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Li Q.-Y.,Chengdu University of Technology | Cai H.-R.,Sichuan Nuclear Geology Institute
Journal of Chengdu University of Technology (Science and Technology Edition)

This paper discusses the relationship between radon and its tracing distance based on the deep-penetration, and then renews the theory that the anomaly is related to deep uranium deposits in the ground. The geogas coming from the mantle goes through the uranium ore and takes along its 238 U or 226 Ra elements which can be deposited in some geochemical bars and form the anomaly of 238 U and 226Ra that is related to the deep uranium ore. This paper points out that the result of radon survey on the surface is not only related to 222 Rn in the soil, but also to 226 Ra or 238 U that comes from the deep crust. This may be regarded as the key reason of radon anomalies caused by the deep uranium ore. As a result, the paper offers a new view to the relationship between the results of radon prospecting and uranium ore. Source

Zheng R.-C.,Chengdu University of Technology | Zhang T.-L.,Chengdu University of Technology | Pan Y.-H.,Chengdu University of Technology | Pan Y.-H.,Sichuan Nuclear Geology Institute | And 2 more authors.
Journal of Chengdu University of Technology (Science and Technology Edition)

By using drilling cores, logging data and sequence-lithofacies palaeogeography mapping techniques, the authors make a detailed study on the characteristics of Lower Devonian reservoir sedimentology in Block 438B, Oued Mya Basin, Algerian in this paper. Block 438B is located in northcentral Oued Mya Basin. It is a Paleozoic-Mesozoic superimposed basin rich in oil and gas. In Block 438B, There develop two types of depositional systems of continental shelf and barrier island-shore in the Lower Devonian. They have a good hydrocarbon source-reservoir-cap assemblage and exploration potential. The barrier island-shore system is composed of barrier sand dams, tidal channels, washover fans, lagoons and tidal flats. The results of reservoir prediction and evaluation based on the reservoir sedimentology indicate that the reservoir is mainly controlled by barrier sand dam and washover fan microfacies during HST. The two sedimentary microfacies are the major exploration targets. Source

Zheng R.,Chengdu University of Technology | Pan Y.,Chengdu University of Technology | Pan Y.,Sichuan Nuclear Geology Institute | Zhao C.,Chengdu University of Technology | And 3 more authors.
Journal of Earth Science

Based on the detailed research on petrologic and geochemical characteristics of deposition and diagenesis of Oxfordian carbonate rocks in Amu Darya Basin, Turkmenistan, carbon and oxygen isotopes were analyzed. The results show that the paleoenvironmental evolution reflected by the samples with well-preserved original carbon isotopes coincides with the carbon-isotope stratigraphic curve and is almost consistent with the global sea-level curve, the Mid-Oxfordian wide transgression, and the positive carbon-isotope excursion event. The Mid-Oxfordian continuing transgression not only laid the foundation for the development of the Oxfordian reef and shoal reservoirs in Amu Darya Basin but also provided an example for the Oxfordian global transgression and the resulting development of reefs and banks and high-speed organic carbon burial events. The response of oxygen isotopes in diagenetic environment showed that micrite limestones and granular limestones underwent weak diagenetic alteration, and the samples largely retained the original seawater features. Dolomitization and the precipitation of hydrothermal calcites filling solution vugs and fractures before hydrocarbon accumulation occurred in a closed diagenetic environment where the main controlling factor is the temperature, and the diagenetic fluids were from the deep hot brine. The chalkification of the limestones after hydrocarbon accumulation occurred in the oilfield water systems. © 2013 China University of Geosciences and Springer-Verlag Berlin Heidelberg. Source

Huang C.-H.,Chengdu University of Technology | Huang C.-H.,Sichuan Nuclear Geology Institute | Zhang C.-J.,Chengdu University of Technology
Journal of Chengdu University of Technology (Science and Technology Edition)

The paper studies the uranium mineralization geological conditions of the Ruoergai uranium field in Sichuan of China to provide the basis for the metallogenic prediction and selecting the prospecting target areas. Through the field geological survey of the main uranium ore deposits of Ruoergai and the integrative data analysis, the results show that the formation of uranium ore deposits in this area is closely related with the very favourable geological settings and conditions. These include the uranium-rich old landmass, the uranium-rich sedimentary and rock masses, the magmatic activities, the intermediate-acid intrusive rocks containing uranium, the great deep fault belt, the continental red sandy conglomerate basin of Mesozoic-Cainozoic era, the favorable rock associations and their physcomechanical properties etc. The relatively clustered distribution of the uranium deposits in the west ore belt of the Ruoergai uranium ore field and the very favorable geological settings and conditions for uranium mineralizations suggest that the Ruoergai area is the target area for searching the rich and giant blind ore deposits. Source

Song H.,Chengdu University of Technology | Song H.,Key Laboratory of Nuclear Techniques in Geosciences of Sichuan Province | Zhang C.,Chengdu University of Technology | Zhang C.,Key Laboratory of Nuclear Techniques in Geosciences of Sichuan Province | And 5 more authors.
Acta Geologica Sinica

The carbonaceous-siliceous-argillitic rock type uranium deposit in the Zoige area is located in the northeastern margin of the Tibetan Plateau, and has gained much attention of many geologists and ore deposit experts due to its scale, high grade and abundant associated ores. Because of the insufficient reliable dating of intrusive rocks, the relationship between mineralization and the magmatic activities is still unknown. In order to study this key scientific issue and the ore-forming processes of the Zoige uranium ore field, the LA-ICP-MS zircon U-Pb dating of magmatic rocks was obtained: 64.08±0.59 Ma for the granite-prophyry and ∼200 Ma for the dolerite. U-Pb dating results of uraninite from the Zoige uranium ore field are mainly concentrated on ∼90 Ma and ∼60 Ma. According to LA-ICP-MS U-Pb zircon dating, the ages for the dolerite, porphyry granite and granodiorite are 200 Ma, 64.08 Ma approximately and 226.5-200.88 Ma, respectively. This indicates that the mineralization has close relationship with activities of the intermediate-acidic magma. The ages of the granite porphyry are consistent with those uraninite U-Pb dating results achieved by previous studies, which reflects the magmatic and ore-forming event during the later Yanshanian. Based on the data from previous researches, the ore bodies in the Zoige uranium ore field can be divided into two categories: the single uranium type and the uranium with polymetal mineralization type. The former formed at late Cretaceous (about 90 Ma), while the latter, closely related to the granite porphyry, formed at early Paleogene (about 60 Ma). And apart from ore forming elemental uranium, the latter is often associated with polymetallic elements, such as molybdenum, nickel, zinc, etc. © 2014 Geological Society of China. Source

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