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古元古代大氧化事件(GOE)前后海洋环境的变化: 来自华北条带状铁建造(BIF)岩相学和地球化学的证据*
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张连昌1,2, 兰彩云3, 王长乐1,2, 彭自栋1,2, 佟小雪1,2, 李文君1,2, 董志国1,2 |
Changes of oceanic environment before and after the Paleoproterozoic Great Oxidation Event(GOE): Evidence from petrography and geochemistry of banded iron formation(BIF)from the North China Craton
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Zhang Lian-Chan 1,2, Lan Cai-Yun 3, Wang Chang-Le 1,2, Peng Zi-Dong 1,2, Tong Xiao-Xue 1,2, Li Wen-Jun 1,2, Dong Zhi-Guo 1,2
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山西吕梁袁家村古元古代条带状铁建造岩相特征 A—赤铁矿(Hem)呈细小的豆粒状沿条带分布,粒径1~2 mm;B—条带状石英赤铁矿,条带宽0.05~7 mm,条带平直连续;C—富硅条带中的细条纹赤铁矿,宽约0.05 mm(反射光);D—富铁条带与富硅条带接触较截然,富硅条带中散布着粉尘状的赤铁矿,粒径约0.002 mm(反射光);E—细小的赤铁矿颗粒或分布在石英颗粒的三联点上,或被石英颗粒包裹(正交光);F—赤铁矿因区域变质作用重结晶,形成镜铁矿(反射光) |
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