Download Montana High-Potassimn Igneous Province: Crazy Mountains to by B. Carter Hearn Jr., F. O. Dudas, D. H. Eggler, D. W. PDF

By B. Carter Hearn Jr., F. O. Dudas, D. H. Eggler, D. W. Hyndman, H. E. O'Brien, I. S. McCallum, A. J. Irving, R. B. Berg

About The Product

Published through the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

The time of earliest arrival of guy within the Montana-Wyoming quarter is debatable. despite the fact that, early guy used to be good confirmed by means of 11,500 12 months B.P. as proven via a number of websites of Clovis-style stone artifact issues in Montana and Alberta. Well-dated websites in Montana diversity from approximately 11,500 year B.P. to fresh historical time. The northern plains have been occupied by means of the plains forest humans from the east in approximately a hundred A.D.

Content:
Chapter 1 creation: T346 Montana High?Potassium Igneous Province (pages 1–5): B. Carter Hearn
Chapter 2 loopy Mountains, Montana (pages 7–22): F. O. Dudas and D. H. Eggler
Chapter three Geology of the Highwood Mountains, Montana: A Survey of Magma varieties and assets (pages 23–35): Stewart Mccallum, Hugh E. O'Brien and Anthony J. Irving
Chapter four Shonkin Sag and sq. Butte Laccoliths, Montana (pages 37–49): Donald W. Hyndman, David Alt and Kathy Tureck?Schwartz
Chapter five Bearpaw Mountains, Montana (pages 51–61): B. Carter Hearn
Chapter 6 Missouri Breaks Diatremes, Montana (pages 63–73): B. Carter Hearn
Chapter 7 Smoky Butte Lamproite, Montana (pages 75–78): B. Carter Hearn
Chapter eight References (pages 79–86):

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Extra info for Montana High-Potassimn Igneous Province: Crazy Mountains to Jordan, Montana

Sample text

Its base is well exposed, and small remnants of its roof survive. Erosion of the Shonkin Sag, the overflow spillway of Glacial Lake Great Falls, removed one side of the laccolith to expose a spectacular cross section in the steep valley wall. Pirsson (1905) first I mi. -------- .......... "" "" "- "- , "" , " . : .... ~\. - ........ • 380 . / 0 :"'....... : . ", " ' ······.. 3 " 60 ' 0 •• ~~......... : ..... ~ ;;(\ ".... ,... 'v

Turn left, north. Turn right, east. STOP 11: HAYSTACK BUTTE This small stock of monticellite peridotite with adjacent metasomatized sedimentary rocks was descr ibed by Buie (1941) and has been mapped by B. C. Hearn, Jr. 13). The summit of the butte provides panoramic views of Eagle Buttes and the Bearpaw Mountains to the northeast; the Judith and Moccasin Mountains to the southeast; Square Butte, Round Butte, Palisade Butte and the sedimentary cover of the Shonkin Sag laccolith to the south; and the Highwood Mountains to the southwest.

1988b). , 1988). Thus, the petrogenesis of the latites appears to have invol ved the same mantle reservoirs as the minettes; however, ,the higher silica contents in the latites may be attributable to higher activities of H20 in the early stages of melting of metasomatized mantlewedge material. 6) between the two major This research was supported by National Science Foundation Grant EAR-8511368. B. C. Hearn, Jr. generously provided his geologic map of Haystack Butte for inclusion in this section.

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