Twenty million years of continuous deformation along the Karakorum fault, western Tibet: A thermochronological analysis | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Twenty million years of continuous deformation along the Karakorum fault, western Tibet: A thermochronological analysis

Type de publication:

Journal Article

Source:

Tectonics, Volume 26, Ticket 4, p.26 (2007)

ISBN:

0278-7407

URL:

http://www.agu.org/

Mots-clés:

FELDSPARS; HIGH-TEMPERATURE; ARGON DIFFUSION

Résumé:

The role of the Karakorum fault zone (KFZ) is debated. South of 33 degrees N, ongoing dextral-oblique slip along the SW edge of the Gar basin exhumes metamorphic and magmatic rocks of the Ayilari range. Minerals have recorded a continuum of deformation from temperatures > 600-400 degrees C down to < 250 degrees C. The Ar-40/(39) Ar ages, the oldest being 21.2 +/- 1.0 Ma, yield minimum estimates for the initiation of the KFZ. These are in agreement with the U-Th/Pb ages constraining the onset of deformation at >= 25-22 Ma. Thermochronologic results show slow cooling for the period similar to 21-14 Ma, followed by rapid cooling between similar to 14 and 4 Ma. These data demonstrate that right-lateral motion was in progress in the early Miocene and that shear continued at least until 4 Ma, pointing to >= 20 Ma of deformation along the fault. Greenschist facies deformation superimposed upon the medium- to high-grade deformation marks a kinematic change from pure dextral to dextral-normal motion associated with the onset of rapid cooling. At the regional scale, the coexistence of transtension in the Gar basin with transpression documented along the Pangong range farther north suggests another example of the "zipper tectonics" model developed along the Red River fault. The kinematic shift induced the rise of the Ayilari range starting at 16-12 Ma and the incision of major river courses. The Indus River might have become captive of the relief at this time. The river's 120 km of apparent offset implies dextral motion at a long-term rate of >= 8.5 +/- 1.5 mm yr(-1).

Notes:

TectonicsISI Document Delivery No.: 190DUTimes Cited: 0Cited Reference Count: 98Cited References:*MIN GEOL USSR, 1989, GEOL MAP TADJ USSR RAMAUD N, 2003, J GEOPHYS RES, V108, P2053, DOI 10.1029/2001JB000904ARMIJO R, 1989, J GEOPHYS RES-SOLID, V94, P2787AVOUAC JP, 1993, GEOPHYS RES LETT, V20, P895BERGER GW, 1981, GEOCHIM COSMOCHIM AC, V45, P795BORGES FS, 1980, J STRUCT GEOL, V2, P273BROWN ET, 2002, J GEOPHYS RES-SOL EA, V107, ARTN 2192BRUNEL M, 1994, GEOLOGY, V22, P707BURG JP, 1983, THESIS U SCI MONTPELBURGESS R, 1992, EARTH PLANET SC LETT, V109, P147CHENG J, 1987, GEILOGIC MAP RITU RE, P598CHEVALIER ML, 2005, SCIENCE, V307, P411, DOI 10.1126/science.1105466CLEMENS JD, 2003, EARTH-SCI REV, V61, P1DALRYMPLE GB, 1974, GEOCHIMICA COSMOCHIM, V38, P715DAVIS AM, 2004, GEOL SOC SPEC PUBL, V226, P235DUNLAP WJ, 1998, J GEOL SOC LONDON 6, V155, P903EISBACHER GH, 1970, GEOL SOC AM BULL, V81, P2009FARLEY KA, 1996, GEOCHIM COSMOCHIM AC, V60, P4223FARLEY KA, 2000, J GEOPHYS RES-SOL EA, V105, P2903FARLEY KA, 2002, NOBLE GASES GEOCHEMI, V47, P819GALBRAITH RF, 1981, MATH GEOL, V13, P471GANSSER A, 1964, GEOLOGY HIMALAYASGAPAIS D, 1986, TECTONOPHYSICS, V125, P357GAPAIS D, 1989, GEOLOGY, V17, P1144GAPAIS D, 1989, MEM DOC CTR ARMORICA, V28, P1GARDIEN V, 1995, J GEOPHYS RES-SOL EA, V100, P15581GATES AE, 1989, J STRUCT GEOL, V11, P407GAUDEMER Y, 1989, ANN TECTONICAE, V3, P55GLEADOW AJW, 1986, CONTRIB MINERAL PETR, V94, P405GOWER JW, 1992, J STRUCT GEOL, V14, P301GREEN PF, 1981, NUCLEAR TRACKS, V5, P77GUILLOPE M, 1979, J GEOPHYS RES, V84, P5557HAMES WE, 1994, EARTH PLANET SC LETT, V124, P161HARRISON TM, 1985, GEOCHIM COSMOCHIM AC, V49, P2461HARRISON TM, 1991, GEOCHIM COSMOCHIM AC, V55, P1435HARRISON TM, 1994, EARTH PLANET SC LETT, V123, P95HARRISON TM, 1996, TECTONIC EVOLUTION A, P208HIRTH G, 1992, J STRUCT GEOL, V14, P145HOUSE MA, 2000, EARTH PLANET SC LETT, V183, P365HOUSE MA, 2001, AM J SCI, V301, P102HURFORD AJ, 1983, CHEM GEOL IG, V41, P285JENSEN LN, 1985, J STRUCT GEOL, V7, P527JI SC, 1990, J GEOL, V98, P65JIAO S, 1988, GEOLOGICAL MAP QINHAKAPP P, 2003, TECTONICS, V22, ARTN 1029KETCHAM RA, 1999, AM MINERAL, V84, P1235KIRSCHNER DL, 1996, GEOLOGY, V24, P747KRETZ R, 1983, AM MINERAL, V68, P227LACASSIN R, 2004, EARTH PLANET SC LETT, V219, P255, DOI10.1016/S0012-821X(04)00006-8LELOUP PH, 1995, TECTONOPHYSICS, V251, P3LELOUP PH, 1999, GEOPHYS J INT, V136, P19LELOUP PH, 2001, J GEOPHYS RES, V106, P6657LIU Q, 1993, PALEOCLIMATS CONTRAILOVERA OM, 1989, J GEOPHYS RES-SOLID, V94, P17917LOVERA OM, 1991, J GEOPHYS RES-SOLID, V96, P2057LOVERA OM, 1997, GEOCHIM COSMOCHIM AC, V61, P3171MAHEO G, 2004, SPEC PAP GEOL SOC AM, V380, P141MATTE P, 1996, EARTH PLANET SC LETT, V142, P311MILLER C, 2000, SCHWEIZ MINER PETROG, V80, P1MOLNAR P, 2004, GEOPHYS J INT, V158, P1134, DOI10.1111/j.1365-246X.2004.02312.xMURPHY MA, 2000, GEOLOGY, V28, P451MURPHY MA, 2002, GEOL SOC AM BULL, V114, P428OLESEN NO, 1987, TECTONOPHYSICS, V142, P291OLSEN TS, 1985, TECTONOPHYSICS, V111, P107PARRISH RR, 1989, GEOLOGY, V17, P1076PASSCHIER CW, 1982, THESIS U AMSTERDAM APASSCHIER CW, 1996, MICROTECTONICSPHILLIPS RJ, 2004, EARTH PLANET SC LETT, V226, P305, DOI10.1016/j.epsl.2004.07.037RATSCHBACHER L, 1994, J GEOPHYS RES-SOL EA, V99, P19917RENNE PR, 1998, CHEM GEOL, V145, P117RODDICK JC, 1978, EARTH PLANET SC LETT, V41, P233RODDICK JC, 1980, EARTH PLANET SC LETT, V48, P185ROLLAND Y, 2000, THESIS GRENOBLE U GRROLLAND Y, 2001, CR ACAD SCI II A, V332, P363ROLLAND Y, 2002, J VIRTUAL EXPLORER, V8, P185ROLLAND Y, 2007, IN PRESS J ASIAN EARSCHARER U, 1990, EARTH PLANET SC LETT, V97, P65SCHWAB M, 2004, TECTONICS, V23, ARTN TC4002SEARLE MP, 1992, T ROY SOC EDIN-EARTH, V83, P519SEARLE MP, 1996, TECTONICS, V15, P171SEARLE MP, 1998, GEOLOGICAL SOC LONDO, V135, P307SEYDOUXGUILLAUME AM, 2002, CHEM GEOL, V191, P165SIMPSON C, 1989, J METAMORPH GEOL, V7, P261SOBEL ER, 2003, BASIN RES, V15STESKY RM, 1974, TECTONOPHYSICS, V23, P177STESKY RM, 1978, CAN J EARTH SCI, V15, P361TAPPONNIER P, 2001, SCIENCE, V294, P1671TSURUMI J, 2003, J STRUCT GEOL, V25, P557TULLIS J, 1987, GEOLOGY, V15, P606TULLIS J, 1991, J STRUCT GEOL, V13, P987VALLI F, 2005, THESIS I PHYS GLOBEWEINBERG RF, 1998, J GEOL SOC LONDON 5, V155, P883WEINBERG RF, 2000, J GEOL, V108, P303WHITE JC, 1986, J STRUCT GEOL, V8, P133WHITE SH, 1975, CONTRIB MINERAL PETR, V50, P287YIN A, 1999, GEOL SOC AM BULL, V111, P1644YORK D, 1969, EARTH PLANET SC LETT, V5, P324ZHANG J, 2000, CHIN SCI B, V45