Ichnology and Sedimentology of Glaucony Greensands: Paleoenvironmental, Sequence Stratigraphic and Paleoclimatic Implications

题目：绿海藓技术与沉积学；摘要本项目通过对海绿石沉积（“海绿石”）的古生态、技术、沉积学和古环境等方面的研究，揭示其在海平面动力学、古气候、矿物自生作用、海洋环境和海洋环境等方面的重要意义。海底地球化学与层序地层学。该项目将采用实地观察和实验室分析。该方法将通过研究与促进海绿石（海绿石和其他绿色海相粘土矿物）形成的动态沉积学和海底地球化学环境有关的痕量化石组合和沉积构造（生物成因沉积构造），将技术与沉积矿物学结合起来。本研究的主要科学目标包括：(a)在寒武纪至第三纪的绿色海洋产状谱中确定绿色海洋颗粒的精确矿物学；(b)在每个研究地点的地层和层理表面上识别相关的痕迹化石和特征的地层结构和岩相；(c)详细描述了层序和准层序内绿地相中痕量化石、沉积结构和沉积物类型的垂直变化；(d)综合地质柱不同部分的不同相绿地内的技术和沉积学观测；(e)在层序地层学和海平面动力学的背景下解释这些发现，特别是与被动边缘浓缩剖面有关的发现；(f)澄清过去可能形成海绿石的古气候制度。为了调查绿化带的广泛分布，并试图辨别它们的矿物学、沉积学和技术方面的一些共同点，该项目将对犹他州、怀俄明州、德克萨斯州、阿拉巴马州、威斯康星州和西班牙东部的各种研究地点进行调查。一名研究生研究助理和一名本科生研究助理将协助私家侦探进行实地工作和实验室工作。

Title: Ichnology and Sedimentology of Glaucony Greensands: Paleoenvironmental, Sequence Stratigraphic and Paleoclimatic ImplicationsAllan A. EkdaleUniversity of UtahEAR-1052661ABSTRACT This is a project to investigate trace fossil-bearing greensand deposits in different parts of the geologic column in order to interpret the significance of green marine sedimentary deposits ("glaucony") in terms of paleoecology, ichnology, sedimentology, and paleoenvironments, with the potential implications for sea level dynamics, paleoclimates, mineral authigenesis, sea floor geochemistry and sequence stratigraphy. The project will employ both field observations and laboratory analyses. The approach will be an unusual coupling of ichnology with sedimentary mineralogy by examining trace fossil associations and ichnofabrics (biogenic sedimentary fabrics) in relation to the dynamic sedimentologic and sea floor geochemical environment that promoted the formation of glaucony (glauconite and other green marine clay minerals). The principal scientific objectives of this research include the following: (a) to determine the precise mineralogy of the green marine grains in a spectrum of greensand occurrences of Cambrian through Tertiary age; (b) to identify the associated trace fossils and characteristic ichnofabrics and ichnofacies within beds and on bedding surfaces at each study site; (c) to detail the vertical changes in trace fossils, ichnofabrics and sediment types in the greensand facies within beds and within parasequences; (d) to integrate ichnologic and sedimentologic observations within the different facies of greensands from various parts of the geologic column; (e) to interpret the findings in the context of sequence stratigraphy and sea level dynamics, specifically in relation to passive-margin condensed sections; and (f) to clarify the paleoclimate regime(s) in which glaucony may have formed in the past. In order to investigate a broad spectrum of greensand occurrences and attempt to discern some common denominators about their mineralogy, sedimentology and ichnology, a variety of study sites in Utah, Wyoming, Texas, Alabama Wisconsin and eastern Spain will be investigated in this project. A graduate research assistant and undergraduate research assistant will assist the P.I. in both field work and lab work.