Gold Geological Institute of CAPF

Langfang, China

Gold Geological Institute of CAPF

Langfang, China
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Liu P.,China University of Geosciences | Liu P.,Gold Geological Institute of CAPF | Mao J.,China University of Geosciences | Mao J.,Chinese Academy of Geological Sciences | And 4 more authors.
Lithos | Year: 2017

The Zijinshan intrusion is located to the south of the Tongling ore cluster of the Middle-Lower Yangtze River Valley metallogenic belt (YRB) and even south to the Yangxing–Changzhou Fault (YCF), which separates the YRB and the Jiangnan Massif. It is an I-type high-K calc-alkaline granodiorite with abundant MMEs. Zircon LA-MC-ICP-MS U–Pb ages of 144.0 ± 1.0 Ma and 142.5 ± 1.0 Ma for the host granodiorite and MMEs indicate coeval formation. Biotites from the host granodiorites and MMEs have similar composition, with low FeOt/(FeOt + MgO) values of 0.60–0.65 and 0.60–0.65, and high MgO contents of 10.51–11.70 wt.% and 10.89–12.37 wt.%, respectively. All the biotite samples are between the NNO and the MH buffers. The host granodiorites are metaluminous (A/CNK = 0.94–0.95), enriched in Cs, Rb, U and Pb, depleted in Ba, Sr, Nb, Zr, P, and Ti, with moderate negative Eu anomalies of 0.80–0.87, (87Sr/86Sr)i of 0.70874 to 0.70887, εNd(t) of − 5.63 to − 5.36 and εHf(t) of − 8.68 to − 2.76. The MMEs have lower SiO2 and higher K2O, and they are also enriched in Cs, Rb, U, Ta and Pb, and depleted in Ba, Sr, Nb, Zr, P and Ti, with (87Sr/86Sr)i of 0.70889 to 0.70927, εNd(t) of − 5.52 to − 5.20 and εHf(t) of − 6.46 to − 3.59. All these characteristics demonstrate that partial melting of both the lower crust and an enriched lithospheric mantle metasomatized by subducted slab fluid and their subsequent mixing led to the origin of the I-type granodiorite magmas of the Zijinshan intrusion, which took place in the geodynamic context of the subduction of the Izanagi plate. Combined with the field investigations, we suggest that the Zijinshan intrusion has potential for porphyry Cu–Au mineralization and the Cu–Au metallogenic belt of the YRB may have extended to the south of the YCF. © 2017 Elsevier B.V.

Liu P.,China University of Geosciences | Liu P.,Gold Geological Institute of CAPF | Mao J.,Chinese Academy of Geological Sciences | Cheng Y.,Chinese Academy of Geological Sciences | And 4 more authors.
Ore Geology Reviews | Year: 2016

The Feie'shan W-Sn deposit is in eastern Guangdong Province, which is a newly explored deposit in the southeastern coastal metallogenic belt. In order to constrain the age of mineralization in the Feie'shan W-Sn deposit, we collected molybdenites and hydrothermal biotite of the Feie'shan W-Sn deposit for dating. The tungsten mineralization is spatially associated with the biotite monzonitic granite porphyry. LA-MC-ICP-MS zircon U-Pb dating of the biotite monzonitic granite porphyry yielded a weighted mean 206Pb/238U age of 139.2±1.7Ma, which was interpreted as the emplacement age of the biotite monzonitic granite porphyry. The Re-Os model ages ranged from 137.3±2.0Ma to 146.1±2.1Ma, with a weighted mean age of 140.6±1.9Ma, and Ar-Ar isotopic analyses of hydrothermal biotite yield a plateau 40Ar/39Ar age of 135.1±0.8Ma. These dates, obtained via three independent geochronological techniques, constrained the ore-forming age of the Feie'shan deposit and linked the genesis of the ore to the underlying biotite monzonitic granite porphyry. Combined with previous studies, it is suggested that there is a period at 144-132Ma for W-Sn mineralization in the Southeastern Coastal Metallogenic Belt. The Feie'shan W-Sn deposit belongs to the 144-132Ma metallogenic events in the SCMB, in a geodynamic setting of lithospheric extension. © 2016 Elsevier B.V.

Chao Y.,China University of Geosciences | Li Y.,Beijing Institute of Geological Engineering | Qing M.,Gold Geological Institute of CAPF
2011 International Conference on Multimedia Technology, ICMT 2011 | Year: 2011

The key point of early warning and prevention of geological disasters focuses on the regional geological disasters in long-term real-time monitoring. For the always happened, most damaging geological disaster-landslides, unattended monitoring stations with embedded, wireless sensor networks were designed to real-time acquire regional geological environment data related to landslide in monitoring area, then stored the data in the data warehouse that based on temporal GIS technology. On the system platform designed by ArcGIS Server, using geological disaster warning model systems that built on space analysis technology to process and analyses the GIS data that contained the time properties comprehensively, to predict the probability of landslide occurrence in the future point, and use WebGIS to publish, form a complete warning system platform. © 2011 IEEE.

Ge L.,Gold Geological Institute of CAPF | Deng J.,China University of Geosciences | Yang L.,China University of Geosciences | Wang Z.,Gold Geological Institute of CAPF | And 2 more authors.
Acta Petrologica Sinica | Year: 2012

The western Yunnan area, an important part of the Sanjiang composite orogenic belt in the southwestern part of China, is located in the special position between the Yangtze plate and the India plate. Geological data revealed a complex structure in this area. The crust could be divided into three layers bearing irregular lens showing low velocity. The Moho interface shows upstairs from north to south and alternated between hunch and hollow. The transition belt occurred between the crust and the mantle. The lithosphère mantle shows multilevel hunches. The lower structure and the upper structure compose multilevel flyover-like structure. The magmatism and mineralization events are supposed to be closely related to the deep structures. Spatially, the areas hosting magmatic rocks and deposits are controlled by the deep faults indicated by the mantle slope, and corresponded to the inner crust low velocity bodies and crust-mantle transition belt. The magmatic rock diversities, petrology and geochemical data show that the magma responsible for these rocks would be originated from the transition belt between the crust and mantle by partial melting for which the upwelling of mantle fluid should be one of the important inducements. Composite analysis indicated that the special structural position and the regional evolution history of dynamic transition of the western Yunnan area in Late Yanshanian to Himalayan epochs should be responsible for the formation of the structures in the crust and mantle. They were also should be a triggering to the extensive crust-mantle interaction. In such a process, huge amount of metallic element be transported to the transition belt along the important faults by the mantle fluid which triggered the partial melting to form original magma. With the evolution and separation of magma, the magmatic rocks and mineral deposits formed in suitable structural locations to constitute the characteristic uniform of regional magmatism and mineralization. The upwelling pulses of lithosphere mantle would be the fundamental control to the multi-stage mineralization events.

Wang Z.,Gold Geological Institute of CAPF | Ge L.,Gold Geological Institute of CAPF | Guo X.,Gold Geological Institute of CAPF | Wang L.,Gold Geological Institute of CAPF | And 2 more authors.
Acta Petrologica Sinica | Year: 2012

Three types of deposit found in Machangqing ore field: porphyry-type copper-molybdenum deposit is in the Machangqing complex intrusion, contact-metasomatic-type copper-molybdenum (iron) deposit in inner and outside the contact between strata and the intrusion and epithermal gold-lead-zinc deposit in outside strata. Wallrock alteration zonation is clear, from the center of intrusion to outside, showing strong silicification → quartz, K-feldspar → quartz, K-feldspar, sericitization → skarn → low-middle-temperature hydrothermal alteration. Isotope-dating shows the metallogenesis age of three types of deposit is 33.7 ∼ 35. 8 Ma, and gold deposit is slightly later the copper-molybdenum deposit, according with the intrusion age (33 ∼ 37 Ma). H, O, Pb, S isotopes and fluid inclusions suggest that from porphyry copper-molybdenum deposit → contact-metasomatic copper-molybdenum (iron) deposit → epithermal gold-lead-zinc deposit, homogeneous temperatures, salinities of fluid inclusion and homogeneous pressures are decreasing trendingly. The metals and fluid for ore-forming are mainly from the magma system in the early in porphyry-type copper-molybdenum deposit, and change into wallrock and precipitate water in later in epithermal gold-lead-zinc deposit. The relationships of time, space and material of different types of deposit insinuate they are products of different envolution stages of same source magma. Physics and chemical characteristics and migration conditions of hydrothermal determine different deposit types occurring different positions. A metallogenic system consist of porphyry-type and epithermal copper-molybdenum-gold ploymetal related to alkalic-rich porphyry is built up in this paper.

Bao C.,China University of Geosciences | Chen Y.-L.,China University of Geosciences | Li D.-P.,China University of Geosciences | Chen X.,China University of Geosciences | Chen X.,Gold Geological Institute of CAPF
Geochemical Journal | Year: 2015

In this study, we performed U-Pb dating on 1295 zircon grains from 24 samples originating from the North China Craton (NCC); an additional 440 Lu-Hf isotopic analyses were conducted on select zircon grains. The U-Pb ages revealed that the strongest magmatic event in the NCC occurred ca. 2.5 Ga, and a subordinate magmatic event occurred ca. 1.8 Ga. The crustal model ages from Hf isotopic analyses showed that the best estimate for the age of the NCC mantle extraction is ca. 2.8-2.7 Ga, which is consistent with the age of global continental crusts. In recent years, numerous 2.7 Ga rocks have been identified within the NCC. A strong and widespread superimposed tectono-thermal event at ca. 2.5 Ga differentiates the NCC from many other worldwide cratons. However, the timing of the majority of NCC continental crust growth remains highly controversial. In this paper, a quantitative method was used to calculate a continental crust reworking rate. The results revealed that the lowest reworking rate in the NCC occurred at ca. 2.7 Ga and was below 13%. At 2.9 Ga, the reworking rate was 73%, suggesting that a strong intra-crustal magmatic event took place at that time. Combining the reworking rates and Hf isotopic model ages for each period, we concluded that approximately 25% and 23% of the continental crust volume in the NCC was formed at ca. 2.8 Ga and 2.7 Ga, respectively. Approximately 12% of the continental crust volume formed at 2.6 Ga, and only 6% of the continental crust formed at ca. 2.5 Ga. Even with a high reworking rate, 6% of the continental crust formed at 2.9 Ga. Therefore, the main continental crustal growth in the North China Craton occurred at ca. 2.8-2.7 Ga (48% continental crust). Copyright © 2015 by The Geochemical Society of Japan.

Yang L.Q.,China University of Geosciences | Deng J.,China University of Geosciences | Zhao K.,China University of Geosciences | Liu J.T.,China University of Geosciences | And 4 more authors.
Acta Petrologica Sinica | Year: 2011

Daping gold deposit, situated in the south section of the Ailaoshan orogenic belt, once considered to be an orogenic gold deposit, displays many distinct geological characteristics which are inconsistent with the classical orogenic gold deposits around the world, but accord with the epithermal gold deposits. The vein type gold, copper, lead, silver deposits commonly develop in close association with intermediate-acidic intrusive and intermediate-basic volcanic rocks regionally. Daping gold deposit was formed in the Neozoic tectonic-magmatic activity, which is 800Ma later than the emplacement of Taojiazhai diorite which is the main host rocks, besides the gold metallogenesis is closely related to the regional structural framework and the transition of tectonic regime. The host faults of main ore-forming period are generally believed as a transtensional normal faults, and ore veins within are abundant (55) , thin (0. 2 ∼0. 8m) , long (200 ∼ 1500 m) , steep (56° ∼85°) , deeply extensive (700m) and developed in parallel, besides ore bodies in association with Pb, Cu and Ag display high-grade Au (above 10 × 10-6 ) , low Au/Ag ratio (0. 1 ∼0. 5). Textures and structures of filling type as well as mineral assemblages indicate that ore veins formed at a low-temperature and shallow-depth environment, what' more, mineralization-alteration types and the growth of opal and oxidized ores restrict an open and oxidizing environment. The distinguished geological characteristics of Daping gold deposit may be closely related to the complicated tectonic regime and metallogenic evolution, though the deposit is distinguished by its feature of orogenic gold deposits, epithermal gold, copper, lead, silver mineralization is overlapped in the shallow during the late stage of mineralization. The metallogenic characteristics, combined with documented geological information, indicate Daping gold deposit is distinguished by its orogenic in the deep and epithermal in the shallow, besides the metallogenic system is well preserved. Considering all the ores proven now are in the shallow, Daping gold deposit is of great prospecting potentiality in the deep.

Xie Z.,Anhui University of Science and Technology | Wang B.,Anhui University of Science and Technology | Wang B.,Gold Geological Institute of CAPF | Chen J.,Anhui University of Science and Technology | Qian H.,Anhui University of Science and Technology
Journal of Asian Earth Sciences | Year: 2013

Several metabasite lenses in Ganghe, Central Dabie, that were previously described as pillow lavas are studied by elemental, Sr-Nd-Pb isotopic, and mineral oxygen isotopic analysis as well as zircon SHRIMP U-Pb dating. Zircon U-Pb geochronology results indicate that the protolith emplacement age of these metabasites is approximately 717±38Ma, consistent with the age of the volcanoclastic rocks in the same unit, and that they experienced the Triassic HP eclogite-facies retrograde metamorphism at 221±2Ma during exhumation after subduction to mantle depth and peak ultra-high pressure metamorphism. The low δ18O values of -5.5‰ to -2.0‰ indicate that the protoliths underwent high temperature meteoric-hydrothermal alteration before subduction but had no seawater interaction. These metabasites had similar formation processes, water-rock interactions and metamorphisms as other eclogite-facies rocks cropped out in the Central Dabie terrain. They showed negative abnormalities in Nb, Sr, and Ti content and positive abnormalities in Ba, Th, and Pb content; they also showed LREE enrichment. The insusceptible Sm-Nd isotopes during metamorphism yielded εNd (t)=-12 to -10 and TDM=2.2-2.8Ga for samples from lenses #1 to #3 and -7 to -6 and 2.1-2.2Ga for lens #4; the samples also showed low radiogenic Pb isotope compositions of (206Pb/204Pb)i=15.34-16.50, (207Pb/204Pb)i=15.23-15.32, and (208Pb/204Pb)i=35.93-37.04. The data suggest that the protolith sources of the metabasites were contaminated to variable degrees by old crustal materials during formation. Unlike the Maowu layered intrusions, which were contaminated by upper crust, the magmas of the metabasites were contaminated by lower crust in the magma chamber and during eruption. It can be concluded that the protoliths of these metabasites were derived from old crustal-contaminated mantle sources and initially emplaced in the crust at the Neoproterozoic and that they were altered by meteoric water at high temperatures. In this respect, they might be similar to the Neoproterozoic mafic intrusions in the North Huaiyang terrain. However, the studied metabasites experienced the Permo-Triassic subduction and metamorphism, whereas the North Huaiyang Neoproterozoic mafic intrusions did not. © 2012 Elsevier Ltd.

Liao G.-X.,Chinese Academy of Geological Sciences | Li Z.-H.,Gold Geological Institute of CAPF
Wutan Huatan Jisuan Jishu | Year: 2010

The paper introduces the general principle of GRD gridding method in drawing profiles map by graded color filling. Its' programming process is utilizing SaveDemToSurfGrd( ) function supplied by MAPGIS on secondary development platform based on Visual Basic to realize the converting survey data to normal GRD grid data, and converting GRD grid data to MSI image file in image processing module of MAPGIS. The advantage and limitation of the method is also discussed in this paper.

Xia R.,China University of Geosciences | Xia R.,Gold Geological Institute of CAPF | Wang C.,China University of Geosciences | Deng J.,China University of Geosciences | And 4 more authors.
Journal of Asian Earth Sciences | Year: 2014

Late Triassic granodiorites and their mafic micro-granular enclaves (MMEs) from Xiao-Nuomuhong in the EKOB were studied for geochemistry and geochronology to constrain their petrogenesis. Zircon LA-ICP-MS dating indicates that the Xiao-Nuomuhong granodiorites are coeval with their MMEs (~222Ma). The granodiorites are high-K calc-alkaline rocks that are enriched in Rb, Th, U and LREE, and depleted in Cr, Ni and HFSE, with high Sr/Y ratios (82.2-85.3) and geochemically resemble the lower crust-derived adakites. The MMEs are also high-K calc-alkaline rocks, with high Al2O3 (16.8-18.8wt.%), low Mg# (30-40), Nb, Zr and Hf, with weak negative Eu anomalies (Eu/Eu#=0.8-0.9). We suggest the MMEs are mafic magmatic globules that were injected into the felsic host magma. The adakitic rocks from the Xiao-Nuomuhong pluton were generated by partial melting of thickened crust, while the primitive compositions of the MMEs were most likely from the lithospheric mantle beneath the EKOB. The Late Triassic Xiao-Nuomuhong pluton is important evidence that crustal thickening in the EKOB occurred prior to 220Ma. The pluton is interpreted as the result of mixing between thickened lower crust-derived melts and lithospheric mantle-derived mafic melts and the protracted magmatic response to the break-off of the Paleo-Tethys oceanic slab at ~232Ma. © 2014 Elsevier Ltd.

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