Download or read book Geochronology of Older Precambrian Rocks in Gila County Arizona written by Donald Everett Livingston and published by . This book was released on 1969 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: A sequence of Older Precambrian volcanic and sedimentary rocks more than 15,000 feet thick occurs in the Blackjack Mountains and White Ledges, 20 miles north of Globe, Arizona. This sequence consists of (from older to younger) the Redmond formation (acidic volcanic rocks) and the Hess Canyon group (clastic sedimentary rocks). The Hess Canyon group is subdivided into: the White Ledges formation (interbedded quartzites and argillaceous rocks); the Yankee Joe formation (argillaceous strata with interbedded graywackes and arkoses); and the Blackjack formation (argillaceous quartzites). These rocks have been intruded by the Ruin Granite (a porphyritic quartz monzonite) and subsequently eroded to approximately the present level of exposure prior to the deposition of the Younger Precambrian Apache Group. The unconformity between the Older and Younger Precambrian strata is well exposed at Butte Creek north of Haystack Butte. Diabase has intruded the Blackjack formation, the Ruin Granite and the Apache Group. No Paleozoic or Mesozoic rocks are known to occur within the surveyed area. Sediments and volcanic and sedimentary rocks of Tertiary and Quaternary age partly conceal the older rocks. The Hess Canyon group can be correlated with the Deadman Quartzite, Maverick Shale, and Mazatzal Quartzite of the Mazatzal Mountains (Wilson 1939a) and also the Houden Formation of the Diamond Butte Quadrangle (Gastil 1958). Whole rock Rb-Sr dating indicates an age of 1,510 ± m.y. for the Redmond formation. Isotopic dating of the Ruin Granite near the Blackjack Mountains and of the granitic rocks intruded the Mazatzal Quartzite of Four Peaks in the southern Mazatzal Mountains indicates that the Mazatzal Orogeny (the Mazatzal Revolution of Wilson, 1939a) occurred 1,425 to 1,380 m.y. ago in central Arizona. This orogeny followed the deposition of the Mazatzal Quartzite and the Hess Canyon group, terminating older Precambrian time in Arizona and was followed by the deposition of the Younger Precambrian Apache Group. Isotopic dating of volcanic metamorphic and plutonic rocks in the Pinal and Tortilla Mountains and near Roosevelt Dam on the Salt River indicate that portions of the Pinal Schist in the type locality are greater than 1,730 m.y. old and that these rocks have experienced a complex series of events in Older Precambrian times. The Madera Diorite of Ransome (1903) consists of rocks 1,730 ± 30 m.y. old as well as rocks about 1,500 m.y. old. The Older Precambrian igneous rocks in this part of Arizona appear to have developed from material similar in Rb to Sr ratio to average shallow continental crust. These rocks formed during the interval 1,730 to 1,370 m.y. ago. The continental crust in this region probably originated no earlier than about 1,800 m.y. ago. Igneous rocks younger than 1,370 m.y. have not been derived soley from average shallow crustal material.

Download or read book Older Precambrian Rocks of the Diamond Butte Quadrangle Gila County Arizona written by R. Gordon Gastil and published by . This book was released on 1958 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Younger Precambrian Geology in Southern Arizona written by Andrew Fletcher Shride and published by . This book was released on 1967 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stratigraphic lithologia, and structural features of Younger Precambrian rocks of southern Arizona as a basis for understanding their paleogeography and establishing their correlation.

Download or read book Precambrian Conterminous U S written by John C. Reed, Jr. and published by Geological Society of America. This book was released on 1993 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: This wide-ranging discussion of Precambrian rocks includes contributions from a diverse array of authors actively engaged in investigations of various aspects of U.S. Precambrian geology. Summary discussions by the editors of the five major chapters place these contributions in a logical regional framework.

Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1972 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Theses in Geology 1967 1970 written by Dederick C. Ward and published by Geological Society of America. This book was released on 1973 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1976 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geologic Evolution of Arizona written by and published by . This book was released on 1989 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1972 with total page 1178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Arizona Geological Society Digest written by Arizona Geological Society and published by . This book was released on 1989 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rubidium strontium Geochronology and Trace Element Geochemistry of Precambrian Rocks in the Northern Hualapai Mountains Mohave County Arizona written by Edward Joseph Kessler and published by . This book was released on 1976 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geologic Excursions in Southwestern North America written by Philip A. Pearthree and published by Geological Society of America. This book was released on 2019-09-23 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precambrian Geology of the United States written by Philip B. King and published by . This book was released on 1976 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Abstracts of North American Geology written by Geological Survey (U.S.) and published by . This book was released on 1970-07 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geological Survey Bulletin written by and published by . This book was released on 1972 with total page 1492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precambrian written by John Calvin Reed (Jr.) and published by . This book was released on 1993 with total page 680 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Special Paper written by and published by . This book was released on 1977 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: