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The report contains the results of the 2006 fieldwork and the following analytical studies of the collected samples including U-Pb detrital zircon (14 sampl.) and Ar-Ar (9 sampl.) geochronology, whole-rock Sm-Nd isotopic (17 sampl.) and chemical (23 sampl.) studies, stable isotopes (40 sampl.), heavy minerals composition (13 sampl.), XRD clay minerals (40 sampl.), apatite fission track (8 sampl.), vitrinite reflection (11 sampl.), Rock-Eval studies (23 sampl.), and description of 150 thin sections (see Fig. 1 for location of the visited sites). The project was designed to shed more light on:

� Structural relationship between New Siberian-Chukchi Fold Belt, and North and South Chukchi basins;

� Main uplift/cooling/erosion pulses;

� Paleozoic and Mesozoic hydrocarbon systems;

� Paleogeographic restorations and the main sediment supply pathways

The report begins with characterization of Wrangel Island tectonic setting, and description of the studied tectono-stratigraphic units.

Main emphasizes is given to structural characteristics of Paleozoic and Triassic TSU, and to new data from conodont stratigraphy. The following chapters summarize and interpret new data on bulk rock geochemistry, mineralogy, Sm-Nd and Ar-Ar isotopic composition, U-Pb detrital zircon chronostratigraphy, δO and δC in carbonate rocks, X-Ray diffraction of clay minerals; Rock-Eval data on source rock TOC and maturity.

New results allowed for:

� distinguishing tectonic events and transregional correlation;

� more accurate definition of stratigraphic age of some sedimentary successions;

� characterization of paleogeography and sources of clastic material.

Important results were obtained in characterizing the hydrocarbon systems of Wrangel Island which can be used as a proxy for the North Chukchi Basin petroleum evaluation.

TGS | REGIONAL GEOLOGICAL STUDY OF WRANGEL ISLAND 2013

REGIONAL GEOLOGICAL STUDY OF WRANGEL ISLAND

Russian Chukchi Sea - Based on 2006 Fieldwork Results

Geological map of Wrangel Island (modified from Kos’ko et al., 2003) showing location of the 2006 field works (black rectangles): 1 – Khishnikov River; 2 – Somnitelnaya River; 2A – Chertov Creek mouth; 3 –Neizvestnaya and Mamontovaya rivers, 4 – Cape Florens; 5 – Cape Ptichiy Bazar and Cape Zanes

Q Quaternary

K2-N1 Late Cretaceous to Miocene

T Triassic

P Permian

C1-3 Early to Late Carboniferous

C1 Early Carboniferous

D Devonian

S2-D1 Late Silurian to Early Devonian

PR2 Neoproterozoic Wrangel Complex

Executive Summary

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WRANGEL ISLAND REPORT

TGS | WRANGEL ISLAND REPORT 2013

IntroductionWrangel Island is located between the East Siberian and Chukchi seas 140 km away from the Chukotka Peninsula from which it is separated by Longa Strait (Fig. 1). It is 150 km long in WE direction and 80 km wide in N-S direction, and is about 7300 km2 in size. Due to its position, island represents a key area for understanding geology of the East Siberian and Chukchi seas and for reconstructing the eastern Arctic tectonic history.

The report represents a summary of geological and analytical studies carried out from January to December 2011 with total duration close to 11 mounts. Three members of the project team, S.D. Sokolov, M.I. Tuchkova, and V.E. Verzhbitsky, were involved into fieldwork carried out on Wrangel Island by International Russian-American-Swedish Geological Expedition in 2006.

Therefore the report is mainly based on 2006 fieldwork results carried out in the central, western and southern parts of island. Many analytical data provided in this report have never been published before, and are not a public domain data. The overall supervising of the analytical work was done by A. Khudoley.

Figure I.1. Main physiographic provinces of the Arctic. Upper right insertion is the Geological map of Wrangel Island, after Kos’ko et al.

� List of figures

� List of attachments

� Executive Summary

� Introduction

� Chapter 1. Tectonic setting

� Chapter 2. Geological framework and lithostratigraphy

� Chapter 3. Structural style and tectonic phases

� Chapter 4. Clastic provenance and paleogeography

� Chapter 5. TOC and rock maturity

� Summary 1: Tectonic and paleogeography of the Russian Chukchi shelf based on Wrangel data

� Summary 2: Wrangel proxies for deciphering hydrocarbon systems of the North Chukchi Basin: source rock, reservoirs, seals, trap formation

� References

Content � Attachment 1. List of samples and location map

� Attachment 2. U-Pb LA-ICP-MS detrital zircons study

� Attachment 3. Sm-Nd isotopic data

� Attachment 4. δ18C and δ13O isotopic study of carbonate rock

� Attachment 5. Whole-rock chemical composition of clastic rocks

� Attachment 6. Heavy mineral data

� Attachment 7. X-Ray diffraction analysis of clays samples

� Attachment 8. Apatite fission track study

� Attachment 9. Ar-Ar isotopic study

� Attachment 10. Vitrinite reflectance

� Attachment 11. RockEval-6 study11 – X-Ray diffraction analysis of clay samples

Attachments

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Clapton Research Geology, Project Leader Andrei Khudoley Tel: +7-921-7573876 Email: akhudoley@gmail.com

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