scholarly journals Mineralization Epochs of Granitic Rare-Metal Pegmatite Deposits in the Songpan–Ganzê Orogenic Belt and Their Implications for Orogeny

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 280 ◽  
Author(s):  
Peng Li ◽  
Jiankang Li ◽  
I-Ming Chou ◽  
Denghong Wang ◽  
Xin Xiong
Keyword(s):  
Thermal Stress ◽  
Large Scale ◽  
Rare Metal ◽  
Orogenic Belt ◽  
Granitic Magma ◽  
North China Block ◽  
Slow Cooling ◽  
Plate Convergence ◽  
The North ◽  
Rare Metal Pegmatite

Granitic pegmatite deposits, which are usually products of orogenic processes during plate convergence, can be used to demonstrate regional tectonic evolution processes. In the eastern Tibetan Plateau in China, the Jiajika, Dahongliutan, Xuebaoding, Zhawulong, and Ke’eryin rare metal pegmatite deposits are located in the southern, western, northern, midwestern, and central areas of the Songpan–Ganzê orogenic belt, respectively. In this study, we dated two muscovite Ar–Ar ages of 189.4 ± 1.1 Ma and 187.0 ± 1.1 Ma from spodumene pegmatites of the Dahongliutan deposit. We also dated one zircon U-Pb age of 211.6 ± 5.2 Ma from muscovite granite, two muscovite Ar–Ar ages of 179.6 ± 1.0 Ma and 174.3 ± 0.9 Ma, and one columbite–tantalite U-Pb age of 204.5 ± 1.8 Ma from spodumene pegmatites of the Zhawulong deposit. In addition, we dated one muscovite Ar–Ar age of 159.0 ± 1.4 Ma from spodumene pegmatite of the Ke’eryin deposit. Combining these ages and previous studies in chronology, we concluded that the granitic magma in the Jiajika, Xuebaoding, Dahongliutan, Zhawulong, and Ke’eryin deposits intruded into Triassic metaturbidites at approximately 223, 221, 220–217, 212, and 207–205 Ma, respectively, and that the crystallization of the corresponding pegmatite ceased at approximately 199–196, 195–190, 189–187, 180–174, and 159 Ma, respectively. In this study, we demonstrated that the peak in magmatic activity and the final crystallization age of the pegmatite lagged behind one another from the outer areas of the orogeny belt to the inner areas. The pegmatite–parented granitic magmas were sourced from Triassic metaturbidites that were melted by shear heating along the large-scale decollement resulting from Indosinian collisions along the North China block, Qiangtang–Changdu block, and Yangtze block. As a result, the above temporal and spatial regularities indicated that the tectonic–thermal stress resulting from the collisions of three blocks was transferred from the outer areas of the orogenic belt to the inner areas. A large amount of heat and a slow cooling rate at the convergent center of thermal stress in two directions will lead to crystallization and differentiation of magma in the Songpan–Ganzê orogenic belt, forming additional rare metal deposits.

Regional Geology Background and Minerogenetic Series in Ongniud Banner of Inner Mongolia

2013 ◽  
Vol 734-737 ◽  
pp. 408-417
Author(s):  
Deng Liu ◽  
Dai Yong Cao
Keyword(s):  
Single Particle ◽  
North China ◽  
Research Area ◽  
Orogenic Belt ◽  
Stratigraphic Correlation ◽  
North China Block ◽  
Northern Margin ◽  
The North ◽  
Geological Unit ◽  
Chlorite Schist

Ongniud Banner is located in the northern margin of the North China platform, possessing binary attribute of the greenville period orogenic belt and North China block. The authors reclassify geological unit through the rock stratigraphic correlation and isotope chronology. Achaean strata is mainly composed of quartz schist, chlorite schist, amphibole schist, and the rocks have been highly metamorphosed into the green schist facies, and its single particle zircon U-Pb age is 2645 ±86Ma, so it is assigned to North China block. Proterozoic strata is mainly composed of metamorphic complex including chlorite schist, marble, basalt, amphibolite, plagiogranite and olivine pyroxenolite, and its single particle zircon U-Pb age is 1620±160Ma, so it is assigned to Greenville period orogenic belt. According to 1:50000 stream sediment geochemical elementary assemblage characteristics, the authors discuss the metallogenic endowment and minerogenetic series of geological unit in research area.

Partial Melts of Intermediate–Felsic Sources in a Wedged Thickened Crust: Insights from Granites in the Sulu Orogen

2020 ◽  
Vol 61 (5) ◽  
Author(s):  
Hongjie Wu ◽  
Yongsheng He ◽  
Shuguang Li ◽  
Chuanwei Zhu ◽  
Zhenhui Hou
Keyword(s):  
High Pressure ◽  
Large Scale ◽  
North China Block ◽  
Northern Margin ◽  
The North ◽  
Tanlu Fault ◽  
Wedge Structure ◽  
Partial Melts ◽  
Zircon Thermometry ◽  
Orogenic Belts

Abstract High-pressure (>15 kbar) melts of intermediate–felsic materials have been well studied by experiments, whereas their existence in nature, especially in orogenic belts, is rarely examined. With the aim of identifying and characterizing high-pressure partial melts of intermediate–felsic continental crusts, this study presents comprehensive geochemical and geochronological data for 47 Jurassic granites (166∼157 Ma) from the Sulu orogen. These Sulu Jurassic granites (SJG) consist of quartz, K-feldspar and plagioclase with minor mineral assemblages of biotite ± muscovite ± garnet ± epidote ± allanite. Their low mafic mineral abundance, high SiO2 and Al2O3, and low FeOt + MgO contents show leucogranite-like affinities. They have low Mg#, low Rb/Sr, and mildly peraluminous features, collectively suggesting an intermediate–felsic orthogneissic source. Whole-rock Zr saturation thermometry and Ti-in-zircon thermometry together suggest initial magma temperatures between 695 ± 32 °C and 751 ± 27 °C (1 standard deviation), indicating derivation from water-present melting. The SJG notably feature high Sr contents (average 792 ppm), high Sr/CaO ratios (average 476) as well as inter-correlated low REE concentrations (average ΣREE 87 ppm), low Th concentrations (average 5·1 ppm) and positive Eu anomalies (Eu/Eu* up to 2·94). These characteristics are best explained by partial melting of intermediate–felsic sources under high pressure (>15 kbar), leaving residuum where feldspar is sparse or absent and allanite is present. Inherited zircon age spectra and Sr–Nd–Pb isotopic compositions suggest that their source components could be mainly the Triassic orthogneisses whose protoliths are from the northern margin of the South China Block, probably in a wedge structure where the exhumed felsic slabs were wedged into the crust of the North China Block in the middle–late Jurassic and formed a stacked thickened crust. The wedge structure was most probably driven by synchronous large-scale strike-slip of the Tanlu fault, as a far-field effect of the oblique subduction of the paleo-Pacific plate. The characteristic chemical features observed in this study may be applied to identifying partial melts with similar petrogenesis elsewhere.

Enigma of the Jurassic monster shift of the North China block

2020 ◽  
Author(s):  
Shihong Zhang ◽  
Yangjun Gao ◽  
Qiang Ren
Keyword(s):  
North China ◽  
Rotation Axis ◽  
Eastern Asia ◽  
North China Block ◽  
Polar Wander ◽  
Plate Convergence ◽  
True Polar Wander ◽  
The North ◽  
Geochronological Study ◽  
Oceanic Plates

<p>Accumulation of the global paleomagnetic data, from both continental and oceanic plates, may suggest a true polar wander (TPW) event in Jurassic, with a rotation axis located in the present northwestern Africa, but no consensus has been reached regarding to the initiation, duration and velocity of the TPW. As one of the eastern Asian blocks, the north China block (NCB) is then located far from the rotation axis of the TPW and the plate convergence between Siberia and the Amur-NCB, known as the subduction in the Mesozoic Okhotsk-Baikal ocean, did exist. Paleogeographic changes observed of the eastern Asian blocks in Jurassic thus should contain the TPW component and plate moving component. To better estimate the influence of the TPW in the Eastern Asia blocks, we carried out a new paleomagnetic and precision U-Pb geochronological study on the middle Jurassic lavas in the NCB. Being profoundly different to the recent paleogeographic model (Yi et al., 2019, https://doi .org/10.1130/G46641.1) that suggest that the NCB experienced a large latitudinal displacement (monster-shift) responding to the TPW event between ~174 and ~157 Ma, we suggest that the NCB, as well as other blocks already connected with it, do not record any monster-shift between ~170 and ~160 Ma. The strata, ranging from 160 to 145 Ma, however, yield considerable paleomagnetic variations and need further investigation.</p>

scholarly journals Provenance and tectonic implications of the Yanshi bauxite area in Western Henan, China

2021 ◽  
Vol 261 ◽  
pp. 03058
Author(s):  
Fengyu Sun ◽  
Gaoshe Cao ◽  
Qikai Zhou
Keyword(s):  
North China ◽  
Orogenic Belt ◽  
Detrital Zircons ◽  
Early Paleozoic ◽  
North China Block ◽  
Qinling Orogenic Belt ◽  
The North ◽  
Icp Ms ◽  
Study Support ◽  
North Qinling

The bauxite layer in Western Henan supplies a large number of bauxite ores and is useful for studying tectonic movement. In this paper, the bauxite samples were selected to carry out LA-ICP-MS detrital zircons U-Pb dating and Hf isotope testing. The results indicated that the detrital zircons with the Early Paleozoic ages were mainly derived from the North Qinling Orogenic Belt. The detrital zircons of the Precambrian age may be derived mainly from the basement of the North China Block and the North Qinling Orogenic Belt. The results of this study support the opinion that the North Qinling Orogenic Belt has been uplifted at ~310 Ma, and the surface of the southern craton has an overall north-dipping topography at this time.

Provenance of Carboniferous strata (the Meishan Group) on the northern margin of the Dabie orogenic belt and implications of oblique convergence between the North and South China blocks

2021 ◽  
Vol 91 (9) ◽  
pp. 1010-1023
Author(s):  
Cheng Cheng ◽  
Shuangying Li ◽  
Xiangyang Xie ◽  
Yanlin Lu ◽  
Arthur B. Busbey ◽  
...  
Keyword(s):  
South China ◽  
Orogenic Belt ◽  
South China Block ◽  
The South ◽  
North China Block ◽  
Northern Margin ◽  
The North ◽  
Dabie Orogenic Belt ◽  
Oblique Convergence ◽  
North And South

ABSTRACT The newly defined Carboniferous Meishan Group, along the northern margin of the Dabie orogenic belt, provides unique opportunities to document the poorly understood Paleozoic tectonic evolution of the Dabie orogenic belt and the Paleozoic convergence between the North and South China blocks. We apply sandstone petrology, geochemistry, and U-Pb detrital-zircon geochronology to constrain the provenance of the Carboniferous Meishan Group and to document its potential tectonic significance. We conclude that the Meishan Group received most sediment directly from early Paleozoic continental island arc rocks that are currently missing in the Dabie orogenic belt, with minor contributions from middle Neoproterozoic magmatic rocks of the South China Block and recycling of Archean to Proterozoic basement rocks of both the North and South China blocks. Compilation and comparison of detrital zircons and geochemistry data of the Silurian–Devonian and Carboniferous units suggests that all of them share similar source areas, but that individual contributions from each source were different. These results support the hypothesis that the Dabie orogenic belt developed a similar Paleozoic accretionary system, and shares a similar tectonic history, with the Qinling orogenic belt. These provenance patterns can be explained by a model of oblique convergence between the North and South China blocks during the Paleozoic. The South China Block was obliquely subducted beneath the North China Block with its opening to the east, forming an eastward-widening sedimentary basin. As a result, the eastern part of the basin received more sediment from the northern passive margin of the South China Block, while the western part of the basin received more material from the southern active margin of the North China Block.

Late Paleozoic oroclinal bending, arc amalgamation, and large-scale transcurrent tectonics in the western Central Asian Orogenic Belt: termination of accretionary orogenesis and initiation of aridification in Central Asia?

2021 ◽  
Author(s):  
Pengfei Li
Keyword(s):  
Central Asia ◽  
Large Scale ◽  
Development Program ◽  
Orogenic Belt ◽  
Central Asian Orogenic Belt ◽  
Late Paleozoic ◽  
International Partnership ◽  
The North ◽  
Central Asian ◽  
Current Coordinate

<p>The western Central Asian Orogenic Belt (CAOB) underwent the prolonged accretion from Neoproterozoic to latest Paleozoic, and evolved into an intracontinental orogenic environment in the Mesozoic to Cenozoic, which was accompanied by significant changes of climatic environments. To constrain earlier accretion mechanisms and processes of the CAOB is fundamentally important given its control on the orogenic architecture and paleogeography, which inevitably affects the subsequent intracontinental orogeny. Here, I focus on the late Paleozoic tectonic reconstruction of the western CAOB with an aim to understand the role of oroclinal bending, arc amalgamation, and large-scale transcurrent tectonics in shaping the orogenic architecture of the western CAOB. My results show that the development of the U-shaped Kazakhstan Orocline in the western CAOB may have been controlled by the along-strike variation of the trench retreat, which was accompanied by the consumption of the Junggar Ocean in the core area of the orocline. The subsequent amalgamation of multiple arcs in the western CAOB may further amplify the oroclinal structure, and I emphasize that the orogen-parallel extension plays a significant role in arc amalgamation of the western CAOB. In the Permian, the large scale of strike-slip faults characterized the western CAOB with sinistral shearing in the north (Chinese Altai) and dextral kinematics in the south (Tianshan), which together indicates the eastward migration of orogenic materials (current coordinate). Following the termination of accretionary orogeny, the western CAOB was in an intracontinental environment with relatively arid climate in the early to middle Triassic as indicated by the widespread occurrence of red beds, which may mark the initiation of aridification in Central Asia.</p><p>Acknowledgements: this study was financially supported by the Hong Kong Research Grant Council (HKU17302317), the international partnership program of the Chinese Academy of Sciences (132744KYSB20200001), the National Key Research and Development Program of China (2017YFC0601205), the National Natural Science Foundation of China (41872222) and a project from Guangdong Province (2019QN01H101).</p>

Geology and geochronology of the super-large Bailongshan Li–Rb–(Be) rare-metal pegmatite deposit, West Kunlun orogenic belt, NW China

Lithos ◽  
2020 ◽  
Vol 360-361 ◽  
pp. 105449 ◽  
Author(s):  
He Wang ◽  
Hao Gao ◽  
Xiao-Yu Zhang ◽  
Qing-He Yan ◽  
Yigang Xu ◽  
...  
Keyword(s):  
Rare Metal ◽  
Orogenic Belt ◽  
Nw China ◽  
West Kunlun ◽  
Rare Metal Pegmatite

RECOGNITION OF A 600-KM-LONG LATE TRIASSIC RARE METAL (Li-Rb-Be-Nb-Ta) PEGMATITE BELT IN THE WESTERN KUNLUN OROGENIC BELT, WESTERN CHINA

2022 ◽  
Vol 117 (1) ◽  
pp. 213-236
Author(s):  
Qing-He Yan ◽  
He Wang ◽  
Guoxiang Chi ◽  
Qiang Wang ◽  
Huan Hu ◽  
...  
Keyword(s):  
Rare Metal ◽  
Orogenic Belt ◽  
Western China ◽  
Late Triassic ◽  
Tectonic Zone ◽  
Western Kunlun ◽  
Rare Metal Mineralization ◽  
Granitic Intrusions ◽  
Tethys Ocean ◽  
Rare Metal Pegmatite

Abstract The rising demand of strategic metals, especially lithium, necessitates discovery of new resources to meet the global supply chain. Recently, several pegmatite-hosted rare metal (Li-Rb-Be-Nb-Ta) deposits have been discovered in the Western Kunlun orogenic belt, making it a new world-class rare metal resource (estimated ~7 Mt Li2O and 0.16 Mt BeO). Understanding the metallogenesis of this belt is critical to further evaluate the rare metal potential. In this study, columbite-tantalite (coltan) and monazite from rare metal pegmatites and zircon from potential parental granites were collected from five representative rare metal pegmatite deposits in the western, middle, and eastern parts of the Western Kunlun orogenic belt for U-Pb geochronology. The results indicate that despite the distances of the sampling localities in different parts of the Western Kunlun orogenic belt, the ages of pegmatite-hosted rare metal mineralization fall in a narrow range of ca. 208–204 Ma. These rare metal pegmatites are temporally and spatially related to adjacent postorogenic granites emplaced following the closure of the Paleo-Tethys Ocean. The compositional characteristics of K-feldspar, biotite, and muscovite of the granites and pegmatites, along with regional mineralogical and textural zonation of the pegmatites, suggest that the rare metal pegmatites were derived from the volumetrically much more important, highly fractionated granitic intrusions. We propose that, in combination with the data from previous studies, the 218–204 Ma interval represents a newly recognized rare metal metallogenic period linked with granitic intrusions in the Western Kunlun orogenic belt, revealing a 600-km-long late Triassic rare metal pegmatite belt composed of multiple ore fields formed in a similar metallogenic setting. These results emphasize the importance of identifying fertile, Late Triassic to Early Jurassic granitic intrusions for rare metal pegmatite exploration. Furthermore, combined with recent studies on the Songpan-Ganzi rare metal pegmatite belt along the eastern segment of the Paleo-Tethys, this study further highlights the great potential of rare metal resources in this global tectonic zone.

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