Physical Properties of Cenozoic carbonate sediments: determining cyclicity & heterogeneity from core and downhole data (IODP Exp. 320)

综合大洋钻探方案第320次考察将从太平洋赤道年龄断面（PEAT I）沿线沿着的5个钻探点获取数据。（第二次探险将于5月紧随其后：PEAT II）。这次考察的目的是更清楚地了解过去5500万年来地球的气候，并将恢复赤道太平洋下沉积物的连续新生代记录（从6550万年前到现在）。赤道太平洋被认为是维持目前全球气候的主要组成部分，也是可能发生气候变化的重要驱动力。我们知道，全球气候从极端温暖到冰川寒冷发生了巨大变化，这些气候变化记录在赤道地区积累的富含生物的沉积物中。这项拟议的研究将侧重于沉积物内的物理和化学性质如何在每个地点变化，以及我们如何最好地量化性质的变化，并反过来将这些变化与参与探险的共同研究人员确定的气候变化代理相关联。从海底回收的沉积物可能具有类似的特性（即均质沉积物），也可能差异很大（即非均质沉积物）。我们建议将成功用于表征复杂碳酸盐油气藏的技术应用于这些相对年轻的海洋沉积物，目的是为考察的广泛和重要结果提供进一步的定量细节。成功实现这些目标也将使PEAT II的科学家能够将类似的方法应用于他们的数据，以整合两次探险的结果。因此，我们在这个项目中的总体目标是识别和解释在全球气候系统发生重大变化时新生代碳酸盐沉积物物理性质的周期性和非均匀性。

The Integrated Ocean Drilling Programme (IODP) Expedition 320 will acquire data from 5 drill sites along the Pacific Equatorial Age Transect (PEAT I). (A second expedition will follow immediately afterward in May: PEAT II). The expeditions aim to provide a clearer understanding of Earth's climate over the past 55 million years and will recover a continuous Cenozoic record (from 65.5 million years ago to the present) of sediments beneath the equatorial Pacific Ocean. The equatorial Pacific is believed to be a major component in maintaining present global climates, and a significant driver in possible climate change. We know that global climate has varied dramatically from extreme warmth to glacial cold and these climate variations are recorded in the biogenic-rich sediments that accumulated in the equatorial zone. This proposed research will focus on how the physical and chemical properties within the sediments vary at each of the sites, and how we can best quantify the variability of properties, and in turn relate the changes to climate change proxies identified by co-researchers participating in the Expedition. Sediments recovered from the seafloor may demonstrate similar characteristics (i.e. homogeneous sediments) or may be very variable (i.e. heterogeneous sediments). We propose to bring techniques used successfully in characterising complex carbonate oil and gas reservoirs to bear on these relatively young ocean sediments, with the aim of adding further quantitative detail to the wide ranging and important results from the expeditions. Success in achieving these objectives will also enable scientists on PEAT II to apply similar approaches to their data in integrating the results of both expeditions. Thus our overall aims in this project are to identify and characterise the cyclicity and heterogeneity in the physical properties of Cenozoic carbonate sediments at a time of major change in global climatic systems.