| 陕北盐盆马家沟组五段六亚段沉积期的古气候信息--来自石盐包裹体的证据 |
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| 引用本文： | 胡彬,孔凡晶,张永生,郑绵平,陈靖.陕北盐盆马家沟组五段六亚段沉积期的古气候信息--来自石盐包裹体的证据[J].沉积学报,2014,32(3):510-517. |
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| 作者姓名： | 胡彬 孔凡晶 张永生 郑绵平 陈靖 |
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| 作者单位： | 中国地质科学院矿产资源研究所;国土资源部盐湖资源与环境重点实验室; |
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| 基金项目： | 973项目(编号:2011CB403001);地调项目(编号:1212011120178);公益性行业科研专项(编号:201011001-4)联合资助 |
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| 摘 要： | 石盐包裹体的均一温度能够代表卤水结晶的温度，因而是揭示古气候的有效手段。陕北盐盆位于鄂尔多斯盆地中东部，区内奥陶纪马家沟组发育厚层含盐沉积。对采自该盐盆的镇钾1井中的石盐包裹体进行详细的岩相学研究以及均一温度测定。岩相学研究结果表明，包裹体的形态主要为方形、圆形及不规则形，包裹体的类型主要为纯液相、气液两相和含子矿物包裹体三种。包裹体均一温度的测定采用低温冷冻测温法，其中，深度2 738 m的样品zjy-1，均一温度为18.5℃~27℃；深度2 740 m的样品zjy-2，均一温度为14.9℃~29.9℃；深度2 744 m的样品zjy-3，均一温度为24℃~36.9℃；深度2 812.8 m的样品zjy-4，均一温度为14.7℃~31℃；该温度与前人所研究的奥陶纪古温度基本吻合。样品均一温度反映陕北盐盆马家沟组五段六亚段沉积期的古气温在27℃~36.9℃之间，其古气候为地处南半球低纬度干旱气候带，炎热干旱的气候特征。
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| 关 键 词： | 石盐流体包裹体 均一温度 冷冻法测温 陕北奥陶纪岩盐 古气候 |
| 收稿时间： | 2013-07-31 |
Paleoclimatic Information of O2m65 Deposition Stage in Northern Shaanxi Salt Basin: Evidence from fluid inclusion in halite |
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| Abstract: | The homogenization temperature of fluid inclusions reflects the temperatures of the brines from which halite crystals grew. Therefore, it is a powerful tool to reveal the paleoclimate. Northern Shaanxi Salt Basin is located in the central and eastern of Ordos Basin. There is thick-bedded salt in Ordovician Majiagou Formation. Petrographical research and the homogenization temperature measurement of the samples which come from Zhenjia-1 core have been studied in detail. The results of petrographic research show that there are three types of fluid inclusions which are square, round and irregular. They contain liquid inclusion, liquid-gas inclusion and liquid-gas -crystal inclusion. The homogenization temperatures of fluid inclusions have been measured by cooling nucleation method. It shows that the homogenization temperatures of fluid inclusions of sample zjy-1(2 738 m deep) range 18.5℃ to 27℃, sample zjy-2(2 740 m deep) range 14.9℃ to 29.9℃, sample zjy-3(2 744 m deep) range 24℃ to 39.6℃, and sample zjy-4(2 812.8 m deep) range 14.7℃ to 31℃. Comparing with previous paleotemperature, the records are basically coincident. The homogenization temperatures reflect the paleotemperature of Northern Shaanxi Salt Basin in the O2m65 stage of Ordovician period is about 27℃~36.9℃, the paleoclimate is arid and hot in low-latitude arid zone of the southern hemisphere. |
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