华南泥盆纪Chondrites的特征及其对古氧相的示踪  

Chondrites from the Devonian Neritic Cruziana Ichnofacies as Indicators of Palaeo-oxygenation Facies in South China

作　　者：马会珍 张立军[2] 龚一鸣[2,3] 

机构地区：[1]贵州省地质调查院,贵州贵阳550005 [2]中国地质大学生物地质与环境地质教育部重点实验室,湖北武汉430074 [3]河南理工大学生物遗迹与沉积矿产河南省重点实验室,河南焦作454003

出　　处：《地球科学进展》2010年第9期966-973,共8页Advances in Earth Science

基　　金：国家自然科学基金项目"动藻迹(Zoophycos)的地球生物学研究"(编号:40872001)资助

摘　　要：系统描述了发育于广西六景、贵州独山、贵阳乌当泥盆纪3个浅海沉积区Cruziana遗迹相Chondrites的产出特征,结合华南泥盆纪其他5个浅海沉积区Cruziana遗迹相的Chondrites资料,对Chondtites的寄主岩系颜色分级、遗迹组构、潜穴直径、遗迹属种的综合研究表明,只有寄主岩系为深灰色—黑色,岩性为灰岩、泥灰岩,潜穴直径小于1 mm,无其他遗迹化石共生时,Chondrites才是贫氧环境标志性遗迹化石的新认识,而个体粗大的Chondrites常发育在常氧环境中。Chondrites widely occurred in the Devonian neritic Cruziana ichnofacies from the Liujing, Dushan and Wudang sections in South China. Colors of host strata, ichnofabrics and burrow size as well as taxonomy of Chondrites have been studied from 8 selected marine regions in South China. Our data indicated that only those small Chondrites （burrow size 〈 1 mm） preserved in dark, dark grey limestones, mudstones and marls can be viewed as evidence of dysaerobic environments, and that large and strong Chondrites can be found in strata deposited in oxic facies.

关 键 词：CHONDRITES 泥盆纪 Cruziana遗迹相 古氧相 

分 类 号：P618.67[天文地球—矿床学]