| 安徽巢县下石炭统中的生物扰动构造 |
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| 引用本文： | 赵澂林.安徽巢县下石炭统中的生物扰动构造[J].沉积学报,1986,4(1):43-48. |
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| 作者姓名： | 赵澂林 |
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| 作者单位： | 华东石油学院 |
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| 摘 要： | 安徽巢县地区有较发育的下石炭统地层,自下而上地层层序是:金陵组（C1j）、高丽山组（C1g）、和州组（C1h）。下伏为上泥盆统五通组（D3w）碎屑岩系,上覆为中石炭统黄龙组（C2h）碳酸盐岩系。是一套以碳酸盐岩为主的海相地层,夹一定数量的砂岩和泥岩,岩性、岩相变化较大。所含遗体化石较丰富,已有较好的地层学研究成果,但有关其中的生物扰动构造或遗迹化石尚缺报道。本文仅就野外所见的一些生物扰动现象,从沉积学的观点简述于下,供参考。实测剖面位于巢县北部凤凰山背斜南东翼麒麟山一带（图1）。
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| 收稿时间： | 1984-02-27 |
BIOTURBATE STRUCTURES OF LOWER CARBONIFEROUS SERIES IN CHAOXIAN COUNTY,ANHUI PROVINCE |
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| Institution: | East China Petroleum Institute |
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| Abstract: | The Lower Carboniferous Series is well developed in the Chanxian County area and can be divided into three formations: Jinling (C1j) , Ga-olishan ( C1g), and Hezhou ( C1h ) Formations. It is underlain by terrigenous clastic rocks of the Wutong Formation of Upper Devonian Series (D3w)and overlian by the carbonate rocks of the Huanglong Formation of the Middle Carboniferous series ( C2h ) . These formations are mostly composed of marine carbonates and commonly associated with sandstones and mudstones. It is 29 meters thick. Bioturbate structure appears mainly in the Gaolishan and Hezhou Formations. ( 1 ) Grey-white,medium-fine grained guartz arenite is a kind of very strong bioturbate rocks at the top of the Gaolishan Formation ( plate Ⅰ, 1、 2 ) . Two types of burrows can be seen on the weathered outcrop. The first type is large burrows with sand-filled laminae, which are 20cm long at the most, commonly 5-10cm long with diameters of 1-2cm. They mostly occur parallel to bedding planes. Some of them looks like heart-urchin burrows or possess echiurus burrows with spreites, and curved trails, redeposited tubes or conical pipes (H.E. Reineck, 1980, Fig. 554). The second type is shorter,single, bifurcated, or U-shaped borrws, perpendicular orinclined to bedding planes. The delicate forms can be preserved in single burrow systems. Most of them consist of dense, contorted, and interpenetrating burrows. These sandstones are the sediments of retransported organisms. They are formed from foreshore to upper shoreface in sandy beach. ( 2 ) A particular bioturbate structure-regular feeding trail can be found in grey-black micrite in the lower part of the Hezhou Formation ( pl-ateI, 3 ) . It is distributed along the bedding planes. It looks like the one in Fig. 4-23 in the "Sand and Sandstone" (Pettijohn, 1972), and Sei-lacher's (1964) "Zoophycus-facies", which are horizontal burrows in deep- water deposits, representing the rare trace fossils of offshore. ( 3 ) The upper slag limestone in the upper part of the Hezhou Formation is also a kind of strong bioturbate rocks. The slag or honeycomb-shaped structure appears at the top of the beds.Burrows may be bored holes of worms, molluscs and echinoderms, etc., which are generally smooth and either vertical or inclined at different angles to bedding planes. The filling of the bored holes is yellowgreen limemud ( plate 4, 5, Fig.2 ) . They were formed in the environments from upper shoreface to foreshore. Undoubtedly, the discovery of these marks would be helpful to the fa-cies-analysis of the Lower Carboniferous Series in the Chaoxian County area. |
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