Record of Magmatic Rocks and Related Type of Deposit for Paleozoic and Mesozoic Ocean-Land Transition in Nenjiang-Heihe Area, Heilongjiang Province

The Phanerozoic magmatic activity was strongly in Nenjiang-Heihe area of Heilongjiang Province, a series of large and medium-sized deposits were developed, in order to understand the Paleozoic and Mesozoic ocean-land transition processes and their metallogenic background in the study area, the achievements in magmatic rocks and ore deposits in recent years were systematically summarized, the adakitic rocks, high magnesium rocks and TTG granite, from the interoceanic fore - arc rock assemblage were discussed, in combination with volcanic-sedimentary characteristics, the metallogenic events represented by the ocean-land transition and related deposit types in the study area were discussed. High magnesium rocks of Early Cambrian, Late Cambrian, Middle Ordovician and Early Silurian and adakitic rocks of Early Ordovician, Middle Ordovician and Late Devonian developed in the Paleozoic, in the subduction environment of Nenjiang-Heihe ocean, during the Late Carboniferous-Permian period, it changed to late orogenic-post-orogenic stage, the mineralization was most intensely in Ordovician and was closely related to adakitic rocks and high magnesium rocks from interoceanic fore-arc rock assemblage, the porphyry in the subduction arc-forming stage and the shallow cryogenic hydrothermal metallogenic system appear, and the possible VMS type of deposits, orogenic gold deposits and other ore-prospecting work need to be further strengthened. The Mesozoic development in the study area was related to the southern subduction of the Mongol-Okhorsk oceanic plate in the Middle Triassic, Early Jurassic adakitic rocks and Late Triassic magnesite rocks and Early-middle Jurassic TTG granite, the late Early cretaceous arc volcanic rocks and a series of large and medium-sized gold deposits may be related to the subduction-retreat of the ancient Pacific plate.