The combined use of the stable isotope compositions of speleothem carbonate and inclusion-hosted water presents great potential in paleotemperature reconstructions, due to the various temperature-dependent isotope fractionations detected in cave systems and their environment. This paper evaluates the applicational possibilities of hydrogen and oxygen isotope measurements of inclusion-hosted water and its host calcite, in three different approaches: i) direct determination of calcite-water oxygen isotope fractionation by measuring inclusion water and carbonate compositions, ii) calculation of water oxygen isotope composition from hydrogen isotope data and of temperature from the inferred calcite-water fractionation, and iii) calculation of formation temperature from measured hydrogen isotope data and its temperature dependence in the modern precipitation water. Fluid inclusion oxygen and hydrogen isotope compositions as well as calcite oxygen isotope compositions were determined for five speleothem occurrences in Hungary. Although the background processes are not resolved, calculations involving measured calcite and water oxygen isotope compositions yielded unrealistic paleotemperatures, likely because of syn-formation isotope fractionation processes and diagenetic alterations. The hydrogen isotope data may yield realistic temperatures, provided that long-term isotopic composition - temperature relationships are known and the stable hydrogen isotope composition of the precipitation waters in the study area is temperature-controlled. Winter half-year and annual isotope-temperature relationships (δ²H/T gradients) were calculated using multidecadal isotope composition records from the Global Network of Isotopes in Precipitation (GNIP), gridded surface temperatures, and precipitation amounts from the E-OBS 21.0e database. The calculations yielded a paleotemperature record for the last ~250 ka, with average precisions ranging from ±0.6 °C for interglacial to ±2.4 °C for glacial periods. Clumped isotope analyses of cave-hosted flowstones support the inferred formation temperatures based on gradients, while detection of kinetic fractionations by combined hydrogen and oxygen isotope analyses of calcite and inclusion water lead to filtering clumped isotope (Δ₄₇) data and more coherent Δ₄₇-temperature relationships.

由于在洞穴系统及其周围环境中检测到各种与温度有关的同位素分馏，碳酸类硒代碳酸盐和夹杂物包埋的水的稳定同位素组成的组合使用在古温度重建中具有巨大潜力。本文以三种不同的方法评估了夹杂物包容水及其主体方解石的氢和氧同位素测量的应用可能性：i）通过测量夹杂物水和碳酸盐成分直接测定方解石-水氧同位素分馏； ii）计算根据氢同位素数据得出的水氧同位素组成以及根据方解石-水分馏推断出的温度 iii）根据测得的氢同位素数据及其在现代降水水中的温度依赖性来计算地层温度。确定了匈牙利发生的5次蛇麻草中流体包裹体的氧和氢同位素组成以及方解石氧同位素组成。尽管没有解决背景过程，但涉及方解石和水氧同位素组成的计算得出了不切实际的古温度，可能是由于同构同位素分馏过程和成岩作用。只要已知长期同位素组成与温度的关系并且研究区域内沉淀水的稳定氢同位素组成受到温度控制，氢同位素数据就可以得出实际温度。冬半年度和年度同位素-温度关系（δ ² H / T梯度）使用从同位素的降水全球网络（GNIP）multidecadal同位素组合物的记录，网格表面温度，并且沉淀量从计算出的ë-OBS 21.0e数据库。通过计算得出了最后一个〜250 ka的古温度记录，平均精度介于冰间期的±0.6°C到冰期的±2.4°C之间。洞穴托管流石支持基于梯度推断地层温度的成群同位素分析，同时通过结合氢，氧同位素动力学分馏的检测的方解石和包容水铅分析，以过滤结块同位素（Δ ₄₇）的数据和更加一致的Δ ₄₇ -温度关系。