Acquisition of a tunable diode laser system (TILDAS) Aerodyne Mini-TILDAS CO2 Isotope Monitor for triple isotope analyses of CO2 gas from carbonates

这项地球科学仪器和设施计划赠款支持购买设备，该设备可以分析从碳酸盐岩石和矿物中释放出来的二氧化碳气体中含有的所有稳定的氧同位素(16O、17O和18O)，以便能够进一步研究地层记录中记录的地球过去的气候和环境条件。该仪器将服务于大量教职员工和学生的研究需求，最初支持研究团队中两名研究生、一名博士后科学家和两名早期职业科学家的教育。该仪器将安置在新墨西哥大学稳定同位素中心(CSI)，该中心每周举办一次学生研讨会，并每年举办一次学生竞赛，以资助有价值的项目实验室分析费用。将获得可调红外激光直接吸收光谱(Tildas)。调查人员将利用该仪器对沉积碳酸盐进行三重氧同位素研究，作为其形成温度和地层流体同位素组成的代用。Tildas可用于170度测量，是一种新的仪器，具有预期的分析精度，可与传统的氟化法相媲美。Tildas分析时间为30分钟，而不是4天，然后是传统的气源稳定同位素比质谱仪(SIRMS)。Tildas可以分析比SIRMS小一个数量级的样本大小。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This Division of Earth Sciences Instrumentation and Facilities Program grant supports acquisition of device that permits analysis of all the stable isotopes of Oxygen (16O, 17O and 18O) contained in carbon dioxide gas liberated from carbonate rocks and minerals to enable advanced studies of Earth’s past climate and environmental conditions as recorded in the stratigraphic record. The instrument will serve the research needs of a large number of faculty and students, initially supporting the education of two graduate students, a postdoctoral scientist and two early career scientists on the investigator team. The instrument will be housed in the University of New Mexico Center for Stable Isotopes (CSI) which hosts weekly student seminars and hosts an annual student competition to support meritorious project laboratory analytical costs.A tunable infrared laser direct absorption spectroscopy (TILDAS) will be acquired. The investigators will employ the instrument for triple oxygen isotope studies of sedimentary carbonates as proxies of the temperature of their formation and isotopic composition of formation fluids. A TILDAS tuned for 17O measurements is a new instrument with anticipated analytical precision rivaling the traditional fluorination method. TILDAS analysis times are 30 minutes versus 4 days for fluorination followed by traditional gas source stable isotope ratio mass spectrometry (SIRMS). TILDAS can analyze sample sizes an order of magnitude smaller than SIRMS.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.