Tectonics of the Central Asian Orogenic Belt and its Pacific analogues

Xiao, Wenjiao; Kusky, Timothy; Safonova, Inna; Seltmann, Reimar; Sun, Min

doi:10.1016/j.jseaes.2015.06.032

Cited by 47 publications

(14 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1A) and is known as one of the largest and longest-lived accretionary orogenic systems in the world (Şengör et al, 1993;Windley et al, 2007;W.J. Xiao et al, 2015aW.J.…”

Section: Geological Backgroundmentioning

confidence: 99%

Metamorphic evolution and geochronology of the tectonic mélange of the Dongbatu and Mogutai blocks, middle Dunhuang orogenic belt, northwestern China

Wang

Zhang

et al. 2018

Geosphere

View full text Add to dashboard Cite

Mafic granulite and amphibolite in the Dongbatu and Mogutai blocks, middle Dunhuang orogenic belt, northwest China, southernmost Central Asian orogenic belt, occur as lenses within the matrix of metapelite and marble, exhibiting typical block-in-matrix fabrics of tectonic mélange. Three stages of metamorphic mineral assemblages were identified in these lenses. Clockwise metamorphic pressure-temperature (P-T) paths were obtained through geothermobarometry and thermodynamic pseudosection modeling, passing from 656 °C and 10.9 kbar through 830 °C and 16.5 kbar to 657 °C and 4.9 kbar for the mafic granulite, and from 564-645 °C and 3.2-9.6 kbar through 634-727 °C and 6.1-14.2 kbar to 615-664 °C and 3.2-4.2 kbar for the amphibolites, respectively. Metamorphic peak P-T conditions in the metapelitic country rocks were estimated to be 635-675 °C and 6.0-6.9 kbar. The metamorphic peak of the mafic granulite approaches the high P-T facies series, indicative of a subduction zone. Secondary-ion mass spectrometry and laser ablationinductively coupled plasma-mass spectrometry U-Pb dating of metamorphic zircons suggests that the metamorphic event occurred between ca. 420 and 372 Ma. These data further certify that the subduction of the continental margin and subsequent uplift of the Dunhuang orogenic belt represent a longlived tectono-metamorphic event in the Paleozoic.

show abstract

“…1A) and is known as one of the largest and longest-lived accretionary orogenic systems in the world (Şengör et al, 1993;Windley et al, 2007;W.J. Xiao et al, 2015aW.J.…”

Section: Geological Backgroundmentioning

confidence: 99%

Metamorphic evolution and geochronology of the tectonic mélange of the Dongbatu and Mogutai blocks, middle Dunhuang orogenic belt, northwestern China

Wang

Zhang

et al. 2018

Geosphere

View full text Add to dashboard Cite

show abstract

“…The Central Asian Orogenic Belt (CAOB) is known as one of the largest accretionary orogenic systems in the world, formed via punctuated accretion and collision of multiple orogenic components, such as magmatic arc, seamount, (ophiolitic) mélange, and (Precambrian) micro-continent, during the Neoproterozoic to the Late Paleozoic (Khain et al, 2002;Sengör, Natal'in, & Burtman, 1993;Tian et al, 2013Tian et al, , 2015Wang, Kusky, et al, 2013;Windley, Alexeiev, Xiao, Kroner, & Badarch, 2007;Xiao et al, 2008;Xiao, Huang, Han, Sun, & Li, 2010;Xiao, Kusky, Safonova, Seltmann, & Sun, 2015;Xiao, Windley, et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Paleozoic subduction of the southern Dunhuang Orogenic Belt, northwest China: metamorphism and geochronology of the Shuixiakou area

et al. 2018

View full text Add to dashboard Cite

Amphibolites in the Shuixiakou area of the southern Dunhuang Orogenic Belt, southernmost Central Asian Orogenic Belt (CAOB), occur as lenses within hornblende-biotite-plagioclase gneiss or pelitic schist, exhibiting block-in-matrix feature of tectonic mélange. Three generations of metamorphic mineral assemblages (M1, M2, and M3) have been recognized in the garnetbearing amphibolite lenses. The metamorphic prograde assemblage (M1) is documented with inclusion trails (hornblende + plagioclase + quartz) within garnet porphyroblasts, and are estimated to be formed under 610-690 °C and 6.5-10.2 kbar. The metamorphic peak assemblage (M2) consists of garnet + hornblende + clinopyroxene + plagioclase + quartz in the matrix and records metamorphic peak P-T conditions of 720-750 °C and 13.4-14.7 kbar. The retrograde assemblage (M3) is represented by the symplectic assemblage (hornblende + plagioclase + quartz ± biotite ± magnetite) rimming the garnet porphyroblast, formed in the decompression stage under P-T conditions of 630-730 °C and 3.8-7.2 kbar. The derived metamorphic P-T paths show similar tight clockwise loops including nearly isothermal decompression processes, typical of orogenic metamorphism. SIMS dating of metamorphic zircons from the amphibolites confirm that the high-pressure metamorphism (M2) occurred at ca. 438-398 Ma.

show abstract

“…The tectonic evolution of Northeast China is characterized by the Mongol–Okhotsk Ocean (MOO) tectonic regime in the northwest and the Paleo–Pacific Ocean (PPO) subduction systems in the east, which occurred during the Mesozoic (J. Tang, Xu, Wang, Zhao, & Wang, ; W. Xu et al, ). The time of amalgamation of the micro‐continental blocks and the tectonic evolution has attracted much attention from both domestic and foreign scholars (Cawood et al, ; Y. Liu et al, ; Safonova & Santosh, ; She et al, ; W. Xiao, Kusky, Safonova, Seltmann, & Sun, ). Thus, the dynamic implications of the PAO, MOO, and PPO tectonic regimes on the central GXR is worth exploring.…”

Section: Introductionmentioning

confidence: 99%

“…time of amalgamation of the micro-continental blocks and the tectonic evolution has attracted much attention from both domestic and foreign scholars (Cawood et al, 2009;Y. Liu et al, 2017;Safonova & Santosh, 2014;She et al, 2012;W. Xiao, Kusky, Safonova, Seltmann, & Sun, 2015).…”

mentioning

confidence: 99%

Geochronology, petrogenesis, and tectonic setting of Late Triassic volcanic rocks of the Hadataolegai Formation, central Great Xing'an Range, Northeast China

et al. 2018

View full text Add to dashboard Cite

In this study, new geochemical, zircon U–Pb, and Lu–Hf isotopic data are presented for volcanics from the Hadataolegai Formation of the central Great Xing'an Range (GXR) in Northeast China. These new data offer insights into the petrogenesis of the volcanics of the Hadataolegai Formation and the tectonic evolution of the Paleo–Asian Ocean (PAO) and Mongol–Okhotsk Ocean (MOO). These volcanics of the Hadataolegai Formation are divided into andesite‐trachyandesites and dacite‐trachydacites. Zircon U–Pb ages show that the volcanics of the Hadataolegai Formation erupted between 230 Ma and 228 Ma during the Late Triassic, which agrees with recently obtained data. The volcanic rocks in this study have low Y (9.9–21.1 ppm) and Yb (0.78–2.02 ppm) contents, high Sr (444–954 ppm) contents, and slight Eu anomalies (δEu = 0.82 to 0.94), similar to ‘adakite‐like’ rocks. The dacites were formed by fractional crystallization of coeval andesitic magmas. The zircons within the andesite and trachyandesite yield higher positive εHf(t) values (+6.3 to +12.0) and model ages (TDM2) between 860 Ma and 453 Ma, which indicates that the magmas were generated by a newly accreted continental crustal source. Moreover, some of the volcanics are relatively high in MgO contents. These characteristics indicate that the volcanic magmas were derived from the partial melting of delaminated lower crust and mixing with mantle materials. Combining these data with previous studies, we suggest that the magmatism in the central GXR was governed by extension due to the closure of the PAO and the back‐arc extension associated with the southward subduction of the MOO plate (western GXR, near the Erguna Block).

show abstract

Tectonics of the Central Asian Orogenic Belt and its Pacific analogues

Cited by 47 publications

References 43 publications

Metamorphic evolution and geochronology of the tectonic mélange of the Dongbatu and Mogutai blocks, middle Dunhuang orogenic belt, northwestern China

Metamorphic evolution and geochronology of the tectonic mélange of the Dongbatu and Mogutai blocks, middle Dunhuang orogenic belt, northwestern China

Paleozoic subduction of the southern Dunhuang Orogenic Belt, northwest China: metamorphism and geochronology of the Shuixiakou area

Geochronology, petrogenesis, and tectonic setting of Late Triassic volcanic rocks of the Hadataolegai Formation, central Great Xing'an Range, Northeast China

Contact Info

Product

Resources

About