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Luo G.,Wuhan University | Luo G.,Key Laboratory of Tectonics and Petroleum Resources | Wang L.,Wuhan University
Lecture Notes in Electrical Engineering | Year: 2012

This text introduces image morphological method into digital core modeling. Five key morphological functions: Voronoi tessellation, dilation, erosion, opening and closing are interpreted to simulate the forming of sandstone. Morphology methods, cooperating with periodic boundary idea, produce a high-quality artificial sandstone core which resembles a real core not only in the respect of procedures, but also the amazing visual effects and the reservoir analytic parameters similarity. Sequential morph closing operations are applied to simulate the microscopic remaining oil distribution pattern. Future reservoir Lattice-Boltzmann[1] is promising with a firm backup of such perfect digital core. © 2012 Springer-Verlag GmbH.

Hu X.,Wuhan University | Ding Z.,Wuhan University | Yao S.,Wuhan University | Yao S.,Key Laboratory of Tectonics and Petroleum Resources | And 4 more authors.
Geological Journal | Year: 2016

The Great Xing′an and Lesser Xing′an ranges are characterized by immense volumes of Mesozoic granitoids. In this study, we present major and trace element geochemistry, U-Pb geochronology and systematic Sr-Nd-Hf isotopes for the representative samples, in order to constrain their petrogenesis and the tectonic evolution in NE China. The granitoids generally have high SiO2 (66.5-78.8wt.%) and Na2O+K2O (7.0-8.9wt.%) contents and belong to high-K calc-alkaline to shoshonitic series. All of them show enrichment in Rb, Th, U, Pb and light rare earth elements (LREE), and depletion in Nb, Ta, P and Ti. Zircon U-Pb dating suggests that there was continuous magmatism in both the Great Xing′an Range and the Lesser Xing′an Range during the Jurassic-Early Cretaceous interval. Seven Jurassic granitoids have (87Sr/86Sr)i values of 0.704351 to 0.707374, with εNd(t) values of -3.4 to 2.4 and εHf(t) values of 0.8 to 11.3, indicating that they originated from mixed sources involving depleted mantle and pre-existing crustal components. One Early Cretaceous sample yields (87Sr/86Sr)i value of 0.706184, εNd(t) value of 0.6, and εHf(t) values of 7.0 to 8.2, which is in accordance with previous studies and indicates a major juvenile mantle source for the granitoids in this period. In the Jurassic, the magmatism in the Great Xing′an Range was induced by the subduction of the Mongol-Okhotsk Ocean, while the contemporaneous magmatism in the Lesser Xing′an Range was related to the subduction of the Palaeo-Pacific Ocean. In the Early Cretaceous, extensive magmatism in NE China was probably attributed to large-scale lithospheric delamination. © 2016 John Wiley & Sons, Ltd.

Hu X.,Wuhan University | Yao S.,Wuhan University | Yao S.,Key Laboratory of Tectonics and Petroleum Resources | Ding Z.,Wuhan University | He M.,Wuhan University
Mineralium Deposita | Year: 2016

The Tongshan Cu deposit is located in the northern segment of the Great Xing'an Range and represents one of the few early Paleozoic porphyry Cu deposits in northeastern China. The granitic rocks in the Tongshan Cu deposit include concealed granodiorite and exposed tonalite, which yield LA-ICP-MS zircon U–Pb ages of 478 ± 3 Ma and 214 ± 3 Ma, respectively. The granodiorite has relatively high SiO2 (60.5–63.5 wt%) and Sr (596–786 ppm) contents, low Yb (1.21–1.53 ppm) and Y (9.81–13.0 ppm) contents, and initial 87Sr/86Sr ratios (0.7038–0.7040), suggesting adakitic affinity. Combined with its positive εNd(t) values (3.5–5.4), low Mg# values (41–50), and low contents of Cr (18.6–29.0 ppm) and Ni (7.3–9.1 ppm), we propose an origin by partial melting of a juvenile mafic lower crust in a post-collisional setting after the amalgamation of the Erguna and Xing'an Blocks. The tonalite is characterized by high SiO2 (63.1–65.9 wt%) and Al2O3 (16.0–16.3 wt%) contents, low (87Sr/86Sr)i ratios (0.7041–0.7042), positive εNd(t) values (2.6–3.0), along with LILE and LREE enrichments and Nb–Ta–Ti depletions, suggesting an origin by partial melting of juvenile mafic lower crust, coupled with fractional crystallization, in a post-orogenic setting after the collision between the Xing'an and Songnen Blocks. The δD values of ore-forming fluids range from −100 to −93 ‰, and the δ18O values calculated from hydrothermal quartz are between −3 and 10 ‰. The δ34S values of sulfides vary from −2.6 to −1.1 ‰. Field observations, as well as the geochronological and H–O–S isotopic data, suggest that the Cu mineralization at Tongshan was genetically linked with the granodiorite. © 2016 Springer-Verlag Berlin Heidelberg

Hu X.,Wuhan University | Yao S.,Wuhan University | Yao S.,Key Laboratory of Tectonics and Petroleum Resources | He M.,Wuhan University | And 2 more authors.
Acta Geologica Sinica | Year: 2015

Whole-rock geochemical, zircon U-Pb geochronological and Sr-Nd-Hf isotopic data are presented for the Early Cretaceous volcanic rocks from the northern Da Hinggan Mountains. The volcanic rocks generally display high Si02 (73.19-77.68 wt%) and Na20+K20 (6.53-8.98 wt%) contents, with enrichment in Rb, Th, U, Pb and LREE, and depletion in Nb, Ta, P and Ti. Three rhyolite samples, one rhyolite porphyry sample, and one volcanic breccia sample yield weighted mean 206pb/238U ages of 135.1±1.2 Ma, 116.5±1.1 Ma, 121.9±1.0 Ma, 118.1±0.9 Ma and 116.9±1.4 Ma, respectively. All these rocks have moderate (87Sr/86Sr)i values of 0.704912 to 0.705896, slightly negative εNd(t) values of -1.4 to -0.1, and positive em(f) values of 3.7 to 8. Their zircon Hf and whole-rock Nd isotopic model ages range from 594 to 1024 Ma. These results suggest that the Early Cretaceous volcanic rocks were originated from melting of subducted oceanic crust and associated sediments during the closure of the Mongol-Okhotsk Ocean. © 2015 Geological Society of China.

Hu Q.,Key Laboratory of Tectonics and Petroleum Resources | Guo H.,Wuhan University | Lu W.,Key Laboratory of Tectonics and Petroleum Resources | Lu W.,Wuhan University | And 4 more authors.
Journal of Molecular Liquids | Year: 2014

The Raman spectra of aqueous NaCl solutions (0-25.0 mass%) were investigated at temperatures from 273 to 573 K and a pressure of approximately 30 MPa. It was known that the dissolution of NaCl could significantly alter the water structure by changing the relative abundance of fully hydrogen-bonded water (FHW) and partially hydrogen-bonded water (PHW). Specifically, NaCl induced blue shifts of the Raman main peak above 3390 cm- 1(vPHW) at temperatures below 433 K, which could be attributed to the strengthened H2O-Cl-interaction (HCI) and the weakened H2O-H2O interaction (HHI) in the hydration shell of Cl-. The red shifts of vPHWat temperatures above 433 K could be explained by the strengthened HHI and weakened HCI. NaCl also showed contrary effects on Raman intensity ratio of O-H stretching vibration of FHW and PHW below and above the temperature of 513 K, which was due to the further strengthened HHI and weakened HCI in the hydration shell of Cl-, and the intensified ion-ion interaction (III) promoted the formation of ion pairs with rising temperature. The test results also showed a significant decrease of the water structure breaking capability of NaCl with an increasing temperature. The energy change due to the transition from FHW to PHW was determined by Gaussian fitting. It was found that ΔH (kJ·mol- 1), ΔS (J·mol- 1·K- 1) and salinity (C, mass%) were linearly correlated with the following relationships: ΔH = - 0.14C + 7.01, ΔS = - 0.22C + 27.64 (T ≤ 430 ± 9 K, depending on salinity) and ΔH = - 0.35C + 13.43, ΔS = - 0.70C + 42.34 (T > 430 ± 9 K), respectively from 273 to 573 K. © 2014 Elsevier B.V. All rights reserved.

Hu X.,Wuhan University | Ding Z.,Wuhan University | He M.,Wuhan University | Yao S.,Wuhan University | And 4 more authors.
Journal of Asian Earth Sciences | Year: 2014

The Luming porphyry Mo deposit and the Xulaojiugou skarn Pb-Zn deposit are located in the southeast Lesser Xing'an Range, NE China. They are about 15. km apart, and are both related to monzogranite. Mo orebodies in the Luming deposit are hosted within the medium- to fine-grained monzogranite, while Pb-Zn orebodies in the Xulaojiugou deposit are hosted by the contact zone between the medium-grained monzogranite and the marbles of the early Cambrian Qianshan Formation.LA-ICP-MS zircon U-Pb dating of the ore-related monzogranite in the Luming deposit yields crystallization age of 180.7. ±. 1.6. Ma, and the medium-grained and porphyritic monzogranites from the Xulaojiugou deposit yield crystallization ages of 181.2. ±. 1.1. Ma and 179.9. ±. 1.0. Ma, respectively. Analyses of seven molybdenite samples from the Luming deposit display Re-Os isochron age of 177.9. ±. 2.6. Ma. These results indicate that the mineralization in the Luming and Xulaojiugou deposits occurred at about 181-178. Ma. These two deposits are genetically linked and belong to a porphyry-skarn metallogenic system. Combined with the previously reported geochronological data for ore deposits in adjacent areas, we consider that the early Jurassic is an important epoch for Mo and Pb-Zn mineralization in the Lesser Xing'an Range.The monzogranites from the Luming and Xulaojiugou deposits are enriched in and Rb, Th, U, Pb and light rare earth elements (LREEs), and are depleted in Ba, Nb, Ta, P, Ti and Eu. They have positive εHf(t) values of 1.0-4.0 with two-stage Hf model ages (TDM2) of 868-1033Ma. Whole-rock Sr and Nd isotopes show restricted ranges of initial compositions, with (87Sr/86Sr)i between 0.706346 and 0.707384 and εNd(t) between -3.5 and -1.8. These data indicate that their primary magmas originated from the partial melting of a depleted lithospheric mantle which had been metasomatized by subducted slab-derived fluids/melts. The early Jurassic magmatic-metallogenic events in the Lesser Xing'an Range are interpreted as a response to the subduction of the Paleo-Pacific Plate. © 2014 Elsevier Ltd.

Hu X.-L.,Wuhan University | Ding Z.-J.,Wuhan University | He M.-C.,Wuhan University | Yao S.-Z.,Wuhan University | And 4 more authors.
Journal of Geochemical Exploration | Year: 2014

The large-sized Cuihongshan Fe-polymetallic deposit is located in the north segment of the Lesser Xing'an range, NE China. The Fe orebodies are dominantly hosted in the contact zone between the alkali-feldspar granite and the dolomitic crystalline limestones or skarns, whereas the Pb-Zn (Cu) and W-Mo orebodies are mostly hosted in the contact zone between the syenogranite and skarns, as well as within the syenogranite. The alkali-feldspar granite and syenogranite yield zircon U-Pb ages of 491.1±2.4Ma and 199.8±1.8Ma, with εHf(t) values of -3.7 to -1.3 and 2.5 to 3.9, respectively. Both of them are characterized by high SiO2 and Na2O+K2O content, enrichment in Rb, Th, U and Pb, and depletion in Ba, Sr, Nb, Ta, P, Ti and Eu, indicating an A-type affinity. The Re-Os model ages of the molybdenite range from 198.0 to 202.1Ma. These data suggest that the Fe-related alkali-feldspar granite was formed by partial melting of the Mesoproterozoic crust in an extensional setting after the final collision between the Xing'an and Songnen Blocks, while the Pb-Zn (Cu) and W-Mo-related syenogranite was probably generated by crystal fractionation from depleted-mantle-derived magmas, which are products of lithospheric delamination. © 2014 Elsevier B.V.

Ning Z.,Wuhan University | Ning Z.,Key Laboratory of Tectonics and Petroleum Resources | Henderson C.M.,University of Calgary | Wenchen X.,Wuhan University | And 5 more authors.
Alcheringa | Year: 2010

Serrated gondolellid conodonts (Jinogondolella) are used to de.ne the Cisuralian-Guadalupian (C-G) or Kungurian-Roadian (K-R) boundary in the stratotype sections of West Texas and in some sections of South China, but in other sections Jinogondolella is absent. This absence has been interpreted to be the result of strong provincialism during this interval and geographic clines have been demonstrated between an Equatorial Warm Water Province (EWWP) and a North Cool Water Province (NCWP). Results from a succession of deep-water limestones in the Pingxiang section, southwestern Guangxi, China, suggest that the distribution of warm-water and cool-water lineages may not in all cases be separated over large geographic scales, but may be segregated in some areas by local changes of water-mass temperature or depth and, in some cases, fossil assemblages from these lineages may be mixed. Two contemporaneous gondolellid evolutionary lineages are represented within warm-water and cool-water conodont assemblages from limestones spanning the Cisuralian-Guadalupian (C-G) boundary in the Pingxiang section, southwestern Guangxi, China. The warm-water conodont lineage begins with the.rst occurrence (FO) of Mesogondolella saraciniensis, followed by Mesogondolella siciliensis, then M. idahoensis lamberti and.nally Mesogondolella pingxiangensis sp. nov. The latter new species lacks serration, but has a platform outline and lateral pro.le similar to J. nankingensis nankingensis found elsewhere in South China and they may be closely related. Although less common in the samples, a coeval cool-water lineage begins with M. idahoensis idahoensis and develops successively with the evolution of J. nankingensis gracilis; serration is also lacking in the latter species. The lack of serration on these forms is ascribed to some form of environmental control. The contemporaneous appearance of Mesogondolella pingxiangensis and Jinogondolella nankingensis gracilis is correlated with the C-G boundary. This correlation is supported by the co-occurrence of the zonal indices of the cool-water lineage with important zonal radiolarians in a C-G boundary section at Dachongling, southeastern Guangxi. Here the radiolarian assemblages are assigned to the Albaillella foremanae Zone, Pseudoalbaillella globosa Zone and P. fusiformis Zone in ascending order. The.rst appearance of J. nankingensis gracilis within this succession de.nes the base of the Guadalupian to be at the base of the P. globosa Zone. Conodont correlation between carbonate ramps of platform margins and radiolarian-bearing pelagic environments has determined that the.rst appearance of J. nankingensis gracilis precisely defines the base-Guadalupian boundary in the cool-water settings. © 2010 Association of Australasian Palaeontologists.

Liu G.,University of Science and Technology of China | Liu G.,Key Laboratory of Tectonics and Petroleum Resources | Liu K.,Shijiazhuang University of Economics | Wu C.,University of Science and Technology of China
Proceedings - 2010 6th International Conference on Natural Computation, ICNC 2010 | Year: 2010

Current environment of geo-visualization still has some disadvantages which mainly are: visualization entity model is not easy to be built; system software cannot support rapid modification and effectively reuse of former results; system platform cannot support consistency maintenance of visualization models. The theory and method of variant design, which has a public optimization feature, was proposed in this paper to get a better solution than parametric design method. The kernel concept of variant design and parametric design is "constraint solving" for constraint adding, deleting and maintenance. Based on the synthetic analysis and comparison of various constraint solving algorithms, the geometric constraint solving method based on Differential Evolution Algorithm (DEA) was introduced. The relative system function model and DEA procedure were put forward. Case studies of some typical graphics designs were discussed. The result indicates that variant design method can be effective in building the flexible generation environment for representation and visualization modeling of geo-spatial information. © 2010 IEEE.

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