Geological Characteristics And Genesis Of Dongliang Gold Deposit In Eastern Hebei

Eastern Hebei is important production base of gold in China. It is located in the shorePaleoasian Ocean and western Pacific two tectonic metallogenic domain superposition areas. It hascontinental marginal ore-forming characteristics, through the archean rope rope-Paleozoic orogenyfor many times, the main metallogenic period was centred in the Mesozoic, more reflected in theyanshanian mineralization and craton plate in orogenic belts edge metallogenic characteristics.Dogliang gold deposit belongs to the Jingchangyu-Yuerya mineralization concentrated area hasEastern Heibei mainly large and medium-sized gold orebodies, the ore bodies are located in archeanmetamorphic body or near archean metamorphic, but the mineralization in the Mesozoic. It is differwith South Africa, Canada-granite greenstone belt gold deposits of age and environmen. Uniquemetallogenic background and dynamic conditions, through the study of it can solve the problem ofintraplate orogeny and gold metallogenic mechanism, and also to the prospecting prediction andresource evaluation of far-reaching significance.In this paper based on Dongliang gold deposits as the research object, and collected the maingold deposits of Jingchangyu&Yuerya ore-concentrated area’s geological characteristics, sulfurisotope, lead isotope, Oxygen and hydrogen isotope et al. we analyzed the genesis of Dongliang golddeposit and studied the metallogenic model of Jingchangyu&Yuerya ore-concentrated area. Themain content of its research and explore include:1. Dongliang gold deposit is located in the southeast edge of the Kuangcheng arcuate foldarea. Most ore bodies of the gold deposit occurred in the contacting zone between Yanshannian acidigneous rocks and middle Proterozoic’s Changcheng system and Jixian system carbonate strata.Rhyolitic breccia lava belt and altered rock zone is the main ore body occurrence area, and the orebody’s occurrence, shape and size are strictly controlled by throughout the mining area’s ring faultstructure zone. The main mineralized type is disseminated (block). Based on intersection andoverprinting relationships of veins throughout the deposit, hydrothermal mineralization process atDongliang gold deposit can be divided into four stages:①pyrite-chalcopyrite stage;②pyrite stage;③sulfide-quartz stage;④oxidation stage.2. By sampling of different rocks (ORES) was conducted to analyze the geologicalcharacteristics and the sources of ore forming material in Dongliang mining zone, and the resultsshowed that the ore-forming matters are derived mainly from deep magma and the strata remelted due to the magmatism provided part of mineralized materials. Hydrogen and oxygen isotopesshowed the fluid comes from magma. Dongliang gold deposit the temperature of main ore formingranges from125℃to340℃and the metallogenic depth is about1.5km and under alkalescence andweak reduction conditions. Therefore, it is considered that the Dongliang gold deposit is amesothermal gold deposits with mineralized materials comes from deep magma.3. We collected and analyzed the information of Jingchangyu&Yuerya ore-concentratedarea’s date, draw a conclusion that in the Jingchangyu&Yuerya ore-concentrated area the differentgold deposits have the same source of ore-forming materials. Dongliang gold deposit has onecommon characteristic is that the Metallogenic, source of ore-forming materials with other mineraldeposits. Make the difference between quartz vein type gold depositand altered rock type golddeposit in terms of scale and grade the main reason is differences in surrounding rocks and structuralfracture.4. Sum up metallogenic model of the Jingchangyu&Yuerya ore-concentrated areas. Weconcluded that the tectonic movement in yangshannian is the basic motivation to the have beenforming gold mine. It make the deep-lying matter upwelling and melted rocks under the earth’s crust.In the process of magma rising the hot liquid separated from magma, in the late due to differences insurrounding rocks and structural fracture. Formed the mainly gold deposit of quartz vein type andaltered rock type in the field. Magmatism not only for the formation of gold deposit ore-formingmaterial but also provides a driving force of the hydrothermal migration. Mining, construction, andthe interaction between granite and fluid constituted the "four one" metallogenic model in theregion.