Pervasive Miocene melting of thickened crust from the Lhasa terrane to Himalaya, southern Tibet and its constraint on generation of Himalayan leucogranite

Ji, Wei‐Qiang; Wu, Fu‐Yuan; Liu, Xiaochi; Liu, Zhichao; Zhang, Chang; Liu, Tong; Wang, Jiangang; Paterson, Scott R.

doi:10.1016/j.gca.2019.07.048

Cited by 56 publications

(59 citation statements)

References 63 publications

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“…(a) Primitive mantle‐normalized trace element patterns and (b) chondrite‐normalized REE patterns for the Ramba lamprophyre, comparing with the ultrapotassic rocks from the Lhasa Terrane (Ding et al., 2003; Gao et al., 2007; Guo & Wilson, 2019; Ji et al., 2020; Liu et al., 2014; Miller et al., 1999; Williams et al., 2001; Williams et al., 2004) and Indian metasediments and basement (the data are shown in attachments) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Plot of ε Nd ( t ) versus initial 87 Sr/ 86 Sr for the Ramba lamprophyre. Ultrapotassic rocks from the Lhasa Terrane (Ding et al., 2003; Gao et al., 2007; Guo and Wilson, 2019; Ji et al., 2020; Liu et al., 2014; Miller et al., 1999; Williams et al., 2001, 2004), middle Miocene granite porphyry (with high Sr/Y ratio) in the Tethyan Himalaya (Ji et al., 2020; King et al., 2007), ultramafic‐alkaline‐carbonate rocks from the northeastern India (Srivastava et al., 2005), lamprophyres from the eastern Dharwar craton of Indian plate (Chalapathi Rao et al., 2020; Talukdar et al., 2018) are shown for comparison [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Post‐collisional magmatism in the Himalaya is dominated by peraluminous leucogranites, which are generally thought to be induced by intracrustal heating and processes without contributions from the mantle (Harris & Massey, 1994; Searle et al., 2010). A few intrusions of calc‐alkaline affinity with high Sr/Y ratios were recently reported from the Tethyan Himalaya, yet their petrogenesis and tectonic setting are still controversial (Ji et al., 2020; King et al, 2007; Lin et al., 2020; Zeng et al., 2011). North of the IYSZ, post‐collisional magmatism in the Tibetan Plateau consists of potassic‐ultrapotassic volcanic rocks, adakitic intrusives and minor more felsic rocks, and most of them are spatially related to the N–S trending rifts (Chung et al, 2003; Guo et al., 2015; Hou et al., 2004; Liu et al., 2014; Williams et al., 2001; Williams et al., 2004; Zhao et al., 2009).…”

Section: Geological Background and Samplingmentioning

confidence: 99%

“…The deep processes responding to the orogenic uplift and a variety of other related geological phenomena are of great contention (Beaumont et al., 2004; England & Houseman, 1988; Harrison et al., 1992; Guo & Wilson, 2019; Li & Song, 2018; Molnar et al., 1993; Turner et al., 1996; Williams et al., 2001; Zhao & Morgan, 1985). Post‐collisional mantle‐derived magmatism is considered as a useful indicator for investigating the dynamics of the deep lithosphere (Prelevic et al., 2012), but all the previously identified mantle‐derived melts are restricted along and to the north of the Indus‐Yarlung Suture Zone (IYSZ) on the Asian side (Turner et al., 1996; Miller et al., 1999; Ding et al., 2003; Williams et al., 2004; Gao et al., 2007; Guo et al., 2015; Ji et al., 2020; Liu et al., 2014; Mahéo et al, 2009; Zhao et al., 2009). Due to the lack of mantle‐derived magmatic rocks south of the IYSZ, the architecture and thermal state of the deep‐seated lithosphere beneath the Himalayan orogen is poorly constrained.…”

Section: Introductionmentioning

confidence: 99%

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Middle Miocene ultrapotassic magmatism in the Himalaya: A response to mantle unrooting process beneath the orogen

et al. 2020

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Post‐collisional ultrapotassic magmatism received special attention because it is an important indicator for mantle geodynamics in a collisional orogen. So far, no mantle‐derived magmatism has been identified within the Himalayan belt, hindering our understanding of the architecture and thermal state of the deep‐seated lithosphere in this area during the orogenesis. Here, we report the first discovery of mantle‐derived ultrapotassic rock in the Himalayan region. The middle Miocene (ca. 13 Ma) lamprophyre dike intruded the Tethyan Himalaya sedimentary cover of the Ramba dome on the shoulder of the Yadong‐Gulu rift. Geochemical analyses suggest that the ultrapotassic melt was derived from the subcontinental lithospheric mantle of the Indian plate, within a relatively shallow depth in the spinel stability field. The ultrapotassic magmatism indicates asthenospheric upwelling in the middle Miocene, a response to the mantle unrooting process beneath the Himalayan orogen.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Geological Background and Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Middle Miocene ultrapotassic magmatism in the Himalaya: A response to mantle unrooting process beneath the orogen

et al. 2020

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“…White micas in the range 4-20 Ma can also be contributed from the Asian plate (Lhasa) or Burma/Indo-Burman sources, although the latter show a large majority of ages > 20 Ma ( [137] and references therein). Both the Asian and Burma plates show evidence for igneous sources as young as 10-15 Ma [139][140][141][142][143][144][145]; note the 50-70 Ma detrital zircon population of the Brahmaputra sourced by the Gangdese Batholith (GB) [42]. Prominent pre-Himalayan rutile sources to the Brahmaputra detritus (e.g.…”

Section: Modern U-pb Zircon-rutile Chronology Of Eastern Himalayan-timentioning

confidence: 99%

Coupled Zircon-Rutile U-Pb Chronology: LA ICP-MS Dating, Geological Significance and Applications to Sediment Provenance in the Eastern Himalayan-Indo-Burman Region

Bracciali

2019

Geosciences

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U-Pb dating by LA ICP-MS is one of the most popular and successful isotopic techniques available to the Earth Sciences to constrain timing and rates of geological processes thanks to its high spatial resolution, good precision (absolute U/Pb age resolution of ca. 2%, 2s), rapidity and relative affordability. The significant and continuous improvement of instrumentation and approaches has opened new fields of applications by extending the range of minerals that can be dated by this method. Following the development and distribution to the community of good quality reference materials in the last decade, rutile U-Pb thermochronology (with a precision only slightly worse than zircon) has become a commonly used method to track cooling of deep-seated rocks. Its sensitivity to mid- to low-crustal temperatures (~450 °C to 650 °C) is ideal to constrain exhumation in active and ancient orogens as well as thermal evolution of slow-cooled terranes. Recrystallization and secondary growth during metamorphism and the presence of grain boundary fluids can also affect the U-Pb isotopic system in rutile. A growing body of research focusing on U-Pb dating of rutile by LA ICP-MS is greatly improving our understanding of the behavior of this mineral with regards to retention of radiogenic Pb. This is key to fully exploit its potential as a tracker of geological processes. The latest developments in this field are reviewed in this contribution. The combined application of U-Pb zircon and rutile chronology in provenance studies, particularly when complemented by lower-T thermochronometry data, allows the isotopic characterization of the sources across a wide range of temperatures. The benefits of applying detrital zircon-rutile U-Pb chronology as a coupled provenance proxy are presented here, with a focus on the Eastern Himalayan-Indo-Burman region, where a growing number of successful studies employs such an approach to help constrain river drainage and basin evolution and to infer feedback relationships between erosion, tectonics and climate.

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Activity of the south Tibetan detachment system: Constraints from leucogranite ages in the eastern Himalayas

Zhang

Cao

et al. 2020

Geological Journal

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Himalayan leucogranites are widely distributed in the North Himalayan gneiss dome (NHGD) and at the top of the Greater Himalayan Crystalline Complex (GHC) and are generally controlled by detachment faults. The ages of these prekinematic, synkinematic, and postkinematic leucogranites can be used to limit the activity of detachment structures (such as the South Tibetan Detachment System, STDS). Research on the STDS activity time in the eastern Himalayas is relatively sparse. In this study, the zircon and monazite U–Th–Pb geochronology of synkinematic and postkinematic leucogranites, which are affected by the STDS and NHGD, in four areas (Lhozhag, Kuju, Xiaozhan, and Cuonadong) in Shannan City, Tibet, China, was measured. The results show that the oldest synkinematic two‐mica granite from Lhozhag, which is affected by the STDS, is 24–25 Ma, so the time of STDS activity is at or slightly earlier than 25 Ma. The youngest synkinematic leucogranite is the garnet‐bearing muscovite granite in Cuonadong at 18.4 Ma. The oldest undeformed postkinematic leucogranite (not affected by the STDS) is the muscovite granite in Xiaozhan at 17.4 Ma. Therefore, the end of STDS activity can be limited to 18.4–17.4 Ma. The STDS includes three forms: detachment fault in the NHGD (northern extension of the STDS), the inner STDS between the GHC and Tethyan Himalayan Sequence, and the outer STDS at the bottoms of synformal klippes. In this paper, the active time limits of the above three kinds of detachment zones are comprehensively summarized. Based on this work, the northward extension (ductile deformation) time of the STDS in the region is considered to be 28–17 Ma. The exhumation of the GHC is mainly controlled by in‐sequence shearing: first, the South Tibet Thrust system (predecessor of the STDS) at the top of the GHC thrust southward at 45–28 Ma, then the High Himalayan Discontinuity fault in the middle of the GHC forms south‐vergent ductile thrusts at 28–17 Ma, and finally, the Main Central Thrust at the bottom of the GHC thrust southward at 17–9 Ma.

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Pervasive Miocene melting of thickened crust from the Lhasa terrane to Himalaya, southern Tibet and its constraint on generation of Himalayan leucogranite

Cited by 56 publications

References 63 publications

Middle Miocene ultrapotassic magmatism in the Himalaya: A response to mantle unrooting process beneath the orogen

Middle Miocene ultrapotassic magmatism in the Himalaya: A response to mantle unrooting process beneath the orogen

Coupled Zircon-Rutile U-Pb Chronology: LA ICP-MS Dating, Geological Significance and Applications to Sediment Provenance in the Eastern Himalayan-Indo-Burman Region

Activity of the south Tibetan detachment system: Constraints from leucogranite ages in the eastern Himalayas

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