Origin of middle Miocene leucogranites and rhyolites on the Tibetan Plateau: Constraints on the timing of crustal thickening and uplift of its northern boundary

Zhang, Liyun; Ding, Lin; Yang, Di; Xu, Qiang; Cai, Fulong; Liu, Deliang

doi:10.1007/s11434-011-4813-4

Cited by 16 publications

(7 citation statements)

References 61 publications

(144 reference statements)

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“…This motion lead to E-W extension along the northern margin of the Tibetan Plateau and the deeply rooted strike-slip faults were acting as pathways for the shoshonitic magmas (Jolivet et al, 2003), leucogranites and rhyolites (Zhang et al, 2012) Mountains, Meyer et al (1998) and Jolivet et al (2003) suggested that the strike-slip Kunlun Fault initated during the Early Neogene. Recently, after detailed geochemistry and geochronology studies on the Miocene leucogranites and rhyolites found in the Hoh Xil Lake area (north of the Kunlun Fault) (Fig.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Recently, after detailed geochemistry and geochronology studies on the Miocene leucogranites and rhyolites found in the Hoh Xil Lake area (north of the Kunlun Fault) (Fig. 1), Zhang et al (2012) suggested that the dehydration melting in this area was probably triggered by localized E -W stretching decompression within the left-lateral strike-slip Kunlun Fault system around 15 Ma. Meanwhile, Duvall et al (2013) and Yin (2010) In addition, from the data described above, the boundary between the SW Qaidam Basin and the Eastern Kunlun Mountains is characterized, since the Early Miocene by a series of northward migrating and eastward rotating left-lateral strike-slip faults rather than by a continuous northward thrusting (e.g.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Northward growth of the Qimen Tagh Range: A new model accounting for the Late Neogene strike-slip deformation of the SW Qaidam Basin

Cheng

Jolivet

Fu³

et al. 2014

Tectonophysics

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Northward growth of the Qimen Tagh Range: A new model accounting for the Late Neogene strike-slip deformation of the SW Qaidam Basin. Tectonophysics, Elsevier, 2014, 632, pp.32-47. 10.1016/j.tecto.2014 A C C E P T E D M A N U S C R I P T initially a left-lateral strike-slip fault system rather than a thrusting system. Growth strata indicate an Early Miocene onset age for this strike-slip deformation. However, earthquakes focal mechanisms show that the present-day tectonic pattern of this fault system is dominated by NE-SW transpression. As for the Qimen Tagh fault system, numerous linear geomorphic features and fault scarps indicate that it was again a strike-slip fault system. Deformed sediments within the Adatan Valley prove that strike-slip motion prevailed during the Pleistocene, yet the present day deformation is marked by NE-SW transpression. Collectively, the Kunbei and Qimen Tagh fault systems were initially left-lateral strike-slip fault systems that formed during Early Miocene and Pleistocene respectively. Colligating with these southward younging left-lateral strike-slip faulting ages and the fact that these convex-northward structures converge to the center segment of active Kunlun Fault in the east, we thus considered the Kunbei and Qimen Tagh fault systems as former western segments of the Kunlun Fault once located further south in the present-day location of that fault. These faults gradually migrated northward since the Early Miocene while their kinematics changed from left-lateral strike-slip motion to NE-SW transpression. ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Northward growth of the Qimen Tagh Range: A new model accounting for the Late Neogene strike-slip deformation of the SW Qaidam Basin

Cheng

Jolivet

Fu³

et al. 2014

Tectonophysics

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“…Previous studies have suggested that the initiation of surface uplift started in a variety of different epoches ranging from Eocene to Pliocene (45–4.5 Ma) [ Chung et al , ; Deng et al , ; Dupont‐Nivet et al , , ; Ge et al , ; Jiang and Li , ; Kent‐Corson et al , ; Rowley and Currie , ; C. Wang et al , ; Wang et al , ; Zheng et al , ]. Likewise, the estimated time for crustal thickening ranges from Eocene to Miocene (45–10 Ma) [ Chung et al , , , ; Guan et al , ; Z. Guo et al , ; Harris and Massey , ; Harrison et al , ; Hou et al , , ; Ji et al , ; Jiang and Li , ; Jiang et al , ; Le Fort et al , ; Ma et al , ; Tapponnier et al , ; Q. Wang et al , , ; Zhang et al , ]. Two main mechanisms have been proposed to account for crustal thickening and the surface uplift of the Tibetan Plateau: (i) continuous thickening and widespread viscous flow of the crust and mantle of the entire plateau, which assumes the entire lithosphere thickened as a thin viscous sheet, with broadly distributed shortening of both crust and mantle having absorbed plate convergence, i.e., a “soft Tibet model” [ England and Houseman , ; Molnar et al , ], and (ii) tectonic thickening, which proposes that plate convergence was consumed by time‐dependent, localized shear between coherent lithospheric blocks, i.e., a “rigid Tibet model” [ Jiang and Li , ; Jiang et al , ; Tapponnier et al , ; Yin and Harrison , ].…”

Section: Introductionmentioning

confidence: 99%

Eocene adakitic porphyries in the central‐northern Qiangtang Block, central Tibet: Partial melting of thickened lower crust and implications for initial surface uplifting of the plateau

Wang

Wyman

et al. 2017

JGR Solid Earth

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The time and mechanism of crustal thickening and initial surface uplift of the Tibetan Plateau remain highly controversial. Here we report on zircon U‐Pb age, and mineral, element, and Sr‐Nd isotope composition data for Eocene adakitic porphyries in the Laorite Co area of central‐northern Qiangtang Block, central Tibet. Laser ablation‐inductively coupled plasma‐mass spectrometry zircon U‐Pb age dating shows that the porphyries were generated at 42–41 Ma. All samples display adakitic geochemical characteristics, such as high SiO2 and Al2O3, and low Y and Yb contents, and high Sr/Y and La/Yb ratios with positive Sr and negligible Eu anomalies and Nb‐Ta depletion. They also have low magnesium number (Mg #) (16–45) and high K2O (4.0–4.6 wt %) values, as well as high (87Sr/86Sr)i (0.7076–0.7080) and low εNd(t) (−5.9 to −4.4) values. These adakitic rocks were most probably generated by partial melting of thickened lower crust in the stability field of garnet, amphibole, and rutile but with relatively minor plagioclase. Moreover, such a crustal thickening process beneath this block likely occurred no later than the middle Eocene and was most probably caused by the southward subduction of the Songpan‐Ganzi Block in the early Cenozoic. In addition, the occurrences of exposed adakitic porphyries unambiguously indicate that exhumation process occurred after their formation. Thus, these ~42 Ma adakitic porphyries indicate the occurrence of significant exhumation since 42 Ma. Integrated with the thermochronological and paleoelevation data, we suggest that the initial surface uplift of the Qiangtang Block, triggered by crustal thickening, was underway by the middle Eocene (~42 Ma).

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“…Leucogranites are closely related to intracontinental subduction orogenesis and are important for understanding the evolution mechanism, crustal thickening process, continental crustal anatexis, and geodynamic background of an orogen. Previous studies on leucogranites have mainly concentrated on the Himalayan Orogen (Wu, Liu, Liu, & Ji, ; Visonà, Carosi, Montomoli, Tiepolo, & Peruzzo, ; Hou et al, ; Liu, Wu, Ji, Wang, & Liu, ; Zhang et al, ; Guo & Wilson, ; Zhang et al, ; Aikman, Harrison, & Ding, ; Gao, Zeng, Liu, & Xie, ; Harrison, Grove, Lovera, & Catlos, ). However, there are only a few reports on the leucogranites in the Qinling Orogen (Deng, Zhao, Mo, Liu, & Luo, ; Guo & Li, ; Luo, ).…”

Section: Introductionmentioning

confidence: 99%

“…and geodynamic background of an orogen. Previous studies on leucogranites have mainly concentrated on the Himalayan Orogen (Wu, Liu, Liu, & Ji, 2015;Visonà, Carosi, Montomoli, Tiepolo, & Peruzzo, 2012;Hou et al, 2012;Liu, Wu, Ji, Wang, & Liu, 2014;Zhang et al, 2012;Guo & Wilson, 2012;Aikman, Harrison, & Ding, 2008;Gao, Zeng, Liu, & Xie, 2009;Harrison, Grove, Lovera, & Catlos, 1998). However, there are only a few reports on the leucogranites in the Qinling Orogen (Deng, Zhao, Mo, Liu, & Luo, 1995;Guo & Li, 2009;Luo, 2013).…”

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confidence: 99%

Geochemistry, geochronology, and petrogenesis of leucogranites in the Xiaogouli gold deposit in the West Qinling Orogen

Liu

Han

2017

Geological Journal

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Gold metallogenesis is closely related to orogeny. The Qinling–Dabie Orogen is the most important part of the Central China Orogen. The West Qinling Orogen was formed during the Indosinian period, the main period of amalgamation of the continent of China. The Xiaogouli gold deposit in the West Qinling Orogen has unique geological characteristics, with a unique albite–quartz‐vein ore type and mineralization correlate well with the granites. The granites have relatively low concentrations of Sr and Yb (Sr < 400 ppm and Yb < 2 ppm) but relatively high Al content, with average Na2O/K2O of 1.86, indicating that they are Na‐rich Himalayan type leucogranites. The minimum temperature of the initial magma was 804 °C; amphibolite‐facies hornfelsization occurred in the contact zone, and there was micrographic texture widely developed in the potassium feldspar, indicating an initial high‐temperature magma. The granites have low Mg# content (4.07–14.28) and are strongly enriched in light rare earth elements [(La/Yb)N = (101.57–355.49)], suggesting that they had experienced some fractional crystallization. The zircon SHRIMP U–Pb granite ages of 217.4 ± 1.5 Ma indicate that the granites were formed during the late stage of Indosinian magmatic activity in the area. The Xiaogouli leucogranites are believed to be products of partial melting of crust–mantle mixing rocks under the condition of high temperature, induced by asthenosphere upwelling during delamination and thinning of the lithosphere in the extensional environment in the late stage of orogenesis of the West Qinling Orogen. The magma formation depth was 30–50 km. Then, the magma experienced crystal differentiation, and the metallogenic materials and fluids were mainly from the crust–mantle magmas.

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Origin of middle Miocene leucogranites and rhyolites on the Tibetan Plateau: Constraints on the timing of crustal thickening and uplift of its northern boundary

Cited by 16 publications

References 61 publications

Northward growth of the Qimen Tagh Range: A new model accounting for the Late Neogene strike-slip deformation of the SW Qaidam Basin

Northward growth of the Qimen Tagh Range: A new model accounting for the Late Neogene strike-slip deformation of the SW Qaidam Basin

Eocene adakitic porphyries in the central‐northern Qiangtang Block, central Tibet: Partial melting of thickened lower crust and implications for initial surface uplifting of the plateau

Geochemistry, geochronology, and petrogenesis of leucogranites in the Xiaogouli gold deposit in the West Qinling Orogen

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