摘要
本文介绍了在我国浙江黄岩市首次发现上侏罗纪西山头组(J3x)地层中的硅化木。硅化木位于黄岩城西南约12km的大魏头山的火山岩地区,具体岩性为英安质晶屑玻屑凝灰岩,硅化木顺层呈似层状、透状、镶嵌状,平卧在凝灰岩层中,它与浙江新昌发现的硅化木有着重大区别。(1)前者产出层位是陆相火山爆发相的凝灰岩,后者是河湖相沉积岩;(2)前者是晚侏罗世,后者是早白垩世,前者要比后者早5￣6千万年;(3)前者成因机理相对复杂。黄岩硅化木的发现为侏罗世时期大型植物化石提供了新材料,对这一时期地层古生物、古生态研究提供了重要实物证据,为侏罗世地质研究提供了基础。
The late Jurassic （J3X） fossil woods are first found in Huangyan, Zhejiang Povince, East China. The Huangyan fossil woods （HFW） are located in a lava area of Dawei mountain, about 12 kilometers southwest of Huanyan city, and scattered in tuff. There are significant difference between HFW and other fossil woods that have been found in Xinchang, Zhejiang Province. The studies showed that （1） HFW are found in vocalnic tuff while the others in sedimentary rocks; （2） HFW belong to the late Jurassic in age and are earlier 50-60 million years than the others （early Cretaceous）; （3） A relative complex formation mechanism for HFW. The finding of HFW suggested that huge plants had emerged in Jurassic period and provided key fossil evidence for paleobiology and paleoecology studies for this geological time.
出处
《科技通报》
2006年第1期33-35,40,共4页
Bulletin of Science and Technology
关键词
硅化木
晚侏罗世纪
黄岩
浙江
fossil wood
late Jurassic
Huangyan
Zhejiang, China
