1) Mid-Proterozoic-Triassic
中元古代-三叠纪
2) Mesoproterozoic Jixianian
中元古代蓟县纪
1.
Their geologic age is Mesoproterozoic Jixianian.
本文论述了江南造山带东段浅变质岩系发现的微古植物化石(计有27属40种)和它的时代意义,分析研究了西村组优势属为 Leiominuscula,Leiofusa,Asperatopsophosphaera,Germinosphaera,Melanocyillum 等5属；昌溪组优势属为 Germinosphaera,Leiominuscula,Leiopsophosphaera,Triangumorpha,Leiofusa 等5属；厘定了西村组、昌溪组地质时代为中元古代蓟县纪,通过对比和论证,提出了伏川蛇绿岩套形成的下限地质年龄在913-963Ma,上限地质年龄在800Ma。
3) late Paleozoic and Triassic volcanic rocks
晚古生代和三叠纪火山岩
4) Paleo-Mesoproterozoic
古-中元古代
1.
Sm and Nd isotopic geochemistry of Paleo-Mesoproterozoic meta-basic volcanics from Middle Hainan,China;
琼中古-中元古代变质基性火山岩地球化学特征
2.
Chronology and geological implication of the Paleo-Mesoproterozoic alkaline-rich intrusions belt from the northern part in the North China Craton.;
华北克拉通北部地区古-中元古代富碱侵入岩年代学及意义
5) Mesoproterozoic
[,mesəu'prɔtərə'zəuik]
中元古代
1.
The Fabric Characteristics and Origin of the Mesoproterozoic Pyritic Stromatolite from the Gaobanhe Deposits, East Hebei Province;
冀东高板河中元古代硫铁矿叠层石结构特征及其成因
2.
Third Member of Mesoproterozoic Gaoyuzhuang Formation at Qiangou Section in Yanqing County of Beijing:a typically non-stromatolitic carbonate succession of the Precambrian;
北京延庆千沟中元古代高于庄组第三段:一个典型的前寒武纪非叠层石碳酸盐岩沉积序列
3.
Glauconites formed in the high-energy shallow-marine environment of the late Mesoproterozoic:a case study from Tieling Formation at Jixian section in Tianjin,North China;
中元古代晚期浅海高能沉积环境中的海绿石:以天津蓟县剖面铁岭组为例
6) mid-Proterozoic
中元古代
1.
They formed in Mid-Proterozoic period with zircon SHRIMP U-Pb age of 1 343 Ma±30 Ma.
东昆仑万保沟群火山岩(Pt2w)为一套溢流相的基性火山岩夹少量的碳酸盐岩-硅质岩、泥质岩,形成时代为中元古代(Pt2),其玄武岩的锆石SHRIMP U-Pb谐和年龄为1343 Ma±30 Ma。
2.
According to field investigation,the Yingfeng rapakivi granite is formed in mid-Proterozoic and located between shear belts as a lentiform in the structural belt of north margin of Qaidam basin.
野外调查表明,鹰峰环斑花岗岩体形成于中元古代,位于柴北缘构造带,呈透镜状夹持在剪切带间。
3.
We make conclusion that a rift-limited ocean basin had been developed on the basis of the Yangtze continental margin in the mid-Proterozoic accompanying the extension.
有关中元古界碧口岩群的成岩构造环境及中元古代碧口地体构造属性长期存在争议。
补充资料：二叠纪三叠纪灭绝事件
二叠纪-三叠纪灭绝事件，是发生在大约2亿5,200万年前二叠纪和三叠纪交替时期的生物集群灭绝事件。
这一事件导致了70%的陆生物种和90%的海洋物种灭绝。古生代海洋中由海百合-腕足动物-苔藓虫组成的表生、固着生物群落迅速退出历史舞台，为中生代由现代软体动物-甲壳动物-硬骨鱼构成的内生、移动生物群落的崛起创造了条件。
有多种理论解释了灭绝的原因，包括：
撞击事件
板块构造
超新星
火山作用
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条