海相油气地质投稿系统 关键词： 奥陶系；碳酸盐岩；油气成藏；成藏模式；油气物性；塔中地区 [gap=1808]Keywords: Ordovician; Carbonate rock; Hydrocarbon Accumulation; Hydrocarbon Distribution; Tazhong ar..
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Middle Ordovician 中奥陶世 ; 中奥陶统 ; 奥陶系中统
Cambro-ordovician 寒武 ; 奥陶纪
Lower Ordovician 早奥陶世 ; 下奥陶纪 ; 下奥陶统
premedial Ordovician 中奥陶世前的
Late Ordovician 晚奥陶纪 ; 晚奥陶世
upper ordovician 晚奥陶世 ; 上奥陶统
The strata in upper Sinian, late Proterozoic Eras and cambine system, Ordovician, Silurian ,early palaeozoic and Devonian ,late palaeozoic outcrop in In this area. The main strata are Sedimentary superficial metamorphic fine Clastic Rock with carbonate rocks .
区内主要出露有早古生代寒武系、奥陶系、志留系及晚古生代泥盆系,发育一套浅变质细碎屑岩与碳酸盐岩沉积建造。
参考来源 - 南秦岭构造带旬阳—神河一带地质构造特征Mid-Ordovician limestone may also provide smallamounts of aluminum.
故认为,铝土矿的物源主要来自前寒武纪变质岩及花岗岩,奥陶纪石灰岩可能提供少量铝质。
参考来源 - 华北式(G层)铝土矿中的锆石标型研究·2,447,543篇论文数据，部分数据来源于NoteExpress
同义词： Ordovician period
以上来源于: WordNet
ADJ of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished (古生代第二期)奥陶纪的; 属于(古生代第二期)奥陶纪的
N the Ordovician period or rock system 奥陶纪时期; 奥陶纪岩石系统
The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life.
美国西部干燥的山脉包含了距今4.4亿至5.1亿年前的奥陶纪岩石，其中充斥着热带海洋生物生存的迹象。
The Ordovician ice age happened 444 million years ago, and records have suggested that CO2 levels were relatively high then.
奥陶纪冰河时期发生在4.44亿年前，有记录表明其CO2含量较高。
However, some researchers believe that a GRB was responsible for the Ordovician mass extinction approximately 450 million years ago.
然而，有一些研究者认为，大约4.5亿年前的奥陶纪大灭绝是伽马射线爆引起的。
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