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Qi Z.,Heilongjiang Province Institute of Regional Geological Survey | Feng Z.,Jilin University | Feng Z.,Taiyuan University of Technology | Wen Q.,Jilin University | And 4 more authors.
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2017

NE China was traditionally considered the eastern part of the Central Asian Orogenic Belt (CAOB) and was composed of different mico-blocks in the Paleozoic. There are some debates about the collision age and location between the Xing'an and Songliao-Nenjiang blocks in NE China. The discovery of the records of the Early Paleozoic magmatism is a key to solve the debates. Early Paleozoic diorites are indentified in this study in the Nenjiang area, western Heilongjiang Province. The LA-ICP-MS zircon U-Pb dating indicates an age of (435.3±1.1)Ma. The diorites have 55.01%-61.82 wt% SiO2, and 14.97%-16.67 wt% Al2O3, with Na2O+K2O=4.55%-6.94 wt%, and exhibit high Na2O/K2O and low FeOT/MgO (0.51-0.96) ratios, and moderate K2O (0.10%-2.12%), TiO2 (0.99%-1.42%), and P2O5 (0.33%-0.49%). These results indicate that the diorites belong to medium K calc-alkaline series. Their A/CNK and A/NK values range from 0.78 to 1.35 and 1.63 to 2.21 respectively, which are generally consistent with those of type I granites. The diorites display right-inclined rare earth element (REE) patterns (La/Yb)N=9.86-13.93, with relatively high total REE abundances (ΣREE=227.02×10-6-289.17×10-6), and week Eu anomalies (Eu/Eu*=0.88-1.02). In trace elements, the diorites are characterized by depletion in high field strength elements (HFSEs, such as Nb and Ti). The primary magma of the diorites in the northeast Nenjiang area was generated by partial melting of mantle wedge that had been metasomatized by subduction-related fluids. Integrating regional data and the research result of this study it is suggest that the Nenjiang diorites was formed in an active continental margin setting, resulting from subduction of the paleo Nenjiang-Heihe oceanic plate located between the Xing'an and Songliao blocks. © 2017, Science Press. All right reserved.

Tan C.-Y.,China University of Geosciences | Tan C.-Y.,Heilongjiang Province Mining Group Co. | Wang G.-H.,China University of Geosciences | Li Y.-S.,China University of Geosciences | Li Y.-S.,Heilongjiang Province Institute of Regional Geological Survey
Geological Bulletin of China | Year: 2010

Recently several geochemical anomalies showing resource potential of Au-Ag-Mo-Sb deposits were discovered in gold ore deposits of Xiaoniqiuhe, Sandaowanzi, Zhengguang, Tongshan, Shangmachang, Xiaoxintun. New progress and significance on the mineral exploration in Duobaoshan mineralization area, Heilongjiang, are summarized in the paper based on these results, thus to provide new evidences for the ore-exploration and resources potential analysis in this area.

Peng X.-D.,Fuzhou University | Li W.-W.,Sinopec | Li X.-M.,Fuzhou University | Shi C.-L.,Heilongjiang Province Institute of Regional Geological Survey
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2011

Based on discussing each unit of the lithostratigraphic rock composition, fossil assemblages and depositional environment from Mesozoic to Cenozoic in Wulaga fault-depression, Jiayin County, Heilongjiang Province, and comparison with other basins in SunwuJiayin and Songliao basin, the authors divided the Mesozoic and Cenozoic strata into three tectonic layers and five lithostratigraphic units, and discussed their distribution and evolution, and made the regional geological map. The Wulaga basin shows three significantly different basin evolution stages, during which the two distinct unconformities are recognised, namely: the unconformity between upper Cretaceous and Lower Cretaceous and between the Upper Cretaceous and Neogene, thus made three different types of basin evolution stages in Wulaga from Mesozoic to Cenozoic; they are Early Cretaceous rift basin evolution stage, the Late Cretaceous large scale inland depression, and Neogene inland basin evolution stages.

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