No. 706 Geological Party

Altay, China

No. 706 Geological Party

Altay, China

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Zhang D.Y.,Hefei University of Technology | Zhang D.Y.,Xinjiang Institute of Ecology and Geography | Zhou T.F.,Hefei University of Technology | Yuan F.,Hefei University of Technology | And 5 more authors.
Acta Petrologica Sinica | Year: 2015

The Sawuer area is located in the north part of the West Junggar region, which is characterized by the outcrops of the Devonian-Carboniferous pyroclastic sedimentary strata. In this study, the authors focused on the basaltic andesite from Tiepuke district, Southwest Sawuer area. The basaltic andesite strata are E-W trending, and there are some post-volcanism granite porphyry intruding nto the basaltic andesite strata. After detailed geological mapping, the basaltic andesite was dated as 427.6 ± 4.2 Ma with the LA-ICPMS U-Pb dating method, and the granite porphyry inserting in the Tiepuke basaltic andesite strata intruded at 387.2 ± 2.9 Ma. The dating results suggest that basaltic andesite from Tiepuke district was erupted is Early Paleozoic magmatism. This is the first time to report the discovery of the Early Paleozoic magmatism in the Sawuer area, which change the traditional understanding that there is no Early Paleozoic magmatism in Sawuer area. The basaltic andesite from Tiepuke district, comparing with the spatial and temporal distribution characters of the magmatism from the adjacent Tarbaghatai and Xiemisitai area, indicate that the Early Paleozoic magmatism in Sawuer may formed in the consistent background within Tarbaghatai-Sawuer-Xiemisitai setting, Northewest Junggar area.


Deng Y.-F.,Hefei University of Technology | Deng Y.-F.,Xinjiang Institute of Ecology and Geography | Yuan F.,Hefei University of Technology | Yuan F.,Xinjiang Institute of Ecology and Geography | And 7 more authors.
Journal of Asian Earth Sciences | Year: 2015

New U-Pb zircon ages and geochemical data including whole rock major and trace element concentrations, PGE and radiogenic isotopes are used to investigate the magma evolution processes and the sulfide saturation history of the Ural-Alaskan type Tuerkubantao mafic-ultramafic intrusion in southern Altai orogen. The Tuerkubantao intrusion consists of dunite, wehrlite, olivine pyroxenite, gabbro and diorite. Igneous zircons from a gabbro in the intrusion yielded a LA-ICP-MS U-Pb age of 370.3±4.8Ma, indicating that the intrusion was emplaced in the Late Devonian. The intrusive rocks are characterized by enrichment of large ion lithophile elements and depleted high field strength elements relative to N-MORB, which is similar to the Devonian Ural-Alaskan type intrusions in southern Altai orogen and different from Devonian volcanic rocks from ophiolites in West Junggar. The Tuerkubantao intrusive rocks have restricted (87Sr/86Sr)t ratios (0.70396-0.70453) and a large range of εNd(t) (-2.84 to +3.80). The trace elements and isotope compositions are comparable with those of the volcanic rocks along the Pacific margins of the Americas. The calculated parental magma of the Tuerkubantao rocks has a high-Mg basaltic composition with ~9.12wt% MgO and ~7.02wt% FeOT. It is proposed that the primary magma was generated from partial melting of metasomatized lithospheric mantle triggered by upwelling of asthenosphere at an active continental margin. The Cu/Pd ratios in gabbros (9.26×105-32.8×105) are obviously higher than those of the wehrlites (1.18×104-1.95×104), indicating that gabbros in the intrusion have experienced sulfide segregation, whereas sulfide saturation did not occur in the wehrlites. © 2015 Elsevier Ltd.


Jin L.,CAS Institute of Geology and Geophysics | Jin L.,University of Chinese Academy of Sciences | Qin K.,CAS Institute of Geology and Geophysics | Li G.,CAS Institute of Geology and Geophysics | And 3 more authors.
Acta Petrologica Sinica | Year: 2015

Located in the northern Great Xing'an Range, the giant Chalukou Mo deposit has been the largest porphyry Mo deposit so far in China, with the direct superimposed vein-type Zn-Pb ore body on the porphyry Mo mineralization. Major and trace elements compositions in pyrite, sphalerite and galena from different stages at Chalukou deposit are analyzed by EMPA and ICP-MS. Mo is enriched in all sulfides, and other elements in sulfides from different stages do not show regularity, except for the enrichment of Zn, Pb, Mn, Cd, Ga, Ag, Bi in the pyrite of Zn-Pb stage. Mo, Co content of sphalerite and Bi, Cd and Ag content of galena decrease from transitional stage to Zn-Pb stage. They are the consequence of fluid cooing and mixing with meteoric water. The REE patterns of pyrite are characterized by LREE enrichment, HREE depletion, and obvious Eu negative anomalies. These features are similar to those of ore-forming intrusions and wall-rocks. Furthermore, most of the Y/Ho values in pyrite (25.0 ∼ 39.0) strap the wide range of ore-forming intrusions (27.4 ∼38.7). It is suggested that ore-forming material is sourced predominantly from ore-forming intrusions with some contribution from wall-rocks. And the exceptional enrichment of Mo in sulfides is attributed to the deep giant porphyry Mo magmatic-hydrothermal system. Compared to the distal hydrothermal vein-type Zn-Pb deposit in east Qinling-Dabie W-Mo-Pb-Zn district, trace elements compositions of pyrite from proximal vein-type Zn-Pb ore body at Chalukou deposit show higher Mo/Ag-Bi/Sb ratio and Mo/Pb-Sn/Sb ratio. That means high Mo content in shallow sulfides and elevated ratios of some elements of pyrite may provide new clues for prospecting the underlying porphyry Mo mineralization beneath the vein-type Zn-Pb ore body. Compared to other vein-type and porphyry deposits, enrichment of moderate-high temperature elements in sulfides at Chalukou deposit is obvious. In addition, the enrichment of trace element in sulfides from different types of deposits show different features, according to the collected data (porphyry, epithermal, vein-type, skarn, VMS, MVT deposits), and this attempt could indicate a new perspective of distinguishing the ore genetic type.


Geng X.X.,Chinese Academy of Geological Sciences | Chai F.M.,Xinjiang University | Yang F.Q.,Chinese Academy of Geological Sciences | Zuo W.Z.,Polytechnic University of Mozambique | And 3 more authors.
Acta Petrologica Sinica | Year: 2010

LA-ICP-MS U-Pb zircon ages are reported fo mela-rhyolites in the bimodal volcanic rocks from the Altaizhen Formation in Dalawuzi area at the southern margin of Altay orogenic belt. The zircons with well-defined oscillatory zoning from meta-rhyolite sample yielded mean 206Pb/238U ages of 365.6 ± 1.6Ma and 413.5 ± 2.0Ma. The age of 365.6 ± 1.6Ma represent the eruption age of the volcanic rocks of the Altaizhen Formation, which indicated that the Altaizhen Formation was formed during the Middle to Fate Devonian. The age of 413.5 ± 2.0Ma, which are consistent with the eruption age of the Kangbuliebao silicic volcanic rocks and Early Devonian granite, can be inteipreted as an age of captured zircon from Early Devonian magmatism. Geochemically, meta-basalts are rich in titanium, alkali (especially sodium), iron, LILE and LREE and poor in magnesium. They have higher contents of HIFSEs (Nb, Ta, Zr and Hf) than those of typical IAB. Meta-rhyolites are generally characterized by rich silicon, alkali, and poor magnesium. They have relatively high U, Th and rather low Ba, Sr, Ti and P. They display obvious negative anomaly of Nb, Ta and Ti, obvious enrichment of LREE, noticeable negative Eu anomalies (δEu =0.21 ~ 0.41). Basaltic and rhyolilic rocks show similar Pb isotopic data to M-MORB. On the basis of regional geological and geochemical evidences, this paper concludes that the basalt was originated from depleted asthenosphere and subducted material (subducted slab, sediments and fluids), and rhyolite resulted from thermal and the new accretion materials and mingling between basaltic magma and felsic magma. The bimodal volcanic rocks are the products of partial extension after the subduction.


Geng X.,Chinese Academy of Geological Sciences | Yang F.,Chinese Academy of Geological Sciences | Yang J.,Chinese Academy of Geological Sciences | Huang C.,No. 706 Geological Party | And 3 more authors.
Acta Petrologica Sinica | Year: 2010

The Tiemurte middle-size lead-zinc deposit occurs in Kelang basin on the southern margin of Altay and it is an important VMS style. The Tiemurte deposit occurs in second lithological unit of Upper Silurian-Lower Devonian Kangbutiebao Formation, with the host rocks being marble, greenschist, meta-calcareous siltstone and skarn. The ore bodies show bed-like or lenticular. The lead-zinc deposit is subjected to three stages; Sedimentary exhalative stage, superposed rebuilding stage and hypergenesis stage. The inclusions in quartz, feldspar, calcite and garnet are dominantly liquid inclusions type. In addition, the inclusions in quartz including rich gas phase inclusions, single gas inclusions, daughter mineral-bearing inclusions, CO2-bearing three-phase and aqueous two-phase. In sedimentary exhalative stage, homogenization temperatures of inclusions vary from 150°C to 330°C with peak temperature of 165°C and 285°C, the salinity from 4% to 16% NaCl equiv, the density ranges from 0.77g/cm3 to 0.97g/cm3, the cations in inclusions are dominanted by Na+ and K+, the anions are Cl- and SO4 2-and the gases in fluid inclusions are chiefly composed of H2O and CO2. In superposed rebuilding stage, homogenization temperatures are 150-480°C, the salinity is 2.2% to 17.08% NaCl equiv and 33.93% to 47.2% NaCl equiv, the density ranges from 0.61g/cm3to 1.03g/cm3, the cations in inclusions are Na+ and K+, the anions are Cl- and SO 4 2-and the gases in fluid inclusions are chiefly composed of H2O and CO2, the secondary components are N 2, CH4.


Kang J.,No. 706 Geological Party | Liu M.,Chinese Academy of Geological Sciences
Scientia Geologica Sinica | Year: 2011

Located in a rift of the Devonian island arc in the central Asian orogenic belt, the Kelan Basin is the largest basin of the southern Altai Mountains, north Xinjiang. According to our research, the ore deposits in Kelan Basin are of volcanic-sedimentary-exhalative type. Most of the deposits have a similar genesis and formed at the same stage. The deposits show similar features, including similar homogenization temperature and composition of fluid inclusions. The changes in physiochemical conditions were important for ore formation.


Yuan F.,Hefei University of Technology | Zhou T.F.,Hefei University of Technology | Deng Y.F.,Hefei University of Technology | Guo X.J.,No. 706 Geological Party | And 4 more authors.
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2015

Since the 1980s, many new ore deposits (or occurrences) have been found in the Sawuer region of the West Junggar, but the geological characteristics, spatial and temporal distribution, tectonic setting and metallogenic regularity of the deposits are poorly studied, which constraints the further exploration works. This paper summarized metallogenic regularity of the deposits in the Sawuer region based on the research of the ore deposits ( occurrences) in this area, including the Tuerkubantao Cu-Ni ore spot, the Kuoerzhenkuola Au-Cu deposit, the Buerkesidai Au deposit, the Hanzheganeng Cu deposit, the Tasite Au deposit, the Heishantou Au ore spot, the Nalinkla Cu-Mo ore spot. According to the genetic type of ore deposits, the deposits in the Sawuer region can be divided as following: the magmatic Ni-Cu sulfide deposit, the porphyry-epithermal Au-Cu-Mo deposit, and the tectonic-altered rock type Au deposit related to intermediate-acid intrusive rocks. The metallogenic elements mainly include Au and Cu, followed by Cu-Ni and Mo. These deposits were formed in the Middle Devonian, the Early Carboniferous, the Late Carboniferous, and manly concentrated in the Early Carboniferous (354~336Ma). Spatially, the magmatic Ni-Cu sulfide deposits are distributed in the Kekesentao region of the northern Sawuer, the ectonic-altered rock type Au deposits related to intermediate-acid intrusive rocks are distributed in the northern Sawuer region, while the porphyry-epithermal Au-Cu-Mo deposits are located at the southern margin of the Sawuer region. The deposits in this area were formed in Middle Devonian island-arc setting, Early Carboniferous island-arc setting, and Late Carboniferous post-collision environment. The metallogenic regularity implies that the Sawuer region has potential for further prospecting. The mafic-ultramafic intrusion in the Kekesentao region of the northern Sawuer should be regarded as favorable exploration target of magmatic Cu-Ni sulfide deposit. There has potential to further prospecting for porphyry-epithermal Au deposits in the Kuoerzhenkuo-Buerkesidai area. The Late Carboniferous-Early Permian intermediate-acid intrusive rocks in the Sawuer region have potential to further prospecting for porphyry Cu-Mo deposits. The area which developed the Sawuer fault and its secondary fault is favorable exploration target of Au-Cu deposits.


Zhou T.F.,Hefei University of Technology | Yuan F.,Hefei University of Technology | Zhang D.Y.,Hefei University of Technology | Deng Y.F.,Hefei University of Technology | And 4 more authors.
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2015

Taerbahatai-Sawuer district is located in the northwest part of the North Junggar area, where widely distribute granitoid ntrusions. In this study, we focused on the six granitoid intrusions (named as Kezibeiti, Zhebei, Basi, Kamusitai, Axi and Keluke respectively) in Tabei area, west section of the Taerbahatai-Sawuer district. After detailed geological and petrological investigation, these six granitoid intrusions are dated by the zircon LA-ICPMS U-Pb method, and their diagenetic ages are between 343 ~315Ma, which can be subdivided into 3 stages: early stage (343~338Ma); middle stage (328 ~324Ma) and late stage (315Ma). In the early stage, the granitoid intrusions ( Kezibeiti and Zhebei plutons) are diorite, with alkaline peraluminous characters. In the middle stage, the granitoid intrusions (Basi, Kamusitai, and Axi plutons) are granitic diorite, with calc-alkaline-alkaline and metaluminous-peraluminous character. In the late stage, the granitoid intrusion ( Keluke pluton) is granite, with alkaline and peraluminous characters. From the early stage to late stage, the evolution trending of granitoid intrusions Tabei area are higher K, Si content and lower Ca content, their magmatic source are generally crust with some-degree mantle materials; and stronger fractional crystallization and less crustal assimilation. The petrogenetic discriminative indicators shows that the two early-stage plutons are formed within Arc subduction environment (343 ~338Ma) , while other four plutons are emplace with post-collisional environment (328 ~315Ma).


Deng Y.F.,Hefei University of Technology | Zhou T.F.,Hefei University of Technology | Yuan F.,Hefei University of Technology | Du X.W.,No. 706 Geological Party | And 2 more authors.
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2015

The Sawuer region is located at the northeastern margin of the West Junggar, where the Late Paleozoic volcanic and intrusive rocks ( including a few mafic intrusive rocks) are widespread. The geochronology of these magmatic rocks has great significance to constrain the Carboniferous tectonic setting in the West Junggar. This paper discusses the tectonic setting and the genetic mechanism of the Keketuobie intrusion in the Sawuer region and provides the evidence to constrain the Carboniferous tectonic setting in the West Junggar based on the petrography, SHRIMP U-Pb ages of zircons and geochemical compositions of different rock types from the Keketuobie intrusion. The Keketuobie intrusion is made up of medium-coarse grained gabbro, fine grained gabbro and diorite. The veined fine grained gabbro intruded in the medium-coarse grained one and some medium-coarse grained gabbro inclusions occurred in the veined fine grained gabbro. The contact between the medium-coarse grained gabbro and diorite is gradational. These petrographic characteristics indicate that the Keketuobie intrusion was formed from multiple pulses of magma. The early magma formed the medium-coarse grained gabbro and diorite, the later magma emplaced in tectonic fractures of the medium-coarse grained gabbro and formed veined fine grained one. According to SHRIMP U-Pb age analysis results, the crystallization of the fine grained gabbro is 323.2 ± 6.2Ma, corresponding to late Early Carboniferous. The diagenetic age of the Keketuobie intrusion is older than those of ophiolite rocks, island arc volcanic rocks, the intrusive rocks in the porphyry deposits, coeval with the ages of the I-type granites, but clearly earlier than those of the post-collision A-type granites and bimodal volcanic rocks, suggesting the Keketuobie intrusion may be formed in the syn-collosional environment. The correlation of major oxides and the similar trace element partitions of the different rocks suggest that they are resulted from crystallization differentiation of the same primary magma. The petrographic and geochemical features suggest primary magma of the intrusion was produced by interactions between depleted asthenospheric melts and metasomatized lithospheric mantle. The slab break-off might play an important role in the upwelling of asthenospheric mantle.


Zhang H.,University of Science and Technology Beijing | Xu J.,University of Science and Technology Beijing | Cheng X.,University of Science and Technology Beijing | Guo X.,No. 706 Geological Party | And 3 more authors.
Acta Geologica Sinica | Year: 2015

The Talate Pb-Zn deposit, located in the east of the NW-SE extending Devonian Kelan volcanic-sedimentary basin of the southern Altaides, occurs in the metamorphic rock series of the upper second lithological section of the lower Devonian lower Kangbutiebao Formation (D1k1 2). The Pb-Zn orebodies are stratiform and overprinted by late sulfide-quartz veins. Two distinct mineralization periods were identified: a submarine volcanic sedimentary exhalation period and a metamorphic hydrothermal mineralization period. The metamorphic overprinting period can be further divided into two stages: an early stage characterized by bedding-parallel lentoid quartz veins developed in the chlorite schist and leptite of the ore-bearing horizon, and a late stage represented by pyrite-chalcopyrite-quartz veins crosscutting chlorite schist and leptite or the massive Pb-Zn ores. Fluid inclusions in the early metamorphic quartz veins are mainly CO2-H2O-NaCl and carbonic (CO2±CH4±N2) inclusions with minor aqueous inclusions. The CO2-H2O-NaCl inclusions have homogenization temperatures of 294-368° C, Tm,CO2 of -62.6 to -60.5°C, Th,CO2 of 7.7 to 29.6°C (homogenized into liquid), and salinities of 5.5-7.4 wt% NaCl eqv. The carbonic inclusions have Tm,CO2 of -60.1 to -58.5°C, and Th, CO2 of -4.2 to 20.6°C. Fluid inclusions in late sulfide quartz veins are also dominated by CO2-H2O-NaCl and CO2±CH4 inclusions. The CO2-H2O-NaCl inclusions have Th,tot of 142 to 360°C, Tm,CO2 of -66.0 to -56.6°C, Th,CO2 of -6.0 to 29.4°C (homogenized into liquid) and salinities of 2.4-16.5 wt% NaCl eqv. The carbonic inclusions have Tm, CO2 of -61.5 to -57.3°C, and Th, CO2 of -27.0 to 28.7°C. The aqueous inclusions (L-V) have Tm,ice of -9.8 to -1.3°C and Th,tot of 205 to 412°C. The P-T trapping conditions of CO2-rich fluid inclusions (100-370 MPa, 250-368°C) are comparable with the late- to post-regional metamorphism conditions. The CO2-rich fluids, possibly derived from regional metamorphism, were involved in the reworking and metal enrichment of the primary ores. Based on these results, the Talate Pb-Zn deposit is classified as a VMS deposit modified by metamorphic fluids. The massive Pb-Zn ores with banded and breccia structures were developed in the early period of submarine volcanic sedimentary exhalation associated with an extensional subduction-related back-arc basin, and the quartz veins bearing polymetallic sulfides were formed in the late period of metamorphic hydrothermal superimposition related to the Permian-Triassic continental collision. © 2015 Geological Society of China.

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