Correlation of Precambrian rocks of the Lake Superior region, United States

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by
Dept. of the Interior , Washington, DC
Geology, Stratigraphic -- Precambrian., Stratigraphic correlation -- Superior, Lake, R
Statementby G.B. Morey and W.R. Van Schmus.
SeriesCorrelation of Precambrian rocks of the United States and Mexico, Geological Survey professional paper -- 1241-F.
ContributionsVan Schmus, W. R.
Classifications
LC ClassificationsUSGSPPAP#1241-F 1988
The Physical Object
Pagination31 p. :
ID Numbers
Open LibraryOL22072375M
LC Control Number87-600313

CORRELATION OF PRECAMBRIAN ROCKS OF THE UNITED STATES AND MEXICO CORRELATION OF PRECAMBRIAN ROCKS OF THE LAKE SUPERIOR REGION, UNITED STATES By G.B. MOREY1 and W.R. VAN SCHMUS2 ABSTRACT Precambrian rocks in the Lake Superior region underlie parts of Min­ nesota, Wisconsin, and Michigan, very near the Cited by: Get this from a library.

Correlation of Precambrian rocks of the Lake Superior region, United States. [G B Morey; W R Van Schmus; Geological Survey (U.S.),]. General Information. Title: Correlation of Precambrian rocks of the Lake Superior region, United States Author(s): Morey, G.B., and Van Schmus, W.R.

Publishing Organization: U.S. Geological Survey Series and Number: Professional Paper F Larger Work: Correlation of Precambrian rocks of the United States and Mexico Publication Date: Map Scale:.

The distribution of Precambrian rocks is worldwide, but in the United States rocks of this age are found in the cores of major mountain ranges.

They also occur in the Lake Superior region and in a few localities in the southwest. Precambrian Geology - East. On the correlation chart for Precambrian rocks of the conterminous United States, the Bayfield Group in United States book Lake Superior region is shown as Middle Proterozoic (approximately Ma).

Source: GNU records (USGS DDS-6; Reston GNULEX). Lithologic geophysical, and mineral commodity maps of Precambrian rocks in WI: USGS,Morey, G (and others) Geologic map of the Lake Superior region: Precambrian Geology of the United States.

Some Precambrian rocks around Lake Superior are younger than Archean, dating from a time known as Early Proterozoic. This was when primitive life was developing, mainly bacteria and algae. These sedimentary rocks formed in a large sea and the rocks today can be found in Michigan’s Upper Peninsula, west of Duluth and to Cloquet and on the.

The complex geology of the Lake Superior region is one of the most interesting in the United States to mineral and gemstone collectors since it encompasses such treasured specimens as Lake Superior agates, thomsonites, kona dolomite, jaspilite, chlorastrolite, gold, native copper and silver, and many s: 6.

The midcontinent of the United States hosts some of the world's largest, economically most valuable mineral districts and metallogenic provinces. The Precambrian iron deposits of the Lake Superior region include both Algoma- and Lake Superior-type Fe and Fe-Mn ores.

Taconite (IPA: ['tækənaɪt]) is a variety of iron formation, an iron-bearing (over 15% iron) sedimentary rock, in which the iron minerals are interlayered with quartz, chert, or name "taconyte" was coined by Horace Vaughn Winchell (–) – son of Newton Horace Winchell, the Minnesota State Geologist – during their pioneering investigations of the Precambrian.

Precambrian - Precambrian - Greenstones and granites: Greenstone-granite belts such as those of the Archean continued to form in the Proterozoic, albeit in greatly reduced amounts.

They are characterized by abundant volcanic rocks that include pillowed subaqueous basalt flows and subaerial and subaqueous volcaniclastic rocks. Magnesian komatiites are for the most part. An official website of the United States government. Here’s how you know. Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan.

Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: Series title: IMAP: Series number: The syncline appears to connect at its western end with a narrow trough of Keweenawan rocks which extends northward from the central United States and only emerges from beneath a cover of younger sediments in the Lake Superior region.

The Lake Superior syncline thus forms part of a major tectonic feature of North America. The stone weighed carats and is the largest diamond on record ever recovered in the State, and the fifth largest in the United States.

Download Correlation of Precambrian rocks of the Lake Superior region, United States FB2

Because these, and the several other diamonds discovered in the Lake Superior region, have come from glacial deposits, there has been much speculation on the source of the diamonds. Pre-Cambrian rocks of the Lake Superior Region: a review of newly discovered geologic features, with a revised geologic map.

United States Department of the Interior. Description: ii, 34 pages: folded color map (in pocket) folded tables ; 29 cm. Precambrian.

Geology -- Superior, Lake. Geology. Geology, Stratigraphic. Precambrian. UNITED STATES DEPARTMENT OF THE INTERIOR Harold L. Ickes, Secretary Minnesota USGS Professional Paper – Pre-Cambrian Rocks of the Lake Superior Region – Page 1 of 31 GEOLOGICAL SURVEY W.

Mendenhall, Director Professional Paper Different hypotheses PRECAMBRIAN ROCKS OF THE LAKE SUPERIOR REGION A REVIEW OF. CONTRIBUTIONS TO PRECAMBRIAN GEOLOGY OF LAKE SUPERIOR REGION A Regional Structural Model for Gold Mineralization in the Southern Part of the Archean Superior Province, United States By P.K.

Sims and W.C.

Details Correlation of Precambrian rocks of the Lake Superior region, United States PDF

Day Abstract The Canadian segment of the Archean Superior province is a major world source of lode gold. The gold deposits occur. From abstract: Detailed knowledge of the geology of the pre-Cambrian rocks of the Lake Superior region has been greatly augmented since the publication of Monograph 52 by the United States Geological Survey in The authors have attempted in the present report to assemble as much of this new information as possible, and to give the reader a birdseye view.

Introduction to Correlation of Precambrian Rock Sequences By JACK E. HARRISON and ZELL E. PETERMAN CORRELATION OF PRECAMBRIAN ROCKS OF THE UNITED STATES AND MEXICO Edited by JACK E. HARRISON and ZELL E. PETERMAN G E 0 L O.

G I CAL SUR V E Y PRO F E S S ION ALP APE R 1 2 4 1 -A An introduction to interregional correlation. The Baraboo Quartzite and overlying metasediments in south-central Wisconsin long were assumed correlative with middle Precambrian Huronian and/or Animikean strata of the Lake Superior region-that is, presumably between 1, and 2, m.y.

Description Correlation of Precambrian rocks of the Lake Superior region, United States PDF

old. Like Animikie rocks in northern Wisconsin and Michigan, the pure quartzite at Baraboo is overlain by dolomite. Correlation of Precambrian rocks of the Lake Superior region, United States Professional Paper F By: G.B.

Morey and W. Van Schmus. Petrology ina landmark book that was recently reprinted, and Sedimentary Rocks the United States at the invitation of the U.S. Geological Survey. With all of these activities, Precambrian of the Lake Superior region.

In a department where the Precambrian. SEDIMENTARY ENVIRONMENTS FOR IRON-FORMATION Iron-formations of the Lake Superior region of the United States were the first to be mined on a large scale for iron ore and to have their geological setting described in detail.

StockweU, C.H., Proposals for time classification and correlation of Precambrian rocks and events in Canada.

The Keweenaw Peninsula is the heart of the best rock collecting ground in the North Central States. Their listings sound like a rock museum: the rainbow colors of Lake Superior agates all along the shore, with banded agates in the Eastern U.P., jasper, pearly-pink thompsonite, quartz, native copper and datolite found in discarded rock piles.

Map of the Precambrian Bedrock in the Lake Superior region highlighting the generalized geology and major structural features. (After Morey and Van Schmus, ) METHODS An INAM Expert -Mobile X Ray Fluorescence Portable Express Analyzer (XRF).

Precambrian life. Precambrian rocks were originally defined to predate the Cambrian Period and therefore all life, although the term Proterozoic was later coined from the Greek for “early life.” It is now known that Precambrian rocks contain evidence of the very beginnings of life on Earth—which, based on the age of the rocks that contain the oldest evidence of life, took.

Mona Schist of early Precambrian age. The upper part of the Reany Creek Formation is faulted against sheared metavolcanic rocks of the Mona Schist. The middle sequence, which consists of slate and graywacke containing dispersed boulders of granitic rock, is similar in composition to other formations in the Lake Superior region.

MS Book and Mineral Company W. / CORRELATION OF PRECAMBRIAN ROCKS OF THE LAKE SUPERIOR REGION, UNITED STATES,pb, 31 pages, 1 plate (in pocket), 9 figs., $ 20 / A REGIONAL STRUCTURAL MODEL FOR GOLD MINERALIZATION IN THE SOUTHERN PART OF THE ARCHEAN SUPERIOR PROVINCE, UNITED STATES.

Because the southern part of the anomalous area is blanketed by Paleozoic sediments, the cause of the anomaly was sought first at its northern end, around Lake Superior, where Precambrian rocks crop out to facilitate a correlation of gravity and geology.

Around western Lake Superior the positive anomalies correlate with Keweenawan lava and gabbro. For example, many Rb-Sr isochron and K-Ar whole-rock ages on rocks associated with Keweenawan rifting in the Lake Superior region (Michigan and Wiscon- sin) are in the range Ma [16].

It has been argued that in several instances other isotopic data or paleomagnetic data show that these ages cannot be crystallization ages and that they. During the first part of the Proterozoic, a million year-period of quiet, which we name the Huronian from its record north of Lake Huron, thick sediments were laid down in a shallow sea trough that covered the Lake Superior region.

In places thick sand was deposited; in other fine muds, and in other places pure lime, accumulated in the.exposed Precambrian rock in the United States, the Lake Superior region. Many of the critical geologic relationships of the district occu~ within the Quadrangle.

In terms of surface exposures, the region lies at the southern extremity of the North American Shield, but if the subsurface geology is considered, it is located. ern Michigan, in the Lake Superior region of the United States.

Radiometric age con-straints from events predating and postdat-ing depo si tion of the breccia are ca. Ma and Ma. The major bolide impact that occurred at Ma at Sudbury, Ontario, – km east of these sites, is the likely causative event. The Michigan sites de.