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Collaborative Research: Clinker Geochronology and Geomorphic Evolution of the Powder River Basin, Wyoming

合作研究：怀俄明州粉河盆地的熟料地质年代学和地貌演化

基本信息

批准号：
0518818
负责人：
Peter Reiners
金额：
$ 12万
依托单位：
Yale University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2005
资助国家：
美国
起止时间：
2005-10-01 至 2006-10-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0518818&HistoricalAwards=false
关键词：
Collaborative Research Clinker Geochronology Geomorphic

项目摘要

Clinker, rock metamorphosed by natural coal burning, has formed in the Powder River Basin (and other areas of the Rocky Mountains) since at least Pliocene. Clinker dominates the topographic form of many of the basins in which it is found, because it is more resistant to weathering than surrounding unaltered bedrock. It also preserves a record of the spatial-temporal patterns of fluvial incision, lateral backwasting, and plateau formation in these landscapes, because coal only burns when close to the surface, above the water table and ventilated with surface oxygen. Using (U-Th)/He ages of detrital zircons that are reset during clinker formation, we will map the patterns of coal burning and shallow exhumation in detail in several regions of the PRB in Wyoming and Montana, as well as characterize clinker ages over a broader scale throughout the basin. Model predictions of clinker age-patterns in individual drainages and across the landscape suggest that our results will be able to discriminate between at least some of these possible climatological or tectonic mechanisms driving landscape evolution. This work will form the basis of collaborative research between Reiners and Riihimaki, as well as individuals in the BLM and the Northern Cheyenne Tribe, and undergraduate students from Yale and Bryn Mawr.

至少从上新世开始，粉河盆地（以及落基山脉的其他地区）就形成了由天然煤炭燃烧变质而成的熟料岩。在许多发现熟料的盆地中，熟料在地形形态上占主导地位，因为它比周围未蚀变的基岩更能抵抗风化。它还保存了这些景观中河流切割、侧向回蚀和高原形成的时空模式的记录，因为煤只在接近地表、高于地下水位并与地表氧气通风时燃烧。利用在熟料形成过程中重置的碎屑锆石的(U-Th)/He年龄，我们将详细绘制怀俄明州和蒙大拿州PRB几个地区的煤炭燃烧和浅层挖掘模式，并在整个盆地的更大范围内表征熟料年龄。对单个流域和整个景观的熟料年龄模式的模型预测表明，我们的结果将能够区分至少一些可能的气候或构造机制驱动景观演变。这项工作将成为Reiners和Riihimaki，以及BLM和Northern Cheyenne部落的个人，以及耶鲁大学和布林莫尔大学的本科生之间合作研究的基础。