摘要
在浙江省临海市上盘镇岙里村北首次发现浙江翼龙化石的地层剖面上,共采集了8块火山碎屑岩石标本。在系统薄片观察的基础上,经过特殊处理,分选出其中的长石单矿物,用K-Ar同位素稀释技术定年。其表观年龄值域自76.5Ma至83.3Ma,中值为81.1Ma。^(40)Ar/^(36)Ar-^(40)K/^(36)Ar等时线年龄在相关系数为0.9990时是81.5 Ma。这一年龄在国际地层表中当属晚白垩,该年龄值既是浙江翼龙的年龄,又是该化石所赋存的塘上组火山沉积岩的形成时代。浙江翼龙的进化特征和产出时代可与北美洲的相对比。
The eight pyroclastic rock samples were collected from the stratum section where the Zhejianopterus Cai (Ms) gen. nov. was found firstly in the north of the Aoli village, Shangpan town, Linhai county, Zhejiang province. The separated feldspar were got by special treatment after a systematic thin section investigation, then the K-Ar ages were determined by the isotope dilution method. Apparent age ranging is from 76.5Ma to 83.3Ma with a mean value of 81.1Ma while 40Ar36Ar-40K/36Ar isochron age is 81.5Ma with a relativity of 0.9990. The age should belong to late Cretaceous period on the basis of the International Global Stratigraphic Chart. The age are either the age of Zhejianpterus or the age of the volcanic sedimentary strata belonging to the Tangshang group. The evolutional characteristics and occurence of Zhejianopterus well compared with that of north America.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1992年第2期250-256,共7页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
关键词
翼龙
化石
K-AR年龄
塘上组
Zhejianpterus
K-Ar age
Geological significance
