Study On Ore Prospecting Potential And Characteristics Of Geochemistry In The Guerga Area Of Eastern Kunlun, Xinjiang

The North of east Kunlun Mountains in Xinjiang lies in south of Tarim plate-North China plate and west of orogenic belt of east Kunlun Mountains, belongingto the island-arcs of east Kunlun Mountains on the Paleozoic. Tectonic activitiesare intensive, and the structural framework of the region is controlled by Altunfracture belts,central-Kulun Mountains fracture belts,Muzitage-Jinyuhu fracturebelts. Stratum is well developed from early Proterozoic Jinshuikou Group, andfrom north to south age of stratum varies from old to young. Magmatic activitieswere quite frequent from Proterozoic to Mesozoic, forming a series of intrusiverocks and volcanic rocks.The stratum are consisted of mainly early-Paleozoic Qimantage group in theGuerga, which are overlied by Jurassic System Dameigou formation and TertiaryLulehe formation, including the seven new found ore of Au and Cu. There areadmellite and alkali-feld-spar granite on the late stage of Variscan cycle in the northand east of Guerga, and gabbro on the Yanshanian cycle in centre, and dikes arewidespread. Host structures dominantly are NW-or NE-faults.W,Au,Cu,As,Co contents are all obviously higher than others ,especiallyW ,and Hg content is lower in the stream sediments of Guerga region. Qimantagegroup lies within regional high background and high value zones of Co,Au,As,Sb, and Au,Ag,Cu,Zn,Co,As,Sb,Hg contents are higher than their averagecontents in Guega. In Jurassic System Dameigou formation, Au,Ag,Cu,Zn,Co,Hg contents are higher than their average contents in Guega. The admellite onthe late stage of Variscan cycle lies within high background and high valuezones of W,Mo,Bi, and W,Mo,Bi,Pb,Hg contents are higher than others. Thealkali-feld-spar granite on the late stage of Variscan cycle lies within highbackground and high value zones of Sn,Bi, and Sn,Bi contents are higher thanothers. The gabbro on the Yanshanian cycle lies within high background and highvalue zones of Cu,Co, and Co,Cu,Zn,Ag,Bi contents are higher than others . W,Au,Pb,Sn,Co,Bi,Cu,As,Sb,Hg,Ag contents in the rocks arehigher than Xinjiang,particularly W,Au,Pb,Sn,Co,Bi,Cu, W best. W,Sn,Mo,Bi ,Pb,Cu contents are obviously higher than others in the alkali-field-spargranite on the late stage of Vatican cycle. W,Au contents are obviously higher thanothers in the admellite on the late stage of Variscan cycle . As,Sb contents arehigher than others in Qimantage group. Co,Cu,Ag,Sn,Au contents are higherthan others in the gabbro on the Yanshanian cycle. Enrichment regularity of trace elements is that Au,As,Sb,Mo,Bi,W,Sn,Hg,Ag,Pb,Zn contents in the rocks are higher than it in stream sediments inGuerga, and Co,Cu contents in the rocks are lower .In the meantime,streamsediment survey is effective, accounting for the geochemical characteristics ofGuerga. Twenty geochemical anomalies had been established in Guerga, Kun-HS-2,Kun-HS-8,Kun-HS-11,Kun-HS-12,Kun-HS-13,Kun-HS-14,Kun-HS-15,Kun-HS-18 related to gold(copper) deposit ,and Kun-HS-1 ,Kun-HS-9 ,Kun-HS-16,Kun-HS-18 related to W or Sn deposit. Stratum, structure, andmagmatic rocks spatially control the distribution of anomalies. Anomalycharacteristics of Kun-HS-12 ,Kun-HS-15 ,Kun-HS-14 ,Kun-HS-1 areadvantageous to prospecting. Rock fragment geochemical surveys were done in Kun-HS-12(Kezile rock-fragment-survey-zone ),Kun-HS-15(Kalaquha rock–fragment-survey-zone).Nineteen composite anomalies are established. In Kun-HS-12, YX-6,YX-10,YX-11,YX-19 are guessed related to mineralizations. Four gold or cupper depositsare found in the YX-6 by geochemical follow-up for anomalies. Fourteencomposite anomalies are established in Kun-HS-15.Kezile golden deposit is foundin the YX-1 by geochemical follow-up for anomalies, and a lot of gold mine clueswere found in Kun-HS-15. Intrusive rocks have abundant W,Sn,Bi from late Caledonian cycle to lateYanshanian cycle. W average contents vary in 10.2×10-6-67.7×10-6 , and theconcentration Clarke values of W vary from 6.8-45.1.Early Proterozoic JinshuikouGroup-crystalline basement has abundant mineral, for example , W,Sn,Cu,Bi,Pb,Zr and so on. W contents vary in 5×10-6-148×10-6, and average contents are27.3×10-6,and the concentration Clarke value of W is 18.2 in Tula. W contents varyin 10×10-6-183×10-6, and average value is 20.5×10-6,and the concentration Clarkevalue of W is 13.7 in Baiganhu. In Ordovician System Qimantage group, Pb,W,Sn,As,Sb,Bi contents are high, and W contents vary in the range of4.4×10-6-48.8×10-6 ,and W average contents are 13.4×10-6, and the concentrationClarke value of W is 8.9.In Silurian Baiganhu formation , W,Bi,As,Sb contentsare high, and W contents vary in the range of 2.4×10-6-19.4×10-6 ,and averagevalue is 9.2×10-6,the concentration Clarke values of W is 6.1. Early Proterozoic Jinshuikou Group -crystalline basement having richore-forming elements, for example, W,Sn,Cu,Bi, particularly W, is the originalsource bed which controls the geochemistry evolvement and metallogenesis of Wby the study on distribution of elements among stratum and magmatite. In themeantime, W,Sn,Bi,Cu high-temperature elements decrease from old stratum tonew stratum, and W,Sn,Bi,Cu,Pb high-temperature elements in the intrusiverocks contents are higher than in the stratum, which W,Sn,Cu,Bi occurred toconcentrate in the process of magma evolvement. The concentration Clarke valueof W varies in the range of 6.1-45.1 , similar to it in the south china and southJiangxi province, and island-arc of east Kunlun Mountains on the Paleozoic is the...