Short-lived nuclide systems in sulfides from enstatite chondrites

顽辉石球粒陨石硫化物中的短寿命核素系统

• 批准号: 211676195
• 负责人: Professor Dr. Mario Trieloff
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/211676195?language=en
• 关键词: Short; lived; nuclide; systems; sulfides

Enstatite chondrites are meteorites that originated under highly reducing conditions in the solar nebula. They contain different generations of a variety of sulfides, e.g. oldhamite, sphalerite, troilite, and niningerite. Based on thermodynamic models and petrological observations, some generations of oldhamite appear to be among the earliest solar nebula condensates. This circumstance, along with old absolute ages and the presence of short-lived nuclide decay products are the basic scientific motivation of our study. We suggest studying short-lived isotope systems 53Mn-53Cr, 60Fe-60Ni and 41Ca-41K by high precision SIMS analyses (using the CAMECA IMS 1280 HR applied for in the central SPP project) along with careful standard mineralogical and petrological, SEM and electron microprobe investigations of primarily oldhamite from primitive enstatite chondrites. K isotope analyses are particularly promising with the CAMECA 1280 HR, due to its high mass resolution. We expect new results allowing new insights into the history of the early solar system and the formation of enstatite chondrite parent bodies and their constituents.

顽火辉石陨石是在太阳星云中高度还原的条件下产生的陨石。它们含有不同世代的各种硫化物，如奥辉硫铁矿、闪锌矿、硫铁矿和硫镍铁矿。根据热力学模型和岩石学观测，某些世代的奥辉石似乎是最早的太阳星云凝聚物。这种情况，加上绝对年龄大和短寿命核素衰变产物的存在，沿着是我们研究的基本科学动机。我们建议通过高精度西姆斯分析（使用在中央SPP项目中应用的CAMECA IMS 1280 HR）研究短寿命同位素系统53 Mn-53 Cr、60 Fe-60 Ni和41 Ca-41 K，同时沿着对原始顽火辉石中的主要奥辉锑铅矿进行仔细的标准矿物学和岩石学、SEM和电子探针研究。由于CAMECA 1280 HR的高质量分辨率，K同位素分析特别有前途。我们期待新的结果，允许新的见解，早期太阳系的历史和顽火辉石球粒陨石母体及其成分的形成。