Exploring the archive data of low grade - high pressure metamorphic sedimentary successions

低品位-高压变质沉积层序档案资料探索

• 批准号: 270096603
• 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: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/270096603?language=en
• 关键词: Exploring; archive; data; low; grade

Despite blueschist facies high pressure (HP) metamorphism, metasedimentary rocks of the Anatolide-Tauride belt in western Anatolia exhibit widely distributed primary sedimentary texture. The rock types relevant for this proposal comprise previously undescribed evaporitic sequences in Lower Cretaceous pelagic successions of the Neotethys. The rocks are exposed over large areas and correlate in time to Aptian evaporites in the Atlantic ocean. Preliminary work showed that volumetrically important abundances of primary selenite crystals (up to 1.5 m crystal length) were transformed to aragonite during early diagenesis. Subduction-related deep burial was followed by exhumation, which led to the transformation from aragonite to calcite. Along with these processes, macro- and microscopic primary textures and structures remained unaltered. Petrographic investigations revealed exceptionally well-preserved primary textures in selected domains of these rocks. We propose to investigatephenomena of multiple pseudomorphism using mineralogical tools (EMPA, Raman spectrometry, cathodoluminescence), geochemistry (LA-ICP-MS) and isotope geochemistry of delta18O, delta13C, delta26Mg and 87Sr/86Sr isotopes. The aim of these investigations is to enhance the understanding of early diagenetic processes and metamorphic reactions as well as to quantify element fluxes. The research proposed here will potentially lead to a significantly increased understanding of geochemical fluxes and thermodynamic processes in low grade HP metasedimentary rocks leading to an improved understanding of these archive rocks.

尽管蓝片岩相高压（HP）变质，在西安纳托利亚的安纳托利-陶里德带的变质沉积岩显示出广泛分布的原生沉积结构。与本建议相关的岩石类型包括以前未描述的新特提斯下白垩纪远洋层序中的碳酸盐岩序列。这些岩石大面积暴露，与大西洋中的Aptian陨石在时间上相关。初步工作表明，体积重要丰度的原生亚硒酸盐晶体（长达1.5米的晶体长度）转化为文石在早期成岩作用。与俯冲作用有关的深埋藏之后是折返作用，这导致了文石向方解石的转变。沿着这些过程，宏观和微观原生结构和结构保持不变。岩相学调查显示，在这些岩石的选定领域保存异常完好的原生纹理。我们建议利用矿物学工具（EMPA、拉曼光谱、阴极发光）、地球化学（LA-ICP-MS）和δ 18 O、δ 13 C、δ 26 Mg和87 Sr/86 Sr同位素地球化学来研究多重假像现象。这些调查的目的是加强对早期成岩过程和变质反应的理解，以及量化元素通量。这里提出的研究将有可能导致一个显着增加了解地球化学通量和热力学过程中的低品位高压变质沉积岩，从而提高对这些档案岩石的理解。

项目成果

A lost Tethyan evaporitic basin: Evidence from a Cretaceous hemipelagic meta‐selenite – red chert association in the Eastern Mediterranean realm

失落的特提斯蒸发盆地：来自东地中海地区白垩纪半远洋变亚硒酸盐/红燧石组合的证据

• DOI: 10.1111/sed.12606
• 发表时间: 2019
• 期刊: Sedimentology
• 影响因子: 3.5
• 作者: Franziska Scheffler;Adrian Immenhauser;Amaury Pourteau;Osman Candan;Roland Oberhänsli
• 通讯作者: Roland Oberhänsli

Sedimentologic to metamorphic processes recorded in the high-pressure/low-temperature Mesozoic Rosetta Marble of Anatolia

• DOI: 10.1007/s00531-015-1214-y
• 发表时间: 2015
• 期刊: International Journal of Earth Sciences
• 影响因子: 2.3
• 作者: F. Scheffler;R. Oberhänsli;A. Pourteau;A. Immenhauser;O. Candan