地质与资源2011，Vol.20Issue(3)：167-171,5.
辽西建昌盆地义县组上部英安岩的40Ar/39Ar年龄及其地质意义
40Ar/39Ar STEPWISE HEATING AGE AND ITS GEOLOGICAL IMPLICATION OF THE DACITE AT THE UPPER PART OF THE YIXIAN FORMATION IN JIANCHANG BASIN,WESTERN LIAONING
摘要
Abstract
The Yixian Formation in the Jianchang basin, Liaoning Province consists of a series of volcanic-sedimentary rocks, which can be divided into two members from bottom to top. The first member is composed mostly of sedimentary rocks, including Yaolugou bed (the lower) and Luojiagou bed (the upper), with intermediate-basic volcanic rocks at the bottom of the member. The second member is mainly acid and intermediate volcanic rocks with clastic rocks. Biostratigraphically, the Luojiagou bed may be correlated to the Jianshangou (Zhuanchengzi) bed of Yixian Formation in Yixian-Beipiao area. The 40Ar/39Ar stepwise heating dating of the dacite sample at the upper part of the Yixian Formation in Jianchang basin yields an age of 120 Ma, which agrees with previous results obtained by K-Ar, Ar-Ar and U-Pb methods for the top of volcanic rocks of the Yixian Formation in the Yixian area.关键词
建昌盆地/义县组上部/英安岩/40Ar/39Ar同位素测年/辽西Key words
Jianchang basin/ the upper part of the Yixian Formation/ dacite/ 40Ar/39Ar stepwise heating age/ Western Liaoning Province分类
天文与地球科学引用本文复制引用
郑月娟,李永飞,郜晓勇,苏飞..辽西建昌盆地义县组上部英安岩的40Ar/39Ar年龄及其地质意义[J].地质与资源,2011,20(3):167-171,5.基金项目
中国地质调查局“古亚洲洋构造体制与滨太平洋构造体制叠加转变综合调查与研究”、“松辽盆地及其外围地层-构造格架与油气资源前景调查”(编号1212010813070)资助. （编号1212010813070）
