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JournalISSN: 1006-7493

Geological Journal of China Universitiesf 

About: Geological Journal of China Universitiesf is an academic journal. The journal publishes majorly in the area(s): Volcanic rock & Metamorphism. Over the lifetime, 113 publications have been published receiving 724 citations.

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Journal Article
TL;DR: Junggar Basin is one of the biggest oil and gas bearing basins in China as discussed by the authors, it is a Late Paleozoic, Mesozoic and Cenozoic compressional superimposed basin, experienced the effects Hercynian orogeny, indosinian, Yanshannian and Himalayan orogenisms and was rsulted in a complex tectonic frame work.
Abstract: Junggar Basin is one of the biggest oil and gas bearing basins in China. Junggar Basin lies among the Altaiorogen on south flank of Siberia plate, the Kazakstan plate and the Tianshan fold belt. It is a Late Paleozoic, Mesozoic, and Cenozoic compressional superimposed basin, experienced the effects Hercynian orogeny, indosinian, Yanshannian and Himalayan orogenisms and was rsulted in a complex tectonic frame work. Junggar Basin developed on the basis of Junggar terrain. The terrain consists of Precambrin crystal basement which was formed before 800Ma at least. It consists of "dual basement and four-layers structure". The crust thinning took place in some parts of the basin. So, the evolution falls into two stages i. e. the first stage, the evolution of the Junggar terrane and the second stage, the evolution of the basin. During the whole Lower Paleozoic, the terrane was in the stable evolution of the terrane. The terrain passed through three stages and came into being the Junggar Basin: (1) the terrane evolution; (2) the oceanic crust comsumption; (3) the accretion and collage of the terrain and the plates. Based on the structure-layers and the progress of the basin research, the formation and evolution of the J unggar Basin has divided into six stages: (1) the formation of the terrain; (2) the evolution of the terrain; (3) the collage of the terrain and the plates and the formation of the enbryonic; (4) foreland basin stage; (5) the intacontinental depression stage; (6) the regeneration foreland basin. The latter three stages are related to the accumulation of petroloum and nature gas.

53 citations

Journal Article
TL;DR: The orogenic mechanism and distinctive tectonic evolution of the Central Asian orogens are very important in further study of the continental geodynamics as mentioned in this paper, and the mineralization pattern and the metallogenic mechanism of this type of gold deposits, as well as the exploration direction are still unclear.
Abstract: Located in the core of the Eurasian continent, the Central Asian orogens are characterized by the mosaic structures of several Late Paleozoic geosutures (e.g., the Kalamaili, the Erqs, the Dalabute, the Bayingou, and the Honliuhe ophiolite belts) and the multiple Precambrian blocks (e.g., Tarim, Ili, Junggar, and Hami blocks or terranes), the coupling of the Mesozoic - Cenozoic orogens (e.g., Tianshan, Jungguar and Altay) and the basins (e.g. Tulufan, Tarim and Junggar). It is different not only from the Alpine - Himalayan mountains, which are formed by collision of large continents, but also from the Andean mountains resulted from subduction of wide oceanic plate beneath giant continent plate. Therefore, the Central Asian orogens must represent a new type orogenesis featured by amalgamation of multiple blocks such as Ili, Junggar and Hami. The orogenic mechanism and distinctive tectonic evolution of the Central Asian orogens are very important in further study of the continental geodynamics. It has been well documented that there are many super large ore deposits of various types concentrated in the Central Asian orogenic area, and that the Hercynian orogenesis had resulted in large scale mineralization in Central Asian territories. This indicates that the southwest China will play a more important role in providing China with new mineral resources in the twenty first century. The porphyry copper deposits, epithermal gold deposits and massive sulfide polymetallic deposits, which were considered as the predominant mineralization type in the Circum-Pacific Rim, have also been found in large quantity in the Central Asian orogens, such as the Balqash porphyry copper belt in Kazakhstan, the Ashele-Keketale massive sulfide Cu-Pb-Zn belt in Altay within China, the Tianshan epithermal gold deposit belt in China (including Axi, Shiyingtan, Yuxi and Mazhuangshan gold deposis in China). The mesothermal gold deposits associated with regionally metamorphosed terranes of different ages are recently argued being formed during compressional to transpressional deformation processes at convergent plate margins in accretionary and collisional orogens and are consequently called as the orogenic type of gold deposits. This type of gold deposits are also frequently found in the Central Asian orogens, e.g., the Kanggu'er-Wangfeng gold deposit belt in Tianshan, the Qrqs gold deposit belt in Altay (including 5 large gold deposits), etc. The carbonaceous stratabound type gold deposits represented by the Muruntau deposits in western Tianshan and the Sowaya'erdun in southern Tianshan are the most important gold reserves in the Central Asian areas, which have only been found to be of great economic significance in the Central Asian orogens. However, the mineralization pattern and the metallogenic mechanism of this type of gold deposits, as well as the exploration direction are still unclear now. These problems are attracting more and more attentions of scientists both from China and abroad. The metallogenesis during Central Asian orogenesis is a key to the development of continental geodynamics and regional metallogeny.

47 citations

Journal Article
TL;DR: In this article, the formation ages of the Qingshan formation in the Jiaolai volcanic basin have been determined accurately by employing the highly precise 40 Ar-39 Ar dating technique.
Abstract: Based on a case study of the Fenlingshan volcanic apparatus, the formation ages of volcanic rocks of the Qingshan Formation in the Jiaolai Basin have been determined accurately by employing the highly precise 40 Ar- 39 Ar dating technique. Investigation results demonstrate that the age of intermediate to alkaline potash rich volcanic rocks of the first cycle of the Qingshan Formation is 109.9±0.6 Ma; and the age of the acidic rhyolitic volcanic rocks of the second cycle of the Qingshan Formation is 108.2±0.6Ma. It is thus evidenced that volcanic rocks of the Qingshan Formation in the Jiaolai volcanic Basin are products of Early Cretaceous magmatism. The ages of volcanic rocks of the Qingshan Formation in Shandong province display a progressively younger tendency eastwards, suggesting that the Mesozoic subduction of the Izanagi plate towards the Eurasian plate is the main dynamic factor that controlled the volcanism in this region.

44 citations

Journal Article
TL;DR: In this paper, five types of volcanic petrotectonic assemblages in Sanjiang Orogenic Belt have been recognized as follows: Oceanic assemblage including MORB/Para MORB(or MORB Like) and OIB, island arc, continental marginal arc, fore arc, main arc, back arc and so on.
Abstract: Sanjiang Orogenic Belt is located geographically in the area of Jinshajiang, Lancangjiang and Nujiang (abbreviated from the “three rivers area”), and tectonically at the junction between the Himalaya Tethyan tectonic domain and the Pacific tectonic domain. It is one of the key areas to understand the Tethyan evolution, Indian Eurasia collision and the uplift of Tibet Plateau and its eastern extension. Various volcanic rocks of Proterozoic to Cenozoic age occur in Sanjiang Orogenic Belt. The majority of volcanic rocks, however, formed during the Tethyan and post Tethyan stages, i.e., from early Carboniferous to the Cenozoic. Volcanic petrotectonic assemblages as geological records and a lithoprobe play an important role in understanding tectonic evolution and corresponding deep processes of the Sanjiang area. Five types of volcanic petrotectonic assemblages in Sanjiang Orogenic Belt have been recognized as follows: Oceanic assemblages including MORB/Para MORB(or MORB LIKE) assemblage and OIB assemblage, island arc and continental marginal arc assemblage, collision related assemblage, post collisional assemblage and intracontinental assemblage. Fig 1 shows a frame of their spatial and temporal distribution. Sanjiang MORB and para MORB assemblages occur in four major suture zones, being closely associated with peridotite (or serpentinite), gabbro, diabase, radiolarian chert or deep water limestone, and sometimes accumulates in ophiolites. Geochemically, Sanjiang MORB are mainly E type MORB, although they have the lowest K 2O content and (La/Yb) N ratio among all types of volcanic rocks in Sanjiang Orogenic Belt. Para MORB is mainly tholeiites and geochemically more enriched in K 2O, LREE and incompatible elements than E MORB but less enriched than OIB. Sanjiang OIB occurs so far only in Changling Menglian belt and is associated with overlying limestone and sometimes underlying MORB/para MORB. They are mainly alkaline olivine basalts and the most enriched type in Na 2O+K 2O, LREE and incompatible elements among all types of oceanic volcanic rocks in Sanjiang Orogenic Belt. Island arc and continental marginal arc volcanic petrotectonic assemblage in Sanjiang orogenic belt is of high variety, although they are mainly composed of basalts, basaltic andesites, andesites, dacites and rhyolites, belonging to calc alkaline or island arc tholeiitic series. Arc volcanic rocks in Sanjiang Orogenic Belt formed in various environments, such as oceanic island arc, continental island arc, continental marginal arc, fore arc, main arc, back arc and so on. Among them, it was particularly important to recognize tensional arcs in Sanjiang Orogenic Belt. A typical example of tensional arcs is Yidun arc formed in Late Triassic, which is characterized by an intra arc rifting with a bimodal volcanic suit. A large Kuroko type Pb Zn Ag ore field was developed within the intra arc rifting basin (see Fig.7 in text). The southern end of Yidun Arc, however, became a compressive one associated with many porphyry type copper deposits. It is also amazing to see a special type of volcanic rocks, which contain strong subduction zone components (SZC) but formed in post collisional intra continental environments. We therefore called it "post collisional arc volcanic rocks" or "delayed arc volcanic rocks". Condie et al(1989), Aldrich et al(1986) reported similar cases in Kaapvaal of South Africa and in Rio Grande rift, respectively. A possible explanation for the delay of arc type volcanism and for the formation of post collisional arc volcanic rocks was presented ( see Fig.8 in text). It is apparently that geotherm in the source region during the subduction was too low to reach the solidus of source rock. The subducted or collapsed slabs, however, might react with surrounding mantle and become a new source rock for magma generation afterwards. In post collisional stage some kind of geological events such as upwelling, convection, intra continental convergence/subduction might cause generation of magmas, whi

39 citations

Journal Article
TL;DR: Yinggehai basin is located in the northwest of South China Sea, and formed in the Cenozoic as mentioned in this paper, and the structural features related to rifting phase are difficult to reveal by seismic profiling.
Abstract: Yinggehai basin is located in the northwest of South China Sea, and formed in the Cenozoic. The Cenozoic sedimentary thickness in the basin is more than 15km, therefore, the structural features related to rifting phase are difficult to reveal by seismic profiling. In order to understand its origin and evolution, we analysed the regional characteristics of the Cenozoic tectonic evolution surrounding Yinggehai basin, and obtained the Cenozoic tectonic stress field of the basin.The formation and tectonic stress field of Yinggehai basin can be divided into four phases. The first phase, from the later Paleocene to the early Oligocene, Indochina block extruded toward southeast fast, with a clockwise rotation movement. Yinggehai basin origined in this stage. The second phase, from the later Oligocene to the early Miocene, Indochina block's southeastward extrusion slowed down gradually. However, South China block was relatively stable and Yinggehai basin was under a left slip shearing condition. The third phase, during the middle and the later Miocene, with the Indochina block intruding into Eurasia plate gradually, Indochina peninsula's extrusion slowed down further. At the end of the middle Miocene, South China block began to extrude integrally. The last phase, from the Pliocene to the Quaternary period, Indochina block was relatively stable, South China block's extrusion continues, the relative movement of these two blocks is right slip shearing. The Cenozoic evolution of tectonic stress field of Yinggehai basin is controlled by the interaction between Pacific plate, India plate and Eurasia plate. Most of all, the relative movement between Indochina and South China block resulted from the India Eurasia collision is the dominate factor of the Cenozoic tectonic stress field controlling the origin and evolution of Yinggehai basin.

36 citations

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No. of papers from the Journal in previous years
YearPapers
200231
200137
200044
19971