碎屑锆石年代学在沉积物源研究中的应用及存在问题
- 1. 西北大学大陆动力学国家重点实验室/西北大学地质学系, 西安 710069;
- 2. 中国石化胜利油田东胜精攻石油开发集团股份有限公司, 山东东营 257000
基金项目:
国家自然科学重点基金项目（41330315）；西北大学研究生自主创新项目（YZZ15018）；中国地质调查局项目（12120113039900，12120114009201）
作者简介:
郭佩,女,1990年出生,博士研究生,盆地分析与石油地质,E-mail:nwupeig@126.com
- 收稿日期:
2016-01-18
- 录用日期:
2016-03-06
- 修回日期:
2016-03-04
- 刊出日期:
2017-02-10
摘要: 近年来，碎屑锆石U-Pb定年技术的不断突破极大地促进了沉积盆地物源分析的发展，该方法被进一步应用于分析古地理环境、沉积盆地演化以及物源区剥蚀速率等。在广泛应用的同时，国际学者逐渐意识到诸多不确定因素可影响分析结果、导致偏差。在系统总结碎屑锆石年代学在沉积物源研究中值得关注的几个问题的基础上，分析结果认为：①采样过程中要注意采样间隔和水动力对锆石的分选作用；②实验过程中合理地选择U-Pb定年方法，根据特定科学问题选定待测锆石和确定分析数量；③物源对比过程中不应简单地将沉积岩的碎屑锆石年龄谱与周缘造山带结晶岩体（包括岩浆岩和变质岩）的年龄进行对比，还应关注较老沉积岩提供的再旋回锆石、不同源岩的锆石产出能力、剥蚀区适当的隆升时间及碎屑锆石的“滞后时间”等因素。
Considerations on the Application of Detrital-Zircon Geochronology to Sedimentary Provenance Analysis
- 1. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China;
- 2. Shengli Oilfield Dongsheng Jinggong Petroleum Development Group, Dongying, Shandong 257000, China
Funds:
National Natural Science Fund Project, No.41330315;Independent Innovation Project of Northwest University, No.YZZ15018;China Geological Survey Project, No.12120113039900,12120114009201
- Received Date:
2016-01-18
- Accepted Date:
2016-03-06
- Rev Recd Date:
2016-03-04
- Publish Date:
2017-02-10
Abstract: In recent years, the growing breakthroughs in detrital-zircon U-Pb dating technology have fueled the development of provenance analysis of sedimentary basin, and this approach is further used to analyze paleogeographic environment, basin evolution and unroofing rate of provenance areas. Simultaneously, a number of potential problems that will lead to bias in applying detrital-zircon U-Pb geochronology to provenance analysis have increasingly attracted international attentions. On the basis of summarizing international relevant discussions, this paper concludes such considerations as sample intervals and hydrodynamic fractionation during sampling; reasonable choices of U-Pb dating methods, specific zircons and analytical numbers according to specific science issues during experiments; multi-recycling zircons, zircon-fertility ability, appropriate uplifting time and lag time during provenance comparison, and so on. The last of which is traditionally and simply conducted by matching detrital-zircon age spectrum of sediment units with crystallization age of source rocks in adjacent orogenic belts.
郭佩, 刘池洋, 王建强, 李长志. 碎屑锆石年代学在沉积物源研究中的应用及存在问题[J]. 沉积学报, 2017, 35(1): 46-56. doi: 10.14027/j.cnki.cjxb.2017.01.005
GUO Pei, LIU ChiYang, WANG JianQiang, LI ChangZhi. Considerations on the Application of Detrital-Zircon Geochronology to Sedimentary Provenance Analysis[J]. Acta Sedimentologica Sinica, 2017, 35(1): 46-56. doi: 10.14027/j.cnki.cjxb.2017.01.005
| Citation: |
GUO Pei, LIU ChiYang, WANG JianQiang, LI ChangZhi. Considerations on the Application of Detrital-Zircon Geochronology to Sedimentary Provenance Analysis[J]. Acta Sedimentologica Sinica, 2017, 35(1): 46-56. doi: 10.14027/j.cnki.cjxb.2017.01.005
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