摘要
长江口地区不同沉积环境的现代表层沉积物和全新世沉积物中的绿色颗粒,从形态上可以分为三类:颗粒状、书页状和生物状。主要形成于浅海(大陆架现代沉积区和残留沉积区),但因风暴、潮流和波浪的搬运作用,也可以出现于长江口现代沉积区、长江下游河道和滨岸沼泽等非浅海相环境。因其分布在一定程度上受水动力条件的控制,将其用以指相时,必须考虑此一因素。
Green grains in the Yangtse River mouth area can be classified into threegroups:granular,sheet-like and test-mould.The grains are mainly authigenesis in neritic facies.They may occur inother non-marine sedimentary facies such as channel,recent sedimentary areaand seashore lake basin bog in lower reaches of the river due to the trans-portation of waves,tidal currents and storms.The grains in the relict sedi-mentary areas and in the recent sedimentary areas on the continental shelfare abundant and sheet-like and test-mould particles developed well.Theabundances of the green grains in the recent sedimentary areas of the YangtseRiver Mouth changes greatly.They may be much higher in deep channels,while much lower in fast-depositing areas where the dynamic condition ismuch weaker.The grains may be carried into typical limnic facies by stormsbut the abundances of those are much lower and the particles are mostlyblack ovoid.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1989年第2期145-153,共9页
Oil & Gas Geology
基金
国家自然科学基金
