Unusually dumbbell-shaped Guposhan–Huashan twin granite plutons in Nanling Range of south China: Discussion on their incremental emplacement and growth mechanism

Feng, Zuohai; Wang, Chunzeng; Zhang, Minghua; Jin-cheng, Liang

doi:10.1016/j.jseaes.2011.12.022

Cited by 21 publications

(12 citation statements)

References 51 publications

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“…Jurassic strata, however, which mostly consist of sandstone in the study area, show only large-scale open folds, showing no evidence for penetrative deformation (i.e., high-temperature foliations or lineations; Shu et al, 2009) following the Triassic. Evidence for ductile or syn-emplacement deformation is equally devoid in Jurassic plutons in the SCB, including the Qitianling pluton and the spatially associated Huashan-Guposhan and Dadongshan plutons (Figure 1b;Feng et al, 2012;Shu, Wang, et al, 2011). The Jurassic plutons in SE China moreover show a random distribution ( Figure 1); that is, they are in no way spatially grouped (e.g., in linear intrusive belts).…”

Section: The South China Blockmentioning

confidence: 99%

Incremental Emplacement of the Late Jurassic Midcrustal, Lopolith‐Like Qitianling Pluton, South China, Revealed by AMS and Bouguer Gravity Data

et al. 2018

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Modes of magma emplacement may provide key information on geodynamic‐tectonic settings of magmatism, when the threshold of magma volume and duration of emplacement process is crossed, brittle/ductile crustal deformation behavior, and volumes and rates of magma transfer in the crust. The majority of upper‐crustal granitic intrusions are incrementally emplaced as laccoliths or sills, while midcrustal or deeper‐level granitic intrusions appear to be predominantly emplaced as sills or lopoliths, but relatively few examples have been studied. We present a case study on the Jurassic Qitianling pluton from South China, which was constructed in the upper part of the middle crust (at a depth of ~10–15 km). To characterize its emplacement mechanism and evolution, we have combined field and microscopic observations, Anisotropy of Magnetic Susceptibility measurements and Bouguer gravity anomaly modeling. The main findings are (1) the generally undeformed granite‐country rock contacts with a narrow thermal aureole, (2) irregularly wavy and gradational contacts between the main granite facies, (3) dominant subhorizontal magnetic fabrics in the granites with a scattered magnetic foliation, (4) rare occurrence of dykes, and (5) a subcircular surface and lopolith‐like pluton geometry. Accordingly, we suggest that the Qitianling pluton forms an ~25‐km wide and ~5‐km thick lopolith that was incrementally emplaced during a period of tectonic quiescence, most likely by under‐accretion of multiple magma sheets deflected from magma pulses that ascended through pipe‐like channels. The mineralogical and compositional variation of the pluton may be the result of in situ fractionation, fractionation at deeper crustal level, or variation in source‐derived melt compositions.

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Section: The South China Blockmentioning

confidence: 99%

Incremental Emplacement of the Late Jurassic Midcrustal, Lopolith‐Like Qitianling Pluton, South China, Revealed by AMS and Bouguer Gravity Data

et al. 2018

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“…Such a process is in agreement with the observation that most of the Jurassic plutons in the inland area (e.g., Nanling Range) display anorogenic features. Usually, no large-scale crustal deformation coeval with emplacement can be determined in the country rocks (Feng et al, 2012;H. S. Liu et al, 2016).…”

Section: Geodynamic Settingmentioning

confidence: 99%

“…Li, Qiu, & Yang, 2014;Zhou & Li, 2000;Zhou et al, 2006). In particular, determining the fabric patterns and shape at depth of plutons is crucial to address their emplacement modes, but only a few such work have been carried out in south China (Feng et al, 2012;Wei et al, 2016;Zhang et al, 2008). The lack of structural constraints makes difficult the assessment of the tectonic regimes (compression, extension, or strike slip) that are associated with the magmatism in the overriding continental plate.…”

Section: Introductionmentioning

confidence: 99%

“…Pluton emplacement processes contain significant information on the concomitant regional stress fields, since magma ascent and final emplacement are usually controlled by both internal dynamics and external tectonism (Bouchez, Hutton, & Stephens, 1997;Brown, 2013;Castro, 1987; Journal of Geophysical Research: Solid Earth 10.1002/2017JB014598 Hutton, 1988;Paterson et al, 1998). In particular, determining the fabric patterns and shape at depth of plutons is crucial to address their emplacement modes, but only a few such work have been carried out in south China (Feng et al, 2012;Wei et al, 2016;Zhang et al, 2008). The Dayunshan-Mufushan batholith that intruded into the Xuefengshan-Jiuling belt in the central SCB comprises Late Jurassic to Early Cretaceous granitic intrusions.…”

Section: Introductionmentioning

confidence: 99%

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Multiple Emplacement and Exhumation History of the Late Mesozoic Dayunshan‐Mufushan Batholith in Southeast China and Its Tectonic Significance: 2. Magnetic Fabrics and Gravity Survey

Chen

et al. 2018

JGR Solid Earth

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The Late Mesozoic magmatic province is a prominent feature of the South China Block (SCB). However, the tectonic regimes associated with the magmatism are still elusive. A combined anisotropy of magnetic susceptibility and gravity study has been carried out to determine the fabric patterns and shape at depth of the Dayunshan‐Mufushan composite batholith in the north‐central SCB. This is a companion paper to Part 1 that presented the structural and geochronological data of this batholith. The magnetic fabrics in the batholith interior predominantly reflect magma flow structures. Two distinct patterns of the magnetic lineations are defined, around NNE‐SSW and WNW‐ESE trends for the early‐stage and late‐stage intrusions of the batholith, respectively. The gravity survey reveals that the early‐stage intrusion has a main feeder zone located below its northern part, while several linear feeder zones trending NNE‐SSW are inferred for the late‐stage intrusion. Integrating all results, a two‐stage construction of the batholith with distinct tectonic regimes has been established. It is concluded that the early‐stage intrusion experienced a southward magma transport during its emplacement, partially assisted by far‐field compression from the north at ca. 150 Ma. Conversely, the emplacement and exhumation of the late‐stage intrusion was accommodated by a NW‐SE crustal stretching involving a lateral magma expansion above the multiple feeder zones (likely corresponding to extensional fractures) and ductile shearing during 132–95 Ma localized mainly along the Dayunshan detachment fault. Finally, we discuss the geodynamic linkage between the paleo‐Pacific subduction and the Late Mesozoic tectonomagmatism in the SCB.

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“…6B) that is outlined below. Subduction of the paleo-Pacific (Kula) Plate beneath SE China (Wang et al, 2013;Zhu et al, 2013) caused crustal deformation and large-scale crustal melting of fertile quartzo-feldspathic lithologies along the continental margin in the Mesozoic (Chen et al, 2003;Chen and Grapes, 2007;Wong et al, 2011;Li and Jiang, 2014;Ye et al, 2013;Feng et al, 2012;Li, 2000). With the development of a widespread Mesozoic granite magma layer at middle-upper crustal level, different types of structural basins were formed and as crustal temperatures increased, fold basins were formed in the Late-Triassic to Middle-Jurassic as a result of compressive deformation (Fig.…”

Section: Model For Origin Of Red Bedsmentioning

confidence: 99%

Thermal origin of continental red beds in SE China: An experiment study

Jiang

Chen

Grapes

et al. 2015

Journal of Asian Earth Sciences

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Unusually dumbbell-shaped Guposhan–Huashan twin granite plutons in Nanling Range of south China: Discussion on their incremental emplacement and growth mechanism

Cited by 21 publications

References 51 publications

Incremental Emplacement of the Late Jurassic Midcrustal, Lopolith‐Like Qitianling Pluton, South China, Revealed by AMS and Bouguer Gravity Data

Incremental Emplacement of the Late Jurassic Midcrustal, Lopolith‐Like Qitianling Pluton, South China, Revealed by AMS and Bouguer Gravity Data

Multiple Emplacement and Exhumation History of the Late Mesozoic Dayunshan‐Mufushan Batholith in Southeast China and Its Tectonic Significance: 2. Magnetic Fabrics and Gravity Survey

Thermal origin of continental red beds in SE China: An experiment study

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