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首页> 外文期刊>Scientific reports. >Paleoclimatic information recorded in fluid inclusions in halites from Lop Nur, Western China
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Paleoclimatic information recorded in fluid inclusions in halites from Lop Nur, Western China

机译：中国西部罗布泊的卤化物中的流体包裹体中记录的古气候信息

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The homogenization temperature (Th) of primary fluid inclusions in halite can be used for paleoclimate interpretations. Lop Nur, in Central Asia, is an extremely arid zone where large amounts of glauberite were deposited from the late Middle to Late Pleistocene. This deposition was accompanied by formation of large-scale potash-bearing brines. However, quantitative paleotemperature data are still lacking, hindering reconstruction of Quaternary climate conditions and their control over potash formation. We measured the Th of inclusions in halite from the salt field and the top of Upper Pleistocene strata in Lop Nur. The maximum homogenization temperature (Th MAX) of inclusions in halite from the salt field was 41.1?°C, consistent with the maximum ambient temperature (43.4?°C) in the same period. The Th MAX of inclusions in halite from the Upper Pleistocene strata ranged from 35.6?°C to 43?°C, where maximum air temperatures may have reached 37.9?°C to 45.3?°C. The results show that a hot and arid climate prevailed in Lop Nur at the end of the Late Pleistocene. Furthermore, changes of the brine chemical composition due to supply variations instead of climate change, may have caused glauberite deposition to cease at the end of the Late Pleistocene.
机译：盐岩中主要流体包裹体的均质温度（Th）可用于古气候解释。中亚的罗布泊（Lop Nur）是一个极为干旱的地区，从中晚期到晚更新世沉积了大量的钙芒硝。这种沉积伴随着大规模的含钾盐水的形成。但是，仍然缺乏定量的古温度数据，阻碍了第四纪气候条件的重建及其对钾盐形成的控制。我们测量了罗布泊盐田和上更新世地层顶部盐岩中的夹杂物Th。盐田岩盐岩中夹杂物的最高均质温度（Th MAX）为41.1？C，与同期最高环境温度（43.4？C）一致。上更新世地层的岩盐中的夹杂物的Th MAX范围为35.6°C至43°C，最高空气温度可能达到37.9°C至45.3°C。结果表明，晚更新世末期的罗布泊盛行炎热而干旱的气候。此外，由于供应变化而不是气候变化引起的盐水化学成分变化，可能导致钙镁矿的沉积在晚更新世末期停止。

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