First diamonds from placers in Primorie

Shcheka, S. A.; Ignat’ev, A. V.; Nechaev, Victor P.; Зверева, В. П.

doi:10.1134/s0869591106030064

Cited by 6 publications

(8 citation statements)

References 10 publications

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“…The magmatic activity (K-Ar age = 134.4 ±1.0 Ma; Prikhod'ko et al, 2009) started with volcanic eruptions of the diamond-bearing meymechite-picrite complex (Ivanov et al, 2005;Oktyabr'skii et al, 2010;Prikhod'ko and Petukhova, 2011;Shcheka et al, 2006) that continued from the Jurassic and was followed by mid-Cretaceous plume-related intrusive activity (U-Pb zircon ages = 149-161 and [96][97][98]samples 26,28,and 32;http://testwms.vsegei.ru/geochron_atlas/,in Russian). This was accompanied by S-type collisional granites (Valanginian-Hauterivian) containing methane-rich fluid inclusions (Berdnikov and Karsakov, 1999) and then transitional Sand I-type granites of unclear (transformed?)…”

Section: Southern Far East Russia and Adjacent Regionsmentioning

confidence: 99%

“…A combination of partial melts in the upper slab, a thinned mantle wedge and lower crust, produced a complex suite of arc-type adakites, normal subduction-related rocks (volcanics and granites) and continental-type adakites accordingly. Some plumerelated rocks, like those belonging to the meymechitepicrite complex of Sikhote-Alin (Prikhod'ko and Petukhova, 2011;Prikhod'ko et al, 2009;Shcheka et al, 2006) also formed a part of this suite.…”

Section: Southern Far East Russia and Adjacent Regionsmentioning

confidence: 99%

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The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia

Nechaev

Dai

Sutherland

et al. 2018

Acta Geologica Sinica (Eng)

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this work focuses on one of the critical points of Earth's history when the Solar System passed through the most distant point of its galactic orbit. During this event, Earth may have suffered from maximum extension, associated with its relative proximity to the Sun at that time, followed by long‐term contraction related to its later distancing. This paper is based on generalized data on the Cretaceous evolution of the Earth as a whole and of East Asia in particular. The evidence suggests that major geological processes at this time may be interpreted as transitional changes in the state of Earth. A liquid nature of its core may have reacted to the gravitational and electromagnetic transformations. When the cosmic changes took place at 135–120 Ma, more turbulent flows in the outer core would have favoured the rise of voluminous magmatic plumes and associated fluid flows. These would substantially transform the mantle, crust, hydrosphere, biosphere and atmosphere. In particular, plume‐related melting of overlying subducting slabs and lower continental crust could have initiated numerous adakitic melts that formed the East Asian Adakitic Province. These and associated juvenile events produced numerous metallic ore, coal, gas and oil deposits. The Cretaceous is one of the most significant resource‐producing periods.

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Section: Southern Far East Russia and Adjacent Regionsmentioning

confidence: 99%

Section: Southern Far East Russia and Adjacent Regionsmentioning

confidence: 99%

The Cretaceous Turn of Geological Evolution: Key Evidence from East Asia

Nechaev

Dai

Sutherland

et al. 2018

Acta Geologica Sinica (Eng)

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“…East Asian Adakitic Province is shown after [2]. The distribution of meimechite-picrite complex is suggested basing on the studies by [8][9][10][11]. North Asian Craton Margins: NAE-East Angara, NAP-Patom-Baikal; NAV-Verkhoyansk; Intracontinental sedimentary basins: el-Erlian, hlt-Hailar-Tamsag, ky-Kyongsang, nw-Western Siberia, pki-Ilin'-Tas, sab-South Aldan, sol-Songliao; Terranes: AK-Avekov, KY-Kotel'nyi, KOM-Kolyma-Omolon, KOP-Prikolyma, KOV-Omulevka, NU-Nutesyn, OH-Okhotsk, VE-Velmay; Active continental margins and granite belts: db-Daebo, jh-Jihei, se-Selenga, st-Stanovoy, trb-Trans-Baikalian-Daxinganling; METALLOGENIC BELTS: AR-Ariadny, AY-Allakh-Yun', BD-Bindong, CA-Chara-Aldan, CH-Chybagalakh, DL-Djeltulaksky, DS-Dzid-Selenginskiy, DX-Daxinganling, EM-East Mongolian-Priargunskiy-Deerbugan, GT-Govi-Tamsag, HS-Hartolgoi-Sulinheer, JLL-Jiliaolu, KD-Kondyor-Feklistov, KK-Kitakami, KU-Kular, NB-North Bureya, NC-Nerchinsky, NJ-North Jilin, NS-North Stanovoy, OT-Onon-Turinskiy, PO-Polousny, SM-Samarka, ST-Shilkinsko-Tukuringrskiy, TB-Taebaegsan, TO-Tompo, VI-Verkhne-Ingodinsky, VK-Verkhoyansk, YA-Yana-Adycha, SCS-Sambagawa-Chichibu-Shimanto.…”

Section: Sources Of Data and Methods Of Interpretationmentioning

confidence: 99%

“…In some places, they are associated with meimechite and picrite flows occuring among the Jurassic shales. The ultramafic volcanic rocks of the meimechitepicrite complex bear some microscopic diamonds [25] and probably source fine-crystalline diamonds (carbonado) up to 8 mm in size into the local placer deposits [10] (Figure 5). Intrusive members of the complex commonly occur as small (2-15 km 2 ) elongated bodies differentiated from dunite (in cores) through wehrlite to clinopyroxenite and gabbro that sometimes are cut by syenite and carbonatite [26].…”

Section: Mafic-ultramafic Related Deposits Ariadny Metallogenic Belt ...mentioning

confidence: 99%

“…A combination of partial melts in the upper slab, a thinned mantle wedge, and thickened lower crust, produced a complex suite of arc-type adakites, normal subduction-related rocks (volcanics and granites), and continental-type adakites accordingly [13][14][15][16][17][18][19]. Some plume-related complexes of East Russia, Japan, Northeast China, and Mongolia [8][9][10][11]20] also formed a part of this suite. The more recent tectonic and petrological studies [21][22][23] strongly confirmed this suggestion.…”

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confidence: 99%

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Metallogenic Evolution of Northeast Asia Related to the Cretaceous Turn of Geological Evolution

2022

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This study tests the hypothesis of Cretaceous Turn of Geological Evolution (CTGE). It uses the large dataset on mineral deposits of NE Asia compiled by the US Geological Survey in collaboration with Russian, Mongolian, Korean, and Japanese geological institutions. As predicted, the Triassic–Early Jurassic and Late Cretaceous–Paleogene geodynamic activities in NE Asia were simple, producing a relatively small amount of mineral deposits (94 and 132, respectively). In contrast, the greatly increased geodynamic activity around CTGE produced a huge amount of mineral deposits (288). The Jurassic–Early Cretaceous superplume-related melts were injected into accretionary wedges that formed along the Pacific–Eurasian margins, whereas adakitic and granitic magmas derived from the shallow slab and lower crust were intruded into the huge intracontinental region. The characteristic mineral deposits are represented by the unique Jurassic–Early Cretaceous plume-related Ti-Fe-V (+P + Cr-PGE + Au + diamond) ores. Other CTGE representatives are the porphyry Cu-Mo and Au (+Ag)-vein deposits, which formation, however, continued into the Late Cretaceous–Paleogene epoch. These deposits were generated by the slab- and crust-derived adakitic and granitic melts formed under influence of the expiring superplume and intensifying subduction. The Late Cretaceous–Paleogene epoch is indicated by a decreasing metallogenic activity in general, and an increasing role of subduction-related deposits in particular.

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