the inclusions, and yields highly precise and accurate homogenization temperatures.

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成核辅助显微测温：岩盐流体包裹体的新应用


岩盐矿床长期以来一直被用来研究过去的气候条件。岩盐流体包裹体的显微测温已被用来确定古代水温。然而，进行显微测温测量的一个显着障碍是室温下单相液体包裹体中缺乏蒸气泡。通常需要将夹杂物（伪）等容冷却至远低于均质化温度的高负压，以激发液体中自发的蒸汽泡成核。然而，石盐等软基质矿物中的高内部拉伸应力可能会引起包裹体壁的塑性变形，导致测量的均质化温度出现广泛的分散。相比之下，成核辅助 (NA) 显微测温法采用飞秒激光器提供的单个超短激光脉冲，在略低于预期均质化温度的情况下刺激亚稳态液体夹杂物中的蒸气泡成核。该技术允许在选定的流体包裹体中重复蒸汽泡成核，而不影响包裹体的体积特性，并产生高度精确和准确的均化温度。