Late Jurassic Margin of Laurasia–A Record of Faulting Accommodating Plate Rotation
Paleomagnetism and geochemistry of the Kiselevka block of the Kiselevka-Manoma terrane (northern Sikhote-Alin): Geodynamic significance
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Published:December 01, 2015
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CiteCitation
Alexander I. Khanchuk, Alexei N. Didenko, Anna I. Tikhomirova, Irina P. Voinova, 2015. "Paleomagnetism and geochemistry of the Kiselevka block of the Kiselevka-Manoma terrane (northern Sikhote-Alin): Geodynamic significance", Late Jurassic Margin of Laurasia–A Record of Faulting Accommodating Plate Rotation, Thomas H. Anderson, Alexei N. Didenko, Cari L. Johnson, Alexander I. Khanchuk, James H. MacDonald, Jr.
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We present a comprehensive study of one of the key targets of the Sikhote-Alin orogen—Early Cretaceous rocks in the Kiselevka block of the Kiselevka-Manoma tectono-stratigraphic terrane. The characteristic component of natural remanent magnetization (NRM) for these rocks was isolated, and the fold test was positive (Dec = 275.8°, Inc = −33.8°, K = 33.3. α 95 = 8.0°). The paleolatitude along which rocks of the block were forming in the Early Cretaceous was defined by the direction of this component (paleolatitude 18°N ± 5°N) as well as coordinates of the paleomagnetic pole (Plat = 18.6°, Plong = 222.4°, with semi-axis of the ellipse of confidence limit dp = 5.2° and dm = 9.1° of the Kiselevka block. The geochemical composition of volcanic rocks in the block suggests that they formed in a within-plate oceanic environment like volcanic rocks of the Hawaii hotspot.
Three paleoreconstructions were developed based on the newly received and published data, in accordance with which the Kiselevka block: (1) in the range of 135–105 Ma was moving on the Izanagi plate northwestward at a rate of 15–20 cm/yr up to the eastern edge of Eurasia, thus covering over 5000 km; and (2) in the range of 105–70 Ma was moving northward along the Eurasian transform margin within the accretionary complex fragment at a rate of 4–5 cm/yr to its current position (Lower Amur) as part of the Sikhote-Alin orogen.
- accretionary wedges
- Asia
- basalts
- chemical composition
- Commonwealth of Independent States
- continental margin
- Cretaceous
- electron probe data
- Eurasia
- Eurasian Plate
- Hawaiian Plume
- horizontal movements
- hot spots
- igneous rocks
- magnetic minerals
- magnetic properties
- magnetite
- magnetization
- Mesozoic
- natural remanent magnetization
- orogenic belts
- oxides
- Pacific Plate
- paleolatitude
- paleomagnetism
- plate tectonics
- plates
- polar wandering
- pole positions
- Primorye Russian Federation
- remanent magnetization
- Russian Federation
- Sikhote-Alin Range
- tectonics
- terranes
- trace elements
- velocity
- volcanic rocks
- Izanagi Plate
- Kiselevka-Manoma Terrane
- Kiselevka Block