| 甘肃西成铅锌矿田泥盆纪吉维特-弗拉斯期沉积古地理及控矿意义 |
| |
| 引用本文： | 杜远生,赵锡文.甘肃西成铅锌矿田泥盆纪吉维特-弗拉斯期沉积古地理及控矿意义[J].沉积学报,1991,9(3):22-30. |
| |
| 作者姓名： | 杜远生 赵锡文 |
| |
| 作者单位： | 中国地质大学, 武汉 |
| |
| 摘 要： | 本文在牙形石生物地层对比的基础上.着重讨论吉维特-弗拉斯期的沉积相和沉积古地理。将该期地层红岭山组分为陆棚、开阔台地、局限台地、生物礁和丘、礁前斜坡及泻湖六个相及十二个微相.提出西成地区泥盆纪存在-南北两侧均有镶边礁的小型碳酸盐台地.礁间泻湖区是该区铅锌矿成矿的有利部位.也是今后寻找铅锌矿的重点靶区。
|
| 关 键 词： | 甘肃西成铅锌矿田 泥盆系 沉积相和冗积古地理 碳酸盐台地 控矿作用 |
| 收稿时间： | 1990-03-09 |
The Sedimentary Paleogeography of Givetian-Frasnian (Devonian) and Its Ore-Controlling Significance in Xicheng Pb-Zn Orefield,Gansu Province |
| |
| Institution: | China University of Geoscience, Wuhan |
| |
| Abstract: | The Xicheng Pb-Zn orefield is one of the most famous orefields in China. Xihanshui Group of Devonian is the main Pb-Zn ore bearing stratum, which was divided into three formation. In this paper, stratigraphic correlation of Givetian-Frasnian (Honglingshan Formation) is made through analysing conodonts in this area and its sedimentary facies and paleogeography. Honglingshan Fomation in this area consists of 12 types of microfacies and 6 macro facies which are: open shelf, open platform, restricted platform, reef and bioherm, forereef slope and lagoon facies. Honglingshan Formation in Xicheng aera is suggested being a rim carbonate platform, on the northern and southern edges of which are rim reefs or bioherms. Thus, there were five sedimentary areas and belts of facies in Givetian and Frasnian, which are: 1) northern open shelf area, 2) Dongshan-Changba reefs belts (windward), 3) Shepu-Xiangyangshan lagoon area, 4) Yeshuihe-Bijiashan reefs belts (leeward), and 5) southern open shelf area. The most of Pb-Zn ore deposits in Xicheng orefield are in the lagoon area between the north and the south reefs belts, showing the lagoon basin is a favourable area to form Pb-Zn ore, which is an important area to explore Pb-Zn ore in the future. |
| |
| Keywords: | |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《沉积学报》浏览原始摘要信息 |
| 点击此处可从《沉积学报》下载免费的PDF全文 |
|
