地质与资源2019，Vol.28Issue(5)：434-442,9.
辽东本溪林家组属于中三叠世之锆石、古生物和地层证据
THE LINJIA FORMATION IN BENXI,EAST LIAONING PROVINCE ASS IGNED MIDDLE TRIASSIC:Evidences from Zircon,Fossil and Stratigraphy
摘要
Abstract
The Linjia Formation is outcropped in Linjiawaizi area,Benxi,eastern Liaoning Province. Since recorded by Kobayashi in 1942,its age has long been a great controversy. In the early 1980s,Zhang et al. suggested that the Linjia Formation should be assigned to Giddle Triassic on the basis of the plant fossils fish scales,insect wings,spores and pollens,as well as stratigraphic correlation. As the components of Linjia flora are very complicated with both Paleozoic and Gesozoic elements but without evidences of zircon ages,the age of Linjia Formation has not yet been determined. Recently,the metamorphic tuffaceous siltstones containing lots of zircons were found at the bottom of Linjia Formation. According to the dating results of 30 grains of zircon crystal,the average 206Pb/238U age of 4 newest zircons was 239.5±4.1 Ga. In addition,Pleuromeia shaolinii was lately discovered from Linjia Formation in Qiandianzi area. Although some significant fossil plants of Linjia flora are distributed striding cross Permian and Triassic,combined with the zircon dating,stratigraphic correlation,lithologic characteristics,parallel unconformity relation,typical Triassic fossil plants and the Giddle Triassic‐Early Cretaceous insect fossil Sogdoblatta,it is confirmed that the Linjia Formation belongs to Giddle Triassic.关键词
锆石U-Pb年龄/肋木属/索德蠊属/林家组/中三叠世/辽宁本溪Key words
zircon U‐Pb age/Pleuromeia/Sogdoblatta/Linjia Formation/Giddle Triassic/Benxi of Liaoning Province分类
天文与地球科学引用本文复制引用
张宜,郑少林,李之彤,曹成润,杨佳林,张国仁,李显东,孟繁巍..辽东本溪林家组属于中三叠世之锆石、古生物和地层证据[J].地质与资源,2019,28(5):434-442,9.基金项目
国家自然科学基金项目"辽宁本溪中三叠世林家植物群系统研究"(编号31470324) （编号31470324）
中国地质调查局项目"辽宁1:5万鞍山、大孤山幅区域地质调查"(编号DD20190042-01). （编号DD20190042-01）
