Time filter

Source Type

Xu S.,Jilin University | Wang M.,Jilin Nonferrous Metal Geological Exploration Bureau | Liu C.C.,Liaoning Survey Academy of Geology and Mineral Resources | Li S.Y.,Jilin University
Applied Mechanics and Materials

89 Au geochemical anomalies are delineated by using 1/200000 regional geochemical exploration data. By researching regional geochemical characteristics and the relationship with the geological background, the author points out that: the main factors causing high background of Au geochemical anomalies are Gaixian and Dashiqiao formation of Liaohe group, intrusions of Mesozoic intermediate-acid intrusive rocks. The elements combination types of typical anomalies are determined by using factorial analysis,cluster analysis and other mathematical methods with the combination of elements association in typical anomalies:the composite anomaly of Baiyun gold deposits is Au-As-Sb, Maoling gold deposit is Au-As-Bi-Mo, Wulong gold deposits is Au-As-Bi-W, Xiaotongjiapuzi gold deposit is Au-As-Bi-Mo-Sb. By using multivariate statistical analysis method,62 ore-caused anomaly are preferred in 89 Au geochemical anomalies delineated. On this basis, the 62 anomalies are divided into 4 kinds of anomaly types reference to elements combination types of typical anomalies,the classification results of ore-caused anomalies are: 4 geochemical anomalies of Baiyun type,36 geochemical anomalies of Maoling type,11 geochemical anomalies of Wulong type, 11 geochemical anomalies of Xiaotongjapuzi type. According to the results, the prospecting direction is provided for the future of gold exploration. © (2014) Trans Tech Publications, Switzerland. Source

Zhang J.,Jilin University | Li S.-Y.,Jilin University | Xu S.,Jilin University | Liu C.-C.,Liaoning Survey Academy of Geology and Mineral Resources | Zhou Y.-H.,Shenyang Institute of Geology and Mineral Resources
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

Firstly, the spatial database of Jinzhou-Fuxin gold metallogenic belt was set on the basis of the previous geological, mineral, geophysical and geochemical materials. Then, the regional gold prospecting model of the study area was built. The main prospecting criteria include Archean metamorphic formation, the NE-EW-trending ductile shear belt, the NE-NNE-NW-trending fracture, the Au-Ag-Cu-Zn geochemical anomaly, the gold heavy sand anomaly, the aeromagnetic (ΔT) anomaly zone from 50 nT to 150 nT and the discovered gold deposit. According to the criteria, the predictive variables (evidence factors) were established and the gold potential of the study area with weighting of evidence based on MRAS was evaluated. Finally, the posterior probability (P) of every 2 km×2 km grid unit was calculated and the study area was classified into A, B or C level prospecting areas. The results show that there are 19 prospecting targets circled according to the distribution characteristics of prospecting areas, including 3 A-level targets, 6 B-level targets and 10 C-level targets. Source

Zhenjun S.,Beijing Institute of Technology | Zhenjun S.,Geophysical Research Institute of Jilin Province | Guosheng S.,Jilin University | Henan Y.,Beijing Institute of Technology | And 6 more authors.
Acta Geologica Sinica

Discovered and mined in recent years, the Jinchangliang gold deposit has not yet been studied in its genetic type. In this paper, the geological features of ore deposit, S isotopic composition, metallogenic age and elements geochemical of the granite closely related to mineralization were discussed. The results of the geological features of ore deposit and S isotopic composition show that ore-bearing hydrothermal solution was closely related with the intrusion of magmatic. The granite is characteristic of high silica SiO2=72.38%-72.98%, high aluminum and Al2O3=14.22%-14.35%, low calcium CaO=0.16% -0.26%, and low value of FeOT/MgO (6.86-7.73), and rich in alkalis Na2O+K2O=9.11%-9.24%, suggesting that it is high-K calc-alkaline, highly fractionated, weak aluminum A-type granite. The REE patterns are inclined to right and show intense fractionation between LREE and HREE, without obvious negative Eu anomaly (δEu=0.80-0.84). The primitive mantle-normalized spidergrams are characterized by depletion of Ba, U, Ta, Nb, Zr, Ti and P, which implies that the granite has the characteristics of the crust-mantle mixing. S isotopes also indicate that the material source of gold deposit is closely related to the granite rocks. The LA-ICP-MS Zircon U-Pb age of the Damiao rock mass medium-fine grained monzogranite (belonging to the early Indo-China) is (245±1) Ma. It shows that Jinchangliang gold deposit was not formed in Yanshanian, but the early Indo-China. Specifically speaking, the deposit was formed in the collision stage of the North China plate and the Siberian plate. © 2015 Geological Society of China. Source

Zhang J.,Jilin University | Li S.-Y.,Jilin University | Xu S.,Jilin University | Liu C.-C.,Liaoning Survey Academy of Geology and Mineral Resources | Zhou Y.-H.,Shenyang Institute of Geology and Mineral Resources
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition)

Jianping-Baoguolao gold metallogenic belt in western Liaoning Province is hosted in Archean metamorphic formation which has big gold potential and 127 gold deposits have been discovered so far. A gold prospecting breakthrough is needed to meet the growing gold exploitation. At first, a spatial database of Jianping-Baoguolao gold metallogenic belt has been established based on previous works of geology, mineral resources, geophysics and geochemistry. Then, a regional gold prospecting model has been set up for the study area with the main prospecting criteria as Archean metamorphic formation, Mesozoic intermediate-felsic intrusions, EW-NE-NNE-NW fractures, Au-Ag-Cu-Pb-Zn-Mo geochemical anomalies, Au heavy sand anomaly and known gold deposits. Thirdly, based on GIS and using the mineral deposit comprehensive forecasting model in MRAS to evaluate the mineral resources of the study area Finally, twelve ore-prospecting target areas have been circled, which are further divided into A-B-C three levels based on their mineralization possibilities with A-level ore-prospecting areas of seven, B-level of four and C level of one. Source

Zhao W.-J.,China University of Geosciences | Zhao W.-J.,Liaoning Survey Academy of Geology and Mineral Resources | Yuan W.-M.,China University of Geosciences | Liu H.-T.,China University of Geosciences | Song G.,China University of Geosciences
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology

This work engages apatite fission track evidences on thermotectonic history, rock uplift rate, denudation extent in southeastern Altai region. Fission track ages of 14 samples range from (59.4±5.8) Ma to (109.7±8.1) Ma and the length is between (12.0±2.5) μm and (13.7±1.5) μm. Thermal modeling reveals that the samples have a three-stage of uplift-cooling history. The first stage is in an overall initial uplift before 108 Ma, the second stage from 108 Ma to 28 Ma experiences a slow cooling phase, and the last stage through a rapid-cooling process since 28 Ma with a cooling rate 1.25-1.61°C/Ma and denudation amount 1.17-1.50 km, the fast exhumation period in the area. The sample ages could be divided into 4 age groups, reflecting multiple tectonic events with different uplift rates. The paleotopography altitude changes from 3895 m to 821 m, 2250 m to 762 m etc., and the amplitude of changes reaches to 3300-1400 m since 90 Ma. The phenomenon of Alpine turning to valley and valley uplifting is visible in the studied area, indicating various stages of paleotopography. Based on inversion of ancient landform and equilibrium correction, the equilibrium rebound would play an important role in the rock uplift during the Altai post-orogenic period. Source

Discover hidden collaborations