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

综合大洋钻探计划(IODP)探险320将从太平洋赤道时代断面(PEAT I)沿线的5个钻探地点获取数据。(紧随其后的第二次探险将在5月份进行：泥炭II)。这次探险的目的是为了更清楚地了解过去5500万年来地球的气候，并将恢复赤道太平洋下新生代沉积物的连续记录(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，也是可能发生的气候变化的重要驱动因素。我们知道，从极端温暖到冰川寒冷，全球气候发生了巨大变化，这些气候变化记录在赤道地带积累的富含生物的沉积物中。这项拟议的研究将侧重于每个地点沉积物中的物理和化学性质如何变化，以及我们如何最好地量化性质的可变性，进而将这些变化与参与考察的合作研究人员确定的气候变化指标联系起来。从海底回收的沉积物可能表现出类似的特征(即均质沉积物)，也可能非常不同(即非均质沉积物)。我们建议将成功用于描述复杂碳酸盐岩油气藏的技术应用于这些相对年轻的海洋沉积物，目的是为这次考察取得的广泛和重要的成果增加进一步的定量细节。成功实现这些目标还将使PEAT II上的科学家能够将类似的方法应用于他们的数据，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在全球气候系统发生重大变化的时候识别和描述新生代碳酸盐沉积物物理性质的旋回性和非均质性。

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.