《第21届凯洛林国际会议暨2019京津冀高层论坛》

第21届凯洛林国际会议暨2019京津冀高层论坛论文摘要格式及模板“第21届凯洛林国际地质会议暨2019京津冀生态地质环境协同发展高层论坛”召开之前，将出版论文摘要集（英文）。摘要主要由目的、方法、结果、结论、致谢等几部分构成。要求控制在一页A4纸张，具体格式如下（摘要模板见附件）：一、页面设置页面设置为普通格式：纸张为纵向，上、下页边距2.54厘米，左、右页边距3.18厘米。二、字体字号全文字体为新罗马，正文字号一般为10磅。其中，标题字号为新罗马，加粗，14磅；作者姓氏拼音全为大写，名字的首字母为大写；作者单位为新罗马斜体，9磅；作者简介为新罗马，9磅。“目的、方法、结果、结论、致谢”字体为新罗马，加粗，10磅。三、行距标题行距16磅，作者行距13磅，全文其它行距均为11磅，段前段后为0磅。全文基本为左对齐，但正文段落要求首行缩进0.35厘米。标题和作者之间空两行；作者和作者单位之间空一行；作者单位和作者简介之间空一行；作者简介和正文之间空一行；“目的、方法、结果、结论、致谢”与上下文各空一行，行距均11磅。四、其它一般情况，题名不宜过长，要求控制在两行以内；作者不宜太多，要求控制在7人以内。摘要正文及结尾不设置（或引用）参考文献，请您保证摘要的原创性，且注意学术版权。附件：摘要模板Rb-Sr Dating of Sulfides from the Huogeqi Copper-Lead-Zinc Polymetallic Deposit in Inner MongoliaCHEN Chao, HU Huabin*, NIU Shuyin, ZHANG Fuxiang, LI Liang, BAI Xiaoxuan, SU BaoqiCollege of Resources, Key Laboratory of Regional Geology and Mineralization, Hebei GEO University, Shijiazhuang 050031, Hebei, ChinaThe first author: Chen Chao (1981-)，male, associate professor, doctor, mainly engaged in teaching and scientific research of structural geology. E-mail: goldcc* Corresponding author. E-mail: huhb27ObjectiveThe Huogeqi copper-lead-zinc polymetallic deposit in Inner Mongolia is located in the western part of the Middle-Late Proterozoic Langshan rift trough situated on the northern border of North China Platform. Previous studies suggest that the Huogeqi deposit is a sedimentary exhalative deposit and that the main metallogenic epoch was the Middle-Late Proterozoic, with metallogenic superimposition or transformation in later period. There is a lack of necessary chronological evidence of ore sulfides, required to support mineralization events later. This work conducted Rb-Sr dating of sulfides to constrain the metallogenic epoch of this deposit, which provides good chronological evidence for the comprehensive study of copper-lead-zinc-iron mineralization in this area.MethodsThe massive lead-zinc ores were chosen and eleven samples of pyrrhotite, galena, and sphalerite minerals were selected from the ores. The processing of samples and testing of Rb-Sr dating were performed at the Nanjing Nantai Geological Testing Institute. The isotopic analyses of Rb and Sr were carried out on a VG 354 mass spectrometer with five collectors. The reproducibility and accuracy of isotope values were verified by running the Standard Reference Material NBS 987 and Laboratory Standard La Jolla, with a certified 87Sr/86Sr value of 0.7102360.000007. The Rb-Sr isochron diagrams and calculations were achieved using Isoplot/ Ex_ver3.ResultsThe test data of six samples of pyrite, two samples of galena, and three samples of sphalerite are shown in Appendix 1. The contents of Rb and Sr range from 0.1873 ppm to 2.7820 ppm and 1.817 ppm to 6.585 ppm, respectively, with the 87Rb/86Sr ratio of 0.10353.981 and the 87Sr/86Sr ratio of 0.7099030.000008 to 0.7247360.000008. The ratio of 87Rb/86Sr87Sr/86Sr has a wide range of variation, which reveals that there are differentiations between Rb and Sr in sulfides. The isochron age of Rb-Sr is 267.2 2.5Ma with MSWD of 1.5, obtained from seven data samples, except Nos. 2, 3, 8 and 9 (due to discrete points). The age is relatively consistent with the weighted average age of 274.32.4Ma and MSWD of 1.17 for LA-ICP-MS zircon U-Pb from No.3 orebody(unpublished).ConclusionsRb-Sr dating in the Huogeqi copper-lead-zinc polymetallic deposit shows that the lead-zinc metallogenic epoch is mainly the Hercynian, instead of the previously suggested Middle-Late Proterozoic. The metallogenic age of the deposit is similar to that of the Oubugela, Aerqitu and Kouketaolegai porphyry copper-gold deposits in the Langshan area, which indicates that large-scale hydrothermal mineralization events in this period are a result of the Hercynian tectonic-magmatic activities in the Langshan area. This is the preliminary report on the Rb-Sr dating of sulfides of lead-zinc ores in the deposit. Additional research should be carried out on the metallogenic epoch of copper ores and iron ores in isotope dating in order to establish temporal and spatial relationships among copper, lead-zinc, and iron ores in the deposit.AcknowledgmentsThis research was supported by the Hebei Natural Science Foundation (grant No. D2019403015).