High-resolution geochemical records of black shale deposition in the tropical Cretaceous Atlantic Ocean (Demerara Rise, ODP Leg 207)

...本建议将解决以下问题：1）在C/T边界的高分辨率黑色页岩剖面中发现的特定微量金属富集到何种程度，它们如何随时间变化，与碳同位素位移和相关的微体古生物和有机地球化学代用指标有关？2)从高分辨率的主元素和次元素分布图中可以推断出什么样的古环境和古海洋学结果？3)微量金属富集的最可能来源是什么？是否有热液作用的迹象？4)主成分模式是否提供（循环？）陆源碎屑物质源区的不同风化条件？5)德梅拉拉隆起的C/T黑色页岩中的微量金属富集与其他环境和富含OC的沉积物的现代类似物相比如何？6)C/T黑色页岩中微量金属富集与全球微量金属循环和收支的关系有何重要意义？

... The following questions will be addressed by this proposal: 1) To what degree are specific trace metals found enriched in high-resolution black shale profiles from the C/T boundary and how do they vary in time in relation to the carbon isotope shift and correlative micropaleontological and organic geochemical proxies? 2) What are the paleoenvironmental and paleoceanographic consequences that may be deduced from high-resolution major and minor element patterns? 3) What is the most likely source for trace metal enrichments and are there any indications for a hydrothermal contribution? 4) Do major element patterns provide information on (cyclic?) varying weathering conditions in the source areas of terrigenous detrital material? 5) How do trace metal enrichments in C/T black shales from Demerara Rise compare with those from other settings and modern analogues of OC-rich sedimentation? 6) What is the significance of trace metal enrichments in C/T black shales in relation to global trace metal cycles and budgets?