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Middle–Late Triassic southward-younging granitoids: Tectonic transition from subduction to collision in the Eastern Tianshan–Beishan Orogen, NW China
Boninitic blueschists record subduction initiation and subsequent accretion of an arc–forearc in the northeast Proto-Tethys Ocean
Two key switches in regional stress field during multi-stage deformation in the Carboniferous–Triassic southernmost Altaids (Beishan, NW China): Response to orocline-related roll-back processes
Three stages of arc migration in the Carboniferous-Triassic in northern Qiangtang, central Tibet, China: Ridge subduction and asynchronous slab rollback of the Jinsha Paleotethys
From Ordovician nascent to early Permian mature arc in the southern Altaids: Insights from the Kalatage inlier in the Eastern Tianshan, NW China
Provenance and tectonic setting of late Paleozoic sedimentary rocks from the Alxa Tectonic Belt (NW China): Implications for accretionary tectonics of the southern Central Asian Orogenic Belt
Carboniferous to Early Triassic magmatism and accretion in Alxa (NW China): implications for accretionary orogenesis of the southern Altaids
A mid-Palaeozoic ocean–continent transition in the Mazongshan subduction–accretion complex, Beishan, NW China: new structural, chemical and age data constrain the petrogenesis and tectonic evolution
Structural anatomy of the early Paleozoic Laohushan ophiolite and subduction complex: Implications for accretionary tectonics of the Proto-Tethyan North Qilian orogenic belt, northeastern Tibet
Indo-Burma passive amalgamation along the Kaladan Fault: Insights from zircon provenance in the Chittagong-Tripura Fold Belt (Bangladesh)
Early Permian subduction-related transtension in the Turpan Basin, East Tianshan (NW China): implications for accretionary tectonics of the southern Altaids
Rifting of the northern margin of the Indian craton in the Early Cretaceous: Insight from the Aulis Trachyte of the Lesser Himalaya (Nepal)
Abstract The geologic framework of China is dominated by three major Precambrian continental blocks (North China, South China, and Tarim) and their surrounding orogenic belts. The Phanerozoic tectonics of China are represented by three orogenic systems that formed via amalgamation of these blocks and subduction/accretion along most of their margins. These orogenic systems include the Early Cambrian to early Mesozoic Altaids in the north, the Early Cambrian to Cenozoic Tethysides in the south, and the Mesozoic to present Nipponides in the east. The Altaids in northern Xinjiang, Beishan, Alxa, Inner Mongolia, and northeastern China comprises a huge orogenic collage of the Central Asian orogenic belt. The Altaids formed by substantial Phanerozoic continental growth by ocean closure and terrane accretion in the Permian-Triassic until its termination by collision with the Tarim and North China blocks in the Permo-Triassic. Southward subduction of the Mongol-Okhotsk oceanic plate beneath the North China block led to widespread magmatism and deformation in the Mesozoic. The Tethysides that occupy most of the area south of the Tarim and North China blocks acted as a major bulwark against the collision of several continental blocks, including the South China block. The western Tethysides in China is occupied by the Kunlun-Altyn-Qilian and Himalaya-Tibetan orogens that record a long amalgamation history involving the evolution of the Proto-, Paleo-, and Neo-Tethys Oceans. The Tethys Ocean was finally terminated by collision between the Indian continent and the southern margin of the Eurasian continent, giving rise to the bulk of the Tibetan Plateau. The development of the eastern Tethysides in China was dominated by Triassic amalgamation between the South China and North China blocks, which gave rise to the Qinling-Dabie-Sulu orogens, and coeval collisions with microcontinental blocks such as the Indochina block in the southeastern Tibetan Plateau. The evolution of the Nipponides started in the late Paleozoic to Triassic along the eastern margin of the Chinese mainland as a result of subduction of the Paleo-Pacific Ocean. The development of the Nipponides in the Jurassic led to extension of the Altaids in northeastern China and deformation along complicated compressional and strike-slip structures in the eastern North China block. This was followed by delamination of the lower crust of the eastern half of the North China block in the Early Cretaceous. The latest development of the Nipponides in the past few million years led to formation of marginal seas and back-arc basins off coastal China, and to recent continent-arc collision in Taiwan Island. The early Paleozoic history of China was dominated by separation of the Tarim, North China, and South China blocks from Gondwanaland and their drift across the Panthalassic Ocean. The Tarim-Alxa-North China-South China backbone that formed in the Permian-Triassic played an important role in the construction of China. According to the temporal-spatial history of the Tarim-Alxa-North China-South China block and its surrounding orogens, we postulate that most of the Paleo-Asian Ocean originally belonged to, or was part of, the Paleo-Pacific (Panthalassic) Ocean. Therefore, only two major oceanic plates were responsible for the construction of the Chinese landmass in the Phanerozoic, i.e., the Pacific (Panthalassic) and the Tethys. The Pacific Ocean encompassed a major long-lived, external ocean, and the Tethys Ocean was an internal ocean within Pangea.
Mineralization of an intra-oceanic arc in an accretionary orogen: Insights from the Early Silurian Honghai volcanogenic massive sulfide Cu-Zn deposit and associated adakites of the Eastern Tianshan (NW China)
Onset of aridification by 34 Ma across the Eocene-Oligocene transition in Central Asia
Abstract New high spatial resolution secondary ion mass spectrometry (SIMS) U–Pb zircon data from the Sadh gneiss complex and the intruding Marbat granodiorite of the Marbat region, southern Sultanate of Oman, yield Cryogenian magmatic protolith ages for gneisses ranging from c. 850 to 830 Ma. Zircon ages record a c. 815–820 Ma period of deformation and migmatization, followed by intrusion of a hornblende gabbro/diorite and the undeformed Marbat granodiorite at c. 795 Ma. Following break-up and rifting of Rodinia at c. 870 Ma, crustal growth in the Marbat region occurred via arc accretion at c. 850–790 Ma, possibly in the easternmost part of the Mozambique Ocean based on earlier cessation of accretion here compared to the Arabian–Nubian Shield. Similarity of the new zircon geochronology to peaks of detrital zircon ages in the unconformably overlying Ediacaran Marbat sandstone suggests relatively local derivation from uplifted basement for the latter. Supplementary material: Detailed petrographic descriptions and photographs of hand specimens and thin-sections are available at http://www.geolsoc.org.uk/SUP18685 .