贵州地质
貴州地質
귀주지질
GUIZHOU GEOLOGY
2014年
2期
105-108,146
,共5页
矿床%地球化学%特征%成矿流体%铅锌矿床%贵州
礦床%地毬化學%特徵%成礦流體%鉛鋅礦床%貴州
광상%지구화학%특정%성광류체%연자광상%귀주
Geochemicalcharacter%Metallogenicflow%Lead-zincdeposit%Guizhou
对贵州黔东镇远金堡铅锌矿床碳-氧、硫同位素及流体包裹体温度、盐度地球化学特征研究，方解石和白云石碳同位素在-5.7‰-6.9‰，落在典型的火成碳酸岩区域（-5‰-7‰）；氧同位素在11.2‰12.2‰之间，略高于火成碳酸岩。闪锌矿硫同位素分布集中，在11.5‰14.2‰之间，结合该区域的碳同位素，暗示成矿物质来自于深部地幔或岩浆作用。流体包裹体均一温度在106238℃之间，冰点温度在-1.8-24℃之间，对应的盐度为2.926.1 wt％NaCl eq.，判断该矿床成矿流体属中低温、中高盐度的成矿流体。从闪锌矿流体包裹体均一温度-盐度变化趋势分析，成矿温度及盐度范围变化较大，成矿流体经历了不混溶过程，可能是岩浆热液在降温减压的过程中发生不混溶现象而形成的。结合区域地质条件及矿床地质特征分析研究，认为镇远金堡铅锌矿床成矿热液来源及其可能与岩浆热液有关。
對貴州黔東鎮遠金堡鉛鋅礦床碳-氧、硫同位素及流體包裹體溫度、鹽度地毬化學特徵研究，方解石和白雲石碳同位素在-5.7‰-6.9‰，落在典型的火成碳痠巖區域（-5‰-7‰）；氧同位素在11.2‰12.2‰之間，略高于火成碳痠巖。閃鋅礦硫同位素分佈集中，在11.5‰14.2‰之間，結閤該區域的碳同位素，暗示成礦物質來自于深部地幔或巖漿作用。流體包裹體均一溫度在106238℃之間，冰點溫度在-1.8-24℃之間，對應的鹽度為2.926.1 wt％NaCl eq.，判斷該礦床成礦流體屬中低溫、中高鹽度的成礦流體。從閃鋅礦流體包裹體均一溫度-鹽度變化趨勢分析，成礦溫度及鹽度範圍變化較大，成礦流體經歷瞭不混溶過程，可能是巖漿熱液在降溫減壓的過程中髮生不混溶現象而形成的。結閤區域地質條件及礦床地質特徵分析研究，認為鎮遠金堡鉛鋅礦床成礦熱液來源及其可能與巖漿熱液有關。
대귀주검동진원금보연자광상탄-양、류동위소급류체포과체온도、염도지구화학특정연구，방해석화백운석탄동위소재-5.7‰-6.9‰，락재전형적화성탄산암구역（-5‰-7‰）；양동위소재11.2‰12.2‰지간，략고우화성탄산암。섬자광류동위소분포집중，재11.5‰14.2‰지간，결합해구역적탄동위소，암시성광물질래자우심부지만혹암장작용。류체포과체균일온도재106238℃지간，빙점온도재-1.8-24℃지간，대응적염도위2.926.1 wt％NaCl eq.，판단해광상성광류체속중저온、중고염도적성광류체。종섬자광류체포과체균일온도-염도변화추세분석，성광온도급염도범위변화교대，성광류체경력료불혼용과정，가능시암장열액재강온감압적과정중발생불혼용현상이형성적。결합구역지질조건급광상지질특정분석연구，인위진원금보연자광상성광열액래원급기가능여암장열액유관。
Inthispaper,itdidgeochemicalcharacterstudyforC-O2,sulfurisotopeandflowinclusion temperature on Jinbao lead-zinc deposit in Zhenyuan,the C isotope of calcite and dolomite is -5.7‰ to -6.9‰,the O isotope in the typical igneous carbonate rock area is 11.2‰ to 12.2‰ and higher than igneous carbonate rock.Sulfur isotope in sphalerite is 11.5‰to 14.2‰and distributes intensively.With the C isotope, it’s inferred the metallogenic material comes from deep mantle and magmatism.The flow inclusion temperature is 106°to 238°,the freezing point is -1.8°to 24°and the salinity is 2.9 to 26.1wt%NaCleq.It can be judged the metallogenic flow of this deposit has low-middle temperature and middle-high salinity.By analysis the changing tendency of temperature and salinity,the metallogenic humidity and salinity changes a lot,the flow experienced unmixing process,it maybe caused by the unmixing phenomena when the magmatic hytrothermal decrease the temperature and pressure.By study the regional geologic condition and deposit geologic feature, it’s thought the metallogenic flow source of Jinbao lead-zinc deposit perhaps has relation with magmatic hy-drothermal.
