摘要
通过对冀东兴隆 -宽城地区多金属硫铁矿床中黄铁矿叠层石有机地球化学及生物标志化合物的研究。发现这些叠层石中 n C15- n C2 5规则类异戊二稀烷烃含量丰富 ,植烷 (Ph)、姥鲛烷 (Pr)含量较高。饱和烃 /芳烃之比为 1. 2～ 1. 9,有机质类型属低等生物为主的腐泥型 ,有机成熟度较高。研究结果表明黄铁矿叠层石是原生藻沉积构造。它们是在较封闭还原环境中 ,海底热水喷口附近嗜热藻细菌大量繁殖 ,并对喷气作用带来的成矿物质产生吸附作用与还原作用。从而在热液喷口附近发生了强烈的生物化学合成作用 ,形成了黄铁矿叠层石。藻类生物群落在热液丘堤表面的不均匀分布 ,产生了黄铁矿叠层石点状礁体。
Polymetallic pyrite deposits in Xinglong\|Kuancheng area of east Hebei have been studied with regard to their stromatolitic rocks,aiming at sheding light on their organic geochemistry and organic indicators.The results indicate that the rocks have a relatively high percentage of nC 15 —nC 25 ,alkyl hydrocarbons of isoprenoid composed predominantly of Ph(phytane)and Pr(pristane)with a fairly high ratio of hydrocarbon(arene=1\^2～1\^9).The organic materials of the rocks fall into the category of saprolite featuring a perfect organic saprofication and a high remains of low organisms.In fact,the stromatolitic structure of the pyrite is attributed to burial and diagenetic change of algal organisms.This biotic population resided and flourished round hot vents on seabeds due to its hot addiction,took up and reduced mineral materials from the vents,thus readjusting them biochemically and eventually forming an uneven scatter of algal reef which consisted essentially of pyritic stromatolite.
出处
《矿床地质》
CAS
CSCD
北大核心
2000年第1期61-67,共7页
Mineral Deposits
基金
化工部重点地质找矿科研项目资助!(编号 :97-地 -0 6)
