34 research outputs found
SINH KHOÁNG PERMI - TRIAS MIỀN BẮC VIỆT NAM
Get PDFPermo-Triassic metalogeny of North Vietnam The Permo-Triassic period in North Vietnam has determined three ore complexes, formed in the different structures: 1/ Cu-Ni-(PGE) and Ti-Fe-V ore complex; 2/ gold-sulfide and 3/ tin-sulfide. The first complex consists of Cu-Ni-(PGE) mineralization associated with differentiated mafic-ultramafic intrusions of various volcano-plutonic types of the Song Da, Song Hien rift zones, and fold belts surrounding the Song Chay Dome. The Cu-Ni-PGE and Ti-Fe-V complexes, temporally corresponding to the two stages of plume magmatic activities: 260 Ma (Song Hien and Song Da) and 250 Ma (Phu Ngu-Lo Gam), similar to the associated ore occurrences of Emeishan LIP in Southwest of China (Limahe, Jang Baoshan, Panzhihua,...). Gold-sulfide ore complexes, including Au-As, Au-Sb, Sb-Hg-Au and Hg-Sb-(Au) types widespread in the Song Da and Song Hien rift zones as well as in Paleozoic Lo Gam and Quang Ninh folded structures. Within these structures, ore distribution in the form of ore nodes: Lang Vai, Lang Neo, Loc Shoa, Khe Chim ... Common features of these ore nodes are similar ore chemistry(Au, Sb, As, Hg) and zonation: Au-As → Au-Sb → As-Sb-Hg → Hg, as well transitional relations between different types of ore: Au-As and Au-Sb, Au-Sb and Sb-Hg (Lang Vai, Lang Neo ore nodes,...). Ages of ore formation of this complex range from 252-229 Ma, and spatial correlation with bimodal volcano - plutonic (basalt - rhyolite, rhyolite - basalt, granite - porphyry) as well as with small granite and gabbro - syenite intrusion, with age variation of about 247 -233 Ma
The Bulka peridotite–gabbro intrusion (West Sayan), a syncollisional type of layered intrusions
No full textIntroduction to special issue on Large Igneous Provinces of Asia, Mantle Plumes and Metallogeny
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The Late Jurassic age and geochemistry of ultramafic-mafic massifs of the Selenga-Stanovoy superterrane (southern framing of the North Asian craton)
No full textCompositions of gabbro intrusions in the Krestovsky zone ( western Baikal region ): A record of plume–suprasubduction mantle interaction
No full textHoạt động magma và sinh khoáng nội mảng miền Bắc Việt Nam
No full text368 tr. : minh hoạ, có màu ; 24 cm
Geochemical features and geodynamic setting of formation of the Lukinda dunite–troctolite–gabbro massif (southeastern framing of the Siberian Platform)
No full textThe Ureg Nuur Pt-bearing volcanoplutonic picrite–basalt association in the Mongolian Altay as evidence for a Cambrian–Ordovician Large Igneous Province
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