沉积岩中成岩伊利石年龄测定研究进展

doi:10.11867/j.issn.1001-8166.2002.05.0693

地球科学进展 ›› 2002, Vol. 17 ›› Issue (5): 693 -698. doi: 10.11867/j.issn.1001-8166.2002.05.0693

沉积岩中成岩伊利石年龄测定研究进展

车忱 ¹,杨忠芳 ¹ ,季峻峰 ²

1.中国地质大学地球科学与资源学院，北京 100083；2.南京大学地球科学系，江苏南京 210093

收稿日期:2002-02-04 修回日期:2002-05-08 出版日期:2002-12-20
通讯作者: 车忱（1972-），男，山西太原市人，硕士研究生，主要从事同位素地球化学研究.E-mail: chechen@cugb.edu.cn E-mail:chechen@cugb.edu.cn
基金资助:
国家自然科学基金项目“沉积盆地油藏形成时期的伊利石定年研究”(编号：4997249)资助.

RESEARCH PROGRESS OF DATING OF AUTHEGENIC ILLITE IN SEDIMENT

CHE Chen ¹,YANG Zhong-fang ¹,JI Jun-feng ²

1. China University of Geosciences，Beijing 100083, China;2. Nanjing University，Nanjing 210093, China

Received:2002-02-04 Revised:2002-05-08 Online:2002-12-20 Published:2002-10-01

伊利石的形成与盆地的沉积和热演化有密切关系，它可以指示油气的形成时代，因此测定成岩伊利石的形成年龄是一个重要的课题。碎屑伊利石往往与成岩伊利石共生，导致样品的年龄远远大于成岩伊利石的真实年龄。为了有效地分离成岩和碎屑伊利石，需要使用IAA法和烷基胺阳离子取代法等，结合真空密封法等其他技术，能够得到更好的效果。并介绍了国外伊利石定年的研究现状。

关键词: 成岩/碎屑伊利石, IAA, 烷基胺阳离子取代法, 真空密封技术

The smectite-to-illite transformation has close relation with sediment and thermal history of basins. So illite can indicate period of oil formation. Dating of authegenic illite is an important task. K/Ar method and ⁴⁰Ar/³⁹Ar method are often applied to illite dating. The contamination of detrital illite hinders the direct application of isotope ages. In order to separate authegenic illite from detrital, IAA and alkylammonium methods are performed in illite separating. Before using IAA method, the samples must be separated by size. XRD spectrum shows that the content of authegenic illite is high in fine sample and the detrital illite is the major component in coarse sample. Each ages can be obtained respectively by K/Ar method. The above ages and the percentage of detrital illite have a linear relation. Authegenic and detrital ages can be calculated by extrapolation. Alkylammonium cations method is a new way to research the diagenetic age of sedimentary rocks. Alkylammonium cations can replace K cations in mica and illite stoichiometrically. Longer chain alkylammonium and more time replace more K cations than shorter chain and less time. Moreover, HRTEM observations indicate that the process is very selective: even in apparently homogenous illite or I/S, some crystals undergo opening and some remain unchanged. And the replacement of K cations by Alkylammonium cations is not restricted to crystal edges, but extends to entire interlayer. The above are the basic of alkylammonium cations method applied to the diagenetic age of sedimentary rocks. It is generally assumed that there are no preferential removal of K and radiogenetic Ar. A common opinion is that after alkylammonium treatment, it can be inferred that detrital component are opened preferentially if K-Ar age decreases. Between diagenetic and detrital illites, alkylammonium reacts with detrital illite first. Some other approaches such as vacuum encapsulation are applied, which improve the effect of dating. Because the Argon's escape from authegenic and detrital illites need different temperatures, step heating method can separate two kinds of illites. This article briefs the present progresses of illite dating among the world.

Key words: Vacuum encapsulation., Authegenic/detrital illite, K/Ar method, ⁴⁰Ar/³⁹Ar method, IAA, Alkylammonium method

中图分类号:

P597

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