藏北南羌塘坳陷盆地中侏罗世硅化木的发现与意义

Discovery and Implication on Silicified Wood of the Jurassic in Depression Basin of Nanqiangtang,North Tibet

首次在藏北南羌塘坳陷地区中侏罗世晚期地层中发现硅化木,本文对硅化木的基本特征进行了描述,据同一层位中采集的大量孢粉及双壳类化石证明,该硅化木属中晚侏罗世。结合区域地质及含硅化木地层的沉积学特征分析表明,南羌塘坳陷地区中侏罗世晚期属干热-潮温气候,从而深化了对青藏高原中侏罗世晚期气候环境的认识。

Silicified wood happen to first one found within the beds of late middle Jurassic in depression region of Nanqiangtang, North Tibet, this paper describes basic features of the silicified wood, which is attributed to middle - upper Jurassic by plentiful evidences of rendoze and bivalve fossils collected from same horizon. Together with regional geology and sedimentary characteristic of the strata with silicified wood, the study shows the Nanqiangtang depression area of late - phase middle Jurassic is in hot - humid temperature, further strengthening the acknowledges for climate and environment of late middle Jurassic in Tibet Plateau.