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Li H.-P.,Chinese Academy of Geological Sciences | Li H.-P.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | Cheng X.-M.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | Zuo Z.-Y.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | Dou Q.-C.,Qaidam Integrated Geological Exploration Institute of Qinghai Province
Northwestern Geology | Year: 2012

Based on field geological observation and indoor analysis, we have reclassified the stratum in Kaxinling polymetallic mining deposit, and discussed the metallogenic geological features mineralization mechanism of the deposit. There are 4 sections of ore that have circled 15 ore bodies including 8 concealed ore bodies. 10 of them are Fe-ore-body and 5 are Zn-ore-body. All of the ore bodies are grown in volcanic rocks of early Permain Gadekao Formation. The volcanism formed six rhythmic layers in three effusive period according to the rock association. The genesis of the deposit is a volcanic plume (VMS) zinc polymetallic deposit, and volcanic rocks are the most important regional prospecting criteria. Source


Li H.-P.,Chinese Academy of Geological Sciences | Li H.-P.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | Zheng M.-P.,Chinese Academy of Geological Sciences | Hou X.-H.,Chinese Academy of Geological Sciences | Yan L.-J.,Chinese Academy of Geological Sciences
Acta Geoscientica Sinica | Year: 2015

The deep brine in Nanyishan area in the western part of the Qaidam Basin is a liquid deposit with extremely high economic value, characterized by enrichment of potassium, boron, lithium and bromine. Previous workers considered that the lithologic character of the strata in Nanyishan anticlinal structural area controls the distribution of deep potassium-rich brine. The study conducted by the authors reveal that the brine in this area is controlled by fault fissures developed in the anticlinal structure, with the depth range from Pliocene Shangyoushashan Formation to Oligocene Lower Ganchaigou Formation. With the formation mechanism and hydrochemical characteristics of the potassium-rich deep brine in E3g-N1y strata of Nanyishan anticlinal structure as the emphatic study objects and on the basis of field observation and sampling as well as indoor analysis, the authors made an integrated analysis of geological, hydrological and physical data provided by related geological and petroleum departments as well as the newest brine bed perforation data of old drill holes provided by Qinghai Oilfield Company in combination with sedimentary environment and geological structure of the brine-storage reservoir as well as hydrogeological and geochemical characteristics of potassium-rich deep brine. The results show that Nanyishan anticlinal structure in the western part of the Qaidam Basin experienced the evolution of deep lacustrine facies-semi-deep lacustrine facies-shallow lacustrine facies-tidal flat facies from Oligocene to Pliocene. The sedimentary environment decided the water character and water quality of the primary deep brine. Simultaneously with the formation of Nanyishan anticlinal structure, a series of longitudinal, transverse and bedding faults as well as corresponding structural cracks (fissures) were formed to serve as water-storage space for potassium-rich deep brine. Large quantities of chemical analytical data demonstrate that the deep brine in Annyishan anticlinal structure resulted from sedimentary metamorphism in a highly-closed reduction environment. ©, 2015, Science Press. All right reserved. Source


Hu S.Y.,Qingdao University | Zhao Q.S.,Qingdao University | Ma J.Y.,Qinghai AVIC Resources Company Ltd | Ma J.Y.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | And 2 more authors.
Water Resources and Environment - Proceedings of the International Conference on Water Resources and Environment, WRE 2015 | Year: 2016

The samples from pressurized brine in Mahai potash area were characterized by hydrochemical analysis. Based on their hydrochemical types and other analyzing results, the formation reason on the pressurized brine was inferred. By analyzing the scatter diagrams for the salinity and element concentration of pressurized brine, the change rules for the element concentration were found in the process of evaporating and concentrating the pressurized brine. Firstly, the element concentrations of Na+, Li+, SO2− 4 raise with increasing the salinity of pressurized brine. Secondly, the element concentrations of K+, Ca+ decrease with increasing the salinity of pressurized brine. Thirdly, the element concentrations of Rb+, Sr2+, HCO− 3 changes randomly with increasing the salinity of pressurized brine. By analyzing the correlation between these elements, it is found that the different elements have the same one replenishment sources. The results could be referenced in exploring and developing the potash salts of pressurized brine in Mahai potash area in Qinghai province. © 2016 Taylor & Francis Group, London. Source


Zheng M.-P.,Chinese Academy of Geological Sciences | Zhang X.-F.,Chinese Academy of Geological Sciences | Hou X.-H.,Chinese Academy of Geological Sciences | Wang H.-L.,Chinese Academy of Geological Sciences | And 2 more authors.
Acta Geoscientica Sinica | Year: 2013

The evolution of the lakes in the Tibetan plateau is dominated by the change of both the geological structure and the climate. Thus the lacustrine sediments can serve as a good recorder for both the past geological events and the climate change. Besides, the lacustrine sediments are strategic resources for salts, oils and gas. However, there had been no high resolution successive drilling core from the lacustrine sediments in the QT plateau that could reach a length of 1~2 km before this work. Since the beginning of this century, the authors have systematically collected 5 drilling cores with lengths of 1~2 km from the east and west Qaidam basin, and have obtained unprecedented rich information concerning the geological and climatic history of the Tibetan Plateau from these sedimentary cores. Through comparing the chronologic results with the latest international standard, a more precise model of magnetostratigraphy was established. Based on studying the cold, warm and eurythermal saline minerals in Qaidam basin, the authors found 31 series of cold events since 2 Ma BP. From that time Qaidam basin began to intermittently appear cold events. The time of cold events is close to the chronologic data of Cenozic Global Glaciation. The uplift of the Tibetan Plateau was tentatively divided into several stages according to the study of the deposition rate and the particle size. At the first time, the authors found that there was a demarcation line in the middle of Qaidam basin, which was not only the boundary of paleo-atmospheric circulations but also the boundary of salt formation. The westerly wind inclined area located to the north of the investigated line reflects salt deposits in the cold-wet climate period. To the west of the study area, the cold saline sediments occurred after 2 Ma, whereas they gradually crystallized into cold saline deposits at 0.72 Ma; in contrast, the saline sedimentary period started at 0.048 Ma in the south part of the boundary. The point of view is put forward in this paper that potassium was concentrated by the transportation of the multi-stage salt basin lying in the high mountain-deep basin environment, and this viewpoint can further improve the theory of potassium formation in continental facies. A new potash-rich brine horizon was found by the authors in the western Qaidam basin. Source


Zheng M.-P.,Chinese Academy of Geological Sciences | Hou X.-H.,Chinese Academy of Geological Sciences | Yu C.-Q.,Chinese Academy of Geological Sciences | Li H.-P.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | And 12 more authors.
Acta Geoscientica Sinica | Year: 2015

The salt formation theory has led to the breakthrough and important progress in potash deposit prospecting: a new type gravel brine layer rich in potassium was discovered in the early pre-Quaternary strata in Altun Mountains in the west of Qaidam Basin. This progress was made by the Salt Party of the Institute of Mineral Resources, Chinese Academy of Geological Sciences, headed by Professor ZhengMianping, academician of the Chinese Academy of Engineering, with such institutions as the Qaidam Comprehensive Exploration Institute of Geology and Mineral Resources as the co-researchers and under the joint support of geological survey projects and key projects of the National Natural Science Foundation of China. Drilling shows that it possesses the estimated resource quantity of 350 million tons and hence is likely to be the reserve base of potash salt in Qaidam Basin. Additionally, Paleogene potash-bearing ore beds with the thickness of 100 meters were found in Kuqa depression, Tarim, where there is a 41 meter-thick salt bed of potassium chloride that reaches industrial grade. Furthermore, Triassic polyhalite was found in Sichuan Basin, which is not only an important potassium source in deep brine rich in potash but also a precious slow-release potassium fertilizer. Besides, in Upper Yangtze River Basin, 13 potassium-rich brine deposits of brine-bearing structure were evaluated, and the potassium chloride resource is estimated to be 49.17 million tons. What is more, in Mengyejing of southwestern Yunnan Province, a "two-storey" potash-forming model was set up, and, in Ordovician salt basin of northern Shaanxi Province, the area of potash prospecting target area has been largely reduced, which shows the dawn of the breakthrough in marine potash prospecting. ©, 2015, Science Press. All right reserved. Source

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