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- Middle Ordovician System 中奥陶统
- The major structure in the area is the NE-NNE folded belt consisting of Banxi Group of the Middle Proterozoic era to the Ordovician system of the Early Paleozoic era. 由新元古界板溪群至下古生界奥陶系所构成的NE-NNE向褶皱带为区内主体构造；
- There exist different opinions about hydrocarbon generation capacity of the middle Ordovician carbonatite on the south slope of Huimin sag. 关于惠民凹陷南坡中奥陶统海相海相碳酸盐岩的生烃能力,前人有不同的认识。
- Fractures and caverns are the main spaces of carbonate reservoirs of the Ordovician system in Tahe Oilfield. 裂缝和溶蚀孔洞是塔河油田奥陶系碳酸盐岩主要的储集空间。
- The main water source is fracture-karst water in Middle Ordovician carbonate rocks. 主要的供水水源为中奥陶统碳酸盐类岩石中的裂隙-喀斯特水。
- This paper is a continuation of the papers on lithofacies palaeogeography of the Early, Middle and Late Cambrian and the Early and Middle Ordovician. 摘要本文是笔者等的中国早、中、晚寒武世和早、中奥陶世岩相古地理诸文的继续。
- The shoal and patch reef sub-facies in territorial seawater shallowing open platform facies are developed in Middle Ordovician Yijianfang Formation. 中奥陶统一间房组沉积时期为区域性的海水变浅的开阔台地浅滩夹点礁沉积。
- The ore beds are in the Middle Ordovician limestone. It is a water abundant mine with an average drainage of 61200 m 3/d, but the unpolluted drainage has not be utilized. 矿层位于中奥陶统的石灰岩中，为一多年平均日排水量达6.;12万m3/d的大水矿山。
- Take the huge unconformity in the bottom of Middle Ordovician as the boundary,the sequences could be classified into Sauk and Tippecanoe suppersequence sets. 以中奥陶统底部的巨大不整合为界，可以划分出Sauk和Tippecanoe两个超层序组。
- The Xiangshan Group is underlain conformably by the Middle Ordovician Miboshan Group and is in turn ovelain unconformably by the Silurian,Devonian and Carboniferous. 香山群与下伏中奥陶统来钵山组关系为整合接触，不整合伏于志留系、泥盆系、石炭系之下。
- The smithsonite deposits of longshansangzhi lead-zine zone in northwestern Hunan are located in Haozitue group of upper Cambrian system and bottom party of Nanjianguan fromation of lower Ordovician system. 湖南西北部龙山 -桑植铅锌矿带的菱锌矿床 ,主要赋存于寒武系上统耗子沱群第 3段和奥陶系下统南津关组底部的“硅化体”与纯灰岩接触面附近 ,为以菱锌矿为主、异极矿其次的氧化锌矿床。
- LI R H.Trace fossils and ichnofacies of Middle Ordovician Gongwusu Formation, Zhuozishan, Inner Mongolia [J].Acta Palaeontologica Sinica, 1993, 32(1): 88-104. [9]李日辉.;内蒙古桌子山地区中奥陶世公乌素组的遗迹化石及遗迹相[J]
- Sedimentary environment was broad and flat near shore littoral erosion plain,the ore is located above Majiagou Formation,Middle Ordovician Series,bedding is not well developed. 铝土矿与其围岩有较大的电性差异,特别是铝土矿与其标志层奥陶系灰岩侵蚀面的电阻率值相差较大,达数千欧姆米乃至数万欧姆米。
- The salts are continental source and come from the Cambrian and Ordovician systems of the surrounding uplifts. 其盐源主要是陆源，由周围凸起的寒武、奥陶系提供。
- The paper deals microscopically and macroscopically with the characteristics of fissure karst in the Middle Ordovician carbonate rocks in the West Mountain of Taiyuan, and with the groundwater natural resources. 本文从岩石微观上、宏观上研究了太原西山中奥陶系碳酸盐岩的裂隙岩溶特征,并就地下水天然资源作了研究。
- Hydrocarbon source rocks in North Tarim Basin can be divided into three petroleum systems such as Cambrian Ordovician system,Tertiary Jurassic system and Carboniferous Permian system. 依据塔北地区烃源岩及勘探状况 ,可划分出寒武 +奥陶系、三叠 +侏罗系及石炭 +二叠系 3套源岩含油气系统 ,其中 ,前两套为已知含油气系统 ,后者为推测含油气系统。
- From the late Middle Ordovician to the end of Ordovician, the cephalopods, gastropods and corals in the Erlangping trough, and the conodonts, coral, brachiopods, cephalopods as well as trilobites in the Xichuan shelf were from the North China Province. 在中奥陶世晚期至奥陶纪末，二郎坪海槽的腹足类、头足类和珊瑚与浙川陆棚的牙形石、珊瑚、腕足类、头足类和三叶虫均属华北生物省。
- the Cryogenian System to Ordovician System 南华系-奥陶系
- The Middle Ordovician high - quality Mn ore deposit develops in the five synsedimentary fault depressions in the central Hunan Province, whose environment is of subabyssal, anoxic and insufficient compensation. 湘中中奥陶世优质锰矿沉积于桃江成锰沉积盆地的五条同沉积断陷槽内,为次深海缺氧欠补偿沉积环境。
- Based on the geotectonic background of the southern margin of the North China platform of Middle Ordovician, the sedimentary environments and sedimentary patterns of Pingliang Formation are analyzed. 从中奥陶世华北地台南缘大地构造背景出发，分析了鄂尔多斯盆地南缘中奥陶统平凉组的沉积环境和沉积模式。
