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.

Mesozoic Hydrothermal Overprint on Carboniferous Bauxite in China

2020 ◽  
Author(s):  
Ruixue Wang ◽  
Qingfei Wang ◽  
I. Tonguç Uysal ◽  
Erick Ramanaidou ◽  
Jun Deng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Raman Spectra ◽  
South China ◽  
Intensity Ratio ◽  
North China ◽  
South China Block ◽  
The South ◽  
North China Block ◽  
The North ◽  
North And South

Abstract Bauxite is the world’s main source of aluminum and typically consists of gibbsite, boehmite, and minor amounts of diaspore. However, bauxite deposits from the North and South China blocks consist mostly of diaspore and associated minerals, including anatase and illite. Much of this illite is authigenic and occurs as three polytypes (1M, 1Md, and 2M1), with Kübler indices ranging from 0.23 to 0.47 indicating precipitation temperatures of 175° to 300°C. The Raman spectra of anatase show an intensity ratio of <1.5 for G (~1,600 cm–1) and D bands (~1,350 cm–1) diagnostic of organic matter, suggesting its presence during bauxite sedimentation followed by heating (165° to 270°C). The K-Ar ages of authigenic illite from the South China block (178–137 Ma) and the North China block (214–203 Ma) are synchronous with known regional Mesozoic tectono-thermal events generating hydrothermal overprints resulting in (1) the formation of illite, (2) the conversion of some diaspores from thermal of gibbsite and boehmite, and (3) the heating of anatase postsedimentation of the Carboniferous bauxites.

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.

scholarly journals Proterozoic−Phanerozoic tectonic evolution of the Qilian Shan and Eastern Kunlun Range, northern Tibet

2021 ◽  
Author(s):  
Chen Wu ◽  
Jie Li ◽  
Andrew V. Zuza ◽  
Peter J. Haproff ◽  
Xuanhua Chen ◽  
...  
Keyword(s):  
South China ◽  
Tectonic Evolution ◽  
North China ◽  
The South ◽  
The North ◽  
South China Craton ◽  
Late Neoproterozoic ◽  
North And South ◽  
North Qilian ◽  
Early Neoproterozoic

The Proterozoic−Phanerozoic tectonic evolution of the Qilian Shan, Qaidam Basin, and Eastern Kunlun Range was key to the construction of the Asian continent, and understanding the paleogeography of these regions is critical to reconstructing the ancient oceanic domains of central Asia. This issue is particularly important regarding the paleogeography of the North China-Tarim continent and South China craton, which have experienced significant late Neoproterozoic rifting and Phanerozoic deformation. In this study, we integrated new and existing geologic field observations and geochronology across northern Tibet to examine the tectonic evolution of the Qilian-Qaidam-Kunlun continent and its relationships with the North China-Tarim continent to the north and South China craton to the south. Our results show that subduction and subsequent collision between the Tarim-North China, Qilian-Qaidam-Kunlun, and South China continents occurred in the early Neoproterozoic. Late Neoproterozoic rifting opened the North Qilian, South Qilian, and Paleo-Kunlun oceans. Opening of the South Qilian and Paleo-Kunlun oceans followed the trace of an early Neoproterozoic suture. The opening of the Paleo-Kunlun Ocean (ca. 600 Ma) occurred later than the opening of the North and South Qilian oceans (ca. 740−730 Ma). Closure of the North Qilian and South Qilian oceans occurred in the Early Silurian (ca. 440 Ma), whereas the final consumption of the Paleo-Kunlun Ocean occurred in the Devonian (ca. 360 Ma). Northward subduction of the Neo-Kunlun oceanic lithosphere initiated at ca. 270 Ma, followed by slab rollback beginning at ca. 225 Ma evidenced in the South Qilian Shan and at ca. 194 Ma evidenced in the Eastern Kunlun Range. This tectonic evolution is supported by spatial trends in the timing of magmatism and paleo-crustal thickness across the Qilian-Qaidam-Kunlun continent. Lastly, we suggest that two Greater North China and South China continents, located along the southern margin of Laurasia, were separated in the early Neoproterozoic along the future Kunlun-Qinling-Dabie suture.

Chapter 35: Gold Deposits of the Jiaodong Peninsula, Eastern China

2020 ◽  
pp. 753-774
Author(s):  
Kun-Feng Qiu ◽  
Richard J. Goldfarb ◽  
Jun Deng ◽  
Hao-Cheng Yu ◽  
Zong-Yang Gou ◽  
...  
Keyword(s):  
South China ◽  
North China ◽  
Gold Mineralization ◽  
Eastern China ◽  
Gold Deposits ◽  
Fault System ◽  
South China Block ◽  
North China Block ◽  
The North ◽  
Basement Rocks

Abstract The Jiaodong gold province, within the eastern margin of the North China block and the translated northeastern edge of the South China block, has a stated premining gold resource exceeding 4,500 metric tons (t). It is thus one of the world’s largest gold provinces, with a present cumulative annual production estimated at 60 t Au. More than 90% of the Jiaodong gold resource is hosted by batholiths and related bodies of the Linglong (ca. 160–145 Ma) and, to a lesser degree, Guojialing (ca. 130–122 Ma) suites. The intrusions were emplaced into high-grade metamorphic basement rocks of the Precambrian Jiaobei (North China block) and Sulu (South China block) terranes during a 70-m.y.-period of lithospheric delamination, extensional core complex formation, and exhumation. The deposits are located about 20 to 200 km to the east of the continental-scale NNE-striking Tancheng-Lujiang (Tan-Lu) strike-slip fault system. They occur along a series of more regional NNE- to NE-striking brittle and ductile-brittle faults, which appear to intersect the Tan-Lu main structure to the southwest. This system of early to middle Mesozoic regional thrust faults, reactivated during Cretaceous normal motion and ore formation, tends to occur along the margins of the main Linglong batholiths or between intrusions of the two suites of granitoids. Orebodies are mainly present as quartz-pyrite veins (Linglong-type) and as stockwork veinlets and disseminated mineralization (Jiaojia-type). The two mineralization styles are transitional and may be present within the same gold deposit. The ca. 120 Ma timing of gold mineralization correlates with major changes in plate kinematics in the Pacific Basin and the onset of seismicity along the Tan-Lu fault system, with the enormous fluid volumes and associated metal being derived from sediment devolatilization above the westerly subducting Izanagi slab.

scholarly journals Clinical and Epidemiological Investigation of TCM Syndromes of Patients with Coronary Heart Disease in China

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Yi Ren ◽  
Minzhou Zhang ◽  
Keji Chen ◽  
Shijie You ◽  
Jianjun Li ◽  
...  
Keyword(s):  
Coronary Heart Disease ◽  
Heart Disease ◽  
South China ◽  
Blood Stasis ◽  
Deficiency Syndrome ◽  
Blood Stasis Syndrome ◽  
The South ◽  
The North ◽  
Tcm Syndrome ◽  
North And South

To compare the regional differences in TCM syndromes of patients with coronary heart disease (CHD) between North and South China. A total of 624 patients with a diagnosis of CHD, confirmed by coronary angiography, were included in the comparative analysis to determine the occurrence pattern, characteristics of TCM syndrome distribution, and differences in syndrome combinations and major syndrome types (deficiency or excess) between North and South China. The incidence of CHD tended to be higher in North China (54.6%) compared with that in South China (45.4%). The proportions of patients with a qi-deficiency syndrome (83.7%), turbid phlegm syndrome (68.9%), or blood stasis syndrome (91.5%) were generally higher in the South group, while the proportion of patients with a cold congelation syndrome (7.9%) was identified to be obviously higher in the North group (P<0.01). Moreover, compared with that in the South group, the overall frequency of syndrome combinations tended to be lower in the North group (P<0.01); and the most common types of TCM syndrome were excess syndrome (193, 56.6%) and primary deficiency and secondary excess syndrome (244, 86.2%) in the North and South groups, respectively (P<0.01). A regional difference does exist in the TCM syndromes of patients with CHD between North and South China, indicating that the prevention and treatment of CHD in South China should not only focus on promoting blood circulation and removing blood stasis, but also include supplementing qi and eliminating phlegm

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