投稿时间：2016-05-15
修订日期：2016-10-19
网络发布日期：2017-01-04
中文摘要:近年来江陵凹陷因深层富钾卤水及钾盐矿物的发现受到各界的关注。而钾盐的形成与古环境有着密切的联系。本文通过石盐包裹体均一温度的研究，对江陵凹陷早始新世古气候进行了初步探讨，力求为确定江陵凹陷成钾有利期提供一定依据。通过对石盐样品中的单一液相流体包裹体采用冷冻法进行均一温度测定，测温结果显示其均一温度范围是14.9~32.3℃，均值23.7℃，且各样品间温度数据波动不大。由此说明，江陵凹陷早始新世新沟嘴组中段的古气温较高，且比较稳定，属于温暖干旱的气候。此外，还通过分析比对前人研究成果，发现该区域古气温自沙市组至新沟嘴组下段有明显降低的趋势，这可能与古新世—始新世极热事件（PETM）之后的降温期有关。
Abstract:Recent discovery of large-scale potassium-rich brine and potassium minerals in Jiangling depression have attracted much attention increasingly. Formation of potash deposits are closely related to paleoenvironment. In this paper, through the element geochemistry and salt mineral inclusions homogenization temperature analysis to restore the paleotemperature of Late Paleocene- Early Eocene. Shashi Formation and the lower section of Xingouzui Formation in Jiangling Depression deposed a thick rock series of salt. Salts of mineral fluid inclusion body refers to surface water (sea, Lake) under the strong evaporation, the formation of mineral salts tend to capture the mother liquor, they preserve the various information of the lithosphere, can provide reliable quantitative data for the study of paleotemperature and paleoenvironment. The homogenization temperatures of primary fluid inclusions inhalite from the middle section of Xingouzui Formation of Early Eocene were measured by freezing method. Temperature results show that the homogenization temperature range is 14.9~32.3℃, the average is 23.7℃ and the temperature data of each sample is not stable. This shows that the Early Eocene paleotemperature in middle of Xingouzui Formation in Jiangling Depression was higher and relatively stable, which belongs to the warm and dry climate. In addition, by comparing with previous research, trying to restore the Late Paleocene-Early Eocene paleoenvironment change trend and exploring the relationship between the trend and PETM.
keywords:geochemistry halite fluid inclusions homogenization temperature paleoenvironment PETM Early Eocene Jiangling Depression
文章编号：
中图分类号：P619.211
文献标志码：
基金项目:本文得到国家973项目（编号：2011CB403007）、国家自然科学基金青年基金（编号：41502089）、中国地质大调查项目（编号：12120114051901）和中央级公益性科研院所基本科研业务费专项（编号：K1415）
引用文本：
李皓楠,王春连,刘成林,杨申谷,徐海明,余小灿,胡海兵.2016.江陵凹陷早始新世石盐流体包裹体均一温度研究及其古气候意义[J].矿床地质,35(6):1205~1216LI HaoNan,WANG ChunLian,LIU ChengLin,YANG ShenGu,XU HaiMing,YU XiaoCan,HU HaiBing.2016.A research on Early Eocene homogenization temperature of fluid inclusions in halite and its paleoclimatic significance in Jiangling Depression[J].Mineral Deposits35(6):1205~1216
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