K-Ar ages and cooling history of the Kaikomagatake granitoid pluton, and their bearing on tectonic evolution of the Akaishi Mountains, central Japan.

興平, 佐藤; 賢, 柴田; 茂, 内海

doi:10.5575/geosoc.95.33

Cited by 25 publications

(43 citation statements)

References 9 publications

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“…The short-lived magmatism here is a remarkable feature in contrast with the long-lasted magmatism in Sikhote-Alin (Fig. 5) and Japanese Islands, a probable southern continuation of Sikhote-Alin before the opening of Sea of Japan, where felsic magmatism began at about 130Ma and continued throughout the entire Cretaceous up to Paleogene (e.g., Sato et al, 1992;Sato et al, 1998b). It is reasonable to consider, therefore, that the Khingan-Okhotsk and Sikhote-Alin belts were essentially different magmatic arcs, rather than juxtaposed arcs derived from a single arc.…”

Section: Tectonic Model and Related Subject: Proposal Ofmentioning

confidence: 67%

Mid–Cretaceous Episodic Magmatism and Tin Mineralization in Khingan‐Okhotsk Volcano–Plutonic Belt, Far East Russia

Sato¹,

Vrublevsky

Rodionov

et al. 2002

Resource Geology

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Age of magmatism and tin mineralization in the Khingan-Okhotsk volcano-plutonic belt, including the Khingan, Badzhal and Komsomolsk tin fields, were reviewed in terms of tectonic history of the continental margin of East Asia. This belt consists mainly of felsic volcanic rocks and granitoids of the reduced type, being free of remarkable geomagnetic anomaly, in contrast with the northern Sikhote-Alin volcano-plutonic belt dominated by oxidized-type rocks and gold mineralization. The northern end of the Khingan-Okhotsk belt near the Sea of Okhotsk, accompanied by positive geomagnetic anomalies, may have been overprinted by magmatism of the Sikhote-Alin belt.Tin-associated magmatism in the Khingan-Okhotsk belt extending over 400 km occurred episodically in a short period (95±10 Ma) in the middle Cretaceous time, which is coeval with the accretion of the Kiselevka-Manoma complex, the youngest accretionary wedge in the eastern margin of the Khingan-Okhotsk accretionary terranes. The episodic magmatism is in contrast with the Cretaceous-Paleogene long-lasted magmatism in Sikhote-Alin, indicating the two belts are essentially different arcs, rather than juxtaposed arcs derived from a single arc. The tin-associated magmatism may have been caused by the subduction of a young and hot back-arc basin, which is inferred from oceanic plate stratigraphy of the coeval accretionary complex and its heavy mineral assemblage of immature volcanic arc provenance. The subduction of the young basin may have resulted in dominance of the reduced-type felsic magmas due to incorporation of carbonaceous sediments within the accretionary complex near the trench. Subsequently, the back-arc basin may have been closed by the oblique collision of the accretionary terranes in Sikhote-Alin, which was subjected to the Late Cretaceous to Paleogene magmatism related to another younger subduction system. These processes could have proceeded under transpressional tectonic regime due to oblique subduction of the paleo-Pacific plates under Eurasian continent.

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Section: Tectonic Model and Related Subject: Proposal Ofmentioning

confidence: 67%

Mid–Cretaceous Episodic Magmatism and Tin Mineralization in Khingan‐Okhotsk Volcano–Plutonic Belt, Far East Russia

Sato¹,

Vrublevsky

Rodionov

et al. 2002

Resource Geology

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“…Rub and Rub (1994) and Ryazantseva et al (1995) reported F-contents of 0.06-0.31 wt% (n=6; average=0.17 wt%) for the older plutons, while 0.02 wt% for the Grodekovo sample. Based on the magnetic susceptibility corroborated with microscopic observations, the older plutons are classified as the ilmenite-series or the reduced-type, while the younger granites as the magnetite-series or the oxidized-type (Ishihara, 1977;Sato et al, 1992). The redox state of the granites appears to be one of the essential factors for the fluorite mineralization (Sato, 1980), as discussed below in 4.3.…”

Section: Age and Character Of Granite Magmatism In Voznesenka Districtmentioning

confidence: 95%

Fluorite Deposits at Voznesenka in the Khanka Massif, Russia: Geology and Age of Mineralization

Sato¹,

Suzuki

Nedachi

et al. 2003

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Abstract:A huge fluorite deposit at Voznesenka in the Khanka massif, Far East Russia is concluded to have formed at ca. 450 Ma in Late Ordovician time based on the K-Ar ages for Li-micas in the fluorite ore and greisenized leucogranite within the deposit. This conclusion is inconsistent with the current view of Devonian mineralization that stemmed from widely scattered whole-rock Rb-Sr isotope data for the heterogeneous leucogranite stocks influenced by strong alteration. The Voznesenka and neighboring fluorite deposits may have formed in Cambrian limestone in relation to the intrusion of the Li-F-rich felsic magma which has a similar chemistry to representative Li-F-rich felsic rocks including topaz granite and ongonite or topaz rhyolite; these rocks may be classified as a specific group of highly fractionated felsic magmas.Biotite granite plutons exposed in the Voznesenka district are divided in age into two groups based on the CHIME age data for zircon, monazite and xenotime: Ordovician and Permian. The Ordovician plutons seem to be coeval to the fluorite deposits and are characterized by F-rich chemistry, reduced nature and association of tin mineralization with the deposition of fluorite and tourmaline. The biotite granite magmas of initially enhanced F contents could have been highly fractionated to form Li-F-rich leucogranite cupolas that provided fluorite deposits within the host limestone. Future prospecting for similar fluorite deposits is to be focused on areas of intersection between Ordovician Li-F-rich granite and Cambrian carbonate sequences.The Permian granite of southeastern margin of the Grodekovo batholith is characterized by lesser F content, oxidized nature and the lack of tin and fluorite mineralization in contrast to the Ordovician granite. The result of Permian age does not support the current view of Silurian age for the batholith and requires overall chronological reinvestigation in connection with the tectonic history of the Khanka massif because the Grodekovo is a representative of Paleozoic batholiths in Primorie.

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“…The late Cretaceous to Paleogene granitoids in the Inner Zone of Southwest Japan (Ishihara, 1990), abbreviated as the SWIN batholith hereafter, which could have been once a continental margin of the Eurasian continent (Kagami et al, 1992;Kutsukake, 1993;Nakajima, 1996), have solidification ages of 101 to 37 Ma (Sato et al, 1992), and an average composition of granodioritemonzogranite, but small masses of mafic rocks ranging in composition from gabbro to quartz diorite occur sporadically in the granitic terrains. Mafic enclaves are common and syn-plutonic dikes can be observed.…”

Section: Introductionmentioning

confidence: 99%

Oxygen isotopic constraints on the geneses of the Cretaceous-Paleogene granitoids in the Inner Zone of Southwest Japan.

Ishihara

Matsuhisa

2002

Bull. Geol. Surv. Japan

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K-Ar ages and cooling history of the Kaikomagatake granitoid pluton, and their bearing on tectonic evolution of the Akaishi Mountains, central Japan.

Cited by 25 publications

References 9 publications

Mid–Cretaceous Episodic Magmatism and Tin Mineralization in Khingan‐Okhotsk Volcano–Plutonic Belt, Far East Russia

Mid–Cretaceous Episodic Magmatism and Tin Mineralization in Khingan‐Okhotsk Volcano–Plutonic Belt, Far East Russia

Fluorite Deposits at Voznesenka in the Khanka Massif, Russia: Geology and Age of Mineralization

Oxygen isotopic constraints on the geneses of the Cretaceous-Paleogene granitoids in the Inner Zone of Southwest Japan.

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