沧参1井石炭、二叠纪地层粘土矿物年代学研究

GEOCHRONOLOGICAL STUDIES ON CLAY MINERALS IN CARBONIFEROUS AND PERMIAN STRATA OF CANGCAN WELL NO.1

笔者对沧参1井石炭、二叠纪地层中的粘土矿物特征进行研究，并对不同深度的粘土矿物进行了K－Ar、40Ar－39Ar及Rb－Sr法同位素地质年龄测定，得出至少存在三期伊利石的结论；碎屑伊利石，年龄为400Ma左右，在235—243Ma时受到热扰动；海西期末一印支早期形成的高温伊利石，其年龄为214—234Ma，在145Ma时经受一次热扰动；早侏罗世时期形成的伊利石，年龄为180Ma左右，分布比较普遍。这一研究结果无疑将有助于深入探讨区域地热场的演化，以及进一步研究有关地层的生、储油气能力。

This paper deals with studies on clay minerals in Carboniferous (C) and Permian (P) strata of Cangcan Well No. 1 and geochronological determination on those clay minerals in different depths by K-Ar,40Ar-39Ar and Rb-Sr methods. The results show that illites were formed in at least three different stages Clastic illite was formed at about 400 Ma and disturbed by heat at the ages between 214-234 Ma. High temperature illite has ages between 214-233Ma, corresponding to Late Hercynian-Early Indosinian Periods, and was disturbed by heat at the age of 145Ma. Widely distributed illite was formed in Early Jurassic Period, 180Ma. All of these results are undoubtedly helpful to further study on regional heat evolution history and oil-gas bearing and pro dueing abilities of the relevant strata.