Terminal Ordovician mass extinction and its relationship to iridium and carbon isotope anomalies 奥陶系与志留系界线处生物绝灭事件及其与铱和碳同位素异常的关系
Across the F F boundary there are three nickel iridium moderate anomaly beds, which are also enriched in chalcophile elements, and also accompanied with the carbon isotope negative anomalies and microtektites. 在F-F界线有3个Ni-Ir异常层,该异常层同时也富含亲铜元素,并伴有碳同位素负异常以及微玻陨石。