Evolution of North Himalayan gneiss domes: structural and metamorphic studies in Mabja Dome, southern Tibet

Lee, Jeffrey; Hacker, Bradley R.; Wang, Yu

doi:10.1016/j.jsg.2004.02.013

Cited by 180 publications

(245 citation statements)

References 60 publications

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“…Chen et al 1990;Lee et al 2000Lee et al , 2004Aoya et al 2005Aoya et al , 2006. These rocks preserve evidence for a north-south contractional deformation event upon which a vertical thinning and horizontal stretching deformational event was superimposed during moderate temperature/pressure metamorphism, and intrusion of leucogranites.…”

Section: Regional Setting Of the North Himalayan Gneiss Domesmentioning

confidence: 79%

“…The Mabja Dome preserves evidence for three major deformational events, two older penetrative subhorizontal contractional and subhorizontal stretching events, and a younger doming event (Lee et al 2004). D1, the oldest deformational event, is best exposed and dominant at the highest structural levels, exhibits bedding horizontally shortened into map-to mesoscopic scale, upright to inclined, open to tight, typically disharmonic F1 folds.…”

Section: Structural Historymentioning

confidence: 95%

“…The grade of metamorphism ranges from sillimanite zone at the base to unmetamorphosed at the top (Lee et al 2004). At the base of the section is a K-feldspar augen þ biotite þ plagioclase þ quartz + muscovite + sillimanite + garnet-bearing granitic migmatitic orthogneiss (og) that contains pockets and segregation banding of leucosomes and melanosomes suggesting partial melting.…”

Section: Rock Unitsmentioning

confidence: 99%

“…1). These domes expose middle crustal metasedimentary rocks and orthogneisses that preserve contractional structures overprinted by moderate temperature/pressure metamorphism, high strain structures developed during vertical thinning and horizontal stretching, partial melting, and emplacement of syn-and post-tectonic leucogranites Chen et al 1990; Lee et al 2000Lee et al , 2004Aoya et al 2005Aoya et al , 2006. While the structural, metamorphic and intrusive histories in these domes are well documented, their timing is not well known.…”

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confidence: 99%

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Oligocene-Miocene middle crustal flow in southern Tibet: geochronology of Mabja Dome

Lee

McClelland

Wang

et al. 2006

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New U -Pb zircon, monazite, 40 Ar/ 39 Ar, and apatite fission track ages provide constraints on the timing of formation and exhumation of the Mabja Dome, southern Tibet, shed light on how this gneiss dome formed, and provide important clues on the tectonic evolution of middle crustal rocks in southern Tibet. Zircons from a deformed leucocratic dyke swarm yield a U-Pb age of 23.1 + 0.8 Ma, providing the first age constraint on the timing of middle crustal ductile horizontal extension in the North Himalayan gneiss domes. Zircons and monazite from a post-tectonic two-mica granite yield ages of 14.2 + 0.2 Ma and 14.5 + 0.1, respectively, indicating that vertical thinning and subhorizontal stretching had ceased by the middle Miocene. Mica Ar chrontours are domed, whereas the low-temperature step potassium feldspar 40 Ar/ 39 Ar and apatite fission track chrontours are not, suggesting that doming occurred between 13.0 and 12.5 Ma and at temperatures between 370 and 2008C. Our new ages, along with field, structural and metamorphic data, indicate that the domal geometry observed at Mabja developed by middle-Miocene southward-directed thrust faulting upward and southward along a north-dipping ramp above cold Tethyan sediments. The structural, metamorphic and geochronologic histories documented at Mabja Dome are similar to those of Kangmar Dome, suggesting a common mode of occurrence of these events throughout southern Tibet. Vertical thinning and horizontal stretching, metamorphism, generation of migmatites, and emplacement of leucogranites in the domes of southern Tibet are synchronous with similar events in the Greater Himalayan Sequence that underlie the high Himalaya. These relations are consistent with previously proposed models for a ductile middle-crustal channel bounded above by the South Tibetan detachment system and below by the Main Central thrust in the High Himalaya that extended northward beneath southern Tibet.

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Section: Regional Setting Of the North Himalayan Gneiss Domesmentioning

confidence: 79%

Section: Structural Historymentioning

confidence: 95%

Section: Rock Unitsmentioning

confidence: 99%

mentioning

confidence: 99%

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Oligocene-Miocene middle crustal flow in southern Tibet: geochronology of Mabja Dome

Lee

McClelland

Wang

et al. 2006

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“…Coney, 1980;Armstrong et al, 1991), 히말라야(Himalaya; e.g. Lee et al, 2004;Horton et al, 2014), 알프스 (Alps; e.g. Axen et al, 1995), 아팔라치아(Appalachia:…”

mentioning

confidence: 99%

A Report on Gneiss Dome in the Hongseong Area, Southwestern Margin of the Gyeonggi Massif

Park¹,

Kim²

2016

Economic and Environmental Geology

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This study reports a gneiss dome in the Hongseong area, southwestern margin of the Gyeonggi massif. This gneiss dome, named here as 'Oseosan dome' because it is located around the Oseosan, the highest peak along the western coastal area, is composed mainly of the Neoproterozoic to Paleozoic ortho-and paragneiss, mafic metavolcanic rock, and metadolerite. Migmatization affected these rock units, in which leucocratic(granitic) materials derived from anatexis frequently occur as patch and vein parallel to or cutting through internal foliation. The Oseosan dome shows overall concentric geometry and outward-dipping internal foliation, but also partly complicatedly changeable or inward-dipping foliation. Taking available petrological and geochronological data into account, the Oseosan dome is interpreted to be exhumed quickly into the upper crustal level during the Late Triassic, accompanied in part with anatexis and granite intrusion. In addition, extensional shear zone intruded by the Late Triassic synkinematic granite and sedimentary basin have been reported around the Oseosan dome. These evidences possibly suggest that the Oseosan dome formed in closely associated with the Late Triassic extensional movement and diapiric flow. Alternatively, 1) thrust-or reverse fault-related doming or 2) interference between independent folds during structural inversion of the Late Traissic to Middle Jurassic sedimentary basin can be also considered as dome-forming process. However, considering the northern limb of the Oseosan dome, cutting by the Late Traissic granite, and the southern limb, cutting by contractional fault reactivated after the Middle Jurassic, it is likely that the domal structure formed during or prior to the Late Triassic.

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Midcrustal discontinuities and the assembly of the Himalayan midcrust

Larson

Cottle

2014

Tectonics

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Detailed quartz lattice preferred orientation (LPO) data define two structural discontinuities in the exhumed high-grade metamorphic core of the Himalaya exposed in the upper Tama Kosi region of east central Nepal. The structures are marked by abrupt breaks in a general trend of up structural section increasing quartz LPO-defined deformation temperatures. Deformation associated with the upper structural discontinuity, which occurs within sillimanite grade rocks, is postpeak metamorphism in both the hanging wall and the footwall. New geochronologic data constrain the timing of metamorphism in the hanging wall of the upper discontinuity to between 24 and 16 Ma, indistinguishable from previously published ages for the footwall. Movement across this structure represents Early Miocene strain localization and thickening in the Himalayan midcrust. Movement across the lower discontinuity, which occurs between staurolite and kyanite grade rocks, appears to be synmetamorphic with material in its footwall at approximately 10 Ma, but postpeak metamorphism for material in its hanging wall. This movement is interpreted to reflect the underplating and incorporation of material into the metamorphic core. The recognition of two thrust-sense discontinuities in the exhumed Himalayan core in the Tama Kosi region is consistent with other similar structures recognized along the Himalaya. The widespread nature of these structures reinforces that they are important to our understanding of the evolution of the kinematics of large, hot orogens.

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Evolution of North Himalayan gneiss domes: structural and metamorphic studies in Mabja Dome, southern Tibet

Cited by 180 publications

References 60 publications

Oligocene-Miocene middle crustal flow in southern Tibet: geochronology of Mabja Dome

Oligocene-Miocene middle crustal flow in southern Tibet: geochronology of Mabja Dome

A Report on Gneiss Dome in the Hongseong Area, Southwestern Margin of the Gyeonggi Massif

Midcrustal discontinuities and the assembly of the Himalayan midcrust

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