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

…本研究将解决以下问题：1)C/T边界高分辨率黑色页岩剖面中特定微量金属的富集程度及其与碳同位素位移及相关微古生物学和有机地球化学指标的时间变化关系；2)高分辨率主、次元素格局可能推断出的古环境和古海洋结果是什么？3)微量金属富集最有可能的来源是什么？是否有热液贡献的迹象？4)主要元素模式是否提供了陆源碎屑物质源区（旋回？）不同风化条件的信息？5) Demerara隆起C/T黑色页岩中微量金属富集程度与其他环境和现代富oc沉积类似物相比如何？6) C/T黑色页岩中微量金属富集对全球微量金属循环和预算有何意义？

... 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?