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.
Jinggan G.,Chang'an 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.
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.
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.
Ruan B.,Wuhan University |
Ruan B.,University of Tasmania |
Yu Y.,Wuhan University |
Lv X.,Wuhan University |
And 4 more authors.
Mineralogy and Petrology | Year: 2016
The Hongshishan mafic-ultramafic complex is located in the western Beishan Terrane, NW China, and hosts an economic Ni-Cu deposit. Chromite as accessory mineral from the complex is divided into three types based on its occurrence and morphology. Quantitative electron probe microanalysis (EPMA) have been conducted on the different types of chromites. Type 1 chromite occurs as inclusions within silicate minerals and has relatively homogeneous composition. Type 2 chromite occurs among serpentine, as interstitial phase. Type 3 chromite is zoned and exhibits a sudden change in compositions from core to rim. Type 1 chromite occurs in olivine gabbro and troctolite showing homogeneous composition. This chromite is more likely primary. Interstitial type 2 and zoned type 3 chromite has compositional variation from core to rim and is more likely modified. Abundant inclusions of orthopyroxene, phlogopite and hornblende occur within type 2 and type 3 chromites. The parental melt of type 1 chromite has an estimated composition of 14.5 wt% MgO, 12.3 wt% Al2O3 and 1.9 wt% TiO2 and is characterized by high temperature, picritic affinity, hydrous nature and high Mg and Ti contents. Compositions of chromite and clinopyroxene are distinct from those of Alaskan-type complexes and imply that the subduction-related environment is not reasonable. Post orogenic extension and the early Permian mantle plume are responsible for the emplacement of mafic-ultramafic complexes in the Beishan Terrane. The cores of zoned chromites are classified as ferrous chromite and the rims as ferrian chromite. The formation of ferrian rim involves reaction of ferrous chromite, forsterite and magnetite to produce ferrian chromite and chlorite, or alternaively, the rim can be simply envisioned as the result of external addition of magnetite in solution to the already formed ferrous chromite. © 2016 Springer-Verlag Wien
Li Y.-J.,Chang'an University |
Hu K.-L.,Xinjiang Bureau of Geology and Mineral Exploration and Development |
Zhou J.-B.,Xinjiang Bureau of Geology and Mineral Exploration and Development |
Tong L.-L.,Chang'an University |
Tong L.-M.,Xinjiang Bureau of Geology and Mineral Exploration and Development
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010
The volcanic rock assemblage of Dahalajunshan Formation is island arc calc-alkaline sodic volcanic rocks formed at plate convergent margins. The distribution of the volcanic rocks coincides with the anomaly of Au-Cu. All the gold-copper ore spots and mineralization spots in this area are volcanic rock-hosted of Dahalajunshan volcanic rocks, which show favorable ore-forming condition of gold-copper deposits. The gold mineralization is hosted in volcanic rocks mostly, and the epithermal gold deposit is the most significant type in this region. The Kulesayi porphyry is calc-alkaline hypabyssal rock, whose average SiO2 is 57.06%-70.74%, and they are rich in Al2O3, Na2O, Sr and LREE, poor in MgO, Y, Yb and very poor in HREE. With their Na2O/K2O of more than 1, Sr/Y of 57.67, and positive anomaly of Eu, they have characters of O-type adakite. The Kulesayi porphyry coincides with anomaly of Mo. Molybedenun deposit with good prospects for further exploration has been found here. The Kulesayi porphyry and Dahalajunshan volcanic rocks compose the assemblage of island arc volcanic rocks in Early Carboniferous, which enriches the tectonic rock association in this region, and is important for the geotectonic evolution study, regional metallogenic law exploration, and prospecting for the gold-copper deposit (relative to island arc volcanic rocks) and copper-molybedenun deposit (relative to adakite).
Guo X.,Chang'an University |
Tang X.,Chang'an 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.