High-temperature metamorphism in a major strike-slip shear zone: the Ailao Shan—Red River, People's Republic of China

Leloup, Philippe‐Hervé; Kiénast, Jean-Robert

doi:10.1016/0012-821x(93)90169-a

Cited by 191 publications

(119 citation statements)

References 28 publications

Supporting

Mentioning

109

Contrasting

Unclassified

Order By: Relevance

“…Leloup & Kienast 1993;Lacassin et al 2004a,b;Valli et al 2007Valli et al , 2008Rolland et al 2008). A simple test of this theory would be that U-Pb monazite ages for peak metamorphism and magmatism would all have to date strike-slip motion along the faults.…”

Section: 'Rigid Block' Modelsmentioning

confidence: 99%

Crustal–lithospheric structure and continental extrusion of Tibet

Searle

Elliott

Phillips

et al. 2011

JGS

240

154

View full text Add to dashboard Cite

Crustal shortening and thickening to c. 70-85 km in the Tibetan Plateau occurred both before and mainly after the c. 50 Ma India-Asia collision. Potassic-ultrapotassic shoshonitic and adakitic lavas erupted across the Qiangtang (c. 50-29 Ma) and Lhasa blocks (c. 30-10 Ma) indicate a hot mantle, thick crust and eclogitic root during that period. The progressive northward underthrusting of cold, Indian mantle lithosphere since collision shut off the source in the Lhasa block at c. 10 Ma. Late Miocene-Pleistocene shoshonitic volcanic rocks in northern Tibet require hot mantle. We review the major tectonic processes proposed for Tibet including 'rigid-block', continuum and crustal flow as well as the geological history of the major strikeslip faults. We examine controversies concerning the cumulative geological offsets and the discrepancies between geological, Quaternary and geodetic slip rates. Low present-day slip rates measured from global positioning system and InSAR along the Karakoram and Altyn Tagh Faults in addition to slow long-term geological rates can only account for limited eastward extrusion of Tibet since Mid-Miocene time. We conclude that despite being prominent geomorphological features sometimes with wide mylonite zones, the faults cut earlier formed metamorphic and igneous rocks and show limited offsets. Concentrated strain at the surface is dissipated deeper into wide ductile shear zones.

show abstract

Section: 'Rigid Block' Modelsmentioning

confidence: 99%

Crustal–lithospheric structure and continental extrusion of Tibet

Searle

Elliott

Phillips

et al. 2011

JGS

240

154

View full text Add to dashboard Cite

show abstract

“…The estimated peak P -T conditions in metamorphic rocks from the Cangshan Mountains area are 550 -570 °C and 5 -7 kbar (Leloup et al, 1993) and 540 -610 °C (Gillay et al, 2003) from Grt -St -Bt -Ms series schist, and 637 °C and 6.5 kbar from amphibolite (Cao et al, 2007). Eocene to Early Miocene ages, which are related to the sinistral shearing event, have been reported for some of these metamorphic rocks using various radiometric dating methods including 40 Ar/ 39 Ar (e.g., Leloup et al, 1993;Cao et al, 2011a), Th -Pb Mnz (Gilley et al, 2003), and SHRIMP and LA -ICP -MS U -Pb Zrn (Cao et al, 2011b;Searle et al, 2010) techniques.…”

Section: Geological Background Of the Study Areas Cangshan Mountainsmentioning

confidence: 98%

“…This area is regarded as a part of the northern extension of the Ailao Shan -Red River Shear Zone, which is considered to represent the boundary between the South China and Indochina cratons (e.g., Tapponnier et al, 1990). Mylonitized metamorphic rocks found in this shear zone exhibit structures which indicate left -lateral (sinistral) shearing, probably in relation to far -field collision of the Indian subcontinent with the Eurasian continent during the Eocene (e.g., Leloup et al, 1993). Furthermore, it has been suggested that the regional metamorphism in the Cangshan Mountains area was related to an earlier (Permo -Triassic) continental collision event involving the South China and Indochina cratons (e.g., Osanai et al, 2008;Searle et al, 2010).…”

Section: Geological Background Of the Study Areas Cangshan Mountainsmentioning

confidence: 99%

“…Eocene to Early Miocene ages, which are related to the sinistral shearing event, have been reported for some of these metamorphic rocks using various radiometric dating methods including 40 Ar/ 39 Ar (e.g., Leloup et al, 1993;Cao et al, 2011a), Th -Pb Mnz (Gilley et al, 2003), and SHRIMP and LA -ICP -MS U -Pb Zrn (Cao et al, 2011b;Searle et al, 2010) techniques. In addition, significantly older LA -ICP -MS U -Pb Zrn ages of 233 -243 Ma were determined 913T01E, 913T01J 914T01G 1206T01V, 1206T01AN 1207T01I, 1207T01L, 1207T01S, 1207T01AD, 1207T01AH C a n g s h a n M o u n ta in s Ailao Sha n -R ed R iv er She a r Z o ne 32602D, 32602F 815T01A, 815T01B 81501A2 816T01 32406A, 32406B, 324061, 32406D 81801C 32401A 32803C, 328T01C, 328T01D 901T01D 830T01A 830T03C, (1990a, 1990b), Leloup et al (1995), Tran Ngoc Nam et al (1998 and Lepvrier et al (2008).…”

Section: Geological Background Of the Study Areas Cangshan Mountainsmentioning

confidence: 99%

“…Gneisses are exposed along the eastern side of the mountain range, while schists are occur predominantly on the western side (e.g., Yunnan Bureau of Geology and Mineral Resources, 1990). The main lithologies present along the eastern side are Bt -Ms -Chl schist, Grt -Bt -Ms schist, and Ep -Hbl schist, whereas those on the western side are Grt -Sil -Bt gneiss, Grt -St -Bt -Ms gneiss, Grt -Cpx amphibolite, and amphibolite.The estimated peak P -T conditions in metamorphic rocks from the Cangshan Mountains area are 550 -570 °C and 5 -7 kbar (Leloup et al, 1993) and 540 -610 °C (Gillay et al, 2003) from Grt -St -Bt -Ms series schist, and 637 °C and 6.5 kbar from amphibolite (Cao et al, 2007). Eocene to Early Miocene ages, which are related to the sinistral shearing event, have been reported for some of these metamorphic rocks using various radiometric dating methods including Metamorphosed mafic rocks analyzed in the present study were collected from the southern part of the Cangshan Mountains (Fig.…”

mentioning

confidence: 98%

See 2 more Smart Citations

Petrology, geochemistry, and origin of metamorphosed mafic rocks of the Trans Vietnam Orogenic Belt, Southeast Asia

Yonemura

Osanai

Nakano

et al. 2013

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

The Trans Vietnam Orogenic Belt (TVOB) of Southeast Asia is thought to have formed by a continent -continent collision between the South China and Indochina cratons in Permian -Triassic times. Here we focus on the nature and origin of metamorphosed mafic rocks that are widely distributed throughout the TVOB, including rocks from the Cangshan Mountains (northern TVOB), the Red River Shear Zone and Song Ma Suture Zone (central TVOB), and the Kontum Massif (southern TVOB). Amphibolite facies metamorphosed mafic rocks are widely distributed throughout all of these areas, while granulite facies and eclogite facies metamorphosed mafic rocks occur only in the Kontum Massif and Song Ma Suture Zone, respectively. Major and trace element compositions of these TVOB metamorphosed mafic rocks indicate an overall tholeiitic affinity, but suggest a wide array of tectonic settings for the precursor mafic magmas, including volcanic -arc basalt (VAB), mid -ocean ridge basalt (MORB), and within -plate basalt (WPB). In addition, Fe -rich gabbro -derived mafic metamorphic rocks occur in the southern part of the TVOB (in the Kontum Massif). On the basis of the distributions of each type of mafic metamorphic rocks and their metamorphic grades, there were arc and oceanic crust between the South China Craton and the Indochina Craton.Keywords: Collision zone, Metamorphosed mafic rocks, Trans Vietnam Orogenic Belt, Indochina Craton, South China Craton INTRODUCTIONContinental -continent collision zones are characterized by a variety of crustal materials including metamorphic rocks, granitoids, and accretionary prisms, in which deciphering the metamorphic evolution and history of magma generation are critical in unraveling the continental collision process. By evaluating the tectonic settings of the igneous protoliths of metamorphic rocks caught up between two collided continents, or even metamorphic rocks of the collided continental fragments themselves, we can place important constraints on the processes involved in continental collision, and this technique works especially well for mafic metamorphic rocks. Such rocks are typically considered to be derived from igneous rock precursors (e.g., Bucher and Frey, 1994), and the original tectonic setting of the source magma and process of igneous rock formation (i.e., basaltic lava flow versus gabbroic intrusion) of these rocks is generally determined based on petrography, geochemistry, and geological relationships with other lithologies observed in the field (e.g., Pearce and Cann, 1973). Asian continent is considered to be a composite of a number of smaller aggregated microcontinents (Metcalfe, 1999), and in Southeast Asia alone, a total of five microcratons have been identified, including the South China craton, Indochina craton, Shan -Thai craton, Sibumasu craton, and West Burma craton. Metamorphic rocks related to the continental collisions in Southeast Asia are exposed along the boundaries or sutures between these microcontinents ( Fig. 1), and undoubtedly preserve important information p...

show abstract

Late Cenozoic tectonic evolution of the Ailao Shan-Red River fault (SE Tibet): Implications for kinematic change during plateau growth

et al. 2016

View full text Add to dashboard Cite

Surface uplift, river incision, shear zone exhumation, and displacement along active faults have all interacted to shape the modern landscape in the southeastern margin of the Tibetan Plateau. The Ailao Shan‐Red River fault, a major structure in the tectonic evolution of southeastern Asia, is an excellent recorder of these processes. We present new stratigraphic, structural, and low‐temperature thermochronologic data to explore its late Cenozoic tectonic and geomorphic evolution. The stratigraphic and structural observations indicate that the major bend in the fault was a releasing bend with significant Miocene sedimentation in the early–middle Miocene but became a restraining bend with abundant shortening structures developed after the late Miocene reversal of displacement. We also document exhumation of the shear zone from two low‐temperature thermochronologic transects. New apatite (U‐Th)/He(AHe) data and published thermochronologic results reveal two accelerated cooling episodes, backed by stratigraphic and geomorphic observations. The first rapid cooling phase occurred from ca. 27 to 17 Ma with removal of cover rocks and exhumation of the shear zone. The second accelerated cooling episode revealed by our AHe data commenced at 14–13 Ma, lasting 2–3 Myr. The Ailao Shan range may have risen to its modern elevation with high‐relief topography developing due to river incision. We interpret the onset of this rapid exhumation to reflect renewed plateau growth associated with lower crustal flow.

show abstract

High-temperature metamorphism in a major strike-slip shear zone: the Ailao Shan—Red River, People's Republic of China

Cited by 191 publications

References 28 publications

Crustal–lithospheric structure and continental extrusion of Tibet

Crustal–lithospheric structure and continental extrusion of Tibet

Petrology, geochemistry, and origin of metamorphosed mafic rocks of the Trans Vietnam Orogenic Belt, Southeast Asia

Late Cenozoic tectonic evolution of the Ailao Shan-Red River fault (SE Tibet): Implications for kinematic change during plateau growth

Contact Info

Product

Resources

About