Wang H.,No. 6 Geological Party |
Wang P.,No. 6 Geological Party |
Li J.,No. 6 Geological Party |
Feng J.,Xinjiang Bureau of Geology and Mineral Exploration and Development |
And 2 more authors.
Geology in China | Year: 2015
The Pobei area in Ruoqiang of Xinjiang has drawn much attention among geologists due to numerous magmatic sulfide nickel deposits discovered in this area. The Poyi deposit is a magmatic sulfide copper nickel ore deposit discovered recently. Due to its low grade ore and lack of high grade rich orebodies, it can not meet the requirements of mineral development. Based on geographic features of mafic-ultramafic rocks on the ntorthern slope, the authors summarized the features of magmatic sulfides already discovered, and made an analysis of favorable ore-forming conditions so as to carry out ore metallogenic prediction. In combination with the comprehensive methods for ore exploration which comprise geography, physical exploration, remote sensing and chemical exploration, the authors made a pretty good progress through practice: the anatectic penetration type Podong Ni deposit was discovered for the first time in Pobei area.
Guo X.,Changan University |
Tang X.,Changan University |
Song Z.,Xinjiang Bureau of Geology and Mineral Exploration and Development |
Gao F.,China Communications Construction Company Ltd.
Advanced Materials Research | Year: 2012
In the case of complete information, it is of great significance that use cubic Bezier curves which used as primitive form standard in graphic system to express the spatial data for data processing and transmission. In the text fonts of map, it is customary to use straight lines and the set of quadratic Bezier curves to describe the glyph outlines,but it is inconvenient in the process because the quadratic Bezier curves are non-standard curves. Based on this situation, in this paper,it is proposed the method of quadratic curves fitting using cubic Bezier curves and derive corresponding computing formula. The method is that remove the characters glyph outlines which are described by curve edges from the font and fit the curve edges with quadratic Bezier curves, finally the curve edges are fitted by cubic Bezier curves segment by segment. Through the result of the experiment, it proves that the differences between fitted cubic Bezier curves and quadratic Bezier curves to be fitted are small. The text graphics curves expressed by the method represent the geographical features effectively and provide an effective way of the transformation from font text to the map text. © (2012) Trans Tech Publications, Switzerland.
Zhuang D.-Z.,Xinjiang Bureau of Geology and Mineral Exploration and Development |
Yang W.-Z.,Xinjiang Institute of Geological Survey
Geological Bulletin of China | Year: 2010
Zankan iron deposit is located in Tashikuergan block, controlled by middle-deep metamorphite of Paleoproterozoic, and has obvious regional aero-magnetic anomalies and geochemical anomalies. On the basis of the predicting model of the integrated information of Zankan Iron deposit, and integrating regional geological, aero-magnetic, and geochemical information, the exploration targets of Zankan, Subashi and Tizinafu are given, thus has defined Zankan-Subashi iron mineralization belt.
Dong L.-H.,Xinjiang Bureau of Geology and Mineral Exploration and Development |
Wang K.-Z.,Xinjiang Geological Survey Academy |
Zhu Z.-X.,Xinjiang Geological Survey Academy |
Zhao T.-Y.,Xinjiang Geological Survey Academy |
And 2 more authors.
Geology in China | Year: 2013
Located in the convergence zone of India plate, TarimSino-Korean paleoplate and Siberia ancient plate, Xinjiang has complicated geological structure. With an analysis of the characteristics of large deformation as a starting point, this paper comprehensively summed up such characteristics of the large -scale deformation structure as its type, size, pattern, material composition, structural order and deformation stage, discussed the control role of the large -scale deformation structure over stratigraphic framework, magmatic activities, metamorphism and deformation, regional tectonic evolution and metallogenesis, and divided the tectonics into 34 large deformation structures. The relationship between the evolution of large-scale deformation structure and the mineralization was tentatively investigated.
Jinggan G.,Changan University |
Jinggan G.,Xian Institute of Geology and Mineral Resources |
Wenyuan L.,Xian Institute of Geology and Mineral Resources |
Chunji X.,China University of Geosciences |
And 5 more authors.
Russian Geology and Geophysics | Year: 2015
The Kalaxiange'er porphyry copper ore belt is situated in the eastern part of the southern Altai of the Central Asian Orogenic Belt and forms part of a broad zone of Cu porphyry mineralization in southern Mongolia, which includes the Oyu Tolgoi ore district and other copper-gold deposits. The copper ore bodies are spatially associated with porphyry intrusions of granodiorite, quartz diorite, quartz syenite, and quartz monzonite and have a polygenetic (polychromous) origin (magmatic porphyry, hydrothermal, and supergene). The mineralized porphyries are characterized by almost identical REE and trace element patterns. The Zr/Hf and Nb/Ta ratios are similar to those of normal granite produced through the evolution of mantle magma. The low initial Sr isotope ratio ISr, varying within a narrow range of values (0.703790-0.704218), corresponds to that of primitive mantle, whereas the εNd(T) value of porphyry varies from 5.8 to 8.4 and is similar to that of MORB. These data testify to the upper-mantle genesis of the parental magmas of ore-bearing porphyry, which were then contaminated with crustal material in an island-arc environment. The isotopic composition of sulfur (unimodal distribution of δ34S with peak values of -2 to -4‰) evidences its deep magmatic origin; the few lower negative δ34S values suggest that part of S was extracted from volcanic deposits later. The isotopic characteristics of Pb testify to its mixed crust-upper-mantle origin. According to SHRIMP U-Pb geochronological data for zircon from granite porphyry and granodiorite porphyry, mineralization at the Xiletekehalasu porphyry Cu deposit formed in two stages: (1) Hercynian "porphyry" stage (375.2 ± 8.7 Ma), expressed as the formation of porphyry with disseminated and vein-disseminated mineralization, and (2) Indosinian stage (217.9 ± 4.2 Ma), expressed as superposed hydrothermal mineralization. The Re-Os isotope data on molybdenite (376.9 ± 2.2 Ma) are the most consistent with the age of primary mineralization at the Xiletekehalasu porphyry Cu deposit, whereas the Ar-Ar isotopic age (230 ± 5 Ma) of K-feldspar-quartz vein corresponds to the stage of hydrothermal mineralization. The results show that mineralization at the Xiletekehalasu porphyry Cu deposit was a multistage process which resulted in the superposition of the Indosinian hydrothermal mineralization on the Hercynian porphyry Cu mineralization. © 2015.