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鄂尔多斯南缘奥陶纪生物礁及其沉积环境研究
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摘要
本文以鄂尔多斯南缘奥陶纪生物礁为研究对象,在充分吸收前人研究成果的基础上,实地踏勘野外剖面,收集相关探井资料,并借助地球化学方法对样品测试分析。系统研究了生物礁的分布范围、主要的造礁生物、附礁生物和岩石类型,明确了生物礁发育的沉积环境,分析了生物礁沉积微相及其发育演化,并用碳氧同位素、微量元素等方法进行了生物礁地球化学研究,在此基础上分析了鄂尔多斯南缘晚奥陶世生物礁发育的控制因素并总结了生物礁的成礁模式。
     鄂尔多斯南缘生物礁主要分布在渭河以北东起富平、.西至陇县长约250km的范围内,均为晚奥陶世生物礁,在对富平小园-将军山、耀县桃曲坡、淳化铁瓦殿、泾阳徐家山、永寿好峙河以及礼泉东庄生物礁剖面实地踏勘的基础上,认为造礁生物主要由珊瑚、藻类、层孔虫组成;附礁生物主要有头足类、腕足类、腹足类、海百合、三叶虫、牙形石类等;组成生物礁的岩石类型主要有骨架岩、障积岩、粘结岩、内碎屑灰岩、生物碎屑灰岩、藻屑灰岩以及白云岩。生物礁沉积微相主要划分为礁基底、礁核、礁盖层,大部分没有礁核礁翼或者礁前礁后的分别,仅在永寿好峙河生物礁和礼泉东庄生物礁中可划分出礁翼微相。生物礁的发育演化过程多有间断,不连续,生物礁发育具有多层性。
     晚奥陶世鄂尔多斯南缘主要发育开阔海台地相、台地边缘礁滩相、台地前缘斜坡相以及深水斜坡-海槽相。研究区生物礁即发育在台地边缘礁滩相之中。
     晚奥陶世生物礁大量发育,生物大量吸收轻碳同位素12C,重碳同位素13C在水体中富集而使得晚奥陶世碳酸盐岩呈现δ13C的高值,生物含量丰富的礁相碳酸盐岩δ13C值低于非礁相碳酸盐岩;生物礁发育时海水盐度与此前相比并没有明显的变化,说明盐度并不是本区生物礁发育的主要控制因素;晚奥陶世δ18O值高于早中奥陶世,海水温度有一定程度的增高,温暖的海水更适宜生物的生存,对生物礁的发育有一定的促进作用;锶含量的高值与生物作用关系密切,晚奥陶世研究区大量发育的生物使得礁相灰岩的锶含量明显增高。
     鄂尔多斯南缘晚奥陶世生物礁发育主要受到了大地构造条件、古气候条件、造礁生物、基底条件、同生断裂活动、相对海平面变化、海底地形条件、水动力条件以及海水性质等因素的控制,在此基础上形成了自己的成礁模式。
The object of this study is the reef of the Ordovician in the southern margin of Ordos. On the basis of absorbing the outcomes of predecessors, scouting field sections and collecting data of relevant wells, testing the samples with geochemistry methods. The distribution range of reef, the reef building organisms,. the reef attaching organisms and the rock types are defined, the depositional environment of reef is studied, the microfacies and evolution of the reef are analyzed, what's more, the trace element and isotope of C and O are applied to analysis the reef. In the end, the control factors why the reef developed are analyzed and the formative pattern of the reef is summarized.
     The reef of the Ordovician in the southern margin of Ordos is distributed to the north of Weihe, east to Fuping, west to Longxian, the extentis about 250 kilometres. On the basis of scouting field sections of Fuping Xiaoyuan-JiangJunshan, Yaoxian TaoQupo, Chunhua TieWadian, Jingyang XuJiashan, Yongshou HaoZhihe and Liquan Dongzhuang, the conclusions are made that the reef building organisms are made up of coral, algae and stromatopora, the reef attaching organisms contain cephalopod, brachiopod, gastropod, crinoid, trilobite, and conodontophoridia, the rock types which make up the reef consist of framestone, bafflestone, bindstone, intralimestone, algal limestone and dolomite. The microfacies consist of reef base,reef core and reef cover, most reefs have not the distinguish between reef core and reef flank, forereef and backreef, the Yongshou HaoZhihe and Liquan Dongzhuang are where the reef flank appears. The process of evolution is discontinuous, the reefs are made up of many layers.
     In late Ordovician, the sedimentary facies of the southern margin of Ordos can be divided into open marine platform facies, platform edge reef flat facies, platform front clinothem facies and deep water clinothem-trench facies, the platform edge reef flat facies is where the reef developed.
     The organisms absorb the 12C largely, so, the waters consist of abundant 13C, which makes that theδ13C of carbonatite in late Ordovician is high, the 813C of reef carbonatite which contain abundant organisms is lower than the usual carbonatite. The salinity is not the main factor which influences the development of reef, because there is just a little variation when reef occurs. In late Ordovician, theδ18 has a little rise, which accounts for the temperature has a little rise. The warm water is more appropriate for organisms to live, which can promote the development of reef. The content of Sr is related to organism closely, it is the abundant organisms that make the content of Sr has a rise obviously.
     The factors which affect the development of reef in the southern margin of Ordos include tectonic structure, geologic climate, reef building organism, foundation conditions, contemporaneous fault, sea-level change, bottom configuration, hydrodynamic force and sea water nature. Finally, we summarize the formative pattern of the reef of the late Ordovician in the southern margin of Ordos.
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