Triassic southeastward subduction of North China Block to South China Block: Insights from new geological, geophysical and geochemical data

Li, Sanzhong; Jahn, Bor‐ming; Zhao, Shilin; Dai, Liming; Li, Xiyao; Suo, Yanhui; Guo, Lingli; Wang, Yongming; Liu, Xiaochun; Lan, Haoyuan; Zhou, Zongtao; Zheng, Qiliang; Wang, Pengcheng

doi:10.1016/j.earscirev.2017.01.009

Cited by 234 publications

(168 citation statements)

References 98 publications

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“…During the Mesozoic, the NCC experienced polycyclic subduction and collision events. To the south, a two‐phase collision between the South China Craton and the NCC along the Shangdan suture and the Mianlue suture (Figure a) closed the Proto‐Tethys Ocean and formed the Qinling‐Dabie Orogenic belt (Figure a) during the late Carboniferous‐Middle Triassic (Dong et al, ; Li et al, ; Liu, Su, et al, ; Zhang et al, ). The northern margin of the NCC underwent continuous southward subduction of the Paleo‐Asian Ocean lithosphere and multiphase microblock and magmatic arc amalgamation, which subsequently formed the broad Central Asia Orogenic Belt until the closure of the Paleo‐Asia Ocean and formation of the Solonker suture zone by the end of the late Paleozoic (Eizenhofer et al, ; Eizenhöfer & Zhao, ; Liu, Su, et al, ; Meng, ; Zorin, ).…”

Section: Regional Tectonicsmentioning

confidence: 99%

“…However, conflicting basin structural configurations, contrasting patterns of sediment accumulation, and inadequate stratigraphic age controls in the intermontane basins of the Yanshan belt have led to considerable debate regarding the nature of the regional structure and the fold‐thrust belt evolution. In particular, some authors insist that extensional and thermal subsidence associated with lithospheric thinning of the NCC controlled the formation and development of the basins in the Late Jurassic‐Early Cretaceous period (Qi et al, ; Qu et al, ; Shao et al, ), while others argue that the overall structural setting was compressional in nature during the deposition of the Upper Jurassic‐Lower Cretaceous (J 3 ‐K 1 ) succession (He et al, ; Cope et al, ; Liu et al, ; Liu, Su, et al, ; Liu et al, ; Liu et al, ; Li et al, ). Regardless, this nonmarine succession should record the activities of regional structures and may document the tectonic transition of the Yanshan belt.…”

Section: Introductionmentioning

confidence: 99%

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Late Jurassic‐Early Cretaceous Deformation in the Western Yanshan Fold‐Thrust Belt: Insights From Syntectonic Sedimentation in the Chicheng Basin, North China

et al. 2019

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The Yanshan fold‐thrust belt is a significant intraplate deformation belt along the northern margin of North China Craton and records multiple phases of deformation during the Mesozoic. However, the specific tectonic evolution of the Yanshan belt during the Mesozoic has long been debated. In particular, many arguments exit regarding whether a contractional or extensional context dominated the Yanshan belt in the Late Jurassic‐Early Cretaceous. One reason for this argument is the poor understanding of the tectono‐sedimentary relationship preserved in the sedimentary records. A lack of evidence of syntectonic sediments makes it more difficult to reconstruct this relationship. The Chicheng basin in the western Yanshan belt contains complete Upper Jurassic‐Lower Cretaceous succession and is bounded by marginal faults. New regional geological mapping, detailed sedimentary facies analysis, and recognition of two growth strata packages help reconstruct the tectono‐sedimentary relationship in the Chicheng basin. Additionally, zircon U‐Pb dating provides constraints on the timing of the deformation. Our results suggest that the dynamic sediment dispersal system in the Chicheng basin during the Late Jurassic‐Early Cretaceous were controlled by two phases of thrusting, including the activities of the Shangyi‐Pingquan fault during 162–147 Ma, and the Fengning‐Longhua fault during 140–135 Ma. Therefore, we propose that the western Yanshan belt was in a contractional context during the Late Jurassic‐Early Cretaceous. Our findings indicate that the tectonic setting of the Yanshan belt experienced a prominent transition from E‐W trending structures to NE‐SW trending structures and that this transition was probably related to subduction of the Paleo‐Pacific plate beneath the East Asian continent.

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Section: Regional Tectonicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Late Jurassic‐Early Cretaceous Deformation in the Western Yanshan Fold‐Thrust Belt: Insights From Syntectonic Sedimentation in the Chicheng Basin, North China

et al. 2019

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“…The CAOB, also known as the Altaid Tectonic Collage (Jahn, 2004; Sengör, 1993), extends from the Urals in the west, through Kazakhstan, northern China, Mongolia, and southern Siberia to the Okhotsk Sea along the eastern Russian coast (Figure a; Sengör, 1993). It is located between the Siberian Craton to the north and the North China and Tarim cratons to the south (Figure a; Li et al, ; Li et al, ; Li et al, ; Li et al, ; Li et al, ). The CAEJ orogenic college lies in north‐eastern Xinjinag and can be divided into three juxtaposed tectonic units referred to as the Chinese Altay, the Erqis shear zone, and the East Junggar from north to south, respectively (Figure b).…”

Section: Geological Settingmentioning

confidence: 99%

Metasomatic alteration of volcanic‐sedimentary terrane in the Early Devonian: Implication for the formation of the Mengxi porphyry copper deposit, eastern Junggar, Central Asian Orogenic Belt

Zhang

Wang²,

Wang³

et al. 2017

Geological Journal

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The Mengxi porphyry copper deposit, situated in the eastern Junggar, Central Asian Orogenic Belt, is not a typical porphyry copper deposit, and the origin of the deposit has been a topical debate for a decade. The ore bodies of the Mengxi porphyry copper deposit mainly developed in the volcanic‐sedimentary terrane (Huangcaopo Group) near a granite porphyry, with strong wall‐rock alteration as well as vertical zonation and fracture‐related vein fillings. The result of zircon U–Pb dating indicates that the granite porphyry was emplaced at 432.6 ± 6.7 Ma. The granite porphyry has relatively low initial 87Sr/86Sr ratios (0.70465–0.70537), high whole‐rock ƐNd(t) values (−2.2 to 6.6), and similar geochemical affinities of adakites and Andean island arc volcanic rocks, indicating that the Mengxi granite porphyry was derived from the partial melting of the upper mantle modified by slab‐derived fluids, with negligible assimilation of crust. Pyrites from the porphyry and volcanic‐sedimentary terrane have a similar δ34S and Pb isotopic compositions, indicating that different pyrites may have similar source. Based on the detailed field investigation, observed mineral assemblages, and crosscutting relationships, massive fine anhedral chalcopyrite and bornite disseminated in the Huangcaopo Formation, chalcopyrite as inclusion in pyrite veins in the contact zone, and the amount of Cu‐bearing minerals increased from terrane to veins have been recognized. All these observations reveal that the ore‐forming materials of the Mengxi copper deposit were mainly derived from the metasomatic alteration of the Huangcaopo Group triggered by the extensive Early Devonian tectonic‐magmatic events.

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“…The geologic framework of the Qinling orogenic belt was built up through interplay of three blocks, the North China Block (including the North Qinling), the South Qinling Block, and the South China Block, separated by the Shangdan and Mian‐Lue sutures (Dong et al, ; Li et al, ; Li Jahn et al, ; Li, Zhao et al, ; Liu, Wei, Li, Dong, & Liu, ; Meng, Wang, & Hu, ; Meng & Zhang, ; Zhang, Zhang, Yan, & Wang, ; Zhang et al, ). The Shangdan suture resulted from the Middle Paleozoic closure of the Shangdan Ocean and the collision of the North China Block and the South Qinling Block.…”

Section: Geological Settingmentioning

confidence: 99%

The genesis of the Xujiagou copper deposit, Mian‐Lue‐Ning area of Shaanxi Province,NWChina: Constraints from mineral chemistry and in situPbisotope composition

et al. 2017

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The Mian‐Lue‐Ning area, bounded by the Hanjiang fault zone in the south and the Mian‐Lue suture in the north, is one of the most important polymetallic mineralization concentration regions in the Qinling orogenic belt. The Xujiagou copper deposit is representative in this area with chalcopyrite and pyrrhotite as the main ore minerals, subordinate sphalerite, and pyrite. However, the source of the ore‐forming materials and the genesis of the Xujiagou copper deposit are still in a controversy due to the lack of detailed study on the mineral composition. In this study, the electron probe micro‐analyzer (EPMA) analysis shows that the pyrrhotite in the Xujiagou copper deposit is mostly monoclinic pyrrhotite of low‐temperature phase, indicating that the metallogenic temperature should be below 304 °C. The percent of FeS molecules in sphalerite is 8.16–12.1%, indicating that the metallogenic temperature is 230–258 °C, which is mesothermal mineralization. The in situ Pb isotope composition of chalcopyrite (206Pb/204Pb = 19.087–20.861; 207Pb/204Pb = 15.533–16.062; 208Pb/204Pb = 38.121–39.391) and pyrrhotite (206Pb/204Pb = 20.241–20.664; 207Pb/204Pb = 15.7–15.996; 208Pb/204Pb = 38.659–39.372) in the Xujiagou copper deposit was analysed by fLA‐MC‐ICPMS, and it indicates that the ore‐forming materials were mainly sourced from the upper crust. Moreover, the contents and ratios of Co and Ni in pyrrhotite (Ni: 500–1600 ppm, Co < 630 ppm, Co/Ni = 0.03–1.71) suggest that the ore‐forming material of the Xujiagou copper deposit could be extracted from the spilite of the Guojiagou Formation, and the ore minerals inherited the geochemical characteristics of the spilite. Combined with previous studies of the Tongchang copper deposit in the Mian‐Lue‐Ning area, it is proposed that the Xujiagou and Tongchang copper deposits have similar ore‐forming materials source and evolution processes, and their formations may be related to the breakup event of the Rodinia supercontinent. However, the relatively lower 207Pb/204Pb and 206Pb/204Pb ratios of the Tongchang chalcopyrite and pyrite than those of the Xujiagou chalcopyrite and pyrrhotite indicate that the Tongchang copper deposit suffered more intense influence of the lower crust materials due to the emplacement of the Tongchang diorite.

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Triassic southeastward subduction of North China Block to South China Block: Insights from new geological, geophysical and geochemical data

Cited by 234 publications

References 98 publications

Late Jurassic‐Early Cretaceous Deformation in the Western Yanshan Fold‐Thrust Belt: Insights From Syntectonic Sedimentation in the Chicheng Basin, North China

Late Jurassic‐Early Cretaceous Deformation in the Western Yanshan Fold‐Thrust Belt: Insights From Syntectonic Sedimentation in the Chicheng Basin, North China

Metasomatic alteration of volcanic‐sedimentary terrane in the Early Devonian: Implication for the formation of the Mengxi porphyry copper deposit, eastern Junggar, Central Asian Orogenic Belt

The genesis of the Xujiagou copper deposit, Mian‐Lue‐Ning area of Shaanxi Province,NWChina: Constraints from mineral chemistry and in situPbisotope composition

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