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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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West Africa
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Chad (1)
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Asia
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Far East
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China
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Dabie Mountains (1)
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Liaoning China
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Liaodong Peninsula (1)
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North China Platform (1)
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Xizang China
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Lhasa Block (1)
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Yunnan China
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Taiwan
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Australasia
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Pacific Ocean
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elements, isotopes
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stable isotopes
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metals
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lead
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rare earths
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Primary terms
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absolute age (14)
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Africa
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Chad (1)
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Asia
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Far East
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China
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Dabie Mountains (1)
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Liaoning China
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Liaodong Peninsula (1)
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North China Platform (1)
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Xizang China
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Lhasa Block (1)
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Yunnan China
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Ailao Shan (2)
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Taiwan
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Chelungpu Fault (1)
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Taiwanese Central Range (1)
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Vietnam (3)
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Himalayas (1)
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Middle East
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Cyprus (2)
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Dead Sea Rift (2)
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Syria (3)
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Turkey
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East Anatolian Fault (1)
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Tibetan Plateau (2)
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Australasia
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tonalite (1)
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intrusions (2)
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isotopes
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Pb-208/Pb-204 (1)
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stable isotopes
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Mesozoic
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metals
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lead
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rare earths
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metamorphic rocks
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metamorphism (1)
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Pacific Ocean
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Precambrian
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upper Precambrian
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sedimentation (1)
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tectonics (10)
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rock formations
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Troodos Ophiolite (2)
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Extensional mountain building along convergent plate boundary: Insights from the active Taiwan mountain belt
Transition from extrusion to flow tectonism around the Eastern Himalaya syntaxis
Late Permian mafic rocks identified within the Doba basin of southern Chad and their relationship to the boundary of the Saharan Metacraton
Geochemistry and geochronology of the Troodos ophiolite: An SSZ ophiolite generated by subduction initiation and an extended episode of ridge subduction?
Reply to Discussion on ‘Geological offsets and age constraints along the northern Dead Sea fault, Syria': Journal , 167 , 1001–1008
Geological offsets and age constraints along the northern Dead Sea fault, Syria
Rapid exhumation and cooling of the Liaonan metamorphic core complex: Inferences from 40 Ar/ 39 Ar thermochronology and implications for Late Mesozoic extension in the eastern North China Craton
Timing of subduction zone metamorphism during the formation and emplacement of Troodos and Baer–Bassit ophiolites: insights from 40 Ar– 39 Ar geochronology
Formation and emplacement of the Northland ophiolite, northern New Zealand: SW Pacific tectonic implications
Petrologic case for Eocene slab breakoff during the Indo-Asian collision: Comment and Reply: COMMENT
Abstract The Mesozoic geology of SE China is characterized by intensive and widespread magmatism. However, the tectonic regime that accounted for the Mesozoic magmatism has been an issue with little consensus. A comprehensive study of 40 Ar– 39 Ar dating, geochemistry and Sr–Nd isotopes has been conducted on basalts from southern Hunan and syenite intrusions from eastern Guangxi. Three episodes of Jurassic magmatism, i.e. alkaline basalts of c .175 Ma in age, syenitic intrusions of c .160 Ma and high-Mg basalts of c .150 Ma, are identified. The older, c .175 Ma alkaline basalts are characterized by low Sr ( I Sr = 0.7035–0.7040) and high Nd ( ε Nd ( T ) = 5 to 6) isotopic compositions and OIB-like trace-element patterns (e.g. Nb/La > 1). In contrast, the younger, c .150 Ma high-Mg basalts have high Sr ( I Sr c .0.7054) and low Nd ( ε Nd ( T ) c .−2) isotopic compositions and incompatible trace-element patterns of arc affinity. The c .160 Ma syenitic intrusions display a relatively large range of Sr and Nd isotopic compositions ( I Sr = 0.7032–0.7082, ε Nd ( T ) = 5.5 to −4.1), with the Qinghu syenites having the lowest I Sr , highest ε Nd ( T ) and OIB-type incompatible trace-element patterns analogous to the c .175 Ma alkaline basalts. Such a secular variation in rock types and geochemical and isotopic characteristics reveals changes in melt segregation depth and mantle sources, which are inferred to have resulted from the post-Indosinian orogenic lithosphere extension and thinning. The c .175 Ma alkaline basalts are suggested to have formed by small degrees of decompression melting of the asthenosphere or an enriched lithospheric mantle source accreted by asthenosphere-derived melts during the initial extension. The c .160 Ma syenitic and c .150 Ma high-Mg basaltic rocks mainly originated from the enriched lithospheric mantle that melted owing to a raised geotherm caused by lithosphere thinning. This interpretation is at odds with the active continental margin related to the subduction of palaeo-Pacific plate, but consistent with continental rifting and extension for the Mesozoic of SE China.