| The Xindigou gold deposit is a greenstone type gold deposit in Daqingshan area. The Daqingshan area is located in the north of guyang-jining fault and qixiayingchayouzhongqi fault, the north margin of North C hina Carton. The orebody is controlled by the strata and fault, which was hosted in Erdaowa Gr of Lower Proterozoic Erathem and invaded by intermediate dike, Mining area was composed of Xindigou orebody, Youlougou orebody, Xiabangou orebody and so on. The mylonite is the most important host rock. Besides the most common minerals there are pyrite, chalcopyrite, galena, sphalerite, magnetite, hematite and limonite, author identifed altaite, hessite, petzite, argentite for the first time in the deposit. The gangue minerals are mainly quartz, feldspar, calcite, sericite, chlorite, epidote and so on.In the occurrence of the gold analyses, the gold-hosting minerals are mainly pyrite and quartz, and minor K-feldspar, sericite, siderite, limonite, tetrahedrite, sphalerite, galena are also identified, which include inclusion, fissure-filling, intergranular and interlocking gold. The gold granularity is mainly characterized by micro extra particulate, micro fine particulate, microscopic medium, and micro particulategrained gold. The gold minerals that contain Ag have the range of the fineness.Geochemical study, the host rock and mineral and magmatic rock have LREE more than HREE, Eu loses significantly, the REE has the right tilt feature, which indicated ore inherited the REE characteristics of host rocks and minerals into the sources of them having origin contacts. The measured δ34S average value of the samples collected in the gold deposit(1.74 ‰) varies in a very limited range, suggesting that the sulfur may be leached from deep origin. The μ values of lead isotope are within the range of the single normal lead evolution(average 9.15), the figure on the lead isotope parameters indicates that measuring points fall in the range of the orogenic belt. Lead isotope is characterized by the source of deep origin. Magmatic zircon dating are 241±3Ma, 312±3Ma, where the dike dating segment formed Triassic era, indicating the ore genesis and Triassic magmatic rocks have a certain relationship.Comprehensive research shows that the Xindigou gold deposit was influenced by regional thermodynamic metamorphism and magmatic activity, ductile brittle shearing action and so on. We attempted to establish a metallogenic model based on the comprehensive study. The study of the thermoelectric characteristics of pyrites, which indicates the Xindigou gold deposit formed in multiple periods and multi-stage overlapped by metamorphic hydrotherm, the formation temperature is medium temperature. In the mineralization process, Youlougou orebody may locate at the bottom, which may has a small- scale extension in deep. Drilling holes ZK106 of Xiaoxigou orebody has a better exploration prospect with large-scale extension, the ZK102 of Xiaoxigou orebody is more potential than ZK2802 of Dahanqing orebody in terms of exploration prospect in deep. |
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