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Liu C.,Henan Institute of Geological Survey | Cai Z.,Henan Institute of Geological Survey | Ji Q.,Henan Institute of Geological Survey | Tian L.,No. 2 Geological Party | And 3 more authors.
Northwestern Geology | Year: 2015

The Zhangjiashan iron deposit in Lushi country is a limonite deposit, which is first found in the processes of implementing the metallogenic prospective survey in Lushi area of Henan Province. There are several limonite ore-bodies in the Zhangjiashan deposit, which are associated molybdenum and zinc abnormities. The wall rocks of iron ore-bodies are a set of epimeta morphic rock series occurred in Dongpo Formation of Sinian System, which is dominated by siltymaterials with high carbonaceous. The analyzed results show that, the SiO2/Al2O3 values of the carbonaceous phyllite from iron ore and wall rock are similar, the n (Al2O3)/n (Al2O3+Fe2O3) values mainly range from 0.6 to 0.9, most of SiO2/Al2O3 ratios are less than 5, and the K2O contents are more than Na2O contents in the most samples. For the trace elements, the Sr/Ba ratiosindicate that these carbonaceous phyllites were mainly sourced from terrigenous sediment. The rare earth distribution patterns of these phyllites are similar, showing the enrichment of LREE and the obvious loss of Eu. The iron was formed in the semi-closed limited oceanic basin-bathyal environment, which was relatively quiet (less volatile) and alternated with oxidation and weak reduction. The iron ore and C phyllite arederived from terrigenous sediment, with small part of them might be related with volcanism. The dolomitic limestones in the Xunjianshi Formation of Guandaokou Group were the results of marine deposition, which may be different from iron ore and C phyllite.

Qiao G.-B.,Xian Center | Wang P.,Petrochina | Wu Y.-Z.,Xian Center | Hao Y.-H.,No. 2 Geological Party | And 4 more authors.
Geology in China | Year: 2015

The Bulunkuole Group is one of the main components of Taxkorgan landmass in the Western Kunlun area, and is also important ore-bearing strata of the regional iron deposits. Recently, many large-sized iron deposits were found within the Bulunkuole Group, such as Zankan, Laobing, Mokaer and Yelike iron deposits. On the basis of detailed petrography features and SHRIMP U-Pb zircon dating of metamorphic rock and magmatic rock in the intrusion strata of the Bulunkuole Group from the Zankan iron deposit, the authors discussed the formation age of ore-bearing strata, and investigated the ore-forming age. The results show that the formation age of the representative magmatic zircon from plagioclase-hornblende schist in Bulunkuole Group is (1845.0±11.0) Ma, suggesting that ore-bearing strata are younger than (1845.0±11.0) Ma. Zircon SHRIMP dating of plagiogranite porphyry that intruded into the strata yielded a U-Pb age of (544.5±4.7) Ma, suggesting that the ore-bearing strata are older than (544.5±4.7) Ma. Thus the ore-bearing strata were formed during 1845.0-544.5 Ma. Moreover, SHRIMP dating of the zircon core from dacite yielded U-Pb ages of 3048.0-3054.0 Ma and 2032.0 Ma, indicating that there possibly exists an early Proterozoic or Archean basement in the surveyed area and adjacent areas, which is of important significance for recognizing Bulunkuole Group and the basement of Taxkorgan landmass. Bulunkuole Group outcropped in Taxian-Waqia uplift zone is one of the earliest strata in Western Kunlun Mountains, and this provides a basis for the existence of Taxkorgan paleo-landmass. Comparative researches on different types of deposits indicate that the Zankan iron deposit was mainly produced by the sedimentary mineralization process, and iron bodies with iron-bearing rocks of Bulunkuole Group were syngenetic, and hence the mineralization age of the Zankan iron deposit is Proterozoic, which is in accordance with the formation age of Bulunkuole Group and is also a very important period for the generation of global iron deposits.

Cheng Y.-B.,China University of Geosciences | Mao J.-W.,Chinese Academy of Geological Sciences | Chen X.-L.,No. 2 Geological Party | Li W.,No. 2 Geological Party
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2010

The LA-ICP-MS zircon U-Pb dating of three samples from the Bozhushan complex granite intrusion, in Southeastern Yunnan Province, constrains the emplacement age of the intrusion. The 206Pb-238U mean data of the sample CYB0808079 is (86.51 ± 0.52) Ma and the MSWD value is 2.4, the sample CYB0808084 is (87.54 ± 0.65) Ma and the MSWD value is 1.6, as well as the sample CYB0808079 is (87.83 ± 0.89) Ma and the MSWD value is 0.15. These chronology data are consistent with the magmatism and mineralization in the area, and supply the reasonable isotopic age for the Bozhushan complex granite. It is demonstrated that the Bozhushan and other grantic intrusion as well as associated supergiant Gejiu, Dachang and Dulong tin-polymetallic deposits were formed during the Late Cretaceous period. Both the magmatism and large scale mineralization are the components of the western South China metallogenic belt in the Late Cretaceous period.

Li B.,No. 2 Geological Party | Chao D.-C.,7Th Geological Party | Li Y.-F.,Henan Institute of Geology and Nonferrous Metal Exploration | Luo Z.-Z.,Henan Institute of Geology and Nonferrous Metal Exploration | Shang L.-G.,No. 2 Geological Party
Geology in China | Year: 2013

This paper has described the application of controlled source audio -frequency magnetotellUurics (CSAMT) and transient electromagnetic sounding TEM to the detection and exploration prognosis of iron deposits in Wuyang - Wanglou and Xiaohan Village areas of Henan Province. The results show that using CSAMT and TEM in search for concealed meta-sedimentary iron deposits is feasible. Under the same geological conditions, the line source TEM has the largest effective detection depth, followed by CSAMT, and the central loop TEM is the most ineffective. The TEM method is more influenced by the interference of the low resistivity body than the CSAMT method, but its vertical resolution is better than that of the CSAMT method. With Jingshansi, Xiaohan Village and Lenggang areas as the center, the authors used CSAMT to predict deep concealed ore bodies in the strong interference segment of the iron ore mining area, and the results provide a basis for the next step deolovment of exnloration work.

Shang J.-G.,No. 2 Geological Party | Li B.,No. 2 Geological Party | Feng L.,No. 2 Geological Party
Geology in China | Year: 2011

This paper mainly deals with the process of using dual -frequency induced polarization in rapid exploration of the mountain area of western Henan Province with the purpose of finding ore bodies and the problems worthy of attention in the field engineering. Through dual -frequency?induced polarization intermediate gradient survey, three induced polarization anomalies in the working area was discovered. An integrated analysis of the induced polarization anomalies was also made on the basis of local geological data, physical properties of rocks and geochemical secondary halos. Drilling has proved that the anomalies are related to concealed molybdenum ore bodies and molybdenum mineralization. It is also proved that dual-band induced polarization can be fully adapted to the rapid exploration and evaluation of the mountain area of western Henan Province with good results achieved.

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