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By A.H.N. Rice, Marc B. Edwards, and T.A. Hansen Field Guide 26 By A.H.N. Rice, Marc B. Edwards, and T.A. Hansen Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3738115/9780813756264_frontmatter.pdf by guest on 28 September 2021 Neoproterozoic Glacial and Associated Facies in the Tanafjord- Varangerfjord Area, Finnmark, North Norway by A.H.N. Rice Department of Geodynamics and Sedimentology University of Vienna Althanstrasse 14 1090 Vienna Austria Marc B. Edwards 3420 Yoakum Blvd Houston, Texas 77006 USA T.A. Hansen Talisman Energy Norge AS Verven 4 PO Box 649 Stavanger Norway Field Guide 26 3300 Penrose Place, P.O. Box 9140 Boulder, Colorado 80301-9140, USA 2012 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3738115/9780813756264_frontmatter.pdf by guest on 28 September 2021 Copyright © 2012, The Geological Society of America (GSA), Inc. All rights reserved. Copyright is not claimed on content prepared wholly by U.S. government employees within the scope of their employment. Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this volume for noncommercial use in classrooms to further education and science. Permission is also granted to authors to post the abstracts only of their articles on their own or their organization’s Web site providing the posting cites the GSA publication in which the material appears and the citation includes the address line: “Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org),” and also providing the abstract as posted is identical to that which appears in the GSA publication. In addition, an author has the right to use his or her article or a portion of the article in a thesis or dissertation without requesting permission from GSA, provided the bibliographic citation and the GSA copyright credit line are given on the appropriate pages. For any other form of capture, reproduction, and/or distribution of any item in this volume by any means, contact Permissions, GSA, 3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA; fax +1-303-357-1073; [email protected]. GSA provides this and other forums for the presentation of diverse opinions and positions by scientists worldwide, regardless of their race, citizenship, gender, religion, sexual orientation, or political viewpoint. Opinions presented in this publication do not reflect official positions of the Society. All photos courtesy of Hugh Rice except for Figures 44B and 65B. Published by The Geological Society of America, Inc. 3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA www.geosociety.org Printed in U.S.A. GSA Books Science Editors: Kent Condie and F. Edwin Harvey Library of Congress Cataloging-in-Publication Data Rice, A. H. N. (A. Hugh N.) Neoproterozoic glacial and associated facies in the Tanafjord-Varangerfjord area, Finnmark, north Norway / by A.H.N. Rice, Marc B. Edwards, T.A. Hansen. p. cm. Includes bibliographical references. ISBN 978-0-8137-0026-7 (pbk.) 1. Facies (Geology)—Norway—Tanafjorden. 2. Facies (Geology)—Varanger Fjord (Norway and Russia) 3. Geology—Norway—Finnmark fylke. 4. Geology, Stratigraphic—Proterozoic. I. Edwards, Marc B. II. Hansen, T. A. (Tor Arne) III. Title. QE281.R53 2012 554.84′6—dc23 2011053489 Front cover: Early evening view from Geaidnonjoasèohkat, northeastward to the peninsula (Álddarbákti) between Máldovuotna in the west and Vestertana in the east and thence across Tanafjord to Lille Molvika, on Varangerhalvøya, in the east (see Figs. 1 and 3 for direction of view). The hills on Varangerhalvøya are mostly quartzitic sandstones of the pre–Smalfjord Formation (≡Marinoan Glaciation) Tanafjord Group. The rounded steep-sided hills on the photo’s west side are of the Digermul Group, reaching from the Cambrian up to the Tremadocian. The low-lying rugged areas between, on the west side of Tanafjord and around Vestertana, are from the Vestertana Group (Ediacaran-Cambrian), here mostly of the Nyborg Formation, Mortensnes Formation (≡Gaskiers Glaciation), and younger rocks. The picture was taken standing on the Thin Sub-Member of the Middle Member of the Mortensnes Formation. The Thick Sub-Member forms the long buff-colored outcrop (Hárjas) beyond Louvdajavrit (the large lakes) on the southeast side of Máldovuotna. The ridges in the foreground, around and above the small lake, reflect the periodic mesoscale east-vergent folding in Member B of the Nyborg Formation. 10 9 8 7 6 5 4 3 2 1 Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3738115/9780813756264_frontmatter.pdf by guest on 28 September 2021 Contents Abstract . 1 Introduction . 2 Logistics . 2 Excursion timing . 2 Travel arrangements . 2 Accommodations . 2 Field logistics . 3 Maps and literature . 3 Geological Introduction . 4 Stratigraphy, sedimentology, and paleontology . 6 Structure and metamorphism . 8 Isotopic age constraints . 8 Magmatic history . 9 Paleolatitude and paleogeography . 9 Glacigenic deposits and associated strata . 9 Smalfjord Formation (≡ Marinoan Glaciation; late Cryogenian). 10 Nyborg Formation (interglacial succession) . 11 Mortensnes Formation (≡ Gaskiers Glaciation) . 12 Innerelv Member (postglacial) . 12 Facies and paleogeographic interpretation . 12 Stable isotopes and Neoproterozoic correlations . 14 Natural History and Cultural Background . 15 Excursion Route and Road Log . 19 Day 1. Lower Smalfjord Formation in South Varangerfjord and West Karlebotn, Varanger paleovalley (I) . 19 Introduction . 19 Stop 1.1: Lattanjar’ga Peninsula . 19 Stop 1.2: Gåppebalta and Sirdagåp’pi, S. Karlebotn . 21 Stop 1.3: Mar’kan (Karlebotn village) . 23 Stop 1.4: Karlebotn School . 24 Day 2. Lower Smalfjord Formation at Oaibaččanjar’ga and Selešnjar’ga, Varanger paleovalley (II) . 24 Introduction . 24 Stop 2.1: Vesterelv . 25 Stop 2.2: Oaibaččannjar’ga (Bigganjar’ga, Cape Headache) . 25 Stop 2.3: Larajœg’gi and unnamed hill . 30 iii Downloaded from http://pubs.geoscienceworld.org/books/book/chapter-pdf/3738115/9780813756264_frontmatter.pdf by guest on 28 September 2021 iv Contents Day 3. Lower Smalfjord Formation on Skjåholmen and Vieranjar’ga, Varanger paleovalley (III) . 31 Introduction . 31 Stop 3.1: Southeast coast of Skjåholmen viewed from the boat . 31 Stop 3.2: Skjåholmen eastern end . 33 Stop 3.3: View of NE corner of Vieranjar’ga peninsula . 34 Stop 3.4: Vieranjar’ga peninsula . 34 Day 4. Lower Smalfjord Formation and cap dolostones along N. Varangerfjord and Leirpollen, Varanger paleovalley (IV) . 40 Introduction . 40 Stop 4.1: Handelsneset . 44 Stop 4.2: Hammarnes Quarry . 46 Stop 4.3: Gis’kananjåkka (east of Nesseby) . 47 Stop 4.4: View to Ruok’sadas . 49 Stop 4.5: Leirpollen . 49 Day 5. Glacigenic rocks in the South Tanafjord-Vestertana area . 51 Introduction . 51 Stop 5.1: Šœresgied’djav’ri . ..
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