Geological, Geochemical Characteristics Ana Prospecting Of Qiupigou Copper Polymetallic Deposit In Heilonghang

The skarn deposits, an important Au、Mo、Cu、Fe、Sn、W、Pb-Zn ore deposit type, are mainly hosted in contact zone of acidic intrusive body and carbonatite.Qiupigou Cu-ploymetallic deposit is located in Yanshou ore district of the Lesser Xing’an Range-Zhangguangcai Range metallogenic belt which belongs to Songnen block.Most of polymetallic deposits distributed to the Qiupigou rock which has the connection with the early Yanshannian granodiorite, are major of the skarn type in this region.Permian Wudaoling formation continental volcanic rocks, Tumenling formation hornfelsic metasandstone and Yuquan formation thick layer marble could be found in the ore field. The fault structures is growth in the area, and the Permian formed Yuquan-Sandaogang anticline.Qiupigou anticline and the north-east faults are main ore-controlling structures.There are larger-area distribution of north-east intermediate acid intruve rocks, those granites which related with ore deposits are overlapping the Permian.Both wings of the Qiupigou anticline has found3skarn Cu ore bodies,1skarn Fe ore bodies and1high-temperature Mo mineralizing belt.The orebody mainly occurred in the contact zone between granite and marble, then distributed in skarn of hornfelsic sand-slate, intermediate acidic tuff and volcanic rocks secondly.The major ore mineral is chalcopyrite, pyrite, sphalerite, galena, followed by tetrahedrite, bornite, malachite, azurite. gangue mineral include andradite-grossularite, epidote, quartz, calcite. The alteration of country rocks were composed of skarnization, silicification, sericitization and greisenization. Skarnization and silicification are related closely to mineralization Based on analyzing the characters of ore geological, geochemistry, chronology and fluid inclusion, the results show that the major elements (Ca, Ti, Al, Si, et al) are transferring among granite, marble and skarn rocks, and the content of the elements between these rocks exhibits a linear change. The Permain Yuquan formation and Yanshannian granite closely related to mineralization. Syenogranite presenting typical geochemical characteristic of ultraluminum and calc-alkalinerocks (A/CNK=1.26Na2O/K2O=0.93, σ=1.27). The enrichment of Rb, Th, U, Nd, Yb, and depletion in Sr, P, Ti, which is compatible with the geochemical features of subduction magma. The distribution pattern of rare elements are rich in LREE and deficit in HREE, namely it has nonegative Eu abnormalities. Refering to the same REE distribution patterns, we may conclude they have some relation in petrogenesis. The zircon U-Pb dating yields the Pb206/U238ages of184.1±2.2Ma, support that granite formed in Early Jurassic. Qiupigou deposit is latter than184.1±2.2Ma and probadly related to subduction of Paleo-Pacific.It is believed by a comprehensive study that the deep part of the area is potential for Mo ore prospecting. We could catch deep mineralization information with The CSAMT and geoelectric chemistry method, trace and control deep seated orebody. Geophysical and geochemical show that both Ht-2Soil anomaly and Fs-1IP anomaly are the same In the area of Erdao river near Qiupigou rock.The primary Tan’antun formation mid-acidic volcanic rocks, granite and granite porphyry show that there are good geological condition of mineralization and huge ore potential.