Carbon Isotope studies of Phanerozoic Mass Extinction Events

海相灰岩碳同位素研究揭示了有机碳与碳酸盐碳沉积比例的变化；13C剖面与大灭绝事件和海平面变化相关。在建议的更新期内，我们将完成晚古生代和二叠纪/三叠纪边界的碳同位素剖面表征。在从阿尔卑斯山到中国的特提斯海经典剖面中，通过二叠纪/三叠纪边界的24个剖面序列将完成并发表。1986年9月至10月，在奥地利Carnic Alps Gartnerkofel的一个关键剖面上，通过二叠纪/三叠纪边界超过300米的岩心，将由12名专家组成的联盟进行跨学科研究。我们和其他人在晚宾夕法尼亚世发现的晚古生代碳同位素异常的早期表现，将在美国西部的新收集中得到证实。将考虑与灭绝事件有关的碳循环、海平面和其他地质参数变化的地球物理和地球化学模型。

Carbon isotope studies of marine limestones detect shifts in the depositional ratio of organic carbon to carbonate carbon; profiles of 13C are correlative with major mass extinction events and changes in sea level. During the proposed renewal period we will complete characterization of the carbon isotope profile through the Late Paleozoic and the Permian/Triassic boundary. A sequence of two dozen profiles through the Permian/Triassic boundary in classic sections of the Tethys Sea, from the Alps to China, will be completed and published. A core of over 300 m through the Permian/Triassic boundary in a critical section at Gartnerkofel in the Carnic Alps of Austria, taken in September- October, 1986, will be the subject of a cross-disciplinary study by a consortium of 12 specialists. The earlier manifestations of the Late Paleozoic carbon isotope anomaly, previously detected by us and others in the Late Pennsylvanian, will be confirmed by new collections in the western USA. Geophysical and geochemical models for shifts in the carbon cycle, sea level and other geological parameters will be considered in relation to extinction events.