The Formation of Polycrystalline Diamond: A Microstructural and Microanalytical Study of Carbonado

Heaney这个项目将研究碳酸盐的同位素结构，各种聚晶金刚石。据推测，碳酸盐岩不是在上地幔形成的，而是由先前存在的有机碳结晶而成的。PI将检查来自巴西和中非共和国的炭黑酒样本。他们将解决以下问题：(1)碳的来源是什么？(2)陨石冲击的微观结构证据是什么？(3) ree -磷酸盐是否通过裂变形成？(4)这些黑金刚石是作为单一事件或过程的一部分结晶的吗？将使用多种微量分析技术。电子探针和透射电镜将用于研究激波织构。SIMS将用于确定C同位素和REE比率。

9706143 Heaney This project will investigate the isotopic structure of carbonado, a variety of polycrystalline diamond. It is hypothesized that carbonado did not form in the upper mantle, but crystallized from preexisting organic carbon. The PI's will examine carbonado samples from Brazil and the Central African Republic. They will address the following questions: (1) what is the source of the carbon? (2) What is the microstructural evidence for meteoritic shock? (3) Did the REE-phosphates form by fissiogenic processes? (4) Did these carbonados crystallize as part of a single event or process? A variety of microanalytical techniques will be used. Electron microprobe and TEM will be used to investigate shock textures. SIMS will be used to determine C isotopes and REE ratios.