Evaluation of cored carbonates (COREF): a transect in the tropical to subtropical realm in the Ryukyu Islands (Japan)

ICDP项目COREF的目标是恢复琉球群岛从热带到亚热带地区的不同环境中的第四纪礁复合沉积。两个主要目标是（1）跟踪珊瑚礁形成的北方和南方界限以及相关的碳酸盐系统，这些系统被认为分别迁移到较高和较低的纬度，以响应第四纪冰期和间冰期循环;（2）研究碳酸盐系统和珊瑚群落如何响应中更新世以前的高海平面和相关的温暖间隔。 检查纬度范围内不同的碳酸盐环境将提供有关这些环境如何应对过去温暖事件的信息，从而能够预测未来可能发生的变化作为持续全球变暖的结果。为了实现这些目标，选择了5个地点。从2013年11月开始，日本PI开始了取芯计划，迄今为止，已在拟议的5个地点中的3个（2、4和5）取芯11个孔。目前，约有500米的岩心未经处理储存在高知（日本）的储存库中。2016年7月，在波茨坦的OSG办公室举行的COREF项目状态研讨会上，决定在决定如何进行进一步钻探之前，必须对岩心进行科学评估。 在波茨坦的讨论之后，日本PI请求我们帮助处理岩心。我们很高兴这样做，因为它为我们提供了一个机会，加强日本和国际PI之间的合作，并更好地协调国际社会未来的工作。 因此，在这个为期一年的项目中，我们要求提供资金，以准备和描述岩心，将数据纳入综合社区发展项目的DIS系统，进行岩性和沉积学研究，并测试三维可视化对项目目标的适用性。这项简短的研究还将为如何规划钻探的最后步骤提供见解。

Objective of the ICDP Project COREF is to recover Quaternary reef-complex deposits in different settings across a transect from the tropical to subtropical realm in the Ryukyu Islands. Two major objectives are to (1) track the northern and southern limits of coral reef formation and associated carbonate systems, supposed to have migrated to higher and lower latitudes, respectively, responding to Quaternary glacial and interglacial cycles; (2) to examine how carbonate systems and coral communities have responded to previous high stands of sea-level and associated warm intervals of the mid-Pleistocene. Examining different carbonate settings across a latitudinal spectrum will provide information on how these responded to warmer episodes in the past, enabling to predict which future changes which may occur as a consequence of the ongoing global warming. To achieve these goals, 5 Sites have been choosen.Starting in November 2013, the Japanese PIs have started the coring program and have so far cored 11 Holes on three of the proposed five Sites (2, 4 and 5). At present, approximately 500 meters of cores are stored unprocessed at the repositories in Kochi (Japan). During a COREF project status workshop at the OSG Office in Potsdam, in July 2016, it was decided that the cores must be assessed scientifically before making a decision on to how to proceed with further drilling. Following the discussions in Potsdam, the Japanese PIs have requested our help to process the cores. We are very happy to do so, as it provides us with an opportunity to strengthen the cooperation between Japanese and international PIs and to better coordinate future work within the international community. Therefore, with this short 1-year project, we request funds to prepare and describe the cores, integrating the data in the DIS system of ICDP, to carry out a lithological and sedimentological study and to test the applicability of 3D visualization to the goals of the project. This short study will also provide insights on how to plan the final steps of the drilling.