Geodynamic evolution of the lithosphere of the Sea of Okhotsk region from geophysical data

Verzhbitsky, E. V.; Kononov, M. V.

doi:10.1134/s1069351306060061

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…Deep seismic sounding data show that in the central part of the Okhotsk Sea Plate the depth of the Moho surface is greater than 30 km, which suggests, along with dredging data, the development of the continental crust (Piip & Rodnikov, ). Geophysical investigations show that the continental crust of the Okhotsk Sea Plate consists of ~10‐km‐thick granitic layer and ~15‐km‐thick basaltic layer (Verzhbitsky & Kononov, ). New 3D seismic density modeling of central Okhotsk Sea Plate show typical continental crust structure with 4‐ to 8‐km‐thick basaltic lower crust, 4‐ to 8‐km‐thick middle crust, 10‐ to 15‐km‐thick acoustic folded basement, and 2‐to 4‐km sedimentary sequence (Piskarev et al, ).…”

Section: Introductionmentioning

confidence: 99%

Timing of Okhotsk Sea Plate Collision With Eurasia Plate: Zircon U‐Pb Age Constraints From the Sakhalin Island, Russian Far East

et al. 2018

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The Late Mesozoic to Cenozoic evolution of Northeast Asia involves successive subduction of the Pacific oceanic crust and amalgamation of the Eurasia, North American, and Okhotsk Sea Plates. The timing of plate collision is essential for understanding the tectonic evolution of Northeast Asia. In this study, we focus on the Okhotsk Sea Plate collision with the Eurasia Plate along the Sakhalin Island, Russian Far East, which is a highly controversial problem, especially about the timing of collision. In order to determine exact timing for this collision, we report zircon U‐Pb data from both the East Sakhalin accretionary complex and postcollisional granitic plutons in the Sakhalin Island. Detrital zircon data from four metasedimentary rocks show that the Sikhote‐Alin orogenic belt is the main provenance for the East Sakhalin accretionary complex. Meanwhile, the youngest detrital zircon age constrains the maximum depositional age of East Sakhalin accretionary complex later than 49 Ma. Both Langeri and Val'za plutons are made of peraluminous S‐type granite. Four granitic samples yielded consistent ages at 36–38 Ma, indicating that both plutons were emplaced at the middle Eocene. Their generation is considered to have been derived through crustal anatexis of accretionary wedge in the lower crust shortly after tectonic thickening caused by the Okhotsk Sea Plate collision with the Eurasia Plate. Consequently, our age data constrain that the Okhotsk Sea Plate and Eurasia Plate collision occurred in the middle Eocene between 49 and 38 Ma. This age range is consistent with late Eocene uncomformity identified in the Sakhalin Island and Okhotsk Sea.

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Section: Introductionmentioning

confidence: 99%

Timing of Okhotsk Sea Plate Collision With Eurasia Plate: Zircon U‐Pb Age Constraints From the Sakhalin Island, Russian Far East

et al. 2018

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“…Its basement has been considered as a continental crust 40 – 42 or a complex accretionary structure of the Eurasian Plate after the oceanic crust stopped subducting. The age of the Okhotsk Sea basement is estimated ~ 65 Ma (Cretaceous–Paleocene boundary) 41 and older (~ 200 Ma) 40 . The basement consists of metabasaltic, metadioritic, granite-metamorphic and sedimentary-volcanogenic layers with total thickness around 25–30 km 40 .…”

Section: Discussionmentioning

confidence: 99%

Cretaceous to early Paleogene sediment provenance transition from continental to magmatic arc systems in the Northwestern Pacific Region

Harisma,

Niki,

Hirata

et al. 2024

Sci Rep

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Unraveling the Paleo-Kuril Arc's origins is key to understanding northwest Pacific tectonics. The Paleo-Kuril Arc is viewed as an intraoceanic arc from trench subduction between the Izanagi and Pacific Plates. Alternatively, several studies suggest the Paleo-Kuril Arc as a continental magmatic arc, hypothesizing the existence of a mid-oceanic ridge and Paleogene subduction, placing the Paleo-Kuril Arc near the Okhotsk Block's southern edge. This study clarifies these hypotheses, previously clouded by limited geochronological data on deposits in the Paleo-Kuril Arc. We conducted U–Pb dating to examine the origins of detrital zircons from the Cretaceous–Paleogene Tokoro and Nemuro Belts of the Paleo-Kuril Arc. Cluster analysis, merging new and existing data, identified two unique detrital zircon age clusters. The abundance of Precambrian zircons in Cretaceous–Paleocene Paleo-Kuril Arc sandstones (Type 1 Cluster) suggests a continental magmatic origin, supporting the ridge subduction model. However, an early Eocene shift to a consistent local volcanic source (Type 2 Cluster) highlights a significant provenance change. This geochronological evidence, indicating a separation from continental sources, calls for further research to decode the simultaneous development of sediment sources in different geological belts, potentially tied to the ridge subduction event.

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“…A geophysical study by Den and Hotta (1973) proposed that the Okhotsk Block (the Kamchatka Peninsula, the Okhotsk Sea, the Sakhalin, and the eastern part of Hokkaido) is a continental plate in the central and northern parts of the Okhotsk Sea. In addition, Verzhbitsky and Kononov (2006) conducted a geophysical study in the Central Okhotsk Rise region, also revealing that the Okhotsk Block is composed of the continental plate. They estimated that it consists of granitic and basaltic layers about 10-km and 15-km thick, respectively.…”

Section: Plate Tectonic Frameworkmentioning

confidence: 99%

The Origin of the Paleo‐Kuril Arc, NE Japan: Sediment Provenance Change and Its Implications for Plate Configuration in the NW Pacific Region Since the Late Cretaceous

et al. 2022

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The Nemuro Belt is a tectonic belt in the Paleo‐Kuril Arc system, the NW Pacific region. The Paleo‐Kuril Arc has been interpreted as an intraoceanic arc system between the Izanagi and Pacific Plates during the Late Cretaceous, suggesting that the boundary between these plates was a trench. However, this study shows it was a volcanic arc that developed atop a continental margin. To determine the nature of this arc during the Late Cretaceous, U‐Pb ages of detrital zircons from the Nemuro and Urahoro Groups in the Paleo‐Kuril Arc were analyzed. Our results identify two distinct types of detrital zircon U‐Pb age distributions. The first (Type 1) is characterized by multimodal age distributions with peaks ranging from ca. 1.8 Ga to 78 Ma. The other (Type 2) exhibits a unimodal age distribution with a peak at 60‐52 Ma. These different age distributions indicate a provenance transition occurred between the Late Cretaceous and Paleogene. Precambrian zircons in Type 1 sandstones indicate that the Paleo‐Kuril Arc was part of a continental plate, presumably the Okhotsk Block, in NE Asia during the Late Cretaceous. In contrast, Type 2 sandstones were supplied only from the magmatic arc region that the Izanagi‐Pacific Ridge subduction could have activated. This provenance transition suggests the initially continental arc became separated from its continental source at the beginning of the Paleogene.

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Geodynamic evolution of the lithosphere of the Sea of Okhotsk region from geophysical data

Cited by 9 publications

References 8 publications

Timing of Okhotsk Sea Plate Collision With Eurasia Plate: Zircon U‐Pb Age Constraints From the Sakhalin Island, Russian Far East

Timing of Okhotsk Sea Plate Collision With Eurasia Plate: Zircon U‐Pb Age Constraints From the Sakhalin Island, Russian Far East

Cretaceous to early Paleogene sediment provenance transition from continental to magmatic arc systems in the Northwestern Pacific Region

The Origin of the Paleo‐Kuril Arc, NE Japan: Sediment Provenance Change and Its Implications for Plate Configuration in the NW Pacific Region Since the Late Cretaceous

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