Session 06H: Making Granites
No. 3132
Eocene granites in South Sakhalin, Russian Far East: Correlation with the Hokkaido Island
National Taiwan University
Jia-Ping
1 Liao (
[email protected]),
1 Jahn ,
Bor-Ming Igor 1,3 2 1,4 Pan Zhao , Vitaly Ivin , Sun-Lin Chung
1 Department
of Geosciences, National Taiwan University, Taipei, Taiwan 3 Department of Geosciences, University of Tübingen, Tübingen, Germany
2
Far East Geological Institute, Far East Branch, RAS, Vladivostok, Russia 4 Institute of Earth Sciences, Academia Sinica, Taipei 10529, Taiwan
OBJECTIVES
DISCUSSION ISSUES
1. To investigate the nature of crust growth of Sakhalin Island in the Eocene. 2. To date and perform petrogenetic study of the granitic intrusion events. 3. To constrain the tectonic models of South Sakhalin in the Eocene.
❶ Okhotsk and Aniva plutons
1. 2.
Zircon U-Pb dating Geochemical and isotope analyses
South Sakhalin granites: Okhotsk pluton Ozersk terrane Aniva pluton Tonin-Aniva terrane
The Okhotsk pluton (44-42 Ma)
Detrital zircon dating and Hf isotope signatures
1.
Origin of the Ozersk terrane
2.
3.
Comparison: Geochemical and Sr-NdHf isotope characteristics Hokkaido granites: Hidaka terrane
1. Source nature & crust composition 2. Terrane correlation
Far East Geological Institute
2 Alexandrov ,
Okhotsk pluton
Crystal size: small (length 200 μm Oscillatory zoning dominant Abundant inherited zircons (48 to 1800 Ma; mainly 50 to 150 Ma)
Miocene: Active strike-slip movement and rapid clockwise block rotation in response to the opening of the Japan Sea
Major Granitic plutons in Sakhalin
❷ Comparison of granites in South Sakhalin and Hokkaido
TERRAIN RELATIONSHIP WITH HOKKAIDO (1) South Sakhalin: the extension of the Hidaka terrane (Kimura et al., 1992; Nanayama, 1994) (2) South Sakhalin: (Bazhenov, 2001; Zharov, 2005) Ozersk terrane----Tokoro terrane (Tokoro arc) Tonin-Aniva terrane---Hidaka terrane (3) South Sakhalin: (Ueda, 2005; Ueda, 2016) Western part---the extension of the Idonnappu zone Eastern part---the extension of the Hidaka terrane
(2)
(1)
(3)
Okhotsk granites : I-/A-type
❸ Detrital zircon study: the origin of the Ozersk terrrane
Aniva granites : S-type
1. The Ozersk terrane may have more likely situated at the continental margin but not the intraoceanic arc since the early Cretaceous. 2. A significant change in sedimentary sources occurred during the late Cretaceous to the Eocene.
Hidaka (Eocene) granites : I-type Hidaka (Miocene) granites : I-type
Study area:
Okhotsk pluton
Aniva pluton
SAMPLE LOCATION AND PETROGRAPHY
❹ Juvenile crustal growth in South Sakhalin and Hokkaido • Estimate possible proportion of the mantle (juvenile) component involved in the generation of granitoids.
CONCLUSIONS 1.
2. 3.
4.
Granites: Qtz+Plag+K-feld+Hbl+Bio • Graphic texture • Abundant enclaves
Volcanic dike rocks: Rhyolites: SK14-10, SK14-12 Dacite porphyrite: SK14-14
Country Rocks (Volcani-sedimentary Rocks): 1. Kedrov sequence (lower K): tuffeceous sandstone and siltstone 2. Chaika sequence (upper K to Paleocene): tuffeceous sandtone/ marly siltstone
The Okhotsk and Aniva plutons were emplaced from 44 to 40 Ma, and this magmatic period can be correlated to that of Hokkaido Island. The Okhotsk granites (44-42 Ma) possess transitional characteristics between I- and A-type granites. The Aniva granites (41-40 Ma) have typical S-type granite features. The whole-rock Sr-Nd and zircon Hf isotopic signatures suggest that the Okhotsk granites were generated by partial melting of mixed sources rich in juvenile (mantle-derived) components. The geochemical and isotopic characteristics of granitic rocks from the Sakhalin and Hokkaido islands are comparable. The Okhotsk and Aniva granites can find their coeval counterparts in the eastern part and western part of the Hidaka terrane of Hokkaido, which show similar juvenile Sr-Nd-Hf isotopic signatures, respectively. Juvenile crustal growth is clearly demonstrated in Sakhalin and Hokkaido. The mid-Eocene granitic magmatism (44-40 Ma) in Sakhalin is associated with a tectonic transition from subduction to strike-slip tectonics. The retreat of the Pacific plate promoted local extension of the overriding Eurasian plate and lithospheric thinning in South Sakhalin. They further caused mantle underplating and partial melting of the accretionary complexes to generate granitic magmas.
KEY REFERENCES TECTONIC IMPLICATIONS
Bazhenov, M. L., Zharov, A. E., Levashova, N. M., Kodama, K., Bragin, N. Y., Fedorov, P. I., ... & Lyapunov, S. M. (2001). Paleomagnetism of a Late Cretaceous island arc complex from South Sakhalin, East Asia: Convergent boundaries far away from the Asian continental margin?. Journal of Geophysical Research: Solid Earth (1978–2012), 106(B9), 19193-19205.a Jahn, B. M., Usuki, M., Usuki, T., & Chung, S. L. (2014). Generation of Cenozoic granitoids in Hokkaido (Japan): Constraints from zircon geochronology, Sr-Nd-Hf isotopic and geochemical analyses, and implications for crustal growth. American Journal of Science, 314(2), 704-750. Jahn, B. M., Valui, G., Kruk, N., Gonevchuk, V., Usuki, M., & Wu, J. T. (2015). Emplacement ages, geochemical and Sr–Nd–Hf isotopic characterization of Mesozoic to early Cenozoic granitoids of the Sikhote-Alin Orogenic Belt, Russian Far East: Crustal growth and regional tectonic evolution. Journal of Asian Earth Sciences, 111, 872-918. Khanchuk, A. I., Kruk, N. N., Golozubov, V. V., Kovach, V. P., Serov, P. A., Kholodnov, V. V., ... & Kasatkin, S. A. (2013, August). The nature of the continental crust of Sikhote-Alin as evidenced from the Nb isotopy of Rocks of Southern Primorie. In Doklady Earth Sciences (Vol. 451, No. 2, pp. 809-813). Springer US. Kimura, G., Rodzdestvenskiy, V. S., Okumura, K., Melinikov, O., & Okamura, M. (1992). Mode of mixture of oceanic fragments and terrigenous trench fill in an accretionary complex: Example from southern Sakhalin. Tectonophysics, 202(2-4), 361-374. Nanayama, F., Kanamatsu, T., & Fujiwara, Y. (1993). Sedimentary petrology and paleotectonic analysis of the arc—arc junction: the Paleocene Nakanogawa Group in the Hidaka Belt, central Hokkaido, Japan. Palaeogeography, palaeoclimatology, palaeoecology, 105(1-2), 53-69. Owada, M., Yamasaki, T., Osanai, Y., Yoshimoto, K., Hamamoto, T., & Kagami, H. (2006). Poly-metamorphism, anatexis and formation of granitic magma due to intrusion of the Niobetsu complex during Miocene, the Nozuka-dake area, Hidaka metamorphic belt, northern Japan. JOURNAL-GEOLOGICAL SOCIETY OF JAPAN, 112(11), 666-683. Ueda, H. (2016). Hokkaido. In T. Moreno, S. Wallis, T. Kojima, & W. Gibbons (eds.), The Geology of Japan (pp. 201-221). London: Geological Society. Ueda, H., & Miyashita, S. (2005). Tectonic accretion of a subducted intraoceanic remnant arc in Cretaceous Hokkaido, Japan, and implications for evolution of the Pacific northwest. Island Arc, 14(4), 582-598. Valui, G. A., & Moskalenko, E. Y. (2010, November). First data on the isotopes of Sm—Nd and Sr for Cretaceous—Paleogene granitoids of primors’e and some problems of their genesis. In Doklady Earth Sciences (Vol. 435, No. 1, pp. 1511-1514). SP MAIK Nauka/Interperiodica. Weaver, R., Roberts, A. P., Flecker, R., & Macdonald, D. I. (2004). Tertiary geodynamics of Sakhalin (NW Pacific) from anisotropy of magnetic susceptibility fabrics and paleomagnetic data. Tectonophysics, 379(1), 25-42. Zharov, A. E. (2005), South Sakhalin tectonics and geodynamics: A model for the Cretaceous-Paleogene accretion of the East Asian continental margin, Russ. J. Earth. Sci., 7, ES5002, doi:10.2205/2005ES000190. Zhao, P., Jahn, B. M., Alexandrov, I., Liao, J. P., Ivin, V. (2017, in prep.) Geochronological, geochemical and Sr-Nd isotopic study of granites in the central Sakhalin Island (Russian Far East) and its bearing on accretion in northwestern Pacific domain
ACKNOWLEDGMENT Granites and granodiorites: Qtz+K-feld+Plag+BtCrd • Leucogranite • Abundant enclaves
Alkali feldspar Granites: SK1506, SK15-08 • K-feld dominant, few plag. • Granophyric texture
SK15-05b granite
•
Enclave: SK15-05a
We thank National Taiwan University, Institute of Earth Sciences (Academia Sinica, Taiwan), and National Taiwan Normal University for the instrument usage, and the Langfang Laboratory and Peking University for zircon preparation. We acknowledge the financial supports of the Ministry of Science and Technology of Taiwan (MOST 104-2913-M-002-005) and the Russian Foundation for Basic Research (Project No. 15-55-52035). Jia Ping Liao thank the Russian team for participating the field trip to Sakhalin Island and appreciate the laboratory assistance from Prof. Sun-Lin Chung’s team and constructive advice from Masako Usuki, Pan Zhao, Jeremy Wu, and Tadashi Usuki.
