Establishing the Magnesium Isotope Signature of Dolomites

建立白云岩的镁同位素特征

• 批准号: 189689865
• 负责人: Professor Dr. Adrian Immenhauser
• 金额: --
• 依托单位: Institut für Geologie, Mineralogie und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/189689865?language=en
• 关键词: Establishing; Magnesium; Isotope; Signature; Dolomites

Magnesium is the 8th most abundant element in the continental crust and an important element in the hydrological and biological system and in the world’s oceans. Magnesium is the key element of dolomite and yet, published data on the magnesium-isotope signature of pene-contemporaneous and post-depositional dolomites and the impact of diagenesis on dolomite δ26Mg are at best scarce. This forms a strong motivation for an in depth magnesium-isotope study of various dolomite types using the state-of-the-art MC-ICP-MS facilities at the department of Sediment- and Isotope Geology at Bochum. The aims of this research proposal are (1) to test the hypothesis that specific dolomite types are characterized by specific δ26Mg signatures and (2) to assess the effects of increasing diagenetic alteration of pene-contemporaneous dolomite δ26Mg using the example of the Upper Triassic Hauptdolomit (Dolomia Principale) in the Alps. Depending on the outcome of the first two objectives, the compilation of a time-series δ26Mg stratigraphy of selected stratigraphic intervals is considered for the third project year. In the framework of this research, we intend to collaborate with expert colleagues from several institutions in order to obtain a broad selection of well-studied dolomite case examples including Precambrian and Phanerozoic material. The outcome of this work is of significance for those concerned with the dolomite problem in general and has the potential to represent a novel and independent approach for kinetic processes active during dolomite formation and stabilization.

镁是大陆地壳中第八丰富的元素，也是水文和生物系统以及世界海洋中的重要元素。镁是白云石的关键元素，目前已发表有关准同生岩和准同生岩的镁同位素特征数据。沉积后白云岩以及成岩作用对白云石 δ26Mg 的影响充其量是稀缺的，这为深入研究镁同位素提供了强有力的动力。使用波鸿沉积物和同位素地质学部门最先进的 MC-ICP-MS 设备对各种白云石类型进行研究 本研究计划的目的是 (1) 检验特定白云石类型特征的假设。通过特定的 δ26Mg 特征，以及 (2) 以上三叠统为例评估准同生白云岩 δ26Mg 成岩蚀变增加的影响阿尔卑斯山的 Hauptdolomit (Dolomia Primarye) 根据前两个目标的结果，在本研究的框架中考虑编制选定地层区间的时间序列 δ26Mg 地层。与来自多个机构的专家同事合作，以获得广泛研究的白云岩案例，包括前寒武纪和显生宙材料。这项工作的成果对于那些人来说具有重要意义。总体上关注白云石问题，并有潜力为白云石形成和稳定过程中活跃的动力学过程提供一种新颖且独立的方法。

项目成果

The magnesium isotope (δ26Mg) signature of dolomites

白云岩的镁同位素 (δ26Mg) 特征

• DOI: 10.1016/j.gca.2014.11.003
• 发表时间: 2015-01-15
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: A. Geske;R. Goldstein;V. Mavromatis;D. Richter;D. Buhl;T. Kluge;C. John;A. Immenhauser
• 通讯作者: A. Immenhauser

Magnesium isotope composition of sabkha porewater and related (Sub-)Recent stoichiometric dolomites, Abu Dhabi (UAE)

sabkha 孔隙水和相关（亚）新近化学计量白云岩的镁同位素组成，阿布扎比（阿联酋）

• DOI: 10.1016/j.chemgeo.2014.11.020
• 发表时间: 2015-01-30
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: A. Geske;S. Lokier;M. Dietzel;D. Richter;D. Buhl;A. Immenhauser
• 通讯作者: A. Immenhauser