Calcite Diagenesis: Seafloor and Laboratory Studies

从河流流入的碱度与海底沉积物中方解石的埋藏损失之间的海洋平衡可以确定冰期-间冰期时间尺度上海洋表面的二氧化碳分压，从而确定大气的二氧化碳分压。影响的大小对驱动碳酸钙溶解的因素和海底溶解的机制非常敏感。在这项研究中，首席研究员将与其他几位海洋碳酸盐专家合作，试图帮助解决该领域的一个主要问题：通过呼吸过程和简单溶解/沉淀溶解方解石的动力学和相对重要性。通过跟踪海底生物原位室的氧气、pH值和碳酸盐测量，并通过方解石沉淀/溶解动力学的备用实验室研究，首席研究员预计他将能够通过消除迄今为止进行的类似研究中固有的不确定性来解决这个问题。

ABSTRACTOCE-9810928The oceanic balance between the influx of alkalinity from rivers and the loss by burial of calcite in seafloor sediments can determine the partial pressure of carbon dioxide of the surface ocean, and thus of the atmosphere, on glacial-interglacial time scales. The magnitude of the effect is very sensitive to the factors that drive the dissolution of calcium carbonate and the mechanisms of dissolution on the sea floor. In this study the principal investigator would collaborate with several other marine carbonate experts in an attempt to help resolve a major question in this field: the kinetics and relative importance of calcite dissolution by respiratory processes and by simple dissolution/precipitation. By following oxygen, pH, and carbonate measurements in in-situ benthic chambers and through back-up laboratory studies of calcite precipitation/dissolution kinetics, the principal investigator anticipates that he will be able to address this problem by eliminating uncertainties inherent in similar studies conducted to date.