Facies Generation, Transformation and Destruction by Repetitive Excavation and Infilling of Burrow Networks

洞穴网络的重复挖掘和填充导致相的生成、转变和破坏

• 批准号: 8917315
• 负责人: Harold Wanless
• 金额: $ 6万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917315&HistoricalAwards=false
• 关键词: Facies; Generation; Transformation; Destruction; Repetitive

Excavating burrowers exert an overwhelming influence on many sedimentary sequences throughout the Phanerozoic. Burrow excavation processes coupled with subsequent storm infilling of open burrow networks results in (1) obliteration or transformation of precursor sequences, (2) subsurface generation of depositional facies and stratification and (3) production of preserved depositional fabrics and faunal assemblages that are not a direct reflection of either precursor facies or the surficial depositional conditions, textures and fabrics. Analysis of affected sedimentary sequences using traditional stratigraphic, sedimentologic and paleoecologic principles will produce misleading interpretations of paleoenvironmental conditions and sequnce evolution. This project will characterize the nature, extent and rate of modification in affected modern sequences and develop and test criteria for recognition and reevaluation of affected ancient sedimentary sequences. The carbonate shelf, lagoonal and mudbank environments of south Florida will serve as study areas for the modern portion of this research program. Application to ancient sequences will use limestone lagoonal, shelf, mudbank, and mound deposits of the Lower Cretaceous of Texas, Pennsylvanian of Kansas and the Mississippian of New Mexico. Results will affect the environmental interpretation of ancient rock sequences and the assessment of their hydrocarbon potential.

挖掘穴居者对显生宙的许多沉积序列产生了压倒性的影响。坑道开挖过程加上随后的露天坑道网络的风暴填筑导致：(1)前体序列的湮没或转变；(2)沉积相和地层的地下生成；(3)保存下来的沉积组构和动物组合的产生，这些组构和动物组合既不能直接反映前相，也不能直接反映地表沉积条件、结构和组构。用传统的地层学、沉积学和古生态学原理分析受影响的沉积层序，会对古环境条件和层序演化产生误解。该项目将描述受影响的现代层序的性质、程度和变化速度，并制定和测试识别和重新评价受影响的古代沉积层序的标准。南佛罗里达的碳酸盐陆架、泻湖和泥滩环境将作为本研究项目现代部分的研究区域。应用于古序列将使用石灰石泻湖，陆架，泥滩，丘沉积下白垩纪的德克萨斯州，宾夕法尼亚州的堪萨斯州和新墨西哥州的密西西比。其结果将影响古岩层序的环境解释和油气潜力评价。