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Abstract
Macdonald, D., and R. Flecker,
DOI:10.1306/1209869M871399
2007 by The American Association of Petroleum Geologists.
Injected Sand Sills in a Strike-slip Fault Zone: A Case Study from the Pil'sk Suite (Miocene), Southeast Schmidt Peninsula, Sakhalin
David Macdonald,1 Rachel Flecker2
1Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, United Kingdom
2Bristol Research Initiative for the Dynamic Global Environment, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom
ACKNOWLEDGMENTS
Fieldwork on Sakhalin was conducted as part of the Cambridge Arctic Shelf Programme (CASP) Research Program funded by Agip, Anadarko, Arco, BP, Exxon, the Japan National Oil Corporation, Mobil, Philips, and Texaco. Work was in collaboration with Sakhalin Geological Research Expedition (SGRE), Yuzhno-Sakhalinsk; logistic support was provided by SGRE. The scientific party comprised Christine Brouet-Menzies (translator, CASP), Richard Weaver (paleomagnetist, University of Southampton), Vladimir Galversen (geologist, SGRE), Pavel Kovtunovich (geologist, SGRE), Boris Salnikov (director, Sakhalinnipimorneft, Okha). We are grateful to all our colleagues for their stimulating discussions. We also thank Zhenia Rasshchepkina and Valeriy Gorbachov for their support in the field. We are also indebted to late Yuri Kovtunovich, then chief geologist of SGRE, for his support and friendship. We are grateful to Matt Brettle, Andrew Hurst, and Olivier Parize for their thorough reviews of the manuscript.
ABSTRACT
This chapter describes sandstone sills intruded into the middle Miocene Pil'sk Suite, which are well exposed along a continuously exposed 8-km (5-mi) section on the southeast coast of Schmidt Peninsula, Sakhalin (Russian Far East). This suite forms part of a relatively thin Neogene succession (probably no more than 1100 m thick [3608 ft]), which unconformably overlies Cretaceous deposits. The succession was deposited on a topographic high, which marks the Mesozoic outer arc high and is now deformed within a large-scale dextral strike-slip fault system, part of the Eurasia–North America plate boundary. The Pil'sk Suite is dominated by organic-rich biosiliceous rocks (opoka, porcelanite, and rare chert). Within this siliceous succession are abundant brown, well-cemented sandstones, subparallel to bedding, with erosional top and bottom contacts. Their changing stratigraphic position makes correlation across distances greater than about 10 m (33 ft) difficult. They are interpreted as having an injected origin.
Trains of upright to gently inclined folds deform the pre-late Miocene succession, including the brown sandstones. The vergence of these structures, and the transport direction of associated thrust faults, is generally toward the southwest. The injected sandstone sills were clearly cemented prior to brittle deformation. Deformation is concentrated into high-strain zones spaced approximately 1 km (0.6 mi) apart, which are probably part of a large flower structure. Almost all the sandstone sills are found within these zones, adding several tens of meters to the stratigraphic thickness. Given the relatively thin post-middle Miocene succession, it is likely that this injection resulted in coeval deformation of the sediment surface.
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