General Institute of Chemical Geology Survey

Beijing, China

General Institute of Chemical Geology Survey

Beijing, China
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Liu J.,China University of Geosciences | Cao Y.,General Institute of Chemical Geology Survey | Carranza E.J.M.,James Cook University | Feng C.,Northwest University, China | And 3 more authors.
Resource Geology | Year: 2014

Secondary native Se minerals that are appreciably coarser grained and vary morphologically than primary native Se minerals were observed in the abandoned dumps of the No. 3 and No. 4 orebodies of the Yutangba Se deposit, western Hubei Province, China. The secondary native Se minerals exhibit three crystal forms, namely prismatic, tabular, and granular. Based on geochemical and mineralogical data, the secondary native Se minerals are interpreted to have resulted from natural oxidation of selenide minerals in the primary Se ores, or from vaporization of Se caused by burning of "stone coal" (a highly carbonaceous mudstone) during the production of lime. The occurrence of secondary native Se minerals in the deposit would be helpful not only to further study on mineralogy, ore geochemistry and environmental geochemistry of Se, but also to improve the technology of reclaiming Se from the black rock series. © 2014 The Society of Resource Geology.

Liu Y.-C.,China University of Geosciences | Bai Z.-D.,China University of Geosciences | Song K.-D.,China University of Geosciences | Liu L.,General Institute of Chemical Geology Survey
Dizhen Dizhi | Year: 2016

Wulanhada volcano cluster is located at the intersection area between the Inner Mongolia Axis and its bordering accretion zone in the northern borderland of North China massif. The Late Quaternary includes the Late Pleistocene Epoch and the Holocene Epoch. The volcanic products are mainly basalt, together with basaltic welded pyroclastic rocks and loose cinders. With alkaline contents (Na2O+K2O) of the basalts ranging from 5.94% to 8.34%(7.55% in average), and K2O/Na2O from 0.48 to 0.59 (lower than 1), it falls into the category of sodium-alkaline series. Chemical and geochemical characteristics indicate that the basaltic magma, to a certain degree of magmatic differentiation and crustal contamination, is of weak evolution, although it is generated from enriched mantle. The Late Pleistocene is mainly of alkaline-olivine basalts while the Holocene is of tephrite. With a continental intraplate origin, Wulanhada basalts were formed in an intraplate setting at the early stage of continental rifting. © 2016, Editorial Office of Seismology and Geology. All right reserved.

Cao Y.,China University of Geosciences | Cao Y.,General Institute of Chemical Geology Survey | Li S.,China University of Geosciences | Xiong X.,General Institute of Chemical Geology Survey | And 4 more authors.
Acta Geologica Sinica | Year: 2012

The Shihu gold deposit, situated in the Taihang Mesozoic orogen of the North China Craton (NCC), is hosted by ductile-brittle faults within Archean metamorphic core complex. The deposit is characterized by gold-bearing quartz-polymetallic sulfides veins. The Mapeng granitoids stock and intermediate-basic dikes intruded the metamorphic basement rocks, and are spatially related to gold mineralization. Detailed laser ablation inductively coupled plasma mass spectrometry (LA ICP-MS) U-Pb zircon ages of the granitic rocks, dykes and mineralized quartz veins in the studied area reveal its magmatic and mineralized history. The mineralized quartz veins contain inherited zircons with ages of about 2.55 Ga and 1.84 Ga, probably coming from the basement. These two Precambrian events are coeval with those in other parts of the NCC. The Mapeng granitoid stock, the largest intrusion in the area, was emplaced at ca. 130 Ma, and is coeval with magmatic zircon populations from diorites and quartz diorite pophyrites in the same region. The ca. 130 Ma magmatism and gold mineralization were most likely related to an underplating event that took place in the Taihang orogen at Late Mesozoic. The timing of gold mineralization with respect to felsic magmatism in the area is similar to those observed in other major gold-producing provinces in the NCC. This episode is simultaneous with those in the eastern margin of NCC, indicative of a widespread late Yanshanian metallogenic event that was a response to the Early Cretaceous lithosphere in the eastern NCC, in which the mesothermal gold deposits were formed from similar tectono-magmatic environments. © 2012 Geological Society of China.

Chen X.,Chinese Academy of Geological Sciences | Pang S.,General Institute of Chemical Geology Survey | Liu Q.,Chinese Academy of Geological Sciences
Electronic Journal of Geotechnical Engineering | Year: 2015

Since the difficulty of obtaining the blasting wave signals, there were few studies on the process of the combined effect of the blasting shock wave, the stress wave and the gas-expanding in the adjacent area at the instant of blasting. In this paper, based on the generalizing of the previous test experience, the transient blasting wave strain signals in the concrete model are tested by resistance strain gauges with high dynamic strain testing system and technique. The paper quantitatively researched on the blasting wave and the essential characteristics of the separated blasting shock wave. The results show that, the blasting shock wave is a short-time and high-strength non-periodic pressure pulse. And its waveform is similar to a periodic tensile- compressive stress curve. The stress wave caught by the action of gas-expanding lasts the longest time. The result of the peak pressure of shock wave and the action time agrees well with the result in other's literatures, which validated the result in this paper. © 2015 ejge.

Cao Y.,General Institute of Chemical Geology Survey | Xiong X.-X.,General Institute of Chemical Geology Survey | Li X.,Geological Institute | Tang Y.,General Institute of Chemical Geology Survey | Wang Y.,General Institute of Chemical Geology Survey
Xiandai Huagong/Modern Chemical Industry | Year: 2013

The sulfur deposit is one of the important chemical mineral resources, which plays a significant role in maintaining the sustainable development of fertilizer industry and agriculture production. The sulfur deposit can be divided into two types, natural sulfur and pyrite deposit. The genetic type of the pyrite deposit can be additionally classified into seven sub-types, which are sedimentary metamorphic type, marine volcanic type, continental volcanic type, sedimentary (transformation) type, magmatic hydrothermal type and sedimentary pyrite in coal. The native sulfur deposit is mainly sedimentary type. This paper summarizes the basic characteristics of each type of the sulfur deposits, and evaluates the geological features of the important prospecting area. The three types, which are sedimentary (transformation) type, sedimentary metamorphic type sedimentary pyrite in coal, still have great prospecting potentials. It is an effective approach to exploit the associated and symbiotic sulfur resource by re-evaluating the sulfur potential of magmatic hydrothermal type and marine volcanic type polymetallic deposit.

Wang S.,Chinese Academy of Geological Sciences | Wang S.,General Institute of Chemical Geology Survey | Zheng M.,Chinese Academy of Geological Sciences | Zhang Z.,Chinese Academy of Geological Sciences | Su K.,Chinese Academy of Geological Sciences
Earth Science Frontiers | Year: 2016

The Cambrian evaporite basin developed in Sichuan Basin covers an area of ~200000 km2; the salt-bearing areas are mainly distributed in the central part of the evaporite basin, e.g. southeastern Sichuan, northwestern Guizhou, northeastern Chongqing, and northwestern Hubei (Jiannan). The main salt-bearing strata in this area are the Lower Cambrian and Middle Cambrian (second and third series), which are different in various areas. According to the characteristics of salt-bearing strata and its spatial distribution, the evaporite basin is broadly divided into two gypsum-halite accumulation areas (subbasins): the southeastern Sichuan subbasin and northeastern Chongqing subbasin. The main salt-bearing horizon in southeastern Sichuan is mainly the Lower Cambrian Qingxudong Formation (mid-upper part of the fourth stage of the Cambrian); the salt-bearing horizon in northeastern Chongqing is mainly the Middle Cambrian Qinjiamiao Formation (third series). Previously, many studies on lithofacies paleogeography and potash finding hydrochemistry had been done, but lack of the study on carbon and oxygen isotope analyzes for drilling samples of Cambrian carbonate in studying the evolution of salt basin. The present study chooses Cambrian carbonate samples from the three representative drillings (Dingshan No1 well, Lin No7 well and Jianshen No1 well) to analyze the carbon and oxygen isotope composition. We hold the opinion that the δ13C negative drift is related with marine regression and biological extinction events and δ13C positive drift is mainly effected by marine transgressive events. The frequently alternation of transgression and regression in Cambrian is good for the formation of source-reservoir-caprock system in Sichuan Basin, and the formation of ancient reservoirs. Southeastern Sichuan subbasin is a closed and strongly evaporation environment in Longwanniao formation(the middle and upper part of the fourth stage), forming the depocentres of gypsum-halite accumulation areas in Jiangjin-Luzhou area. The δ13C value and salinity of Jianshen 1 well is higher than that of Lin 7 well. Combing with Sichuan Basin lithofacies paleogeography research, we consider that from early to mid-Cambrian the seawater was more and more highly concentrated from southeastern Sichuan subbasin to northeastern Chongqing subbasin, which is significant for potash finding and the study on hydrocarbon forming conditions in Sichuan Basin. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.

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