黔北黑色岩系干酪根特征与碳同位素指示意义

CHARACTERS OF LOWER CAMBRIAN BLACK SHALE SERIES′ KEROGEN AND THEIR CARBON ISOTOPE IMPLICATIONS IN NORTHERN GUIZHOU PROVINCE

对发育于黔北震旦纪寒武统黑色岩系进行干酪根及碳同位素特征分析结果表明:黑色岩系干酪根组份平均含量达87.5%,干酪根类型为 型;镜质体反射率表明其形成温度为60℃～250℃之间;有机元素组成以高碳含量为特征,基本上w(C)>w(O)>w(H);所含有机质属轻碳同位素类型,δ13CPDB值为-23.74‰～-31.63‰之间指示为一种压力较大,海水较深,闭塞近古陆海湾环境。

This paper analysis kerogen and carbon isotope of the Lower Cambrian black shale series in northern Guizhou province. Studies show that the average content of kerogen components is about 87.5%, and the kind of kerogen isⅠtype, i.e. sapropelic type. The organic elements make a feature of high-carbin-contents, and the contents of carban are higher than those of oxygen, and the contents of oxygen are higher than those of hydrogen. The organic substances of black shale series belong to light carbon istope type, whose δ^(13)C_(PDB) is between -23.74‰ to (-31.63‰).The sdudy of kerogen and carbon isotope for black shale series has great significance to expound rock-forming condition and ore-forming condition.