Tertiary diachronic extrusion and deformation of western Indochina: Structural and <sup>40</sup>Ar/<sup>39</sup>Ar evidence from NW Thailand

Lacassin, Robin; Maluski, H.; Leloup, Philippe‐Hervé; Tapponnier, Paul; Hinthong, Chaiyan; Siribhakdi, Kanchit; Chuaviroj, Saengathit; Charoenravat, Adul

doi:10.1029/96jb03831

Cited by 223 publications

(222 citation statements)

References 53 publications

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“…Inferred suturing ages from Green et al (2008) and Gardiner et al (2015b). Mae Ping Fault movement ages from Lacassin et al (1997) and Palin et al (2013a). Epoch ages based on the International Chronostratigraphic Chart v 2014/02.…”

Section: Discussionmentioning

confidence: 99%

“…Transpressional thickening associated with movement on this fault, coupled with thickening at the restraining bend of the dextral Mae Yuan Fault, may be responsible for localized crustal thickening in the vicinity of Doi Inthanon. Geochronological studies dating movement along the Mae Ping Fault (also known as the Wang Chao Fault) imply Eocene-Oligocene shearing; Lacassin et al (1997) measured movement up to 30.5 Ma, while Palin et al (2013a) measured ages of 45-37 Ma, assumed as the age of metamorphism due to ductile shearing on the fault. These ages imply movement on the Mae Ping Fault occurred at a similar time to the late Eocene-Oligocene crustal thickening event at Doi Inthanon proposed here.…”

Section: The Mae Ping Faultmentioning

confidence: 99%

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Did Oligocene crustal thickening precede basin development in northern Thailand? A geochronological reassessment of Doi Inthanon and Doi Suthep

Gardiner

Morley

Searle

et al. 2016

Lithos

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The Doi Inthanon and Doi Suthep metamorphic core complexes in northern Thailand are comprised of amphibolite-grade migmatitic gneisses mantled by lower-grade mylonites and metasedimentary sequences, thought to represent Cordilleran-style core complexes exhumed through the mobilization of a low-angle detachment fault. Previous studies have interpreted two metamorphic events (Late Triassic and Late Cretaceous), followed by ductile extension between the late Eocene and late Oligocene, a model which infers movement on the detachment at ca. 40 Ma, and which culminates in a rapid unroofing of the complexes in the early Miocene. The Chiang Mai Basin, the largest such Cenozoic Basin in the region, lies immediately to the east. Its development is related to the extension observed at Doi Inthanon and Doi Suthep, however it is not definitively dated, and models for its development have difficulty reconciling Miocene cooling ages with Eocene detachment movement. Here we present new in-situ LA-ICP-MS and SIMS U-Pb age data of zircon and monazite grains from gneiss and leucogranite samples taken from Doi Inthanon and Doi Suthep. Our new zircon data exhibit an older age range of 221-210 Ma, with younger ages of ca. 72 Ma, and 32-26 Ma. Our monazite data imply an older age cluster at 83-67 Ma, and a younger age cluster of 34-24 Ma. While our data support the view of Indosinian basement being reworked in the Cretaceous, they also indicate a late Eocene-Oligocene tectonothermal event, resulting in prograde metamorphism and anatexis. We suggest that this later event is related to localized transpressional thickening associated with sinistral movement on the Mae Ping Fault, coupled with thickening at the restraining bend of the Mae Yuan Fault to the immediate west of Doi Inthanon. Further, this upper Oligocene age limit from our zircon and monazite data would imply a younger Miocene constraint on movement of the detachment, which, when combined with the previously recorded Miocene cooling ages, has implications for a model for the onset of extension and subsequent development of the Chiang Mai Basin in the early mid-Miocene.

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Section: Discussionmentioning

confidence: 99%

Section: The Mae Ping Faultmentioning

confidence: 99%

Did Oligocene crustal thickening precede basin development in northern Thailand? A geochronological reassessment of Doi Inthanon and Doi Suthep

Gardiner

Morley

Searle

et al. 2016

Lithos

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“…1. Topography, main active faults (thick and thin black lines) from Lacassin et al (1997), Burchfiel (2004), Simons et al (2007), Yin (2010). Black arrows denote motions of the Eurasian, Australian, Indian plates and the South China and Sundaland blocks in SE Asia and its vicinity, which are computed using the global plate kinematic model NNR-NUVEL-1A (DeMets et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements

et al. 2013

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We present a horizontal velocity field determined from a GPS network with 22 sites surveyed from 2001 to 2012 in northwestern Vietnam. The velocity is accurately estimated at each site by fitting a linear trend to each coordinate time series, after accounting for coseismic displacements caused by the 2004 Sumatra and the 2011 Tohoku earthquakes using static fault models. Considering the coseismic effects of the earthquakes, the motion of northwestern Vietnam is 34.3 ± 0.7 mm/yr at an azimuth of N108• ± 0.7• E in ITRF2008. This motion is close to, but slightly different from, that of the South China block. The area is in a transition zone between this block, the Sundaland block, and the Baoshan sub-block. At the local scale, a detailed estimation of the crustal deformation across major fault zones is geodetically revealed for the first time. We identify a locking depth of 15.3 ± 9.8 km with an accumulating left-lateral slip rate of 1.8 ± 0.3 mm/yr for the Dien Bien Phu fault, and a shallow locking depth with a right-lateral slip rate of 1.0 ± 0.6 mm/yr for the Son La and Da River faults.

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“…However, the age dating of the Mae Ping Fault zone at 29-31 Ma (Lacassin et al, 1997;Ahrendt et al 1993Ahrendt et al , 1994Ahrendt et al , 1997 may be the closest related events. The northward movement of the Australian-Indian plate and collision with the Eurasian plate, and the westward subduction of the Pacific plate, are suspected to be two major causes of the splitting and pushing of the northern Thailand segment southwestward along the Sakiang, Mae Ping and Red River Fault zones.…”

Section: Isotopic Analysismentioning

confidence: 99%

Paleaogeography and Climatic Change recorded on Viviparidae Carbon and Oxygen Isotope in Mae Moh Coal Mine, Northern Thailand

Ratanasthien

Takashima

Matsubaya

2009

Bull. Geol. Surv. Japan

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Viviparidae fossil collected from the R-, Q-, and K-coal zones of the Mae Moh coal mine, northern Thailand were analyzed for 13 Carbon and 18 Oxygen isotopes at Akita University, Japan. The result reveals that Viviparidae of the lower part of the coal mine contribute much heavier carbon isotopes than the upper part. The results revealed that Viviparidae shell O ‰ value between -6.64 to -7.04 ‰ PDB. The isotopic results of Viviparidae fossil shells from Mae Moh basin show the gradually change from the R-coal zone to the Q-, and the K-coal zone and significantly different from the Recent Viviparidae in the area. The heavy carbon isotopes in the R-coal zone could imply a much cooler climate than during the Q-and K-coal zone depositing period and the area were more close to the sea. The climatic condition during the Q-and K-coal zone depositing period was warmer and at a geographically higher elevation or latitude than during depositing the R-coal zone. The changing records in Mae Moh coal field are confirmed by temperate fossils in the other Oligocene to Lower Miocene basins in Northern Thailand. The change to a more tropical climate could have occurred during the Middle Miocene period, as indicated by paleomagnetic age dating in the K-and Q-coal zone. The northward movement of the Australian-Indian plate and collision with the Eurasian plate are suspected to be the main cause of the change.

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Tertiary diachronic extrusion and deformation of western Indochina: Structural and ⁴⁰Ar/³⁹Ar evidence from NW Thailand

Cited by 223 publications

References 53 publications

Did Oligocene crustal thickening precede basin development in northern Thailand? A geochronological reassessment of Doi Inthanon and Doi Suthep

Did Oligocene crustal thickening precede basin development in northern Thailand? A geochronological reassessment of Doi Inthanon and Doi Suthep

Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements

Paleaogeography and Climatic Change recorded on Viviparidae Carbon and Oxygen Isotope in Mae Moh Coal Mine, Northern Thailand

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Tertiary diachronic extrusion and deformation of western Indochina: Structural and 40Ar/39Ar evidence from NW Thailand

Cited by 223 publications

References 53 publications

Did Oligocene crustal thickening precede basin development in northern Thailand? A geochronological reassessment of Doi Inthanon and Doi Suthep

Did Oligocene crustal thickening precede basin development in northern Thailand? A geochronological reassessment of Doi Inthanon and Doi Suthep

Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements

Paleaogeography and Climatic Change recorded on Viviparidae Carbon and Oxygen Isotope in Mae Moh Coal Mine, Northern Thailand

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Tertiary diachronic extrusion and deformation of western Indochina: Structural and ⁴⁰Ar/³⁹Ar evidence from NW Thailand