New paleontological evidence on time determination of the east part of the Eastern Kunlun Mélange and its tectonic significance

Zhang, Kexin; Lin, Qixiang; Zhu, Y.; Yin, Handong; Mansheng, Luo; Chen, Nengsong; Wang, Guocan

doi:10.1360/03yd0231

Cited by 18 publications

(9 citation statements)

References 4 publications

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“…Chen et al [15] determined a whole-rock 40 Ar/ 39 Ar plateau age of 345.3 ± 7.9 Ma from basalts in the Dur'ngoi ophiolites. Later, Zhang et al [16] reported the discovery of early Permian siliceous radiolarian in the Buqingshan ophiolite mélange. Yang et al obtained a zircon SHRIMP age of 308.2 ± 4.9 Ma from basaltic lava in the Dur'ngoi ophiolites [13] .…”

Section: Regional Geologymentioning

confidence: 99%

Geochemistry and spatial distribution of OIB and MORB in A’nyemaqen ophiolite zone: Evidence of Majixueshan ancient ridge-centered hotspot

et al. 2007

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The mafic volcanic association is made up of OIB, E-MORB and N-MORB in the A'nyemaqen Paleozoicophiolites. Compared with the same type rocks in the world, the mafic rocks generally display lower Nb/U and Ce/Pb ratios and some have Nb depletion and Pb enrichment. The OIB are LREE-enriched with (La/Yb) N =5-20, N-MORB are LREE-depleted with (La/Yb) N = 0.41-0.5. The OIB are featured by incompatible element enrichment and the N-MORB are obviously depleted with some metasomatic effect, and E-MORB are geochemically intermediated. These rocks are distributed around the Majixueshan OIB and gabbros in a thickness greater than a thousand meters and transitionally change along the ophiolite extension in a west-east direction, showing a symmetric distribution pattern as centered by the Majixueshan OIB, that is, from N-MORB, OIB and E-MORB association in the Dur'ngoi area to OIB in the Majixueshan area and then to N-MORB, OIB and E-MORB assemblage again in the Buqingshan area. By consideration of the rock association, the rock spatial distribution and the thickness of the mafic rocks in the Majixueshan, coupled with the metasomatic relationship between the OIB and MORB sources, it can be argued that the Majixueshan probably corresponds to an ancient hotspot or an ocean island formed by mantle plume on the A'nyemaqeh ocean ridge, that is the ridge-centered hotspot, tectonically similar to the present-day Iceland hotspot.A'nyemaqen ophiolite zone, OIB, N-MORB and E-MORB association, spatial distribution, Majixueshan ridge-centered hotspot, metasomatism, mantle plume Coexistence of normal mid-ocean-ridge basalts (N-MORB), enriched mid-ocean-ridge basalts (E-MORB) and ocean island basalts (OIB) in the certain tectonic setting has drawn extensive attention and strong interest. Iceland in the North Atlantic Ocean has become a well-known example for the phenomenon. The phenomenon has been thought to be a result of superposition of a hotspot on a ridge (ridge-centered hotspot) [1] or an oceanic island on a ridge (ridge-centered island) [2] or a mantle plume on a ridge (plume on-ridge) [3] , and hotspot-ridge interaction or plume-ridge interaction [4,5] . The spatial superposition and materials interaction between a ridge and a hotspot or an ocean island or a plume cause anomalies of geochemistry, topography, crustal structure, gravity, seismic velocity and bathymetry in the area surrounding a ridge-hotspot [1] .Recent studies have indicated that the coexistence not only occurs in a modern environment like Iceland, but also can be traced into ophiolite zones representing preserved oceanic crust in continental orogenic belts. Hou et al. [6,7] , according to the coexistence of OIB, N-MORB and T-MORB and their specific configuration in space, proposed a paleo-Tethyan mantle plume model to inter-

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Section: Regional Geologymentioning

confidence: 99%

Geochemistry and spatial distribution of OIB and MORB in A’nyemaqen ophiolite zone: Evidence of Majixueshan ancient ridge-centered hotspot

et al. 2007

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“…Chen et al [9] determined a whole-rock 40 Ar/ 39 Ar plateau age of 345.3 ± 7.9 Ma from basalts in the Dur'ngoi ophiolites. Zhang et al [10] reported the discovery of early Permian siliceous radiolarian in the Buqingshan ophiolite mélange. Yang et al [7] obtained a zircon SHRIMP age of 308.2 ± 4.9 Ma from basaltic lava in the Dur'ngoi ophiolites.…”

Section: A'nyêmaqên Ophiolite Zonementioning

confidence: 99%

Geochemistry and spatial distribution of late-Paleozoic mafic volcanic rocks in the surrounding areas of the Gonghe Basin: Implications for Majixueshan triple-junction and east Paleotethyan archipelagic ocean

Guo

Zhang

Sun

et al. 2007

Sci. China Ser. D-Earth Sci.

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The late-Paleozoic mafic volcanic rocks occurring in the surrounding areas of the Gonghe basin are distributed in the A'nyêmaqên ophiolite zone, Zongwulong tectonic zone and Kuhai-Saishitang volcanic zone. The mafic volcanics in the A'nyêmaqên zone formed an ancient ridge-centered hotspot around the Majixueshan OIB, the Kuhai-Saishitang mafic rocks consist of E-MORB and continental rift basalts and the Zongwulong volcanic rocks are enriched N-MORB. The regionally low Nb/U and Ce/Pb ratios reflect the influence of the OIB material on the mafic magma source. From geochemistry, spatial distribution and tectonic relationship of the mafic rocks, an ancient triple-junction centered at the Majixueshan can be inferred. The existence of the Kuhai-Saishitang aulacogen may have provided a tectonic channel for the Majixueshan OIB materials metasomatizing the magma source for the Zongwulong rocks. The formation of the triple-junction and the rifting of the Zongwulong zone have separated the orogens and massifs in the region.

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“…The two northern elements are divided by the North East Kunlun Fault, whereas the Central East Kunlun and South East Kunlun sectors are separated by the Central East Kunlun fault (Jiang et al, 1992;Meng et al, 2013;Xia et al, 2014). There is a growing consensus that the EKOB has documented a complicated history of seafloor spreading, subduction, and terrane amalgamation between Gondwanaland and Laurasia since the Early Paleozoic (Jiang et al, 1992;Yang et al, 1996;Yin and Harrison, 2000;Zhang et al, 2004;Chen et al, 2008;Xiong et al, 2014). The Buqingshan-A'nyemaqen suture zone is divided from the Southern Zone by the South Kunlun Fault and linked to the Hohxil-Songpan-Ganzi Basin to the south .…”

Section: Geological Background and Petrographymentioning

confidence: 99%

Petrogenesis and geodynamic implications of the Mid-Triassic lavas from East Kunlun, northern Tibetan Plateau

Huang

Luo

et al. 2015

Journal of Asian Earth Sciences

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New paleontological evidence on time determination of the east part of the Eastern Kunlun Mélange and its tectonic significance

Cited by 18 publications

References 4 publications

Geochemistry and spatial distribution of OIB and MORB in A’nyemaqen ophiolite zone: Evidence of Majixueshan ancient ridge-centered hotspot

Geochemistry and spatial distribution of OIB and MORB in A’nyemaqen ophiolite zone: Evidence of Majixueshan ancient ridge-centered hotspot

Geochemistry and spatial distribution of late-Paleozoic mafic volcanic rocks in the surrounding areas of the Gonghe Basin: Implications for Majixueshan triple-junction and east Paleotethyan archipelagic ocean

Petrogenesis and geodynamic implications of the Mid-Triassic lavas from East Kunlun, northern Tibetan Plateau

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