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

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Published by means of the yank Geophysical Union as a part of the Field journey Guidebooks Series.

The time of earliest arrival of guy within the Montana-Wyoming zone is debatable. in spite of the fact that, early guy was once good proven by way of 11,500 year B.P. as proven by means of numerous 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 ancient time. The northern plains have been occupied by way of the plains wooded area humans from the east in approximately a hundred A.D.

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 kinds 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 resources for Montana High-Potassimn Igneous Province: Crazy Mountains to Jordan, Montana

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1988). high-level magma reservoirs could thus result in resorption of phlogopite and saturation in olivine and leucite. , Zindler and Hart, 1986). , 1988). 8 Ga, and are consistent with the existence of enriched lithospheric mantle of this age beneath the MontanaWyoming province, as suggested by Dudas et al. (1987). The glimmer i te-veined harzburgite xenolith in the most primitive minette may represent a sample of this mantle material. , 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.

Two further stops near Geraldine at the Headed Dike and Haystack Butte are also planned. 7. In this guide, the following abbreviations will be used: Tmpd Tmps Tmd Tlb Tertiary Tertiary Tertiary Tertiary To Ft. :z:2:J Lost Lake Laccolith 11 (j Haystack Butte 4 km 2 miles • ' - - ....... {;)/ ,; . " . , \. 7 Map of field trip route and designated stops. kin miles o o Entrance to Shonkin Ranch. 4 STOP 1: TERTIARY CONGLOMERATE AND LATITE BRECCIA On left side of road good ~xposures of Tertiary conglomerate (Tc) and latite breccia (Tlb) appear to be juxtaposed along a high-angle fault.

3) from the access road: -- A wall of dark gray shonkinite is cut by prominent columnar joints. late Cretaceous Eagle Sandstone. -- The magnificently exposed eastern contact shows the laccolith feathering into the thinly bedded Eagle Sandstone in a swarm of dark sills. 3 Shonkin Sag laccolith from the south. The eastern contact feathers into the light-colored Eagle Sandstone to the right. 9 Entrance to the 4 Sisters Ranch. Red gate in front of the old stone house built in 1890 at the entrance to Tanner Canyon and Shonkin Sag laccolith.

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