Liu C.,China University of Geosciences |
Liu C.,Durham University |
Deng J.F.,China University of Geosciences |
Luo Z.H.,China University of Geosciences |
And 5 more authors.
Yanshi Xuebao/Acta Petrologica Sinica | Year: 2014
The Luming super large molybdenite deposit is a newly discovered Mo deposit with more than 890 thousand tons resource at an average grade of 0.084% in the Lesser Xing'an Range. Here we resolved the debate of the magmatism and associated mineralization of the Luming deposit. This paper reports LA-ICP-MS U-Pb zircon, 40 Ar-39 Ar biotite, and Re-Os molybdenite geochronology of Luming granite porphyry (LGP), and Luming granite (LG). Field relationships show that the emplacement of the LG is succeeded by the LGP. Quartz vein and disseminated molybdenite mineralization occurs in the LGP. The geochronology shows that the LGP was formed at 174.0±2Ma(MSWD=3.2). The five molybdenite samples from Luming deposit yield a Re-Os isochron age of 177.8±2.3Ma (MSWD=0.08) and a Re-Os weighted average age of 177.5±1.2Ma (MSWD=0.06). Ar-Ar systematics indicate LG biotite has an age of 175.9 ± 1.1Ma, this indicates the LG was probably formed at ∼ 176Ma. Considering field geology, petrography, and previous studies, we show the batholiths of LG (>176Ma) was formed prior to the LGP (about 174Ma), and the ore-forming intrusive body of Luming metallogenesis of molybdenite is the LGP, but not the batholiths of LG, even though the metallogenesis of molybdenite is coeval or slightly later than LG and LGP. Geochemical characteristics, especially the highly abundance of MgO, high Sr and low Y and diagrams of texture of LG and LGP show the LG and LGP were formed in VAG of subduction setting. We suggests, during early-middle Early-Jurassic, the studied area developed thickened crust and extensive mantle-crust interaction corresponding to the convergence of Monglia-Okhotsk Sea in the west-north, Rohe and Izanaqi Ocean in the east. After that, the batholiths of LG uplifted rapidly because of delamination and the magma of LGP (including molybdenite and magmatic fluids) coming from deeper crust was intrusived into the batholiths of LG in the shallow crust, and then formed the LGP and the Luming molybdenum deposit. Thus, the authors suggest the Luming molybdenite deposit was formed by post-batholith metallogenesis.
Zhang X.R.,Jilin University |
Zhang X.R.,Key Laboratory for Oil Shale and Coexistent Energy Minerals of Jilin Province |
Zhang X.R.,Key Laboratory for Evolution of Past Life and Environment in Northeast Asia |
Fang S.,Jilin University |
And 4 more authors.
Applied Mechanics and Materials | Year: 2013
The later-period structure of Fuyang oil layer is very complex, and the reservoir mainly consists of river-way sand. The form of the reservoir is narrow and distributed differently, so it is very hard to identify. To accurately predict sand bodies, the sand bodies in the river way are comparatively studied using multiple post-stack seismic attributes, and finally a conclusion is made as follows: the reservoir interpretation technology based on frequency possesses a high spatial resolution and can test the spectrum lateral variation caused by different deposits, and then the plane distributions of the river-way and other deposits are described using equifrequent slices, and the combination characteristics of different deposit rhythmic layers are quantitatively analyzed, and also the thickness change of the river-way can be quantitatively analyzed under the ideal condition. Meanwhile, spectrum imaging is implemented using the tuning frequency of the different thickness of the sand bodies, and the reservoir is identified through the spatial changes of amplitude energy, facies values, and frequency attenuation attributes under the different chosen frequency, so that the spatial discontinuity of the deposits is effectively described. Therefore, it can meet the exploration and development needs of the oil field to a certain extent. © (2013) Trans Tech Publications, Switzerland.
Liu Y.,Jilin University |
Liu Y.,Key Laboratory of Mineral Resources Evaluation in Northeast Asia |
Liu B.,Jilin University |
Liu B.,Key Laboratory of Mineral Resources Evaluation in Northeast Asia |
And 6 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2016
Laodaokou unit is located in Oroqen Autonomous Banner, Inner Mongolia, the east of Xing'an Mongolian orogenic belt, northern Great Xing'an Range. The unit is mainly composed of diorite, adamellite, and dioritic porphyrite. SIMS U-Pb dating of zircon of the diorite provides the age of (126.09±0.95) Ma, indicating that the plution was formed in Early Cretaceous instead of Cambrian as thought before. The major element data show that the diorites contains 56.13%-57.91% of SiO2, 0.97%-0.99% of TiO2, 2.00%-2.12% of MgO, 6.73%-7.41% of TFe2O3, 36.00-38.00 of Mg#, 4.29%-4.53% of Na2O, 1.38%-1.59% of K2O, 17.95%-18.36% of Al2O3. The K2O/Na2O ratios range from 0.31 to 0.37. The diorites are rich in alumina and sodium relatively. The rare earth elements chondrite standardized curves show that they are rich in light REE and depleted of heavy REE with weak negative δEu (0.85-0.87). Laodaokou plution is rich in large ion lithophile element (LILE) (e.g., Ba, K, Rb, Th, U), but depleted of high field strength elements (HFSE) (e. g., Nb, Ta, Ti, and P). The geochemical signatures above imply a characteristic related to subduction, and this suggests that the magmatic source of Laodaokou diorites were from the lithospheric mantle, which was metasomatosed by subduction fluid. Combining with the geochemical characteristics of Laodaokou plution and its regional tectonic settings, we conclude that the plution might be formed under a lithospheric extension after the closure of Mongolia-Okhotsk Ocean. © 2016, Jilin University Press. All right reserved.
Song L.,Wuhan University |
Li Z.,Wuhan University |
Li G.,Heilongjiang Province Institute of Regional Geology Survey |
Li Y.,Heilongjiang Province Institute of Regional Geology Survey |
And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016
Non-stoichiometric α-cordierite glass ceramic doped with H3BO3 and NH4H2PO4 as additives has been fabricated successfully from sandy kaolin as low temperature co-fired ceramics (LTCC) substrate materials. The sintering and crystallization behaviors of the glass–ceramics were investigated by the differential scanning calorimetry, X-ray diffraction, and field emission scanning electron microscope. In addition, various physical properties were characterized, such as dielectric properties, thermal expansion and flexural strength. The results indicated that there was only onefold α-cordierite formed from MgO–Al2O3–SiO2 glasses in the temperature range from 875 to 925 °C. The glass–ceramics could been highly densified at any experimental temperature and they showed excellent properties: low dielectric constants in the range of 5.5–7.5, low dielectric losses in the range of 0.015–0.025, low coefficients of thermal expansion between 1.22–4.32 × 10−6 K−1 and applicable flexural strength at the level from 110 to 145 MPa. All of the performance qualified cordierite glass ceramic to be used as potential LTCC substrate. © 2016 Springer Science+Business Media New York
Wang Y.,Shenyang Institute of Geology and Mineral Resources |
Fu J.,Shenyang Institute of Geology and Mineral Resources |
Yang F.,Shenyang Institute of Geology and Mineral Resources |
Na F.,Shenyang Institute of Geology and Mineral Resources |
And 4 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2015
We present the geochemical characteristics of the Late Paleozoic granitoid in Heilongjiang Nenjiang-Heihe through the study on the different types of granitoid. The isotopic dating results provide three time periods for these granitoids: Early Carboniferous, Late Carboniferous, and Early Permian. The granitoids are rich in silica, potassium, and sodium; and also the rare-earth elements relatively with significant negative Eu anomaly. The trace elements are typically rich in large ion lithophile element (LILE)K, Rb, Th, but poor with high-field-strength element (HFSE) Nb, P, Ti. The existence of granitic mylonite reflects its deformation and metamorphism through tuctile shear. Based on the above, the Carboniferous granitoid experienced a continental margi arc syn-collision; while the Permian granites deformed under a post-orogenesis These two reflects anenvironmental transition from a tectonic collision to an intraplate post-orgenesis, and also the activity history of genesis, convergece, andextension of the Nenjiang-Heihe tectonic belt. ©, 2015, Jilin University Press. All right reserved.