| 我国显生宙鲕铁石 |
| |
| 引用本文： | 廖士范.我国显生宙鲕铁石[J].沉积与特提斯地质,1993(3):1-8. |
| |
| 作者姓名： | 廖士范 |
| |
| 作者单位： | 贵州省地矿局 |
| |
| 摘 要： | 我国显生宙鲕铁石主要分布在我国中南、西南,其次为华东地区,主要产于中奥陶世,中、晚泥盆世,早、中侏罗世地层中,以晚泥盆世最为重要,其矿石储量占70.5％,沉积条件最好,为接近封闭的浅海泻湖中。奥陶纪及泥盆纪海水中沉积的鲕粒直径分别为0.7—2mm,0.2—0.8mm。侏罗纪湖水沉积的鲕铁石直径为0.15—0.66mm。鲕粒环带的形成,与水体波动能量使铁质围绕碎屑矿物,或围绕先已形成的自形晶微粒铁矿物旋转有关。静水沉积时能量小,无环带形成,多为无核心的铁质团粒。鲕粒环带,杂基多为自形晶铁矿物或碳酸盐物,鲕核有的为石英碎屑,右的为自形晶铁矿物或碎屑铁矿物。
|
| 关 键 词： | 显生宙 鲕铁石 沉积环境 |
| 收稿时间： | 1990/11/2 0:00:00 |
PHANEROZOIC OOLITIC IRONSTONE IN CHINA |
| |
| Liao Shifan.PHANEROZOIC OOLITIC IRONSTONE IN CHINA[J].Sedimentary Geology and Tethyan Geology,1993(3):1-8. |
| |
| Authors: | Liao Shifan |
| |
| Institution: | Guizhou Bureau of Geology and Mineral Resources |
| |
| Abstract: | The Phanerozoic oolitic ironstone in southern and eastern China occurs in the strata ranging in age from Middle Ordovician through Middle and Late Devonian to Early and Middle Jurassic times, especially in the Late Devonian strata where almost 70.5% of the ore reserves have been explored and confined to the subenclosed shallow-marine lagoons. The ooids deposited in the Ordovician and Devonian sea water vary in diameter from 0.7 to 2 mm and from 0.2 to 0.8mm, respectively, whereas those deposited in the Jurassic lake water from 0.15 to 0.66mm. The oolitic girdles were formed in the marine and lacustrine water. The water body energy impelled the ferruginous colloids or suspended matter to rotate around quartz fragments or the preexisting microgranular iron minerals as euhedral crystals to form the ooids (with nuclei or without nuclei). The oolitic girdles and matrix consist mostly of euhedral iron minerals or carbonates, while the oolitic nuclei are composed either of quartz fragments, or of euhedral iron minerals or clastic iron minerals. |
| |
| Keywords: | Phanerozoic oolitic ironstone sedimentary environment |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《沉积与特提斯地质》浏览原始摘要信息 |
| 点击此处可从《沉积与特提斯地质》下载免费的PDF全文 |
|
