白垩纪中期(~120-90 Ma)温室地球期间发生了一系列重大地质事件，如大洋缺氧事件、大规模火山活动(表现为大火成岩省）、地磁场超静磁期等，它们之间被认为存在一定的内在关联。然而，由于这些事件的年代不易精确确定，以致对它们之间的相位关系及耦合机制长期以来备受争议。本项目在已精确厘定出赛诺曼末期(C/T界线)大洋缺氧事件2 (OAE2)层位、建立轨道尺度年代标尺基础上，拟对西藏南部定日地区OAE2附近地层开展地磁场相对古强度和锇同位素(187Os/188Os)研究。相对古强度研究用于识别发生于超静磁期内的地磁场强度异常Q3(~95 Ma)，锇同位素研究在于示踪和厘定发生于~95.0 Ma的火山活动。通过相对古强度及锇同位素研究，本项目旨在查明东特提斯域（藏南）OAE2与火山活动、地磁场异常之间的相位关系及可能的耦合关联，进而为探究白垩纪中期地球系统各圈层之间的相互作用提供重要的证据和线索。

The mid-Cretaceous (~120-90Ma) greenhouse world is characterized by the occurrence of a number of anomalous geologic events including oceanic anoxic events (OAEs), intensified volcanism (large igneous provinces, LIPs), and the Cretaceous normal superchron (CNS). It is generally believed that these events were coupled. However, the phasing relationship and detailed coupling mechanism among these events remain poorly understood due to the lack of precise chronology of these events. Here I propose to carry out a paleomagnetic relative paleointensity study and an Os isotope (187Os/188Os) stratigraphic study in Tingri, southern Tibet where a high-resolution OAE2 record that is also constrained with an orbital timescale has recently been obtained. The relative paleointensity study is designed to delineate the geomagnetic field intensity anomaly Q3 (~95 Ma) within the CNS. The Os isotope stratigraphic study is designed to identify and define the interval of intense volcanism around ~95.0 Ma. Together with the existing orbital timescale and the high-resolution OAE2 record, this study aims at determining the phasing relationship among OAE2, submarine volcanism, and the geomagnetic field anomaly (Q3) in the eastern Tethys realm (southern Tibet), and further investigates the detailed coupling mechanism among these events. This study shall shed new light on the interplay among different spheres of the Earth system.