Collaborative Research: The Paleocene-Eocene Thermal Maximum in the Southern Ocean: Middle Bathyal Constraints from ODP Sites 689 (Atlantic Sector) and 738 (Indian Sector)

PIS将进行一项综合的化学地层学、岩石地层学和生态地层学研究，在大西洋、太平洋和更深的南大洋的早期研究的背景下，考虑古新世-始新世热峰值的开始和历史。PI为南大洋的两个地点生成了大量碳酸盐稳定同位素记录，证明了这两个地点跨越古新世-始新世界线的地层完整性。他们提议测试三个问题，并将他们的发现与其他PETM记录联系起来：1)PETM事件的发生速度是多少，具体地说，触发PETM事件的假想甲烷释放是否在大气中氧化并逐渐向下混合到海洋中？2)碳酸盐饱和度是如何通过该断面发生变化的，是否有多次甲烷注入？以及3)浮游生物和海底生态系统如何通过水文和浮游-海底耦合的变化对事件做出反应？将738和689站点的结果添加到其他专注于PETM高分辨率研究的深度断面上，将为南大洋较浅的深度提供新的信息。

Schellenberg/KellyAbstractThe PIs will carry out an integrated chemostratigraphic, lithostratigraphic and ecostratigraphic study that will consider the onset and history of the Paleocene-Eocene Thermal Maximum in the context of earlier studies from the Atlantic, Pacific, and deeper Southern Ocean. The PIs have generated a bulk carbonate stable isotope record for two Southern Ocean sites that demonstrates stratigraphic completeness across the Paleocene-Eocene boundary at both sites. They propose to test three questions and relate their findings to other PETM records: 1) what was the rate of onset of the PETM and specifically, did the hypothesized methane release that triggered the PETM event oxidize in the atmosphere and progressively mix downward through the ocean?; 2) how did carbonate saturation change through the section and were there multiple methane injections?, and 3) how did the planktic and benthic ecosystems respond to the event by way of changes in hydrography and planktic-benthic coupling? The addition of Sites 738 and 689 results to other depth transects focused on high-resolution study of the PETM will provide new information for the shallower depths of the Southern Ocean.