中文摘要:通过矿物学、岩石学、矿床学、地层学等学科的综合研究证明：宁芜地区中生代中基性岩浆在其上侵和在高位岩浆房就位过程中，同化了基底青龙群灰岩和石膏灰岩；辉石闪长玢岩是早于挥石安山岩的高位侵入体，它是以侵入产状为主的；梅山富矿体是由形成闪长玢岩的岩浆中的铁质分馏、聚合而成，被同化的成分犹如添加剂，促进了这种不混溶成矿流体的形成。下扬子地区中下三叠统青龙群的分布是这一地区与火山岩有关的铁矿、锶矿形成的重要因素。
Abstract:The complexity of the geologic bodies makes it necessary for us to study and observe them from various angles of knowledge. Much evidence acquired from field and indoor petrological, mineralogical and stratigraphic studies show that during the upward intrusion of magma and its cooling in the high-level magma chamber the K-J magma assimilated T anhydrite layer 120 m in thickness and T limestone. Pyroxene diorite-porphyrite formed earlier than the overlying pyroxene andesite, suggesting that during the formation of pyroxene diorite porphyrite its overlying rocks were merely pyroclastic rocks 160m thick, and at some places dioritic magma extruded to form lava. The high-level magma was in a condition of reduced pressure and boiling, which helped the separation of ferruginous substance from the magma and raised its immiscibility. As is demonstrated by many experimental results and natural phenomena. Fe-Otetrahedron itself has the capability of aggregation. Ca2+, SO32-, Sr4+, CO32-, Cl- and F1-provided by assimilated rocks played an important role in the formation of iron and strontium deposits in the Lower Yangtze Valley in that these assimilated elements “drove” ferruginous substance from silicate lattices and rendered hydrothermal solutions enriched in Sr. The author holds the opinion that basement rocks might affect the alkalinity, type and species of igneous rocks and even the distribution of ore deposits, and therefore the theory and mathematic model for studying assimilation and mixing of magma not only contribute to the petrological research but also have practical significance. Basement rocks can either directly serve as the ore source or make up a prerequisite for the separation of ore substances from magma.
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丁毅.1992.宁芜玢岩铁矿成因新论：同化作用、高侵位和铁质聚合[J].矿床地质,11(3):195~202.1992.A New Theory Concerning The Origin Of The Ningwu(Nanjing-Wuhu)Porphyritic Iron Deposits: Assimilation-High-Level Emplacement-Aggre-Gation Of Ferruginous Substance[J].Mineral Deposits11(3):195~202
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