Ophiolite in Southeast Asia

Hutchison, Charles S.

doi:10.1130/0016-7606(1975)86<797:oisa>2.0.co;2

Cited by 284 publications

(126 citation statements)

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“…Schematic reconstructions 329 cannot be linked to numerical models of convection as they usually lack the continuous network of 330 plate boundaries through time that enables the use of plate velocities as surface boundary 331 conditions. As plate motions are inextricably linked to mantle convection (Hager and O'Connell,332 1981; Turcotte and Oxburgh, 1972), and since much of the Tethyan seafloor spreading history has 333 since been subducted (Hutchison, 1975;Şengör et al, 1988), some authors have inferred plate 334 motion histories from high velocity seismic anomalies as given by mantle tomography models ( Wu et al, 2016). We expand on these approaches and make use of our most recent plate 337 reconstructions coupled to numerical models of mantle convection that are validated using seismic 338 tomographic images and a suite of onshore and offshore geological constraints.…”

Section: Explained the Geological Affinities Between 242mentioning

confidence: 99%

Tectonic evolution and deep mantle structure of the eastern Tethys since the latest Jurassic

Zahirovic

Matthews

Flament

et al. 2016

Earth-Science Reviews

182

225

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The breakup of Pangea in the Jurassic saw the opening of major ocean basins at the expense of older Tethyan and Pacific oceanic plates. Although the Tethyan seafloor spreading history has been lost to subduction, proxy indicators from multiple generations of Tethyan ribbon terranes, as well as the active margin geological histories of volcanism and ophiolite obduction events can be used to reconstruct these ancient oceanic plates. The plate reconstructions presented in this study reconcile observations from ocean basins and the onshore geological record to provide a regional synthesis, embedded in a global plate motion model, of the IndiaEurasia convergence history, the accretionary growth of Southeast Asia and the Tethyan-Pacific tectonic link through the New Guinea margin. The global plate motion model presented in this study captures the timedependent evolution of plates and their tectonic boundaries since 160 Ma, which are assimilated as surface boundary conditions for numerical experiments of mantle convection. We evaluate subducted slab locations and geometries predicted by forward mantle flow models against P-and S-wave seismic tomography models. This approach harnesses modern plate reconstruction techniques, mantle convection models with imposed one-sided subduction, and constraints from the surface geology to address a number of unresolved Tethyan geodynamic controversies. Our synthesis reveals that north-dipping subduction beneath Eurasia in the latest Jurassic consumed the Meso-Tethys, and suggests that northward slab pull opened the younger Neo-Tethyan ocean basin from ~ 155 Ma. We model the rifting of ' Argoland', representing the East Java and West Sulawesi continental fragments, as a northward transfer of continental terranes in the latest Jurassic from the northwest Australian shelf -likely colliding first with parts of the Woyla intra-oceanic arc in the mid-Cretaceous, and accreting to the Borneo (Sundaland) core by ~ 80 Ma. The Neo-Tethyan ridge was likely consumed along an intra-oceanic subduction zone south of Eurasia from ~ 105 Ma, leading to a major change in the motion of the Indian Plate by ~ 100 Ma, as observed in the Wharton Basin fracture zone bends. We investigate the geodynamic consequences of long-lived intra-oceanic subduction within the Neo-Tethys, requiring a twostage India-Eurasia collision involving first contact between Greater India and the Kohistan-Ladakh Arc sometime between ~ 60 and 50 Ma, followed by continent-continent collision from ~ 47 Ma. Our models suggest that the Sunda slab kink beneath northwest Sumatra in the mantle transition zone results from the rotation and extrusion of Indochina from ~ 30 Ma. Our results are also the first to reproduce the enigmatic Proto South China Sea slab beneath northern Borneo, as well as the Tethyan/Woyla slab that is predicted at mid-mantle depths south of Sumatra. Further east, our revised reconstructions of the New Guinea margin, notably the evolution of the Sepik composite terrane and the Maramuni subduction zone, produce...

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Section: Explained the Geological Affinities Between 242mentioning

confidence: 99%

Tectonic evolution and deep mantle structure of the eastern Tethys since the latest Jurassic

Zahirovic

Matthews

Flament

et al. 2016

Earth-Science Reviews

182

225

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“…These belts delineate the Palaeo-Tethys suture in Malaysia, Thailand, and Myanmar (Fig. 2a: Barr and Macdonald, 1991, Hutchison, 1975, Hutchison, 1973, Metcalfe, 2002, Metcalfe, 2000and Mitchell, 1977. Within the Malay Peninsula, the Main Range Province outcrops as a single contiguous belt of undeformed granites.…”

Section: Geological Framework 21 Chiang Mai-lincang Beltmentioning

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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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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“…These are correlated to the Crocker Formation and the Trusmadi Formation of the Rajang Group (Kasama et al, 1970;Jacobson, 1970;Tokuyama and Yoshida, 1974). Ultramafic rocks were recognized in the Darvel Bay ophiolite (Hutchison, 1975(Hutchison, , 1978, and are considered to be a part of oceanic lithosphere obducted onto the Borneo microcontinent (McManus and Tate, 1986). Some of the peridotites in Sabah, such as garnet lherzolite near Ranau, are concluded to have been derived from the upper mantle beneath the Kalimantan micro-continent (Imai and Ozawa, 1991).…”

Section: Geological Backgroundmentioning

confidence: 99%

Genesis of the Mamut Porphyry Copper Deposit, Sabah, East Malaysia

Imai¹

2000

Resource Geology

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: The Mamut deposit of Sabah, East Malaysia, is a porphyry type Cu‐Au deposit genetically related to a quartz monzonite (“adamellite”) porphyry stock associated with upper Miocene Mount Kinabalu plutonism. The genesis of the Mamut deposit is discussed based on petrology of the intrusives in the Mount Kinabalu area combined with ore– and alteration–petrography, fluid inclusion and sulfur isotope studies. Groundmass of the adamellite porphyry at Mamut is rich in K which suggests vapor transport of alkaline elements during the mineralizing magmatic process, while the groundmass of the post‐ore “granodiorite” porphyry at Mamut contains small amounts of normative corundum suggesting depletion in alkaline elements at the root zone of the magma column. Sub‐dendritic tremolitic amphibole rims on hornblende phenocrysts in the Mamut adamellite porphyry suggest interaction between the mineralizing magma and the exsolved fluids. Occurrences of clinopyroxene microphenocrysts and pseudomor‐phic aggregates of shredded biotite and clinopyroxene after hornblende phenocrysts in the barren intrusives imply lower water fugacity and decreasing in water fugacity, respectively. Compositional gap between the core of hornblende phenocrysts and the tremolitic amphibole rims and those in the groundmass of the Mamut adamellite porphyry suggests a decrease in pressure. Higher XMg (=Mg/(Mg+Fe) atomic ratio) in the tremolitic amphibole rims in the Mamut adamellite porphyry compared to those of the barren intrusions suggests high oxygen fugacity. High halogen contents of igneous hydrous minerals such as amphiboles, biotite and apatite in the Mamut adamellite porphyry suggest the existence of highly saline fluids during the intrusion and solidification of the mineralizing magma. Fluid inclusions found in quartz veinlet stockworks are characterized by abundant hypersaline polyphase inclusions associated with subordinate amounts of immiscible gaseous vapor. Both Cu and Au are dispersed in disseminated and quartz stockwork ores. Chalcopyrite and pyrrhotite as well as magnetite are the principal ore minerals in the biotitized disseminated ores. Primary assemblage of intermediate solid solution (iss) and pyrrhotite converted to the present assemblage of chalcopyrite and pyrrhotite during cooling. Subsequent to biotitization, quartz veinlet stockworks formed associated with retrograde chlorite alteration. The Cu‐Fe sul–fides associated with stockwork quartz veinlet are chalcopyrite and pyrite. Overlapping Pb and Zn and subsequent Sb mineralizations were spatially controlled by NNE‐trending fractures accompanying the phyllic and advanced argillic alteration envelope. Sulfur isotopic composition of ore sulfides are homogeneous (about +2%) throughout the mineralization stages. These are identical to those of the magmatic sulfides of Mount Kinabalu adamellitic rocks.

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Ophiolite in Southeast Asia

Cited by 284 publications

References 0 publications

Tectonic evolution and deep mantle structure of the eastern Tethys since the latest Jurassic

Tectonic evolution and deep mantle structure of the eastern Tethys since the latest Jurassic

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

Genesis of the Mamut Porphyry Copper Deposit, Sabah, East Malaysia

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