Zinc and Lead Deposits of Southeastern Alaska: Zinc-copper Deposit at Tracy Arm Petersburg District Alaska
Author: Geological Survey (U.S.)
Publisher:
Published: 1953
Total Pages:
ISBN-13:
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Author: Geological Survey (U.S.)
Publisher:
Published: 1953
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: Geological Survey (U.S.)
Publisher:
Published: 1953
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: Hugh Richard Gault
Publisher:
Published: 1953
Total Pages: 366
ISBN-13:
DOWNLOAD EBOOKAuthor: Hugh Richard Gault
Publisher:
Published: 1953
Total Pages: 13
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DOWNLOAD EBOOKAuthor: Geological Survey (U.S.)
Publisher:
Published: 1953
Total Pages: 382
ISBN-13:
DOWNLOAD EBOOKAuthor: H R Gault
Publisher: Forgotten Books
Published: 2018-03-21
Total Pages: 24
ISBN-13: 9780365186854
DOWNLOAD EBOOKExcerpt from Zinc-Copper Deposit at Tracy Arm Petersburg District Alaska The area in the vicinity of Tracy Arm is underlain mainly byk'a group of northwest-trending metamorphic rocks that flank the west edge of the Coast Range batholith. (see pl. These rocks are here subdivided into three zones: an eastern zone of light-brown schists; a central zone of dark-green schists, black phyllites and gray-green schists and a western zone of light-green chlorite schists. The bound aries, based in part on lithology and in part on degree of metamorphism, are not sharply defined. The metamorphic rocks are bordered on the east by quartz diorite gneiss of the Coast Range batholith. Silicic dikes and Sills that seem to be genetically associated with the batholith also have intruded the metamorphic rocks. Lamprophyre dikes are' the youngest igneous rocks in the area and intrude both the quartz diorite gneiss and the schists. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author: Elizabeth Claire Fischer
Publisher:
Published: 1955
Total Pages: 360
ISBN-13:
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Publisher:
Published: 1967
Total Pages: 1056
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DOWNLOAD EBOOKAuthor: David A. Phoenix
Publisher:
Published: 1963
Total Pages: 588
ISBN-13:
DOWNLOAD EBOOKPrepared on behalf of the U.S. Atomic Energy Commission and published with permission of the Commission.
Author: Arctic Institute of North America
Publisher:
Published: 1955
Total Pages: 1290
ISBN-13:
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