Gold Geological Institute of Chinese Army Police Force

Langfang, China

Gold Geological Institute of Chinese Army Police Force

Langfang, China
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Hao B.-W.,Gold Geological Institute of Chinese Army Police Force | Hao B.-W.,China University of Geosciences | Zhang W.-Z.,Gold Geological Institute of Chinese Army Police Force | Ge L.-S.,Gold Geological Institute of Chinese Army Police Force | And 6 more authors.
Kuangwu Yanshi/ Journal of Mineralogy and Petrology | Year: 2014

The Gaoshongshan epithermal gold deposit occurred in Lesser Xingan Range epithermal gold belts of western Jiamusi platform. EPMA and microscope analysis reveal that the major goldcarrying minerals include quartz,pyrites,chalcopyrites. The gold in quartz is companied by a large number of silvers and some bismuth, and it mainly occurs in state of nature gold among subgrown quartz grains. Pyrites mainly appeared in andesitic wall rocks, with more forming phases and period,characteristic of early state of natural gold and late state ionic gold. Boiling and sulfidation reaction of country rocks are the primary precipitation mechanism of gold,and the two mechanisms occurred under reductive conditions and the eduction of gold resulted from lower concentrations of sulfureted hydrogen. The appearance of eyeable gold developing among subgrown quartz grains and pyrites (hematite) indicated another stage of enrichment of ore-forming fluid. The phenomena of late formed pyrites and chalcopyrites with poor gold mineralization-suggest that the Gaosongshan epithermal gold deposit developed in multiple-periods.


Hao B.,Gold Geological Institute of Chinese Army Police Force | Hao B.,China University of Geosciences | Hao B.,Chinese Academy of Geological Sciences | Hou Z.,Chinese Academy of Geological Sciences
Acta Geologica Sinica | Year: 2012

Early Paleozoic granodiorite has been identified on the northern margin of the North China craton in the east section of the central-Asian orogenic belt, which was previously known as early Indosinian in age. By using the LA-ICP-MS method, the obtained zircon U-Pb age is 445.6±2.7 Ma, which represents the crystallization age of the granodiorite. The granodiorite near the east of the large-sized Bilihe gold deposit is of the tholeiite series with low potassium. It is quasi-aluminous I-type granite, enriched in sodium (Na 2O/K 2O=7.29-9.77) and magnesium (Mg #=0.51-0.67) . The σREE value is relatively low, obvious differentiation is shown between LREE and HREE and within LREE, and the Eu anomaly is low and negative (δEu=0.74-0.91). In the primitive-mantle normalized spider diagrams of trace elements, the granodiorite is relatively rich in LREE and LILE (Ba, Sr, Th), and strongly depleted in HFSE (Nb, Ta, Ti and P), which shows features of subduction zone components (SZC). In the discrimination diagrams of tectonic settings of granite for Rb vs. (Nb+Y), Rb vs. (Ya+Ta), La/Nb vs. Ba/Nb and Th/Nb vs. Ba/Nb, the granodiorite exhibits typical features of island arc granite. The normalized values of K and Rb are extremely low, while the values of Sr and Eu are very high, which are similar to those of island arc magma that has undergone metasomatism of fluid from the oceanic crust. The granodiorite is relatively depleted in ε Hf(t) (5.1-7.1) and low in ε Hf(t) model ages (1089-921 Ma). In the ε Hf(t) vs. age (T) diagram, the distribution area of the granodiorite is accordant with the field of the Xing'anling-Mongolia orogenic belt, which indicates that the magmatic sources are mainly the mixture of partial melting of wedged mantle subjected to metasomatism of fluid from the oceanic crust and young substance from the crust The granodiorite is similar to the felsic arc magma in the Damao Banner, Bate Obon, Boin Sum and Ordor Sum regions, and they altogether constitute an early Paleozoic accretionary island arc magmatic belt on the northern margin of the North China craton. A number of early Paleozoic zircons trapped in late Paleozoic intrusions in the Hadamiao and Bilihe regions and the discovery of the early Paleozoic island arc magmatic belt near the east of the Bilihe gold deposit suggest that the late Paleozoic volcanic-intrusive rocks have a basement of early Paleozoic arc accretionary complexes. This is just the evident of the multiphase subduction and accretion model of the Paleo-Asian Ocean (PAO). Paleozoic structures and magmas on the northern margin of the North China craton are shown from south to north as the late Paleozoic Andes-type arc magmatic belt in the Inner Mongolia plateau, the Chifeng-Bayan Obo fault and the late and early Paleozoic arc magmatic belt, which shows that after the early Paleozoic arc-continent collisional orogeny and at the stage of the late Paleozoic accretionary orogeny, the PAO plate was likely to continuously pulsate and underthrust beneath the early Paleozoic island arc accretionary complex belt and its front, i.e. the North China craton. During the early Paleozoic collisional orogeny, the PAO plate might not experience large-scale breakup or delamination. The characteristics of the early Paleozoic island arc accretionary complex basement have a significant control on late Paleozoic diagenesis and metallization in the Hadamiao and Bilihe gold concentrated areas. © 2012 Geological Society of China.


Hao B.-W.,Gold Geological Institute of Chinese Army Police Force | Hao B.-W.,China University of Geosciences | Hao B.-W.,Chinese Academy of Geological Sciences
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2012

The marolitic K feldspar granite occurring in Southern Xianghuangqi is located in the east fragments of the Central Asia orogenic belts (CAOB) and north of the North China platform. By LA-ICP-MS zircon U-Pb dating, the mean age of zircons, (262.7±2.0) Ma, can represents the crystallization ages of the feldspar-granites. Geochemical characteristics of the rock indicate the complexes belong to norm aluminum, weakly excessive aluminum to excessive aluminum, I-types and A-types granite. Geochemical feartures of different type granite change in regularity, namely. From quartz-monzogranite to K feldspar granite-porphyry and marolitic K feldspar granite, the content of SiO2, total alkaline and negative abnormal values of δEu increased, and basic compositions gradually decreased. In the Harker figures, the contents of Al2O3, TFeO, TiO2, CaO, P2O5, and Na2O increased respectively, and the contents of K2O decreased gradually, which all shows linear. Integrating the distribution of model diagrams of the normalized trace elements and REE indicate the marolitic K feldspar granite in Southern Xianghuangqi had the same origin and formed in various phases. According to the lower values of Mg# (0.03 to 0.37), ratios of Rb/Sr (0.58 to 5.73, 0.23 to 0.48, and 0.20 to 0.27), the values of isotopes (εHf(t)=-2.65 to 2.38), and the model ages of the εHf(t)(1 220.80 to 957.97 Ma), the marolitic K feldspar granite occurring in Southern Xianghuangqi is located in the transitional ranges from the CAOB to the North China craton (NCC), and its sources is melting of the new accreted juvenile crust materials of the arc accretion complexes basements. The marolitic K feldspar granite characterized by features of subduction zone contents (SZC) was controlled by the basements with property of arc-magmas. One A-type granite zone consisting of feldspargranites in southern Xianghuangqi in north of the North China craton, and Wuliangyasitai A-type granites in the west fragments of the North China craton, may imply the Paleo-Asia Ocean's suture. The west of the A-type granite zone is older than the east.

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