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Cyclic Carbonates and Vail-Sequences on Carbonate Platforms:A Field and Modelling Study

碳酸盐岩平台上的环状碳酸盐和韦尔层序：现场和模拟研究

基本信息

批准号：
8816664
负责人：
James Read
金额：
$ 9.9万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1989
资助国家：
美国
起止时间：
1989-01-01 至 1991-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816664&HistoricalAwards=false
关键词：
Cyclic Carbonates Vail Sequences Carbonate

项目摘要

We will to log in detail, and test for evidence of cyclicity, classic stratigraphic sections in the Late Cambrian and Mississippian of the western U.S. We will examine how the 1 to 10 m cycles may be packaged into larger scale (1 to 10 m.y. duration) Vail-type sequences, utilizing a new application of a technique first used by Fischer (1964), to define short term changes in relative sea level. The technique provides a powerful, objective method of defining eustatic vs. subsidence effects at 1 to 10 m.y. scale, and allows recognition of sequence boundaries in cyclic carbonates. We will run 1-dimensional computer simulations of the stratigraphic sequences logged in the field, and 2-dimensional simulations to generate stratigraphic cross-sections that may be compared with actual cross-sections showing meter scale, vertical as well as lateral changes in rock types. Our models are capable of utilizing complex sea level curves to generate isostatically balanced, simulated stratigraphic sections and cross-sections showing rock changes at the meter-scale, necessary for a study of carbonate cycles. We will perform spectral analysis on deeper water facies in the sequences to determine if there is any record of Milankovitch climatic changes in the deeper water facies. The computer simulations will be constrained with geological data. This approach should provide us with a much firmer understanding of how carbonate cycles are arranged on carbonate platforms, how they are packaged in Vail-sequences, and how the various types of allocyclic and autocyclic mechanisms control their development in the Paleozoic. Research will document the effects of climatic and sea level change on the accumulation of sedimentary rocks.

我们将详细记录并测试美国西部晚寒武世和密西西比纪的经典地层剖面，并测试周期性的证据。我们将研究如何将 1 至 10 m 的周期打包成更大规模（1 至 10 m.y. 持续时间）的韦尔型序列，利用 Fischer (1964) 首次使用的技术的新应用来定义相对海平面的短期变化。该技术提供了一种强大、客观的方法来定义 1 至 10 m.y 的海平面上升与沉降效应。规模，并允许识别环状碳酸酯中的层序边界。我们将对现场记录的地层序列进行一维计算机模拟，并进行二维模拟以生成地层横截面，该横截面可与实际横截面进行比较，显示米级、岩石类型的垂直和横向变化。我们的模型能够利用复杂的海平面曲线来生成均衡平衡的模拟地层剖面和横截面，显示米级岩石变化，这是碳酸盐循环研究所必需的。我们将对序列中的更深水相进行光谱分析，以确定更深水相是否有米兰科维奇气候变化的记录。计算机模拟将受到地质数据的限制。这种方法应该让我们对碳酸盐岩循环如何在碳酸盐台地上排列、它们如何包装在韦尔层序中，以及各种类型的异环和自循环机制如何控制它们在古生代的发展有更坚定的了解。研究将记录气候和海平面变化对沉积岩堆积的影响。