Early Paleozoic intrusive rocks from the eastern Qilian orogen, NE Tibetan Plateau: Petrogenesis and tectonic significance

Yang, He; Zhang, Hongfei; Luo, Biji; Zhang, Jie; Xiong, Ziliang; Guo, Liang; Pan, Fa-Bin

doi:10.1016/j.lithos.2015.02.020

Cited by 78 publications

(73 citation statements)

References 94 publications

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“…It is noteworthy that previous wide-angle seismic studies and receiver function studies (Ye et al, 2015) also detected lateral variation in velocity structure on both sides of the Maxian Shan fault zone. Previous geochemical and petrologic studies (Xiao et al, 2009;Yang et al, 2015) further support the interpretation that the Maxian Shan fault zone represents a tectonic boundary that separates the Japan-type central Qilian arc to the south from the Mariana-type North Qilian arc to the north (Xiao et al, 2009) (Fig. 3b).…”

Section: Long Deep Seismic Reflection Datasupporting

confidence: 61%

“…The Qilian Shan represents a patchwork of units and structures amalgamated through subduction-related processes and a subsequent suturing of a Mariana-type intra-oceanic arc (North Qilian) and a Japan-type arc (Central Qilian) (Xiao et al, 2009). Evidence of this amalgamation process consists of island arc assemblages, accretionary prisms, ophiolites and high to ultrahighpressure metamorphic rocks exposed at the surface (Xiao et al, 2009;Yang et al, 2015). With the exception of occasional exposures of Baiyin arc and Lanzhou arc plutons, as well as the Longshan complex in the southeastern corner of NE Tibet (Fig.…”

Section: Tectonic Settingsmentioning

confidence: 99%

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Lithospheric architecture and deformation of NE Tibet: New insights on the interplay of regional tectonic processes

Guo

Gao

et al. 2016

Earth and Planetary Science Letters

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Editor: P. ShearerKeywords: deep seismic reflection image residual gravity NE Tibet lithospheric architecture deformation pattern GPS measurements indicate rapid lateral extrusion of the NE Tibetan Plateau, which causes active NEdirected crustal shortening and has initiated oblique shearing along the margins of NE Tibet. However, the Tibetan highlands terminate around 103 • E longitude and topographic relief disappears to the northeast. The exact reasons for this drop in elevation remain obscure due to widespread Tertiary sediments and Quaternary loess, which obscure details of the lithospheric structure. This study describes a new 310 kmlong deep seismic reflection line striking NE-SW across the interior of NE Tibet. Integrating its data with a previously described 165 km-long deep seismic profile of the Tibet-Ordos transition zone together, these datasets provide a complete picture of the crustal architecture of the north-easternmost Tibetan Plateau. Gravity anomaly and previous geological evidence also help constrain complex deformation pattern in the region. Interpretations of these patterns indicate the importance of the large-scale sinistral Haiyuan fault zone and inherited vertical variation in mechanical properties of the lithosphere in the overall tectonic evolution of the NE Tibetan Plateau. The overall crustal architecture obtained in this study provides spatial context for the neotectonic evolution of NE Tibet and helps constrain the interplay of geologic and geodynamic processes affecting NE Tibet and adjacent regions.

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Section: Long Deep Seismic Reflection Datasupporting

confidence: 61%

Section: Tectonic Settingsmentioning

confidence: 99%

Lithospheric architecture and deformation of NE Tibet: New insights on the interplay of regional tectonic processes

Guo

Gao

et al. 2016

Earth and Planetary Science Letters

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“…However, the majority of previous research in this area has focused on igneous rocks on the North Qilian Belt (Song et al, ; Wang et al, ; Wu et al, ), the ophiolites on the South Qilian Belt (Fu et al, ; Fu et al, ; Fu et al, ), and the Hualong Complex (Wang et al, ; Yan et al, ). The intrusives in South Qilian Belt is limited (Yang et al, ; Yong & Yuanc, ). However, the petrogenesis of igneous and the early Palaeozoic tectonic evolution of the South Qilian region remain controversial.…”

Section: Introductionmentioning

confidence: 99%

Geochronology and geochemistry of early Palaeozoic intrusive rocks in the Lajishan area of the eastern south Qilian Belt, Tibetan Plateau: Implications for the tectonic evolution of South Qilian

et al. 2018

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The Lajishan area, located in the South Qilian orogenic Belt, north‐eastern Tibetan Plateau, contains a compositionally diverse range of Cambrian to early Ordovician felsic intrusions that reflect the early Palaeozoic tectonic evolution of the Central Qilian Belt. This paper presents new geochemical, Sr─Nd and Lu─Hf isotopic, and zircon U─Pb data for the Tadong, Huangcaoshan, and Yindonggou plutons in the eastern Lajishan area. LA‐ICPMS U─Pb ages of 517.4 ± 1 Ma for the Tadong pluton which is the first find Late Cambrian granitoids in this area, 467 ± 1 Ma for the Huangcaoshan pluton and 446 ± 1 Ma for the Yindonggou pluton. The new data indicate that the Tadong pluton and Huangcaoshan pluton belong to I‐type granite. Their A/CNK values range from 0.82 to 1.03, suggesting a close relationship with I‐type granitoids. Their trace‐element geochemical characteristics include enrichments in the LILEs, pronounced depletions in Nb and Ta, enrichment of the LREEs relative to the HREEs, and Eu anomalies. These features are similar to those of I‐type volcanic‐arc magmas. Combined with Hf and Sr─Nd isotopic data, The Tadong pluton generated by the mixing of melts was derived from the partial melting of the Precambrian basement and mantle‐derived magmas. The Huangcaoshan pluton was derived from juvenile crust with contamination. The Yindonggou pluton shows A‐type characteristics, their A/NCK is 0.88–1.07, and 10000 × Ga/Al is higher than 2.6. They were characteristic with high Sr, low Y, low Yb, and enriched LREE. Combined with Hf and Sr─Nd isotopic data, the Yindonggou pluton was generated by the partial melting of oceanic slab material and was crustally contaminated associated with slab breakoff. Combined previous research suggests that Tadong pluton and Huangcaoshan pluton formed from southern subduction of the South Qilian ocean into the Central Qilian Belt; the Yindonggou pluton formed in collisional setting.

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“…The Qilian Orogenic Belt (QOB), located at the north‐eastern margin of the Qinghai–Tibet Plateau (Figure a), is key to understanding the tectonic evolution of the Central China Orogenic Belt. The QOB (Figure ) records a long history of continental break‐up, seafloor spreading, and final continental collision from the Neoproterozoic to the Palaeozoic (Li, Jahn, et al, ; Li, Zhao, et al, ; Song, Niu, Su, & Xia, ; Song, Niu, Su, Zhang, & Zhang, ; Song, Niu, Zhang, & Zhang, ; Tung et al, ; Wang et al, ; Xiao et al, ; Yang et al, ; Yu et al, ). Based on tectonics (Song et al, ; Song et al, ; Song et al, ), the QOB is divided into the following: (1) North Qilian Orogenic Belt (NQOB), (2) Qilian Block (QB), and (3) North Qaidam Ultrahigh‐Pressure Metamorphic Belt (NQ‐UHPMB; Figure b).…”

Section: Introductionmentioning

confidence: 99%

Geochronology and petrogenesis of Neoproterozoic S‐type granites from the Qilian Block, north‐west China, and their geological implications

Liu

Ren

et al. 2018

Geological Journal

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Early Neoproterozoic granites rarely outcrop in the Qilian Orogenic Belt (QOB) at the north‐eastern margin of the Qinghai–Tibet Plateau; however, they are vital to understanding the Precambrian evolution of the QOB. Thus, we present an integrated study, comprising petrology, geochronology, and whole‐rock geochemistry of two Early Neoproterozoic granitic plutons (Baihuagou and Yamacha plutons) in the eastern Qilian Block (QB). The results provide three key findings. First, their magma emplacement age is ca. 900 Ma (i.e., 918 Ma for Baihuagou and 910 Ma for Yamacha), and the two plutons have similar high‐K calc‐alkaline, strongly peraluminous characteristics, with slight enrichment in light rare earth elements; weak negative Eu anomalies; enrichment in large‐ion lithophile elements (e.g., K, Th, Ba, and Rb); strong depletion in Ti; and weak depletion in Nb, Ta, and, Sr. These characteristics indicate that the granites from these plutons are S‐type granites. Second, the two‐mica granite and gneissic granite samples may have been formed by partial melting of ancient crustal material (mainly psammitic rocks), with contributions from a meta‐igneous component, under high‐temperature and low‐pressure conditions. Third, new data from this study, combined with previously reported dates, indicate a continental margin arc setting for the QB during the Early Neoproterozoic (ca. 900 Ma).

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Early Paleozoic intrusive rocks from the eastern Qilian orogen, NE Tibetan Plateau: Petrogenesis and tectonic significance

Cited by 78 publications

References 94 publications

Lithospheric architecture and deformation of NE Tibet: New insights on the interplay of regional tectonic processes

Lithospheric architecture and deformation of NE Tibet: New insights on the interplay of regional tectonic processes

Geochronology and geochemistry of early Palaeozoic intrusive rocks in the Lajishan area of the eastern south Qilian Belt, Tibetan Plateau: Implications for the tectonic evolution of South Qilian

Geochronology and petrogenesis of Neoproterozoic S‐type granites from the Qilian Block, north‐west China, and their geological implications

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