| 南祁连清水沟一带奥陶纪盐池湾组岩石地层特征 |
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| 引用本文： | 张国英.南祁连清水沟一带奥陶纪盐池湾组岩石地层特征[J].西北地质,2004,37(1):6-12. |
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| 作者姓名： | 张国英 |
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| 作者单位： | 甘肃省地勘局第四地质矿产勘查院,甘肃,酒泉,735000 |
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| 基金项目： | 地矿部区域地质调查项目"扣克乌送达坂幅、月牙湖幅1∶5万区域地质调查"部分成果(62970202) |
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| 摘 要： | 在南祁连清水沟一带,盐池湾组呈北西西-南东东向展布．为一套深灰绿色细碎屑浊积岩系夹深海泥岩。主要岩性有变泥质粉砂岩、长石石英杂砂岩、细砂质长石石英粉砂岩、长石杂砂岩、绢云石英千枚岩等。岩石中粒序层理、交错层理不太发育,指示该组岩层层序是倒转的．即北老南新。该组发育不完整鲍玛层序,有3种类型．即ABCD型、韵律型和均一型。综合研究盐池湾组的宏观岩性特征、基本层序、沉积构造、浊流沉积岩石学特征、粒度曲线特征、微量元素、稀土元素指数等蕴藏在沉积岩中的各种地质信息,指示该组形成于次深海至深海相浊流沉积中端相和远端相区。浊积岩与深海泥岩以不同比例重复组合,构成复理石沉积建造。
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| 关 键 词： | 南祁连 清水沟 盐池湾组 浊积岩 次深海-深海相 奥陶纪 |
| 文章编号： | 1009-6248(2004)01-0006-07 |
Characteristics of the petrology and stratigraphy in the Qingshuigou of South Qilian mountains |
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| ZHANG Guo-ying.Characteristics of the petrology and stratigraphy in the Qingshuigou of South Qilian mountains[J].Northwestern Geology,2004,37(1):6-12. |
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| Authors: | ZHANG Guo-ying |
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| Abstract: | The Ordovician Yanchiwan Formation spreads out with the NWW-SEE direction in the belt of Qingshuigou in South Qilian mountains.It is made up with a set of deep celadon fine clastic turdidite sequence and abyssal mudstone that form the flyth formation by combining with the different proportion repetion eath other.Its main rocks is the metamorphic pelitic siltstone, the feldspathic quartz wacke,the fine sandial feldspathic quartz siltstone,the feldspathic wacke and the sericite quartz phyllite etc.It is not developing that the middle grain sequence lamination and the crossing lamination that indicate this formation's sequence is reversal and the northern rocks is older than the southern rocks.The Bouma Sequence is not integrated in this formation,it has three types:ABDE type,rhythmic one and simple one.By research kinds of information in Yanchiwan Formation,such as the macro petrological characteristics,basic sequence,sedimentary structure,turbidity petrological characteristics grain size curve's characteristics,the strace element and the rare-earth element's index, authors consider that this formation formed at the middle for facies and carry for facies of the bathyal-abyssal facies's turbidity current sedimentary. |
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| Keywords: | South Qilian mountains Qingshuigou Yanchiwan Formation turdidite bathyal-abyssal facies |
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