Fission-track-dating at drill cores from the ICDP/CCSD Donghai drill holes, China

中国东海 ICDP/CCSD 钻孔岩心裂变径迹测年

• 批准号: 5400612
• 负责人: Professor Dr. Günther A. Wagner
• 金额: --
• 依托单位: Professur für Geomorphologie und Bodengeographie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5400612?language=en
• 关键词: Fission; track; dating; drill; cores

The general aim of the project is to quantify the thermo-tectonic history of the Sulu UHP belt. The ICDP/CCSD-pre-pilot holes (PP1; PP2) and the main ICDP/CCSD-drill hole at Donghai, China, are keyholes that allow the continuous reconstruction of the medium to low temperature history (less than 300 °C) by applying fission-track thermochronology. Integration of petrologic and structural data will permit transferring the FT-T-t paths into a post-orogenic exhumation/uplift history. The combination with high temperature geochronometers will extend the thermotectonic history to the orogenic process. The thermochronological data will be compared, integrated in the database of the Qinling-Dabie-Sulu orogen, East-Central China and used to refine the recent thermo-tectonic models. We are the only research group in the German ICDP-program that have access to samples from the ICDP/CCSD Donghai drill holes. In addition, the samples of the drill holes will be used to improve further the standard fission track dating technique. Strong variations in the uranium content of grains from one sample need an improvement of the reproducibility of the automated switching between grain mount and detection mica. Furthermore, the precise measurement of a large number of confined track length, even in low uranium bearing apatites, will allow to better constraint the T-t models.

该项目的总体目标是量化苏鲁超高压带的热构造历史。ICDP/CCSD-预先导孔（PP 1; PP 2）和中国东海的ICDP/CCSD-主钻孔是通过应用裂变径迹热年代学连续重建中低温历史（低于300 °C）的关键孔。岩石学和结构数据的整合将允许将FT-T-t路径转移到后造山剥露/隆升历史中。与高温地质年代学的结合将把热构造史延伸到造山过程。本文将对秦岭-大别-苏鲁造山带的热年代学资料进行对比，并将其整合到中国中东部的数据库中，用于完善现代热构造模型。我们是德国ICDP项目中唯一能够获得ICDP/CCSD东海钻孔样品的研究小组。此外，钻孔样本将用于进一步改进标准裂变径迹测年技术。一个样品中颗粒铀含量的强烈变化需要提高颗粒安装和检测云母之间自动切换的再现性。此外，即使在含铀量低的磷灰石中，大量受限径迹长度的精确测量也将允许更好地约束T-t模型。