| 西成矿田中泥盆统碳酸盐岩沉积微相、微相组及其环境分析 |
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| 引用本文： | 宋春晖,武安斌.西成矿田中泥盆统碳酸盐岩沉积微相、微相组及其环境分析[J].沉积学报,1993,11(2):34-42. |
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| 作者姓名： | 宋春晖 武安斌 |
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| 作者单位： | 兰州大学地质系 |
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| 摘 要： | 西成地区中泥盆统碳酸盐岩分布广泛,岩石类型多,相变急剧。本文以结构成因分类为基础,将本区碳酸盐岩归纳为四类26种微相,并分析了每种微相的基本沉积条件和形成环境。据区内微相的相邻和共生关系,建立了10个主要微相组合,并解释了各种微相组的沉积环境及其演化。根据微相组控矿,提出半开阔台地凹陷盆地和生物滩(层)礁后浅水盆地是本区碳酸盐型铅锌矿成矿的有利环境。
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| 关 键 词： | 碳酸盐岩 沉积微相 微相组合 沉积环境 |
| 收稿时间： | 1991-12-23 |
Analysis of Microfacies,Microfacies Associations and Sedimentary Environments of Carbonate Rocks of the Middle Devonian in Xicheng Pb-Zn Orefield |
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| Institution: | Department of Geology, Lanzhou University |
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| Abstract: | The Xicheng Pb-Zn orefield locates in Gansu Province, is one of the most famous ore-fields in China. Its controlling horizon are Anjiacha and Xihanshui formations of the middle Devonian,and its ore-bearing rocks belong to marine clastic and carbonate rocks. Carbonate rocks characterized wide spreding, multi-rock types, rapid facies changment and good ore-bearing bedds. On the basis of textural origin classification and consulting the types of grains and sedimentary structures,the carbonate rocks can be divided into four types and twenty-six kinds of microfacies: include seven kinds of grainstone(MG1-MG7),six kinds of wackestone (GM1-GM6),nine kinds of mudstone(M1 -M9) and four kinds of hermatobiolith(R1 -R4). The microfacies represent respectively different sedimentary conditions and environments. Ten kinds of microfacies associations have been estabilished according to neighbouring and paragenetic relationship of micro-facies. Each association corresponds a designated sedimentary environment and its evolution: such as (Fig. 1) open platform, uppertidal zone-swamp in restricted platform, sag basin of semi-open platform, reef-fore-reef-reef-back, biogenic bank(or stratigraphic reef)-shallow basin behind bank-shelf and shelf point reef shelf. On the basis of microfacies associations controlling Pb-Zn ore,this paper shows that sag basin of semi-open platform and shollow basin behind the bank are a favourable environments to form Pb-Zn ore. |
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