Geochemical and mineralogical recognition of the bentonites in the lower Pierre Shale Group and their use in regional stratigraphic correlation

被引：13

作者：

Department of Physics and Geology, Northern Kentucky University, Highland Heights, KY 41099, United States ^{[1
]}

不详 ^{[2
]}

不详 ^{[3
]}

机构：

[1] Department of Physics and Geology, Northern Kentucky University, Highland Heights

[2] Department of Geology, University of Cincinnati, Cincinnati

[3] Museum of Geology, South Dakota School of Mines and Technology, Rapid City

来源：

Spec. Pap. Geol. Soc. Am. | 2007年 / 23-50期

关键词：

Bentonites; Geochemistry; Pierre Shale; Sharon springs; Stratigraphy;

D O I：

10.1130/2007.2427(03)

中图分类号：

学科分类号：

摘要：

The lower Pierre Shale consists primarily of the Sharon Springs Formation, which has been correlated regionally throughout Kansas, Colorado, Nebraska, Wyoming, South Dakota, and North Dakota. The unit represents distal sedimentation in a tectonically active foreland basin. Correlation of the lower Pierre Shale Group is complicated by the application of a single name, the Sharon Springs, to a wide range of facies. Bentonite correlation provides an independent framework for verifying the age equivalence of various facies of the Sharon Springs Formation. Bentonite correlation involves using a variety of unique chemical characteristics to differentiate individual beds. A combination of whole rock rare-earth-element geochemistry, phenocryst composition, biotite geochemistry, and stratigraphic position has been used to correlate bentonites of the lower Pierre Shale and equivalent units across the Western Interior of the United States. © 2007 The Geological Society of America. All rights reserved.

引用

页码：23 / 50

页数：27

共 41 条

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