Sedimentary formations of the Cretaceous Sakhalin Basin (Far East Asia) |
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| Authors: | A Alabushev |
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| Institution: | (1) Geologisch-Pälaontologisches Institut und Museum, Sigwartstraße 10, D-72076 Tübingen, Germany;(2) Present address: American Museum of Natural History, Department of Invertebrates, Central Park West at 79th Street, 10024 New York, NY, USA |
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| Abstract: | The marine sedimentary formations of the Middle Albian to Maastrichtian in the Cretaceous Sakhalin Basin (CSB) were investigated. These successions of strata consist of interbedded sandy, clayey and calcareous rocks which are underlain by heterogeneous metamorphosed (up to greenschist facies) Paleozoic to Mesozoic (pre-Aptian) rocks. The studied sections display several different facies reflecting geological settings ranging from an inner shelf to a continental slope. Three depositional complexes bound by regional subaerial unconformities are recognized within the marine successions. Since the Albian, the CSB has been a rapidly subsiding marginal part of the Okhotsk Sea plate. The Naiba Valley succession, corresponding to a sublittoral zone, shows extremely high sedimentation rates up to 190 m/Ma. The stratigraphic distribution of lithofacies indicates that the CSB became shallower from the Middle Albian to the Maastrichtian. |
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| Keywords: | Cretaceous Sakhalin Basin continental margin subsidence sedimentation stratigraphy |
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